CN102608145A - Nuclear magnetic resonance analyzer and slide table thereof - Google Patents
Nuclear magnetic resonance analyzer and slide table thereof Download PDFInfo
- Publication number
- CN102608145A CN102608145A CN2012100672512A CN201210067251A CN102608145A CN 102608145 A CN102608145 A CN 102608145A CN 2012100672512 A CN2012100672512 A CN 2012100672512A CN 201210067251 A CN201210067251 A CN 201210067251A CN 102608145 A CN102608145 A CN 102608145A
- Authority
- CN
- China
- Prior art keywords
- signal
- transistor
- antenna
- magnetic
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a nuclear magnetic resonance analyzer and a slide table thereof. The slide table comprises a main frame, a sample support and a driving mechanism, the main frame is provided with a non-magnetic platform, a magnet box of the nuclear magnetic resonance analyzer is placed on the non-magnetic platform, the sample support is fixedly connected onto the non-magnetic platform, a detected sample is placed on the sample support, and the driving mechanism is arranged on the main frame, is connected with the magnet box of the nuclear magnetic resonance analyzer, and is used for driving the magnet box of the nuclear magnetic resonance analyzer to move so as to change the position of the magnet box of the nuclear magnetic resonance analyzer relative to the detected sample. By the aid of the slide table of the nuclear magnetic resonance analyzer, phase positions of a magnet in the nuclear magnetic resonance analyzer and the detected sample can be changed, so that different portions of the sample to be detected is placed in a uniform magnetic field, nuclear magnetic resonance measurement to different portions of the sample to be detected is realized, the size of the sample to be detected is not limited, and the dimension range of detected samples which are in nuclear magnetic resonance measurement is expanded.
Description
Technical field
The present invention relates to the Nuclear Magnetic Resonance Measurement technology, particularly a kind of magnetic nuclear resonance analyzer slide unit and magnetic nuclear resonance analyzer.
Background technology
Magnetic nuclear resonance analyzer is to utilize nuclear magnetic resonance principle that sample is carried out a kind of instrument of nuclear magnetic resonance experiment, realizes the detection to sample interior structure and macroscopic property through the parsing to experimental data.
At present, existing magnetic nuclear resonance analyzer mainly comprises magnet, antenna, governor circuit, electronic circuit and host computer etc., and magnet is used to produce the required static magnetic field of nuclear magnetic resonance; Governor circuit is used for various parameters according to the host computer setting and generates and transmit, and sends antenna to after handling transmitting through electronic circuit, produces the radio-frequency field that makes the sample nuclear magnetic resonance with active antenna; Electronic circuit also can be handled to send governor circuit to the echoed signal of the sample of antenna collection; Governor circuit converts this echoed signal to digital signal, and obtains the amplitude and the phase information of echo; Host computer is resolved the amplitude and the phase information of the echoed signal that governor circuit transmits, to obtain information about fluids and the hole information etc. in the sample.
When sample is carried out Nuclear Magnetic Resonance Measurement; Need sample is positioned in the static magnetic field of magnet generation, in the existing magnetic nuclear resonance analyzer, the static magnetic field that magnet produces is in the certain space scope; And the size of sample can not surpass the spatial dimension that magnet produces static magnetic field; Thereby the size of sample is length particularly, is very limited.
Summary of the invention
The invention provides a kind of magnetic nuclear resonance analyzer slide unit and magnetic nuclear resonance analyzer, carry out the size of the sample of Nuclear Magnetic Resonance Measurement with expansion.
Magnetic nuclear resonance analyzer slide unit provided by the invention comprises:
Main frame, said main frame are provided with no magnetic recording level platform, the magnet housings that said no magnetic recording level platform is used to place magnetic nuclear resonance analyzer;
Sample holder is fixedly connected on the said no magnetic recording level platform, and said sample holder is used to place sample;
Driving mechanism; Be arranged on the said main frame; Said driving mechanism links to each other with the magnet housings of magnetic nuclear resonance analyzer, and said driving mechanism is used to drive the moving with the magnet housings that changes magnetic nuclear resonance analyzer and the relative position of sample of magnet housings of said magnetic nuclear resonance analyzer.
Another aspect of the present invention has provided a kind of magnetic nuclear resonance analyzer, comprises glass reinforced plastic pipe, magnet and antenna, also comprises the slide unit that the embodiment of the invention provides;
Wherein, said antenna is wound in the glass reinforced plastic pipe outside surface, and said antenna fixedly installs with respect to said magnet, and the magnetic field that places said magnet to produce;
Said antenna, glass reinforced plastic pipe and magnet all are arranged in the magnet housings, and said magnet housings is positioned on the no magnetic recording level platform of said slide unit, and sample passes said glass reinforced plastic pipe and is positioned on the said sample holder.
Magnetic nuclear resonance analyzer slide unit provided by the invention, the magnet housings of magnetic nuclear resonance analyzer can be positioned on the no magnetic recording level platform, and sample can be positioned on the sample holder; And be provided with driving mechanism, through the phase position that can change magnet housings and sample that moves of driving mechanism drive magnet housings, when magnet housings moves on main frame; The phase position of magnet housings and sample will change; And magnet is arranged in the magnet housings, and just the phase position of magnet and sample changes, and then; The uniform magnetic field that magnet produces and the relative position of sample also just change; Can make the different parts of testing sample place uniform magnetic field, the different piece of testing sample is carried out Nuclear Magnetic Resonance Measurement, thereby; The size of testing sample is unrestricted, has enlarged the size of carrying out the sample of Nuclear Magnetic Resonance Measurement.
Description of drawings
Fig. 1 is the structural representation of the magnetic nuclear resonance analyzer slide unit that the embodiment of the invention provided;
Fig. 2 is the structural representation of the magnetic nuclear resonance analyzer slide unit that another embodiment of the present invention provided;
Fig. 3 is the structural representation of the magnetic nuclear resonance analyzer that the embodiment of the invention provided;
Fig. 4 is the structural representation of the magnetic nuclear resonance analyzer that another embodiment of the present invention provided;
Fig. 5 is the structural representation of antenna tuning circuit in the magnetic nuclear resonance analyzer that the embodiment of the invention provided;
Fig. 6 is the structural representation of Q change-over circuit in the magnetic nuclear resonance analyzer that the embodiment of the invention provided and buffer circuit.
Embodiment
Magnetic nuclear resonance analyzer is to utilize nuclear magnetic resonance principle that sample is carried out the instrument of nuclear magnetic resonance experiment, and magnetic nuclear resonance analyzer mainly comprises magnet, antenna, governor circuit, electronic circuit and host computer etc.
The embodiment of the invention provides a kind of magnetic nuclear resonance analyzer slide unit; When utilizing magnetic nuclear resonance analyzer to carry out nuclear magnetic resonance experiment; Can magnetic nuclear resonance analyzer and sample be positioned over respectively on this slide unit; And the magnetic field that makes sample place the magnetic nuclear resonance analyzer magnet to produce is to carry out nuclear magnetic resonance experiment.
Fig. 1 is the structural representation of the magnetic nuclear resonance analyzer slide unit that the embodiment of the invention provided, and as shown in Figure 1, this slide unit comprises main frame 1, sample holder 2 and driving mechanism 3.
Main frame is the support frame of whole slide unit, can adopt multiple material, for example, and wood materials; Metal material such as copper, aluminium alloy, the version of main frame also has multiple, can be the structure of desk formula for shown in 1 figure; Comprise a plurality of supporting legs, a horizontal table top is set on a plurality of supporting legs, this horizontal table top promptly can be used as no magnetic recording level platform; No magnetic recording level platform adopts the unmagnetized material, for example, and timber, aluminium alloy etc.Certainly, main frame also can be other structure, is not limited to shown in Figure 1.
The magnet of magnetic nuclear resonance analyzer can be positioned in the magnet housings, and so that magnet is protected, and magnet housings can play the magnetic field that the shielding magnet produces, and avoids magnetic field is produced the effect of disturbing.Main frame is provided with no magnetic recording level platform, can no magnetic recording level platform be fixedly connected with main frame, and no magnetic recording level platform can be used for placing the magnet housings of magnetic nuclear resonance analyzer.
Sample holder is fixedly connected on the no magnetic recording level platform, and sample holder is used to place sample, can be multiple version; Concrete structure can be per sample concrete shaped design, as shown in Figure 1, testing sample is cylindrical; Sample holder can be the bracing frame of H type, and the magnet of NMR is positioned in the magnet housings, and the uniform magnetic field that magnet produces will be positioned at magnet housings; When testing sample is measured; Can make testing sample pass magnet housings, place the uniform magnetic field of magnet generation, and the two ends of cylindrical testing sample are positioned on the crossbeam of H type bracing frame with measure portion with testing sample.Certainly, if the sample holder that can design other structures is not limited to structure shown in Figure 1 to place testing sample.
Driving mechanism is arranged on the main frame, and driving mechanism links to each other with the magnet housings of magnetic nuclear resonance analyzer, is used for the magnet casing and moves, to change the relative position of magnet housings and sample.
Driving mechanism can be the structure of being made up of motor and belt etc.; Magnet housings is linked to each other with belt or is positioned on the belt; Rotation through machine shaft drives belt and rotates, thus the position that drives magnet housings move, to change the phase position of magnet housings and sample; Driving mechanism also can be the structure of being made up of hydraulic mechanism, catch bar etc.; Magnet housings is linked to each other with catch bar; Moved by hydraulic mechanism control catch bar, to change the phase position of magnet housings and sample, present embodiment is just enumerated the form of several kinds of driving mechanisms; Driving mechanism can have multiple version, is not limited to shown in the present embodiment.
Can be known that by technique scheme the magnet housings of magnetic nuclear resonance analyzer can be positioned on the no magnetic recording level platform, sample can be positioned on the sample holder; And be provided with driving mechanism, through the phase position that can change magnet housings and sample that moves of driving mechanism drive magnet housings, when magnet housings moves on main frame; The phase position of magnet housings and sample will change, and magnet is arranged in the magnet housings, and just the phase position of magnet and sample changes; And then the uniform magnetic field that magnet produces and the relative position of sample also just change, and can make the different parts of testing sample place uniform magnetic field; Different piece to testing sample is carried out Nuclear Magnetic Resonance Measurement; Thereby the size of testing sample is unrestricted, has enlarged the size of carrying out the sample of Nuclear Magnetic Resonance Measurement.
Fig. 2 is the structural representation of the magnetic nuclear resonance analyzer slide unit that another embodiment of the present invention provided; On the basis of the foregoing description; Further; As shown in Figure 2, the driving mechanism 3 of this magnetic nuclear resonance analyzer slide unit comprises first belt pulley, second belt pulley, motor driver 301 and stepper motor 302.
First belt pulley and the second belt pulley (not shown) are arranged at respectively on the no magnetic recording level platform 101; Be provided with travelling belt 303 between first belt pulley and second belt pulley; Travelling belt 303 links to each other with the magnet housings 20 of magnetic nuclear resonance analyzer, and the magnet housings 20 of NMR is slidingly connected with no magnetic recording level platform 101.
Can through be spirally connected, mode such as riveted joint is fixedly connected first belt pulley and is arranged on the no magnetic recording level platform with second belt pulley; Between first belt pulley and second belt pulley, travelling belt is set; Travelling belt is linked to each other with the magnet housings of magnetic nuclear resonance analyzer, and magnet housings is slidingly connected with no magnetic recording level platform; When travelling belt rotates, can drive magnet housings and on no magnetic recording level platform, slide.
The rotating shaft 312 of stepper motor 302 links to each other with second belt pulley; The rotating shaft 312 of stepper motor 302 is rotated set angle according to control wave; Drive travelling belt 303 rotations to drive second belt pulley, thereby the magnet housings 100 that drives magnetic nuclear resonance analyzer is slided on no magnetic recording level platform 11.
Stepper motor is the motor that electric impulse signal is changed into angular displacement or displacement of the lines; The frequency and the umber of pulse of pulse signal depended in the rotating speed of stepper motor, the position that stops; Motor driver is used for generating to the Stepping Motor Control pulse signal; Rotating shaft with drive stepping motor is rotated, and pulse signal of the every generation of motor driver rotates (forward or reverse) fixing angle with regard to drive stepping motor by the direction of setting; This angle is also claimed stepping angle, and the rotation of stepper motor is to move step by step with fixing angle.Can come the pilot angle displacement through the number of control wave, can come the speed and the acceleration of the rotation of control step motor through the frequency of control wave simultaneously, thereby reach the purpose of accurate location and speed governing.
In the present embodiment, the rotating shaft of stepper motor is linked to each other with second belt pulley, thereby stepper motor drives the rotation of second belt pulley down in motor driver control; Second belt pulley is as driving wheel; First belt pulley rotates the drive travelling belt through second belt pulley and rotates along first belt pulley and second belt pulley as engaged wheel, and then; Drive magnet housings through travelling belt and on no magnetic recording level platform, slide, change the relative position of magnet housings and sample.
Driving mechanism in the present embodiment adopts the Drive Structure of stepper motor and travelling belt; Shift position through the step motor control magnet housings; Has the repeatability of positional precision and motion preferably; Therefore, the accurate in locating sample places magnet to produce the position in magnetic field more, improves the precision of measuring.
And as shown in Figure 2, sample holder 2 comprises that two are H type support in this slide unit; The two H type supports predeterminable range of being separated by is arranged at respectively on the no magnetic recording level platform 101; Wherein, each H type support comprises that a horizontal gird 201 and two vertical support bar 202, two vertical support bar 202 bottoms are fixed in respectively on the no magnetic recording level platform 101; Horizontal gird 201 two ends are fixed in respectively on each vertical support bar 202, and sample 20 is set up on the horizontal gird 201 of two H type supports.
Further, the main frame 1 of this slide unit can adopt structure as shown in Figure 2, and main frame 1 comprises at least one supporting leg 102, and no magnetic recording level platform 101 is fixed on the supporting leg 102; Supporting leg 102 bottoms are provided with horizontal panel 103, and horizontal panel 103 is used for placing magnetic nuclear resonance analyzer host computer 22, governor circuit 23 and electronic processing circuit 24; Motor driver 301 is fixed on the bottom wall of no magnetic recording level platform 101.
The foregoing description is just enumerated a kind of slide unit structure of magnetic nuclear resonance analyzer of form, and in practical application, art technology can be done corresponding variation to above-mentioned structure, is not limited to the structure of the foregoing description.
The embodiment of the invention also provides a kind of magnetic nuclear resonance analyzer; This analyser comprises glass reinforced plastic pipe, magnet and antenna; Also comprise the slide unit that the embodiment of the invention provides, wherein, said antenna is wound in the glass reinforced plastic pipe outside surface; Said antenna fixedly installs with respect to said magnet, and the magnetic field that places said magnet to produce; Said antenna, glass reinforced plastic pipe and magnet all are arranged in the magnet housings, and said magnet housings is positioned on the no magnetic recording level platform of said slide unit, and sample passes said glass reinforced plastic pipe and is positioned on the sample holder.
Magnetic nuclear resonance analyzer is the instrument that utilizes nmr phenomena that sample is measured, and at first nmr phenomena is carried out brief account below.
Nuclear magnetic resonance is meant that energy level transition takes place atomic nucleus, is transitted to the physical phenomenon of high-energy state by low-energy state under another externally-applied magnetic field effect.
Not all atomic nucleus can both produce this phenomenon, has only magnetic core could produce nmr phenomena, and mass number and proton number are the atomic nucleus of even number, and spin quantum number is 0, and this nucleid phenomenon that do not spin is called non-magnetic atom nuclear.Mass number is the atomic nucleus of odd number, and spin quantum number is a half-integer, and its spin quantum number is not 0, is called magnetic atom nuclear.Mass number is an even number, and proton number is the atomic nucleus of odd number, and spin quantum number is an integer, and such nuclear also is magnetic atom nuclear.
When the magnetic atom nuclear spin; Can produce a magnetic moment because of spin; When this atomic nucleus is adding the electromagnetic wave that can absorb CF after the energy that receives other sources in the static magnetic field is imported, produce energy level transition from lower energy level transition to higher energy level, this process is exactly a nuclear magnetic resonance; When nuclear magnetic resonance took place, the angle of nuclear moments and externally-applied magnetic field can change.
The frequency that makes atomic nucleus generation energy level transition is by the intensity of externally-applied magnetic field and the character decision of atomic nucleus itself; That is to say, for a certain specific atoms, in the externally-applied magnetic field of certain intensity; The frequency of its atomic nucleus precession is changeless, and this frequency is called as Larmor frequency.
In order to let atomic nucleus generation energy level transition, need the transition energy needed be provided for atomic nucleus, this energy is relevant with the angle of externally-applied magnetic field, nuclear magnetic moment and nuclear magnetic moment and externally-applied magnetic field.Normally radio-frequency field provides this energy through adding; And when the frequency that adds radio-frequency field was identical with Larmor frequency, the energy that adds radio-frequency field can be absorbed by atomic nucleus effectively, produces nmr phenomena; At this moment, can produce the echoed signal of nuclear magnetic resonance.
The direction that adds static magnetic field like definition is the Z axle, and the atomic nucleus of spin reaches the angle of being pulled from the Z axle behind the thermal equilibrium state and is called the switching angle, and is provided by following formula: θ=γ B
1τ, wherein θ is the switching angle, B
1Be radio-frequency field intensity, τ is the time that radio-frequency pulse continues, and the intensity of radio-frequency pulse and duration have determined the energy of radio-frequency pulse.
Realize atomic nucleus being gone up (static magnetic field B0 direction is consistent with adding) switching to transverse plane from vertical through the radio-frequency field of emission radio-frequency pulse generation; Usually apply the radio-frequency field vertical with adding the static magnetic field direction; And; The frequency of radio-frequency pulse will equate with Larmor frequency, could guarantee like this nuclear effective switching.
This magnetic nuclear resonance analyzer, magnet be used to produce nuclear magnetic resonance required add static magnetic field; Antenna is used to produce the radio-frequency field that makes sample produce nuclear magnetic resonance, and, can gather the echoed signal that produces behind the sample nuclear magnetic resonance; Certainly; Magnetic nuclear resonance analyzer can also comprise miscellaneous part etc., for example, and host computer, governor circuit and electronic circuit.
In the present embodiment, when sample is carried out Nuclear Magnetic Resonance Measurement, make sample pass glass reinforced plastic pipe; And the static magnetic field that glass reinforced plastic pipe places magnet to produce; Therefore, sample places the part of static magnetic field will produce nmr phenomena, and is wound with antenna on the glass reinforced plastic pipe; To receive echoed signal, this antenna can be solenoid coil or other forms of antenna structure.And antenna, glass reinforced plastic pipe and magnet all are arranged in the magnet housings, and so that magnet is protected, magnet housings also can play the static magnetic field that the shielding magnet produces, and reduces the effect that outer bound pair static magnetic field produces electromagnetic interference (EMI).
This magnetic nuclear resonance analyzer comprises the slide unit that the embodiment of the invention provides, and the magnet housings of magnetic nuclear resonance analyzer can be positioned in the slide unit on the no magnetic recording level platform, and sample can be positioned on the sample holder; And be provided with driving mechanism, through the phase position that can change magnet housings and sample that moves of driving mechanism drive magnet housings, when magnet housings moves on main frame; The phase position of magnet housings and sample will change; And magnet is arranged in the magnet housings, and just the phase position of magnet and sample changes, and then; The static magnetic field that magnet produces and the relative position of sample also just change; Can make the different parts of testing sample place static magnetic field, the different piece of testing sample is carried out Nuclear Magnetic Resonance Measurement, thereby; The size of testing sample is unrestricted, has enlarged the size of carrying out the sample of Nuclear Magnetic Resonance Measurement.
Fig. 3 is for the structural representation of the magnetic nuclear resonance analyzer that the embodiment of the invention provided, and is as shown in Figure 3, and on the basis of the foregoing description, further, this magnetic nuclear resonance analyzer also comprises host computer 22, governor circuit 23 and electronic processing circuit 24.
The parameter information that host computer 22 is used to be provided with measurement pattern to be sending governor circuit 23 to, and the amplitude and the phase information of the echo that governor circuit 23 is transmitted resolve, to obtain information about fluids and the hole information in the sample.
Host computer can be provided with the parameter information of measurement pattern, and this parameter information comprises the frequency, polarization time, echo sounding, echo number of type, the pumping signal of collection period, the testing sample of angle that the rotating shaft of stepper motor rotates, echo etc.Host computer also can be according to obtaining information about fluids and hole information in the sample to the amplitude of the echo that receives and the processing and the inverting of phase information, for example, and the factor of porosity of type of fluid, pore media, pore-size etc. in the sample.
Governor circuit is the control circuit of analyser; Be used for generating various control signals according to the parameter information of measurement pattern, for example, stepping control signal, pumping signal etc.; And the echoed signal after can electronic processing circuit being handled converts digital signal to; And then, obtain the amplitude and the phase information of echo after employing phase sensitive detection algorithm or other algorithms are handled this digital signal, and be uploaded to host computer.
Electronic processing circuit can generate RF pulse signal according to the pumping signal that governor circuit sends, but this RF pulse signal active antenna produces radio-frequency field, and the frequency of this RF pulse signal needs to equate with Larmor frequency, so that sample generation nuclear magnetic resonance; But the electronic processing circuit is the receiving antenna echoed signal of gathering also, and echoed signal is amplified, flowed to governor circuit after the processing such as filtering.
The magnetic nuclear resonance analyzer of present embodiment is divided into several big functional modules with magnetic nuclear resonance analyzer, mainly comprises slide unit, control section, electronic circuit part as bracing frame; Control section is host computer and governor circuit, and electronic circuit partly is an electronic processing circuit, and this analyser adopts idea of modular; Each several part is accomplished function corresponding respectively, and each several part cooperatively interacts; Can accomplish operation easily, reduce operation easier analyser to analyser.
Fig. 4 is the structural representation of the magnetic nuclear resonance analyzer that another embodiment of the present invention provided; As shown in Figure 4; On the analyser basis of structure shown in Figure 3; Further, electronic processing circuit 24 described in this magnetic nuclear resonance analyzer comprises digital to analog converter 241, optical coupling isolator 242, transistor driver 243, isolating transformer 244, transistor circuit 245, DC power supplier 246, first differential driver 247, instrumentation amplifier 248, second level amplifier 249, programmable attenuator 250, two-stage amplifier 251, BPF. 252, second differential driver 253, differential receiver 254 and frequency overlapped-resistable filter 255.
Digital to analog converter 241 links to each other with said governor circuit 23, is used for converting the pumping signal that governor circuit 23 generates to analog electrical signal to send optical coupling isolator 242 to.
Governor circuit is the signal of digital form according to the pumping signal of the parameter information generation of measurement pattern, and the signal that electronic processing circuit is handled is an analog electrical signal, therefore, converts pumping signal to analog electrical signal through digital to analog converter.
Optical coupling isolator 242 is connected between said digital to analog converter 241 and the transistor driver 243, is used for digital to analog converter 241 and transistor driver 243 photoelectricity are isolated.
Optical coupling isolator is used for digital to analog converter and transistor driver are carried out the photoelectricity isolation; And the digital to analog converter front end is a governor circuit; Can prevent that through optical coupling isolator the high-voltage pulse signal that transistor driver and transistor circuit produce from producing interference to governor circuit, and governor circuit is played a protective role.
Isolating transformer 244, the primary side of said isolating transformer 244 links to each other with transistor driver 243, and the secondary side of said isolating transformer 244 links to each other with transistor circuit 245, is used for transistor driver 243 and transistor circuit 245 electrical isolation.
The effect of isolating transformer is with transistor driver and transistor circuit electrical isolation, and the high-voltage dc signal that produces when preventing respective transistor conducting in the transistor circuit causes damage to the device in the transistor driver.Isolating transformer is 1: 1 a transformer, and the output signal of secondary side is all identical with the correlation parameter of the input signal of primary side, signal is not carried out conversion, does not change through the correlation parameter of exporting signal behind the isolating transformer.
Transistor driver 243 links to each other with transistor circuit 245, is used for the analog electrical signal of optical coupling isolator 242 outputs is amplified with the generation drive control signal, and exports through the secondary side of isolating transformer 244.
Transistor driver is in order to amplify analog electrical signal, and to generate drive control signal, this drive control signal can be the curtage signal, is used for the quick conducting of oxide-semiconductor control transistors electric current respective transistor.
DC power supplier 246 links to each other with said transistor circuit 245, is used to said transistor circuit 245 DC voltage is provided.
DC power supplier is used for DC voltage to transistor circuit being provided, and this voltage is generally the bigger voltage of magnitude of voltage, for example, and several kilovolts high voltage.
Transistor circuit 245 links to each other with antenna 25, and the RF pulse signal that is used for DC voltage being chopped into the square-wave pulse form according to said drive control signal produces the radio-frequency field that makes the sample nuclear magnetic resonance with active antenna 25.
Transistor circuit is the circuit of being made up of a plurality of transistors; For example, can be the full bridge switching circuit of forming by four metal-oxide layer-semiconductor-field-effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor is called for short MOSFET); The conducting of each metal-oxide-semiconductor in the drive control signal control circuit or shutoff; DC voltage being chopped into the RF pulse signal of square wave form, and, the frequency of this RF pulse signal and Larmor frequency are equated; But this RF pulse signal active antenna produces radio-frequency field, so that sample generation nuclear magnetic resonance.
First differential driver 247 links to each other with antenna 25, is used for converting the echoed signal that the sample that antenna 25 is gathered generates to two-way differentiated echo signal.
First differential driver is used for converting the echoed signal of antenna collection to two-way differentiated echo signal; Purpose is, through echoed signal is carried out difference processing, can easier recognize more weak echoed signal; And; Because differential signal has hyperimmunization property to external electromagnetic interference, can guarantee the precision in the echoed signal transport process, thinks that governor circuit provides high-precision echoed signal.
Instrumentation amplifier 248; Link to each other with said first differential driver 247 through Shielded Twisted Pair; Through Shielded Twisted Pair said two-way differentiated echo signal is transferred to said instrumentation amplifier 248, after said two-way differentiated echo signal being amplified the first setting multiple, exports one tunnel echoed signal through instrumentation amplifier 248.
Carry out the transmission of differential signal through Shielded Twisted Pair, can resist electromagnetic interference (EMI) extraneous in the echoed signal transmission course and reduce the electromagnetic interference (EMI) between the two-way echoed signal.
Instrumentation amplifier is a kind of differential amplifier; Can receive two-way differentiated echo signal; The echoed signal of microvolt level is amplified back output one tunnel echoed signal, and instrumentation amplifier has very high gain and very little noise figure, has good impedance matching performance and common mode inhibition capacity preferably; Therefore, can reduce the degree of distortion of echoed signal.
Second level amplifier 249 links to each other 248 with said instrumentation amplifier, is used for exporting behind the echoed signal amplification second setting multiple with said instrumentation amplifier 248 outputs.
Because instrumentation amplifier has certain limit to the enlargement factor of echoed signal, therefore, through the second level amplifier echoed signal is carried out secondary amplification back output once more.
Programmable attenuator 250 links to each other with said second level amplifier 249, is used for exporting after the echoed signal attenuation settings amount with 249 outputs of said second level amplifier.
After through above-mentioned instrumentation amplifier and the second level amplifier echoed signal being carried out twice amplification; For avoiding the distortion of echoed signal; Through programmable attenuator echoed signal is decayed; Can make instrumentation amplifier and second level amplifier that the processing and amplifying of signal is had certain dynamic range, thereby can carry out the measurement of high s/n ratio to the sample of different aperture degree, programmable attenuator can be damping capacitys such as 12dB, 18dB, 24dB, 30dB, 36dB, 42dB to the damping capacity of signal.
Two-stage amplifier 251 links to each other with said programmable attenuator 250, is used for that the echoed signal of said programmable attenuator 250 outputs is amplified the 3rd and exports after setting multiple.
BPF. 252 links to each other with said two-stage amplifier 251, is used for suppressing the component of signal of the echoed signal setpoint frequency of said two-stage amplifier 251 outputs.
After the process programmable attenuator is decayed to echoed signal; Signal can weaken, therefore, through two-stage amplifier echoed signal is carried out last amplification once more after; Send BPF. to, the bandwidth that is limited whole electronic processing circuit by BPF. is to suppress noise.
BPF. can make the signal in a certain frequency range in the echoed signal pass through, and the component of signal of other range frequencies is decayed to extremely low-level, to suppress the harmonic wave in the echoed signal.
Second differential driver 253 links to each other with said BPF. 252, is used for converting the echoed signal of said BPF. 252 outputs to two-way differentiated echo signal.
Differential receiver 254 links to each other with said second differential driver 253 through Shielded Twisted Pair, is used for the two-way differentiated echo signal transformation of said second differential driver 253 outputs is become one tunnel echoed signal.
For further reducing the common-mode noise in the signals transmission; Echoed signal is carried out differential transfer; The echoed signal of BPF. being exported through second differential driver converts two-way differentiated echo signal to; And send differential receiver to through Shielded Twisted Pair,, differential receiver becomes one tunnel echoed signal after receiving, to send the circuit of back to.
Frequency overlapped-resistable filter 255 links to each other with said differential receiver 254, and the harmonic signal of echoed signal that is used for filtering said differential receiver 254 outputs is to send governor circuit 23 to.
Frequency overlapped-resistable filter is a kind of low-pass filter, in order to the aliasing frequency component in the echoed signal is reduced to inappreciable degree, to obtain quality echoed signal preferably.
Electronic processing circuit through above-mentioned can be divided into the two large divisions, and first comprises weighted-voltage D/A converter, optical coupling isolator, isolating transformer, transistor driver, DC power supplier and transistor circuit; Second portion comprises first differential driver, instrumentation amplifier, second level amplifier, programmable attenuator, two-stage amplifier, BPF., second differential driver, differential receiver and frequency overlapped-resistable filter; First is used to accomplish the excitation to antenna, makes sample produce nuclear magnetic resonance, after second portion is used for the nuclear magnetic resonance back echo signal that receives handled, obtaining low noise quality echoed signal preferably, and sends governor circuit to.
And governor circuit 23 described in this analyser comprises analog to digital conversion driver 231, analog to digital converter 232, field programmable gate array unit 233 and digital signal processor 234.
Analog to digital conversion driver 231 links to each other with said frequency overlapped-resistable filter, is used for exporting behind the analog voltage signal that echoed signal with the output of said frequency overlapped-resistable filter converts setpoint frequency and amplitude to.
Analog to digital converter 232 links to each other with said analog to digital conversion driver 231, is used for exporting after analog voltage signal with analog to digital conversion driver output converts digital signal to.
The echoed signal of handling back output through electronic circuit is a simulating signal, and host computer can only receiving digital signals, therefore, needs convert the echoed signal of analog form to digital signal to send host computer to.
Analog to digital converter is the device that the echoed signal of analog form is converted to digital signal; And; At the analog to digital converter front end analog to digital conversion driver is set; The transient current that the modulus driver produces when reducing the analog to digital converter sampling as the external buffer of analog to digital converter is to the influence of sampling; Simultaneously analog to digital conversion drives electrical equipment and also can be used for output echoed signal with frequency overlapped-resistable filter and change into and satisfy the setpoint frequency that the analog to digital converter input requires and the voltage signal of amplitude, and then is converted into digital signal by analog to digital converter.
Field programmable gate array unit 233; Link to each other with said analog to digital converter 232; Be used for the digital signal of analog to digital converter 232 outputs is carried out buffer memory; And generate the stepping control signal to send motor driver 301 to according to parameter information, generate control wave to control said motor driver 301 according to said stepping control signal, and generate pumping signal to send said digital to analog converter 241 to stepper motor 302 through the decoded measurement pattern of digital signal processor.
Field programmable gate array (Field-Programmable Gate Array; Be called for short FPGA) unit; Be a kind of special IC, FPGA has adopted this notion of logical cell array, and its inside comprises steering logic sequential generation unit, static store module, interconnector module, each timer sum counter etc.; Can realize combination logic function and sequential logic function, the logic function of FPGA is to realize through loading programming data to its inner static storage cell.
But the parameter information of the decoded measurement pattern of FPGA parallel receive digital signal processor; This parameter information is distributed to its inner each timer or counter; And produce the stepping control signal to send motor driver to by steering logic sequential generation unit; And, can carry out sending to digital signal processor behind the buffer memory to the digital signal that analog to digital converter transmits through its static storage cell.Certainly, also can load other other signals that need of programming data generation through the static storage cell in FPGA.
Digital signal processor 234; Link to each other with said field programmable gate array unit 233; Be used for the parameter information of said measurement pattern is decoded, and generate echo data read signal with the amplitude and the phase information that read stored numbers signal in the said field programmable gate array unit 233 and obtain echo according to preset algorithm to send host computer 22 to.
Digital signal processor (digital signal processor; Be called for short DSP) be a kind of microprocessor of uniqueness; It is the device of handling bulk information with digital signal; Can make amendment to digital signal, delete, processing such as decoding, and can be with returning the digital signal decipher simulated data or actual environment form.It is programmable, and has powerful data-handling capacity, but real time execution per second number is with ten million bar complicated order program.
DSP can receive the parameter information of the measurement pattern that host computer transmits and decodes through usb bus, through parallel bus decoded data is passed to FPGA again; And, can generate echo data according to its clock internal and read signal, reading stored numbers signal among the FPGA, and the amplitude and the phase information that obtain echo according to preset algorithm are to send host computer to.This preset algorithm can have multiple, for example, and phase sensitive detection algorithm etc.
The magnetic nuclear resonance analyzer of the foregoing description provides each element and the circuit structure that comprise in a kind of governor circuit and the electronic processing circuit, certainly, also can adopt other forms of governor circuit and electronic processing circuit, is not limited to shown in the foregoing description.
Fig. 5 is the structural representation of antenna tuning circuit in the magnetic nuclear resonance analyzer that the embodiment of the invention provided; On the basis of the foregoing description; Further; Also comprise antenna tuning circuit in this magnetic nuclear resonance analyzer, as shown in Figure 5, this antenna tuning circuit comprises radio-frequency relay 26 and a plurality of no magnetocapacitances 27.
Wherein, each is not connected in said antenna 25 two ends after having magnetocapacitance 27 series connection; The input end 261 of said radio-frequency relay 26 links to each other with said field programmable gate array unit, and each contact 262 of output terminal is parallelly connected with each said no magnetocapacitance 27 respectively in the said radio-frequency relay 26; Said field programmable gate array unit 233 also is used for generating switch controlling signal according to the parameter information of said measurement pattern; With the closed of each contact 262 of controlling output terminal in the said radio-frequency relay 26 or break off, thereby corresponding no magnetocapacitance 27 is connected in said antenna 25 two ends.
Introduce the principle of work of this antenna tuning circuit below in conjunction with Fig. 5.
As shown in Figure 5; The output terminal of radio-frequency relay 26 comprises a plurality of contacts 262 in this circuit, and each contact 262 can be normally opened contact or normally closed contact, and the input end of radio-frequency relay 26 can receive the switch controlling signal that field programmable gate array unit 233 generates; Radio-frequency relay 26 is according to the disconnection or the closure of the different contact 262 of the different switch controlling signal may command that receive; When a certain contact 262 is closed, with these contact 262 parallelly connected no magnetocapacitances 27 will be by short circuit, when 262 disconnections of a certain contact; To be connected in the two ends of antenna 25 with these contact 262 parallelly connected no magnetocapacitances 27; Therefore, through closure or the off-state of controlling each contact 262, can different no magnetocapacitances 27 be connected in antenna 25 two ends.
Antenna is used to receive echoed signal, its equivalent electrical circuit comprise series connection inductance, resistance and with this inductance and the parallelly connected electric capacity of resistance, for dissimilar samples; The frequency of the echoed signal of its generation is also different; When receiving echoed signal,, can change the correlation parameter of antenna for frequency and the antenna of avoiding echoed signal produces resonance through antenna; For example, the size of the inductance in the equivalent electrical circuit, resistance or electric capacity.The effect of the antenna tuning circuit in the present embodiment just is this; Through different no magnetocapacitances is connected in antenna ends; Can change the size of the capacitance that is connected in antenna ends; Also just changed the capacitance in the equivalent electrical circuit of antenna, and then, reach the purpose that the frequency of avoiding echoed signal and antenna produce resonance.
Fig. 6 is for the structural representation of Q change-over circuit in the magnetic nuclear resonance analyzer that the embodiment of the invention provided and buffer circuit, and is as shown in Figure 5, and this magnetic nuclear resonance analyzer can also comprise Q change-over circuit 28 and buffer circuit 29.
Q change-over circuit 28 is connected to said antenna 25 two ends with buffer circuit 29;
Be connected with two antiparallel first diode D1, first resistance R 1, the first transistor Q1, transistor seconds Q2, second resistance R 2 and two antiparallel second diode D2 in the Q change-over circuit 28 in turn, and the equal ground connection of one of them electrode of said the first transistor Q1 and transistor seconds Q2;
Said the first transistor Q1, transistor seconds Q2, the first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and second switch pipe K2 link to each other with said field programmable gate array unit respectively;
Wherein, Said field programmable gate array unit also is used for generating changeover control signal according to the parameter information of said measurement pattern, to control said the first transistor Q1, transistor seconds Q2, the first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and second switch pipe K2 according to setting sequential turn-on or shutoff;
At said wherein one first diode D1, the first transistor Q1, transistor seconds Q2 with wherein under the equal conducting state of one second diode D2, the two ends of first resistance R 1 and 2 parallel connections of second resistance R and said antenna 25; Under the said first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and the equal conducting state of second switch pipe K2, be parallel to said antenna 25 two ends after the series connection of the conducting resistance of the said first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and second switch pipe K2.
Above-mentioned the first transistor, transistor seconds, the 3rd transistor and the 4th transistor can be transistors such as triode, metal-oxide-semiconductor; First switching tube and second switch pipe can be the on-off circuit of being made up of transistors such as two or more triodes or metal-oxide-semiconductors, and the first transistor, transistor seconds, the 3rd transistor, the 4th transistor, first switching tube and second switch pipe can be according to setting sequential turn-on or shutoff under changeover control signal control.
In the present embodiment, further be provided with Q change-over circuit and buffer circuit, introduce the principle of work of two circuit below in conjunction with Fig. 6.
When gathering echoed signal through antenna, at first active antenna makes antenna produce radio-frequency field, makes sample generation nuclear magnetic resonance; Then; Gather the echoed signal that produces behind the sample nuclear magnetic resonance through antenna again, to antenna encourage produce radio-frequency field after, the radio-frequency field energy that produces in the antenna can be the exponential form decay; Desirable situation is; After zero, it is best to gather the effect of echoed signal through antenna again Deng the radio-frequency field energy attenuation in the antenna, avoids going back in the antenna under the situation of remainder energy influence to the reception of echoed signal.
In the reality, the radio-frequency field energy attenuation in the antenna to zero or very little the needs regular hour be designated as the very first time; This very first time is generally some microseconds; Radio-frequency field to the interval time that produces echoed signal several microseconds are arranged also usually from the antenna generation, be designated as for second time this interval time, collect quality echoed signal preferably for guaranteeing antenna; Generally, can make the very first time less than second time through selection to antenna parameter.
The effect of Q change-over circuit can be played the effect that reduces the above-mentioned very first time in the present embodiment, and is as shown in Figure 6, the equivalent electrical circuit of antenna 25 comprise the inductance L of series connection, resistance r and with this inductance L and the parallelly connected capacitor C of resistance r.
After active antenna 25 generations made the radio-frequency field of sample nuclear magnetic resonance, at this moment, may command made the first transistor Q1 and transistor seconds Q2 conducting; The radio-frequency field energy will produce oscillating voltage in the antenna 25 in attenuation process, and this oscillating voltage is the voltage signal of sinusoidal wave form; When dump energy in the antenna 25 is big; This oscillating voltage is greater than the forward voltage of the first diode D1 and the second diode D2, and two first diode D1 are respectively in the positive half period and the negative half-cycle alternate conduction of sine wave, and two second diode D2 are also respectively in the positive half period and the negative half-cycle alternate conduction of sine wave; First resistance R 1 and second resistance R 2 will be parallel to the two ends of antenna 25; The quality factor q of antenna 25 will reduce, and 25 radio-frequency field energy can flow into the earth with the first transistor Q1 through first resistance R 1 in the antenna, perhaps flows into the earth through second resistance R 2 with transistor seconds Q2; Therefore, can in very short time, release most of energy in the antenna 25.
When the dump energy in the antenna 25 has decayed to less state; The oscillating voltage that antenna 25 produces will be less than the forward voltage of the first diode D1 and the second diode D2; The first diode D1 and the second diode D2 will turn-off; This Q change-over circuit 28 is in open-circuit condition, and the energy in the antenna 25 can not flow into the earth through first resistance R 1 with the first transistor Q1 again, perhaps flows into the earth through second resistance R 2 with transistor seconds Q2.At this moment; The may command first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and second switch pipe K2 conducting; Be connected in parallel on the two ends of antenna 25 after the conducting resistance series connection that forms after this first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and the second switch pipe K2 conducting, this conducting resistance is compared with the resistance of second resistance R 2 with first resistance R 1 and is much smaller, therefore; The quality factor of antenna 25 further reduce; Remaining fraction energy in the antenna 25 can flow into the earth through the first switching tube K1 and the 3rd transistor Q3, perhaps; Flow into the earth, remaining fraction energy in the antenna 25 of can releasing fast through second switch pipe K2 and the 4th transistor Q4.
And; In producing RF pulse signal and the above-mentioned antenna of releasing in most of energy process; Control the first switching tube K1, the 3rd transistor Q3, the 4th transistor Q4 and second switch pipe K2 and turn-off, in circuit such as first differential driver avoiding the high-voltage radio-frequency pulse signal to get into being connected in antenna 25 rear ends, instrumentation amplifier, second amplifier.And during receiving echoed signal; Control the first switching tube K1 and second switch pipe K2 conducting; So that the echoed signal that antenna 25 is gathered gets in the circuit such as first differential driver that is connected in antenna 25 rear ends, instrumentation amplifier, second amplifier, with this echoed signal is further amplified, processing such as filtering.
Can know by foregoing description; Above-mentioned Q change-over circuit can play the effect of radio-frequency field energy in the antenna of releasing fast stage by stage, makes antenna better receive echoed signal, and; Can reduce antenna and gather the time interval between each echoed signal, improve the efficient of acquired signal.Above-mentioned buffer circuit can be isolated high-voltage radio-frequency pulse signal and late-class circuit, avoids the interference of high-voltage radio-frequency pulse signal to late-class circuit.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (10)
1. a magnetic nuclear resonance analyzer slide unit is characterized in that, comprising:
Main frame, said main frame are provided with no magnetic recording level platform, the magnet housings that said no magnetic recording level platform is used to place magnetic nuclear resonance analyzer;
Sample holder is fixedly connected on the said no magnetic recording level platform, and said sample holder is used to place sample;
Driving mechanism; Be arranged on the said main frame; Said driving mechanism links to each other with the magnet housings of magnetic nuclear resonance analyzer, and said driving mechanism is used to drive the moving with the magnet housings that changes magnetic nuclear resonance analyzer and the relative position of sample of magnet housings of said magnetic nuclear resonance analyzer.
2. magnetic nuclear resonance analyzer slide unit according to claim 1 is characterized in that, said driving mechanism comprises:
First belt pulley and second belt pulley; Be arranged at respectively on the said no magnetic recording level platform; Be provided with travelling belt between said first belt pulley and second belt pulley; Said travelling belt links to each other with the magnet housings of magnetic nuclear resonance analyzer, and the magnet housings of said NMR and said no magnetic recording level platform are slidingly connected;
Motor driver links to each other with stepper motor, is used for generating to the Stepping Motor Control pulse signal;
Stepper motor; The rotating shaft of said stepper motor links to each other with said second belt pulley; The rotating shaft of said stepper motor is rotated set angle according to said control wave; Drive said travelling belt rotation to drive said second belt pulley, thereby the magnet housings that drives magnetic nuclear resonance analyzer is slided on said no magnetic recording level platform.
3. magnetic nuclear resonance analyzer slide unit according to claim 1 and 2 is characterized in that:
Said sample holder comprises two for H type support, and the two said H type supports predeterminable range of being separated by is arranged at respectively on the said no magnetic recording level platform;
Wherein, Each said H type support comprises a horizontal gird and two vertical support bar; Two said vertical support bar bottoms are fixed in respectively on the said no magnetic recording level platform, and said horizontal gird two ends are fixed in respectively on each vertical support bar, and sample is set up on the horizontal gird of two said H type supports.
4. magnetic nuclear resonance analyzer slide unit according to claim 1 and 2 is characterized in that:
Said main frame comprises at least one supporting leg, and said no magnetic recording level platform is fixed on the said supporting leg;
Said supporting leg bottom is provided with horizontal panel, and said horizontal panel is used for placing magnetic nuclear resonance analyzer host computer, governor circuit and electronic processing circuit;
Said motor driver is fixed on the bottom wall of said no magnetic recording level platform.
5. a magnetic nuclear resonance analyzer comprises glass reinforced plastic pipe, magnet and antenna, it is characterized in that: also comprise the arbitrary described slide unit of claim 1-4;
Wherein, said antenna is wound in the glass reinforced plastic pipe outside surface, and said antenna fixedly installs with respect to said magnet, and the magnetic field that places said magnet to produce;
Said antenna, glass reinforced plastic pipe and magnet all are arranged in the magnet housings, and said magnet housings is positioned on the no magnetic recording level platform of said slide unit, and sample passes said glass reinforced plastic pipe and is positioned on the sample holder.
6. according to the said magnetic nuclear resonance analyzer of claim 5, it is characterized in that, also comprise:
Host computer, the parameter information that is used to be provided with measurement pattern to be sending governor circuit to, and the amplitude and the phase information of the echo that governor circuit is transmitted resolve, to obtain information about fluids and the hole information in the sample;
Governor circuit; Link to each other with said host computer; Be used for generating the stepping control signal to send motor driver to according to the parameter information of said measurement pattern; Generate the Stepping Motor Control pulse signal according to said stepping control signal to control said motor driver, and generate pumping signal sending the electronic processing circuit to, and the echoed signal after the electronic processing circuit that receives handled converts digital signal to and sends host computer to after with the amplitude that obtains echo and phase information;
Electronic processing circuit; Link to each other with antenna with said governor circuit respectively; Be used for generating RF pulse signal and produce the radio-frequency field that makes the sample nuclear magnetic resonance with active antenna according to the pumping signal that receives; And the echoed signal that produces behind the sample nuclear magnetic resonance of receiving antenna collection,, said echoed signal sends governor circuit to after being handled.
7. according to the said magnetic nuclear resonance analyzer of claim 6, it is characterized in that said electronic processing circuit comprises:
Digital to analog converter links to each other with said governor circuit, is used for converting the pumping signal that governor circuit generates to analog electrical signal to send optical coupling isolator to;
Optical coupling isolator is connected between said digital to analog converter and the transistor driver, is used for digital to analog converter and transistor driver photoelectricity are isolated;
Isolating transformer, the primary side of said isolating transformer links to each other with transistor driver, and the secondary side of said isolating transformer links to each other with transistor circuit, is used for transistor driver and transistor circuit electrical isolation;
Transistor driver links to each other with transistor circuit, is used for the analog electrical signal of optical coupling isolator output is amplified with the generation drive control signal, and exports through the secondary side of isolating transformer;
DC power supplier links to each other with transistor circuit, is used to transistor circuit DC voltage is provided;
Transistor circuit links to each other with antenna, and the RF pulse signal that is used for DC voltage being chopped into the square wave form according to drive control signal produces the radio-frequency field that makes sample generation nuclear magnetic resonance with active antenna;
First differential driver links to each other with antenna, is used for converting the echoed signal that the sample of antenna collection generates to two-way differentiated echo signal;
Instrumentation amplifier; Link to each other with said first differential driver through Shielded Twisted Pair; Through Shielded Twisted Pair said two-way differentiated echo signal is transferred to said instrumentation amplifier, after said two-way differentiated echo signal being amplified the first setting multiple, exports one tunnel echoed signal through instrumentation amplifier;
Second level amplifier links to each other with said instrumentation amplifier, is used for exporting behind the echoed signal amplification second setting multiple with said mobile amplifier output;
Programmable attenuator links to each other with said second level amplifier, is used for exporting after the echoed signal attenuation settings amount with the output of said second level amplifier;
Two-stage amplifier links to each other with said programmable attenuator, is used for that the echoed signal of said programmable attenuator output is amplified the 3rd and exports after setting multiple;
BPF. links to each other with said two-stage amplifier, is used for suppressing the component of signal of the echoed signal setpoint frequency of said two-stage amplifier output;
Second differential driver links to each other with said BPF., is used for converting the echoed signal of said BPF. output to two-way differentiated echo signal;
Differential receiver links to each other with said second differential driver through Shielded Twisted Pair, is used for the two-way differentiated echo signal transformation of said second differential driver output is become one tunnel echoed signal;
Frequency overlapped-resistable filter links to each other with said differential receiver, and the harmonic signal of echoed signal that is used for filtering said differential receiver output is to send governor circuit to.
8. according to the said magnetic nuclear resonance analyzer of claim 7, it is characterized in that said governor circuit comprises:
The analog to digital conversion driver links to each other with said frequency overlapped-resistable filter, is used for exporting behind the analog voltage signal that echoed signal with the output of said frequency overlapped-resistable filter converts setpoint frequency and amplitude to;
Analog to digital converter links to each other with said analog to digital conversion driver, is used for exporting after analog voltage signal with analog to digital conversion driver output converts digital signal to;
The field programmable gate array unit; Link to each other with said analog to digital converter; Be used for the digital signal of analog to digital converter output is carried out buffer memory; And generate the stepping control signal to send motor driver to according to parameter information, generate the Stepping Motor Control pulse signal according to said stepping control signal to control said motor driver, and generate pumping signal to send said digital to analog converter to through the decoded measurement pattern of digital signal processor;
Digital signal processor; Link to each other with digital to analog converter with said field programmable gate array unit; Be used for the parameter information of said measurement pattern is decoded, and generate echo data read signal with the amplitude and the phase information that read stored numbers signal in the said field programmable gate array unit and obtain echo according to preset algorithm to send host computer to.
9. said according to Claim 8 magnetic nuclear resonance analyzer is characterized in that, also comprises:
Antenna tuning circuit, said antenna tuning circuit comprise radio-frequency relay and a plurality of no magnetocapacitance;
Wherein, each is not connected in said antenna ends after having the magnetocapacitance series connection;
The input end of said radio-frequency relay links to each other with said field programmable gate array unit, and each contact of output terminal is parallelly connected with each said no magnetocapacitance respectively in the said radio-frequency relay;
Said field programmable gate array unit also is used for generating switch controlling signal according to the parameter information of said measurement pattern; With the closed of each contact of controlling output terminal in the said radio-frequency relay or break off, thereby corresponding no magnetocapacitance is connected in said antenna ends.
10. according to Claim 8 or 9 said magnetic nuclear resonance analyzers, it is characterized in that, also comprise
Q change-over circuit and buffer circuit, said Q change-over circuit and buffer circuit are connected to said antenna ends;
Be connected with two antiparallel first diodes, first resistance, the first transistor, transistor seconds, second resistance and two antiparallel second diodes in the said Q change-over circuit in turn, and one of them electrode of said the first transistor and transistor seconds ground connection respectively;
Said buffer circuit comprises and is connected with first switching tube, the 3rd transistor, the 4th transistor and second switch pipe in turn, said three transistors and the equal ground connection of the 4th transistorized one of them electrode;
Said the first transistor, transistor seconds, first switching tube, the 3rd transistor, the 4th transistor and second switch pipe link to each other with said field programmable gate array unit respectively;
Wherein, Said field programmable gate array unit also is used for generating changeover control signal according to the parameter information of said measurement pattern, to control said the first transistor, transistor seconds, first switching tube, the 3rd transistor, the 4th transistor and second switch pipe according to setting sequential turn-on or shutoff;
At said wherein one first diode, the first transistor, transistor seconds with wherein under the equal conducting state of one second diode, the two ends of first resistance and the parallel connection of second resistance and said antenna; Under said first switching tube, the 3rd transistor, the 4th transistor and the equal conducting state of second switch pipe, be parallel to said antenna ends after the series connection of the conducting resistance of said first switching tube, the 3rd transistor, the 4th transistor and second switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067251.2A CN102608145B (en) | 2012-03-14 | 2012-03-14 | Nuclear magnetic resonance analyzer and slide table thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067251.2A CN102608145B (en) | 2012-03-14 | 2012-03-14 | Nuclear magnetic resonance analyzer and slide table thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102608145A true CN102608145A (en) | 2012-07-25 |
| CN102608145B CN102608145B (en) | 2015-02-04 |
Family
ID=46525693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210067251.2A Expired - Fee Related CN102608145B (en) | 2012-03-14 | 2012-03-14 | Nuclear magnetic resonance analyzer and slide table thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102608145B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407003A (en) * | 2014-12-26 | 2015-03-11 | 苏州露宇电子科技有限公司 | Novel nuclear magnetic resonance analysis meter |
| CN104458787A (en) * | 2014-12-26 | 2015-03-25 | 苏州露宇电子科技有限公司 | Novel nuclear magnetic resonance analysis meter sliding table |
| CN104459586A (en) * | 2014-12-26 | 2015-03-25 | 苏州露宇电子科技有限公司 | Novel movable nuclear magnetic resonance analyzer |
| CN104483340A (en) * | 2014-12-26 | 2015-04-01 | 苏州露宇电子科技有限公司 | Mobile nuclear magnetic resonance analyzer |
| CN104528160A (en) * | 2014-12-26 | 2015-04-22 | 苏州露宇电子科技有限公司 | Workpiece clamping frame of nuclear magnetic resonance analysis meter |
| CN104635186A (en) * | 2014-12-26 | 2015-05-20 | 苏州露宇电子科技有限公司 | Movable nuclear magnetic resonance analyzer driving mechanism |
| CN104807418A (en) * | 2015-04-30 | 2015-07-29 | 北京科技大学 | Identification system for scrap motor vehicle parts |
| CN105275465A (en) * | 2015-09-23 | 2016-01-27 | 中国石油大学(北京) | Nuclear magnetic resonance logging system |
| CN106154190A (en) * | 2016-06-21 | 2016-11-23 | 中国工程物理研究院材料研究所 | Magnetic measuring device and its implementation for medium managese steel martensitic phase transformation |
| CN108138563A (en) * | 2015-10-01 | 2018-06-08 | 斯伦贝谢技术有限公司 | For the active damping of nuclear magnetic resonance log tool |
| CN112816514A (en) * | 2019-11-15 | 2021-05-18 | 中国石油天然气股份有限公司 | Antenna moving device, nuclear magnetic resonance fluid analyzer and related detection method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988009927A1 (en) * | 1987-06-02 | 1988-12-15 | Thomson-Cgr | Device for fixing and adjusting a holder for carrying gradient coils |
| US5545998A (en) * | 1994-07-14 | 1996-08-13 | Spectrospin Ag | Mixing device for the mixing of fluids in an NMR apparatus including a spring attached to the coil affixed to a mixing rod |
| CN1229627A (en) * | 1998-01-28 | 1999-09-29 | 通用电器横河医药系统株式会社 | MRI system and movable table |
| US6726642B2 (en) * | 1999-12-20 | 2004-04-27 | Barbro Danielsson | Device for compression of the lower extremities for medical imaging purposes |
| CN1843284A (en) * | 2005-04-07 | 2006-10-11 | 中国科学院合肥智能机械研究所 | External magnetic field driving system of in vivo microrobot |
| CN1972629A (en) * | 2001-06-28 | 2007-05-30 | 株式会社日立医药 | Nuclear magnetic resonance diagnosing device and diagnosing system |
| CN101574556A (en) * | 2008-09-19 | 2009-11-11 | 兰州军区兰州总医院 | Osteoporosis therapy system based on variable Helmholtz coils |
| CN101869479A (en) * | 2010-06-13 | 2010-10-27 | 苏州纽迈电子科技有限公司 | Movable low-field nuclear magnetic resonance imaging system |
| CN201719247U (en) * | 2010-06-13 | 2011-01-26 | 苏州纽迈电子科技有限公司 | Movable low-field magnetic resonance imaging system |
| CN101968935A (en) * | 2009-07-27 | 2011-02-09 | 汪健 | Magnetic levitation demonstrating device |
-
2012
- 2012-03-14 CN CN201210067251.2A patent/CN102608145B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988009927A1 (en) * | 1987-06-02 | 1988-12-15 | Thomson-Cgr | Device for fixing and adjusting a holder for carrying gradient coils |
| US5545998A (en) * | 1994-07-14 | 1996-08-13 | Spectrospin Ag | Mixing device for the mixing of fluids in an NMR apparatus including a spring attached to the coil affixed to a mixing rod |
| CN1229627A (en) * | 1998-01-28 | 1999-09-29 | 通用电器横河医药系统株式会社 | MRI system and movable table |
| US6726642B2 (en) * | 1999-12-20 | 2004-04-27 | Barbro Danielsson | Device for compression of the lower extremities for medical imaging purposes |
| CN1972629A (en) * | 2001-06-28 | 2007-05-30 | 株式会社日立医药 | Nuclear magnetic resonance diagnosing device and diagnosing system |
| CN1843284A (en) * | 2005-04-07 | 2006-10-11 | 中国科学院合肥智能机械研究所 | External magnetic field driving system of in vivo microrobot |
| CN101574556A (en) * | 2008-09-19 | 2009-11-11 | 兰州军区兰州总医院 | Osteoporosis therapy system based on variable Helmholtz coils |
| CN101968935A (en) * | 2009-07-27 | 2011-02-09 | 汪健 | Magnetic levitation demonstrating device |
| CN101869479A (en) * | 2010-06-13 | 2010-10-27 | 苏州纽迈电子科技有限公司 | Movable low-field nuclear magnetic resonance imaging system |
| CN201719247U (en) * | 2010-06-13 | 2011-01-26 | 苏州纽迈电子科技有限公司 | Movable low-field magnetic resonance imaging system |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407003A (en) * | 2014-12-26 | 2015-03-11 | 苏州露宇电子科技有限公司 | Novel nuclear magnetic resonance analysis meter |
| CN104458787A (en) * | 2014-12-26 | 2015-03-25 | 苏州露宇电子科技有限公司 | Novel nuclear magnetic resonance analysis meter sliding table |
| CN104459586A (en) * | 2014-12-26 | 2015-03-25 | 苏州露宇电子科技有限公司 | Novel movable nuclear magnetic resonance analyzer |
| CN104483340A (en) * | 2014-12-26 | 2015-04-01 | 苏州露宇电子科技有限公司 | Mobile nuclear magnetic resonance analyzer |
| CN104528160A (en) * | 2014-12-26 | 2015-04-22 | 苏州露宇电子科技有限公司 | Workpiece clamping frame of nuclear magnetic resonance analysis meter |
| CN104635186A (en) * | 2014-12-26 | 2015-05-20 | 苏州露宇电子科技有限公司 | Movable nuclear magnetic resonance analyzer driving mechanism |
| CN104807418A (en) * | 2015-04-30 | 2015-07-29 | 北京科技大学 | Identification system for scrap motor vehicle parts |
| CN104807418B (en) * | 2015-04-30 | 2018-01-02 | 北京科技大学 | One kind scraps motor vehicle components identifying system |
| CN105275465A (en) * | 2015-09-23 | 2016-01-27 | 中国石油大学(北京) | Nuclear magnetic resonance logging system |
| CN108138563A (en) * | 2015-10-01 | 2018-06-08 | 斯伦贝谢技术有限公司 | For the active damping of nuclear magnetic resonance log tool |
| CN108138563B (en) * | 2015-10-01 | 2021-09-21 | 斯伦贝谢技术有限公司 | Active damping for NMR logging tools |
| CN106154190A (en) * | 2016-06-21 | 2016-11-23 | 中国工程物理研究院材料研究所 | Magnetic measuring device and its implementation for medium managese steel martensitic phase transformation |
| CN106154190B (en) * | 2016-06-21 | 2018-11-27 | 中国工程物理研究院材料研究所 | For the magnetic measuring device and its implementation of medium managese steel martensitic traoformation |
| CN112816514A (en) * | 2019-11-15 | 2021-05-18 | 中国石油天然气股份有限公司 | Antenna moving device, nuclear magnetic resonance fluid analyzer and related detection method |
| CN112816514B (en) * | 2019-11-15 | 2024-03-26 | 中国石油天然气股份有限公司 | Antenna moving device, nuclear magnetic resonance fluid analyzer and related detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102608145B (en) | 2015-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102608145A (en) | Nuclear magnetic resonance analyzer and slide table thereof | |
| Simkin et al. | On the use of the total scalar potential on the numerical solution of fields problems in electromagnetics | |
| Fiorillo | Measurements of magnetic materials | |
| Foner et al. | Very low frequency integrating vibrating sample magnetometer (VLFVSM) with high differential sensitivity in high dc fields | |
| CN101438187B (en) | Compact and portable low-field pulsed NMR dispersion analyzer | |
| Mitchell et al. | Low-field permanent magnets for industrial process and quality control | |
| CN102519999B (en) | Magnetic nuclear resonance analyzer and nuclear magnetic resonance measuring method | |
| CN103261907A (en) | State space feedback controller in the digital domain for MRI gradient coil power supply | |
| CN105203973A (en) | Weak magnetism detection device | |
| Chudo et al. | Rotational Doppler effect and Barnett field in spinning NMR | |
| CN108828477A (en) | A kind of TMR array scanning formula rock magnetism detector | |
| Rossi et al. | Operation analysis of a novel concept of RF source known as gyromagnetic line | |
| Cui et al. | Operation analysis of the wideband high-power microwave sources based on the gyromagnetic nonlinear transmission lines | |
| Lin et al. | A review of Air-Core coil sensors in surface geophysical exploration | |
| ES393408A1 (en) | Spin-coupling nuclear magnetic resonance magnetometer utilizing the same coil for excitation and signal pick-up and using toroidal samples | |
| US5136243A (en) | Apparatus and element for mapping a static magnetic field | |
| CN103267957B (en) | A kind of SCM Based nuclear magnetic resoance spectrum instrument circuit | |
| CN104155618A (en) | No damage test device of permanent magnet magnetic field intensity | |
| CN104133184A (en) | Non-destructive test method and device for average magnetic field intensity of permanent magnet | |
| Pikulski et al. | A firmware-defined digital direct-sampling NMR spectrometer for condensed matter physics | |
| Hoon et al. | The design and operation of an automated double-crank vibrating sample magnetometer | |
| Messer et al. | Broadband calibration of radio-frequency magnetic induction probes | |
| CN106646294A (en) | Nuclear magnetic resonance spectrometer probe | |
| Li et al. | Overhauser magnetometer sensor design for magnetic field observation | |
| CN218917532U (en) | Novel test system for magnetic field immunity test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20210314 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |