CN102608145B - Nuclear magnetic resonance analyzer and slide table thereof - Google Patents
Nuclear magnetic resonance analyzer and slide table thereof Download PDFInfo
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- CN102608145B CN102608145B CN201210067251.2A CN201210067251A CN102608145B CN 102608145 B CN102608145 B CN 102608145B CN 201210067251 A CN201210067251 A CN 201210067251A CN 102608145 B CN102608145 B CN 102608145B
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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 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 utilizes nuclear magnetic resonance principle to carry out a kind of instrument of nuclear magnetic resonance experiment to sample, by realizing the detection to sample interior structure and macroscopic property to the parsing of experimental data.
At present, existing magnetic nuclear resonance analyzer mainly comprises magnet, antenna, governor circuit, electronic circuit and host computer etc., and magnet is for generation of the static magnetic field needed for nuclear magnetic resonance; The various parameters that governor circuit is used for arranging according to host computer generate and transmit, and send antenna to after being processed transmitting by electronic circuit, produce the radio-frequency field making sample nuclear magnetic resonance with active antenna; Electronic circuit also can process 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 amplitude and the phase information of echo; Host computer is resolved the amplitude of the echoed signal that governor circuit transmits and phase information, to obtain the fluid information and hole information etc. in sample.
When carrying out Nuclear Magnetic Resonance Measurement to sample, sample need be positioned in the static magnetic field of magnet generation, in existing magnetic nuclear resonance analyzer, the static magnetic field that magnet produces is within the scope of certain space, and the size of sample can not exceed the spatial dimension that magnet produces static magnetic field, thus, the size particularly length of sample, is very limited.
Summary of the invention
The invention provides a kind of magnetic nuclear resonance analyzer slide unit and magnetic nuclear resonance analyzer, to expand the size of the sample carrying out Nuclear Magnetic Resonance Measurement.
Magnetic nuclear resonance analyzer slide unit provided by the invention, comprising:
Main frame, described main frame is provided with without magnetic recording level platform, described without magnetic recording level platform for placing the magnet housings of magnetic nuclear resonance analyzer;
Sample holder, be fixedly connected on described without on magnetic recording level platform, described sample holder is for placing sample;
Driving mechanism, be arranged on described main frame, described driving mechanism is connected with the magnet housings of magnetic nuclear resonance analyzer, and described driving mechanism is for driving the movement of the magnet housings of described magnetic nuclear resonance analyzer with the relative position of the magnet housings and sample that change magnetic nuclear resonance analyzer.
Another aspect of the present invention there is 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 present invention provides;
Wherein, described antenna is wound in glass reinforced plastic pipe outside surface, and described antenna is fixedly installed relative to described magnet, and is placed in the magnetic field of described magnet generation;
Described antenna, glass reinforced plastic pipe and magnet are all arranged in magnet housings, described magnet housings be positioned over described slide unit without on magnetic recording level platform, sample is through described glass reinforced plastic pipe and being positioned on described sample holder.
Magnetic nuclear resonance analyzer slide unit provided by the invention, the magnet housings of magnetic nuclear resonance analyzer can be positioned over without on magnetic recording level platform, sample can be positioned on sample holder, and be provided with driving mechanism, drive the movement of magnet housings can change the phase position of magnet housings and sample by driving mechanism, when magnet housings moves on main frame, the phase position of magnet housings and sample will change, and magnet is arranged in magnet housings, namely the phase position of magnet and sample changes, and then, the relative position of the uniform magnetic field that magnet produces and sample also just changes, the different parts of testing sample can be made to be placed in uniform magnetic field, Nuclear Magnetic Resonance Measurement is carried out to the different piece of testing sample, thus, the size of testing sample is unrestricted, expand the size of the sample carrying out Nuclear Magnetic Resonance Measurement.
Accompanying drawing explanation
The structural representation of the magnetic nuclear resonance analyzer slide unit that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the magnetic nuclear resonance analyzer slide unit that Fig. 2 provides for another embodiment of the present invention;
The structural representation of the magnetic nuclear resonance analyzer that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the magnetic nuclear resonance analyzer that Fig. 4 provides for another embodiment of the present invention;
The structural representation of antenna tuning circuit in the magnetic nuclear resonance analyzer that Fig. 5 provides for the embodiment of the present invention;
The structural representation of Q change-over circuit and buffer circuit in the magnetic nuclear resonance analyzer that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Magnetic nuclear resonance analyzer utilizes nuclear magnetic resonance principle to carry out the instrument of nuclear magnetic resonance experiment to sample, and magnetic nuclear resonance analyzer mainly comprises magnet, antenna, governor circuit, electronic circuit and host computer etc.
Embodiments provide 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 on this slide unit respectively, and make sample be placed in the magnetic field of magnetic nuclear resonance analyzer magnet generation, to carry out nuclear magnetic resonance experiment.
The structural representation of the magnetic nuclear resonance analyzer slide unit that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, this slide unit comprises main frame 1, sample holder 2 and driving mechanism 3.
Main frame 1 is provided with without magnetic recording level platform 101, without magnetic recording level platform 101 for placing the magnet housings 20 of magnetic nuclear resonance analyzer; Sample holder 2 is fixedly connected on without on magnetic recording level platform 101, and sample holder 2 is for placing sample 21; Driving mechanism 3 is arranged on main frame 1, driving mechanism 3 is connected with the magnet housings 20 of magnetic nuclear resonance analyzer, is driven the movement of the magnet housings 20 of magnetic nuclear resonance analyzer with the relative position of the magnet housings 20 with sample 21 that change magnetic nuclear resonance analyzer by driving mechanism 3.
Main frame is the support frame of whole slide unit, multiple material can be adopted to make, such as, wood materials, the metal material such as copper, aluminium alloy, the version of main frame also has multiple, can be as shown in fig. 1, for the structure of table type, comprise multiple supporting leg, multiple supporting leg is arranged a horizontal table top, namely this horizontal table top can be used as without magnetic recording level platform, non-magnetizable material is adopted to make without magnetic recording level platform, such as, timber, aluminium alloy etc.Certainly, main frame also can be other structure, is not limited to shown in Fig. 1.
The magnet of magnetic nuclear resonance analyzer can be positioned in magnet housings, and to protect magnet, and magnet housings can play the magnetic field that shielding magnet produces, and avoids effect magnetic field being produced to interference.Main frame is provided with without magnetic recording level platform, can be fixedly connected with without magnetic recording level platform with main frame, can be used for the magnet housings of placing magnetic nuclear resonance analyzer without magnetic recording level platform.
Sample holder is fixedly connected on without on magnetic recording level platform, sample holder is for placing sample, it can be various structures form, concrete structure can design by concrete shape per sample, as shown in Figure 1, testing sample is cylindrical, sample holder can be the bracing frame of H type, the magnet of nuclear magnetic resonance analyser is positioned in magnet housings, the uniform magnetic field that magnet produces will be positioned at magnet housings, when measuring testing sample, testing sample can be made to pass magnet housings, the measure portion of testing sample to be placed in the uniform magnetic field that magnet produces, and the two ends of cylindrical testing sample are positioned on the crossbeam of H type bracing frame.Certainly, if the sample holder that can design other structures is to place testing sample, the structure shown in Fig. 1 is not limited to.
Driving mechanism is arranged on main frame, and driving mechanism is connected with the magnet housings of magnetic nuclear resonance analyzer, moves for magnet casing, to change the relative position of magnet housings and sample.
Driving mechanism can be the structure be made up of motor and belt etc., magnet housings is connected with belt or is positioned on belt, drive belt to rotate by the rotation of machine shaft, thus drive the position of magnet housings to move, to change the phase position of magnet housings and sample; Driving mechanism also can be the structure be made up of hydraulic mechanism, catch bar etc., magnet housings is connected with catch bar, control catch bar by hydraulic mechanism to move, to change the phase position of magnet housings and sample, the present embodiment just enumerates the form of several driving mechanism, driving mechanism can have various structures form, is not limited to shown in the present embodiment.
As shown from the above technical solution, the magnet housings of magnetic nuclear resonance analyzer can be positioned over without on magnetic recording level platform, sample can be positioned on sample holder, and be provided with driving mechanism, drive the movement of magnet housings can change the phase position of magnet housings and sample by driving mechanism, when magnet housings moves on main frame, the phase position of magnet housings and sample will change, and magnet is arranged in magnet housings, namely the phase position of magnet and sample changes, and then, the relative position of the uniform magnetic field that magnet produces and sample also just changes, the different parts of testing sample can be made to be placed in uniform magnetic field, Nuclear Magnetic Resonance Measurement is carried out to the different piece of testing sample, thus, the size of testing sample is unrestricted, expand the size of the sample carrying out Nuclear Magnetic Resonance Measurement.
The structural representation of the magnetic nuclear resonance analyzer slide unit that Fig. 2 provides for another embodiment of the present invention, on the basis of above-described embodiment, further, as shown in Figure 2, the driving mechanism 3 of this magnetic nuclear resonance analyzer slide unit comprises the first belt pulley, the second belt pulley, motor driver 301 and stepper motor 302.
First belt pulley and the second belt pulley (not shown) are arranged at without on magnetic recording level platform 101 respectively, travelling belt 303 is provided with between first belt pulley and the second belt pulley, travelling belt 303 is connected with the magnet housings 20 of magnetic nuclear resonance analyzer, and the magnet housings 20 of nuclear magnetic resonance analyser be slidably connected without magnetic recording level platform 101.
By being spirally connected, the first belt pulley is fixedly connected with the second belt pulley and is arranged at without on magnetic recording level platform by the mode such as riveted joint, between the first belt pulley and the second belt pulley, travelling belt is set, travelling belt is connected with the magnet housings of magnetic nuclear resonance analyzer, and, magnet housings be slidably connected without magnetic recording level platform, when travelling belt rotates, magnet housings can be driven to slide without on magnetic recording level platform.
Motor driver 301 is connected with stepper motor 302, for generating the control wave to stepper motor 302.
The rotating shaft 312 of stepper motor 302 is connected with the second belt pulley, the rotating shaft 312 of stepper motor 302 rotates set angle according to control wave, to drive the second belt pulley to drive travelling belt 303 to rotate, thus the magnet housings 100 of magnetic nuclear resonance analyzer is driven to slide without on magnetic recording level platform 11.
Stepper motor is motor electric impulse signal being changed into angular displacement or displacement of the lines, the rotating speed of stepper motor, the position of stopping depend on frequency and the umber of pulse of pulse signal, motor driver is for generating the control wave to stepper motor, with the axis of rotation of Driving Stepping Motor, motor driver often generates a pulse signal, the fixing angle of (forward or reverse) is rotated by the direction of setting with regard to Driving Stepping Motor, this angle also claims stepping angle, and the rotation of stepper motor runs step by step with fixing angle.Pilot angle displacement can be carried out by the number of control wave, speed and the acceleration of control step electric machine rotation can be come simultaneously by the frequency of control wave, thus reach the object of accurately location and speed governing.
In the present embodiment, the rotating shaft of stepper motor is connected with the second belt pulley, thus stepper motor drives the second pulley rotation under motor driver controls, second belt pulley is as driving wheel, first belt pulley, as engaged wheel, drives travelling belt along the first belt pulley and the second pulley rotation by the second pulley rotation, and then, drive magnet housings sliding without on magnetic recording level platform by travelling belt, change the relative position of magnet housings and sample.
Driving mechanism in the present embodiment adopts the drives structure of stepper motor and travelling belt, by the shift position of step motor control magnet housings, there is the repeatability of good positional precision and motion, therefore, the position that sample is placed in magnets produce magnetic fields can be located more accurately, improve the precision measured.
And, as shown in Figure 2, in this slide unit, sample holder 2 comprises two for H type support, two H type supports predeterminable range of being separated by is arranged at without on magnetic recording level platform 101 respectively, wherein, each H type support comprises and is fixed in without on magnetic recording level platform 101 respectively bottom a horizontal gird 201 and two vertical support bar 202, two vertical support bar 202, horizontal gird 201 two ends are fixed in each vertical support bar 202 respectively, 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, is fixed on supporting leg 102 without magnetic recording level platform 101; Supporting leg 102 bottom is provided with horizontal panel 103, and horizontal panel 103 is for placing host computer 22 in magnetic nuclear resonance analyzer, governor circuit 23 and electronic processing circuit 24; Motor driver 301 is fixed in the bottom wall without magnetic recording level platform 101.
Above-described embodiment just enumerates a kind of slide unit structure of magnetic nuclear resonance analyzer of form, and in actual applications, art technology can do corresponding change to above-mentioned structure, be not limited to the structure of above-described embodiment.
The embodiment of the present invention additionally 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 present invention provides, wherein, described antenna is wound in glass reinforced plastic pipe outside surface, described antenna is fixedly installed relative to described magnet, and is placed in the magnetic field of described magnet generation; Described antenna, glass reinforced plastic pipe and magnet are all arranged in magnet housings, described magnet housings be positioned over described slide unit without on magnetic recording level platform, sample is through described glass reinforced plastic pipe and being positioned on sample holder.
Magnetic nuclear resonance analyzer is the instrument utilizing nmr phenomena to measure sample, first simply introduces nmr phenomena below.
Nuclear magnetic resonance refers to that atomic nucleus, under another externally-applied magnetic field effect, energy level transition occurs, and is transitted to the physical phenomenon of high-energy state by low-energy state.
Not all atomic nucleus can produce this phenomenon, and only have magnetic core to produce nmr phenomena, mass number and proton number are the atomic nucleus of even number, and spin quantum number is 0, and this nucleid does not spin phenomenon, is called non-magnetic atom core.Mass number is the atomic nucleus of odd number, and spin quantum number is half-integer, and its spin quantum number is not 0, is called magnetic atom core.Mass number is even number, and proton number is the atomic nucleus of odd number, and spin quantum number is integer, and such core is also magnetic atom core.
When magnetic atom nuclear spin, can because of spin generation magnetic moment, the electromagnetic wave of characteristic frequency can be absorbed after this atomic nucleus receives the energy input in other sources in additional static magnetic field, energy level transition is produced to higher energy level from lower energy level transition, this process is exactly nuclear magnetic resonance, when there is nuclear magnetic resonance, the angle of nuclear moments and externally-applied magnetic field can change.
The frequency of atomic nucleus generation energy level transition is determined by the intensity of externally-applied magnetic field and the character of atomic nucleus itself, that is, for a certain specific atoms, in the externally-applied magnetic field of some strength, the frequency of its atomic nucleus precession is changeless, and this frequency is called as Larmor frequency.
In order to allow atomic nucleus generation energy level transition, need for atomic nucleus provides energy required for transition, this energy is relevant to the angle of externally-applied magnetic field, nuclear magnetic moment and nuclear magnetic moment and externally-applied magnetic field.This energy is normally provided by applied radio frequency field, and when the frequency of applied radio frequency field is identical with Larmor frequency time, the energy of applied radio frequency field can be absorbed by atomic nucleus effectively, produces nmr phenomena, now, the echoed signal of nuclear magnetic resonance can be produced.
If the direction defining additional static magnetic field is Z axis, pulled after the atomic nucleus of spin reaches thermal equilibrium state and be called switching angle from the angle of Z axis, and provided by following formula: θ=γ B
1τ, wherein θ is switching angle, B
1for radio-frequency field intensity, τ is the time that radio-frequency pulse continues, and the intensity of radio-frequency pulse and duration determine the energy of radio-frequency pulse.
Realize by launching radio-frequency field that radio-frequency pulse produces by atomic nucleus from (consistent with additional static magnetic field B0 direction) switching longitudinally to transverse plane, the radio-frequency field that usual applying is vertical with additional static magnetic field direction, and, the frequency of radio-frequency pulse is equal with Larmor frequency, and such guarantee is to nuclear effective switching.
This magnetic nuclear resonance analyzer, magnet is for generation of the additional static magnetic field needed for nuclear magnetic resonance; Antenna produces the radio-frequency field of nuclear magnetic resonance for generation of making sample, and, the echoed signal produced after sample nuclear magnetic resonance can be gathered, certainly, magnetic nuclear resonance analyzer can also comprise miscellaneous part etc., such as, and host computer, governor circuit and electronic circuit.
In the present embodiment, when carrying out Nuclear Magnetic Resonance Measurement to sample, sample is made to pass glass reinforced plastic pipe, and glass reinforced plastic pipe is placed in the static magnetic field that magnet produces, therefore, the part that sample is placed in static magnetic field will produce nmr phenomena, and glass reinforced plastic pipe is wound with antenna, to receive echoed signal, this antenna can be solenoid coil or other forms of antenna structure.Further, antenna, glass reinforced plastic pipe and magnet are all arranged in magnet housings, and to protect magnet, magnet housings also can play the static magnetic field that 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 present invention provides, the magnet housings of magnetic nuclear resonance analyzer can be positioned in slide unit without on magnetic recording level platform, sample can be positioned on sample holder, and be provided with driving mechanism, drive the movement of magnet housings can change the phase position of magnet housings and sample by driving mechanism, when magnet housings moves on main frame, the phase position of magnet housings and sample will change, and magnet is arranged in magnet housings, namely the phase position of magnet and sample changes, and then, the relative position of the static magnetic field that magnet produces and sample also just changes, the different parts of testing sample can be made to be placed in static magnetic field, Nuclear Magnetic Resonance Measurement is carried out to the different piece of testing sample, thus, the size of testing sample is unrestricted, expand the size of the sample carrying out Nuclear Magnetic Resonance Measurement.
The structural representation of the magnetic nuclear resonance analyzer that Fig. 3 provides for the embodiment of the present invention, as shown in Figure 3, on the basis of above-described embodiment, further, this magnetic nuclear resonance analyzer also comprises host computer 22, governor circuit 23 and electronic processing circuit 24.
Host computer 22 is for arranging the parameter information of measurement pattern to send governor circuit 23 to, and the amplitude of echo transmitted governor circuit 23 and phase information are resolved, to obtain fluid information in sample and hole information.
Host computer can arrange the parameter information of measurement pattern, and this parameter information comprises angle, the collection period of echo, the type of testing sample, the frequency, polarization time, echo sounding, echo number etc. of pumping signal of the axis of rotation of stepper motor.Host computer also can according to the fluid information obtained the amplitude of the echo received and the process of phase information and inverting in sample and hole information, such as, and the type of fluid, the factor of porosity, pore-size etc. of pore media in sample.
Governor circuit 23 is connected with host computer 22, for generating step motion control signal to send motor driver 301 to according to the parameter information of described measurement pattern, to control described motor driver 301 according to the control wave of described step motion control signal generation to stepper motor 302, and generate pumping signal to send electronic processing circuit 24 to, and the echoed signal after the electronic processing circuit 24 received is converted to digital signal send host computer 22 to after obtaining the amplitude of echo and phase information.
Governor circuit is the control circuit of analyser, for generating various control signal according to the parameter information of measurement pattern, such as, step motion control signal, pumping signal etc., and can the echoed signal after electronic processing circuit process be converted to digital signal, and then, obtain amplitude and the phase information of echo after adopting phase sensitive detection algorithm or other algorithms to process this digital signal, and be uploaded to host computer.
Electronic processing circuit 24, be connected with antenna 25 with described governor circuit 23 respectively, the radio-frequency field making sample nuclear magnetic resonance is produced with active antenna 25 for generating radio-frequency (RF) pulse signal according to the pumping signal received, and the echoed signal produced after the sample nuclear magnetic resonance of receiving antenna 25 collection, after described echoed signal being processed, send governor circuit 23 to.
The pumping signal that electronic processing circuit can send according to governor circuit generates radio-frequency (RF) pulse signal, and this radio-frequency (RF) pulse signal can produce radio-frequency field by active antenna, and the frequency of this radio-frequency (RF) pulse signal need be equal with Larmor frequency, to make sample generation nuclear magnetic resonance; Electronic processing circuit also can the echoed signal that gathers of receiving antenna, and amplifies echoed signal, flows to governor circuit after the process such as filtering.
The magnetic nuclear resonance analyzer of the present embodiment, magnetic nuclear resonance analyzer is divided into several large functional module, mainly comprise slide unit, control section, the electronic circuitry part as bracing frame, control section is host computer and governor circuit, and electronic circuitry part is electronic processing circuit, this analyser adopts modular design philosophy, each several part completes corresponding function respectively, and each several part cooperatively interacts, the operation to analyser can be completed easily, reduce the operation easier to analyser.
The structural representation of the magnetic nuclear resonance analyzer that Fig. 4 provides for another embodiment of the present invention, as shown in Figure 4, on the analyser basis of structure shown in Fig. 3, further, described in this magnetic nuclear resonance analyzer, electronic processing circuit 24 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, bandpass filter 252, second differential driver 253, differential receiver 254 and frequency overlapped-resistable filter 255.
Digital to analog converter 241 is connected with described governor circuit 23, and the pumping signal for being generated by governor circuit 23 converts analog electrical signal to send optical coupling isolator 242 to.
The pumping signal that governor circuit generates according to the parameter information of measurement pattern is the signal of digital form, and the signal of electronic processing circuit process is analog electrical signal, therefore, converts pumping signal to analog electrical signal by digital to analog converter.
Optical coupling isolator 242, is connected between described digital to analog converter 241 and transistor driver 243, for by digital to analog converter 241 and transistor driver 243 Phototube Coupling.
Optical coupling isolator is used for digital to analog converter and transistor driver to carry out Phototube Coupling; and digital to analog converter front end is governor circuit; the high-voltage pulse signal that can prevent transistor driver and transistor circuit from producing by optical coupling isolator produces interference to governor circuit, and plays a protective role to governor circuit.
Isolating transformer 244, the primary side of described isolating transformer 244 is connected with transistor driver 243, and the secondary side of described isolating transformer 244 is connected with transistor circuit 245, for by transistor driver 243 and transistor circuit 245 electrical isolation.
The effect of isolating transformer is by transistor driver and transistor circuit electrical isolation, causes damage to prevent the high-voltage dc signal produced during respective transistor conducting in transistor circuit to the device in transistor driver.Isolating transformer is the transformer of 1: 1, and the output signal of secondary side is all identical with the correlation parameter of the input signal of primary side, and do not convert signal, the correlation parameter outputed signal after isolating transformer does not change.
Transistor driver 243, is connected with transistor circuit 245, and the analog electrical signal for being exported by optical coupling isolator 242 carries out amplifying to generate 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 curtage signal, for controlling the fast conducting of respective transistor in transistor current.
DC power supplier 246, is connected with described transistor circuit 245, for providing DC voltage for described transistor circuit 245.
DC power supplier is used for providing DC voltage to transistor circuit, and this voltage is generally the larger voltage of magnitude of voltage, such as, and the high voltage of several kilovolts.
Transistor circuit 245, is connected with antenna 25, produces for the radio-frequency (RF) pulse signal according to described drive control signal DC voltage being chopped into square-wave pulse form the radio-frequency field making sample nuclear magnetic resonance with active antenna 25.
Transistor circuit is the circuit be made up of multiple transistor, such as, can be by four metal-oxide layer-semiconductor-field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, be called for short MOSFET) full bridge switching circuit that forms, the conducting of each metal-oxide-semiconductor in drive control signal control circuit or shutoff, DC voltage to be chopped into the radio-frequency (RF) pulse signal of square, and, make the frequency of this radio-frequency (RF) pulse signal equal with Larmor frequency, this radio-frequency (RF) pulse signal can produce radio-frequency field by active antenna, to make sample generation nuclear magnetic resonance.
First differential driver 247, is connected with antenna 25, and the echoed signal that the sample for being gathered by antenna 25 generates converts two-pass DINSAR echoed signal to.
First differential driver is used for converting the echoed signal of antenna collection to two-pass DINSAR echoed signal, object is, through carrying out difference processing to echoed signal, can easier recognize more weak echoed signal, and, because Difference signal pair external electromagnetic interference has hyperimmunization, the precision in echoed signal transport process can be ensured, think that governor circuit provides high-precision echoed signal.
Instrumentation amplifier 248, be connected with described first differential driver 247 by Shielded Twisted Pair, by Shielded Twisted Pair, described two-pass DINSAR echoed signal is transferred to described instrumentation amplifier 248, after described two-pass DINSAR echoed signal being amplified the first setting multiple by instrumentation amplifier 248, exports a road echoed signal.
The transmission of differential signal is carried out, electromagnetic interference (EMI) electromagnetic interference (EMI) extraneous in echoed signal transmitting procedure can resisted and reduce between two-way echoed signal by Shielded Twisted Pair.
Instrumentation amplifier is a kind of differential amplifier, two-pass DINSAR echoed signal can be received, a road echoed signal is exported after the echoed signal of microvolt level being amplified, instrumentation amplifier has very high gain and very little noise figure, there is good impedance matching performance and good common mode inhibition capacity, therefore, the degree of distortion of echoed signal can be reduced.
Second level amplifier 249, is connected 248 with described instrumentation amplifier, and the echoed signal for being exported by described instrumentation amplifier 248 exports after amplifying the second setting multiple.
Because the enlargement factor of instrumentation amplifier to echoed signal has certain limit, therefore, export after again secondary amplification being carried out to echoed signal by second level amplifier.
Programmable attenuator 250, is connected with described second level amplifier 249, exports for after the echoed signal attenuation settings amount that exported by described second level amplifier 249.
After twice amplification being carried out to echoed signal by above-mentioned instrumentation amplifier and second level amplifier, for avoiding the distortion of echoed signal, by programmable attenuator, echoed signal is decayed, instrumentation amplifier and the amplification process of second level amplifier to signal can be made to have certain dynamic range, thus the measurement of high s/n ratio can be carried out to the sample of different aperture degree, programmable attenuator can be the damping capacitys such as 12dB, 18dB, 24dB, 30dB, 36dB, 42dB to the damping capacity of signal.
Two-stage amplifier 251, is connected with described programmable attenuator 250, and the echoed signal for being exported by described programmable attenuator 250 exports after amplifying the 3rd setting multiple.
Bandpass filter 252, is connected with described two-stage amplifier 251, the component of signal of setpoint frequency in the echoed signal exported for suppressing described two-stage amplifier 251.
After programmable attenuator is decayed to echoed signal, signal can weaken, therefore, after again carrying out last amplification by two-stage amplifier to echoed signal, send bandpass filter to, limit the bandwidth of whole electronic processing circuit with restraint speckle by bandpass filter.
Bandpass filter can make the signal in echoed signal in a certain frequency range pass through, and the component of signal of other range frequencies is decayed to pole low-level, to suppress the harmonic wave in echoed signal.
Second differential driver 253, is connected with described bandpass filter 252, converts two-pass DINSAR echoed signal to for the echoed signal described bandpass filter 252 exported.
Differential receiver 254, is connected with described second differential driver 253 by Shielded Twisted Pair, is transformed into a road echoed signal for the two-pass DINSAR echoed signal described second differential driver 253 exported.
For reducing the common-mode noise in signals transmission further, differential transfer is carried out to echoed signal, the echoed signal that bandpass filter exports is converted to two-pass DINSAR echoed signal by the second differential driver, and send differential receiver to by Shielded Twisted Pair, a road echoed signal is become, to send circuit below to after differential receiver receives.
Frequency overlapped-resistable filter 255, is connected with described differential receiver 254, for filter described differential receiver 254 export echoed signal in harmonic signal 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 echoed signal is reduced to inappreciable degree, to obtain the good echoed signal of quality.
Through above-mentioned electronic processing circuit, can be divided into two large divisions, Part I comprises weighted-voltage D/A converter, optical coupling isolator, isolating transformer, transistor driver, DC power supplier and transistor circuit; Part II comprises the first differential driver, instrumentation amplifier, second level amplifier, programmable attenuator, two-stage amplifier, bandpass filter, the second differential driver, differential receiver and frequency overlapped-resistable filter; Part I has been used for the excitation of twin aerial, make sample produce nuclear magnetic resonance, Part II be used for the nuclear magnetic resonance back echo signal received is processed after, to obtain the good echoed signal of low noise quality, and send governor circuit to.
Further, 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, is connected with described frequency overlapped-resistable filter, and the echoed signal for being exported by described frequency overlapped-resistable filter exports after converting the analog voltage signal of setpoint frequency and amplitude to.
Analog to digital converter 232, is connected with described analog to digital conversion driver 231, exports after the analog voltage signal for being exported by analog to digital conversion driver converts digital signal to.
The echoed signal exported after electronic circuit process is simulating signal, and host computer can only receive digital signal, therefore, need convert the echoed signal of analog form to digital signal to send host computer to.
Analog to digital converter is the device echoed signal of analog form being converted to digital signal, and, in analog to digital converter front end, analog to digital conversion driver is set, modulus driver reduces the transient current of generation when analog to digital converter is sampled to the impact of sampling as the external buffer of analog to digital converter, analog to digital conversion drives electrical equipment also to can be used for the output echoed signal of frequency overlapped-resistable filter to change into meet the setpoint frequency of analog to digital converter input requirements and the voltage signal of amplitude simultaneously, and then is converted into digital signal by analog to digital converter.
Field programmable gate array unit 233, be connected with described analog to digital converter 232, digital signal for being exported by analog to digital converter 232 carries out buffer memory, and generate step motion control signal to send motor driver 301 to according to the parameter information through the decoded measurement pattern of digital signal processor, to control described motor driver 301 according to the control wave of described step motion control signal generation to stepper motor 302, and generate pumping signal to send described digital to analog converter 241 to.
Field programmable gate array (Field-Programmable Gate Array, be called for short FPGA) unit, for a kind of special IC, FPGA have employed this concept of logical cell array, 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 realizes by loading programming data to the static storage cell of its inside.
FPGA can walk abreast and receive the parameter information of the decoded measurement pattern of digital signal processor, this parameter information is distributed to each timer or the counter of its inside, and produce step motion control signal to send motor driver to by steering logic sequential generation unit, further, digital signal processor is sent to after buffer memory being carried out to the digital signal that analog to digital converter transmits by its static storage cell.Certainly, the programming data also loading other by the static storage cell in FPGA generates other desired signal.
Digital signal processor 234, be connected with described field programmable gate array unit 233, for decoding to the parameter information of described measurement pattern, and generate echo data and read signal to read the digital signal that stores in described field programmable gate array unit 233 and to obtain the amplitude of echo and phase information to send host computer 22 to according to preset algorithm.
Digital signal processor (digital signal processor, be called for short DSP) be a kind of microprocessor of uniqueness, to process the device of bulk information with digital signal, can modify to digital signal, delete, the process such as decoding, and simulated data or actual environment form can be returned by digital signal decipher.It is programmable, and has powerful data-handling capacity, can the every number of seconds of real time execution with ten million bar complicated order program.
DSP receives the parameter information of the measurement pattern that host computer transmits by usb bus and decodes, then by parallel bus, decoded data is passed to FPGA; Further, echo data can be generated according to the clock of its inside and read signal, to read the digital signal stored in FPGA, and obtain the amplitude of echo and phase information to send host computer to according to preset algorithm.This preset algorithm can have multiple, such as, and phase sensitive detection algorithm etc.
The magnetic nuclear resonance analyzer of above-described embodiment, provides each element and circuit structure that comprise in a kind of governor circuit and electronic processing circuit, certainly, also can adopt other forms of governor circuit and electronic processing circuit, be not limited to shown in above-described embodiment.
The structural representation of antenna tuning circuit in the magnetic nuclear resonance analyzer that Fig. 5 provides for the embodiment of the present invention, on the basis of above-described embodiment, further, also antenna tuning circuit is comprised in this magnetic nuclear resonance analyzer, as shown in Figure 5, this antenna tuning circuit comprises radio-frequency relay 26 and multiple without magnetocapacitance 27.
Wherein, described antenna 25 two ends are connected to after respectively connecting without magnetocapacitance 27; The input end 261 of described radio-frequency relay 26 is connected with described field programmable gate array unit, and in described radio-frequency relay 26, each contact 262 of output terminal is described in parallel without magnetocapacitance 27 with each respectively; Described field programmable gate array unit 233 also generates switch controlling signal for the parameter information according to described measurement pattern, to control the closed of each contact 262 of output terminal in described radio-frequency relay 26 or to disconnect, thus be connected to described antenna 25 two ends by corresponding without magnetocapacitance 27.
The principle of work of this antenna tuning circuit is introduced below in conjunction with Fig. 5.
As shown in Figure 5, in this circuit, the output terminal of radio-frequency relay 26 comprises multiple contact 262, each contact 262 can be normally opened contact or normally closed contact, the input end of radio-frequency relay 26 can receive the switch controlling signal of field programmable gate array unit 233 generation, radio-frequency relay 26 can control the disconnection or closed of different contacts 262 according to the different switch controlling signals received, when a certain contact 262 closes, in parallel with this contact 262 will by short circuit without magnetocapacitance 27, when a certain contact 262 disconnects, in parallel with this contact 262 will be connected to the two ends of antenna 25 without magnetocapacitance 27, therefore, by controlling the closed of each contact 262 or off-state, different can be connected to antenna 25 two ends without magnetocapacitance 27.
Antenna is for receiving echoed signal, its equivalent electrical circuit comprises the inductance of series connection, resistance and the electric capacity with this inductance and resistor coupled in parallel, for dissimilar sample, the frequency of its echoed signal produced is also different, when receiving echoed signal by antenna, for the frequency and antenna avoiding echoed signal produces resonance, the correlation parameter of antenna can be changed, such as, the size of the inductance in equivalent electrical circuit, resistance or electric capacity.The effect of the antenna tuning circuit in the present embodiment is just this, by different are connected to antenna ends without magnetocapacitance, the size of the capacitance being connected to antenna ends can be changed, also the capacitance in the equivalent electrical circuit of antenna is just changed, and then, reach the object that the frequency of avoiding echoed signal and antenna produce resonance.
The structural representation of Q change-over circuit and buffer circuit in the magnetic nuclear resonance analyzer that Fig. 6 provides for the embodiment of the present invention, as shown in Figure 5, this magnetic nuclear resonance analyzer can also comprise Q change-over circuit 28 and buffer circuit 29.
Q change-over circuit 28 and buffer circuit 29 are connected to described antenna 25 two ends;
Two antiparallel first diode D1, the first resistance R1, the first transistor Q1, transistor seconds Q2, a second resistance R2 and two antiparallel second diode D2 is connected with in turn in Q change-over circuit 28, and the equal ground connection of one of them electrode of described the first transistor Q1 and transistor seconds Q2;
Buffer circuit 29 comprises the equal ground connection of one of them electrode being connected with the first switching tube K1, third transistor Q3, the 4th transistor Q4 and second switch pipe K2, described third transistor Q3 and the 4th transistor Q4 in turn;
Described the first transistor Q1, transistor seconds Q2, the first switching tube K1, third transistor Q3, the 4th transistor Q4 are connected with described field programmable gate array unit respectively with second switch pipe K2;
Wherein, described field programmable gate array unit also for the parameter information T.G Grammar control signal according to described measurement pattern, to control described the first transistor Q1, transistor seconds Q2, the first switching tube K1, third transistor Q3, the 4th transistor Q4 and second switch pipe K2 according to setting sequential turn-on or shutoff;
At described wherein one first diode D1, the first transistor Q1, transistor seconds Q2 and wherein under the equal conducting state of one second diode D2, the first resistance R1 and the second resistance R2 two ends with described antenna 25 in parallel; Under described first switching tube K1, third transistor Q3, the 4th transistor Q4 and the equal conducting state of second switch pipe K2, after the conducting resistance series connection of described first switching tube K1, third transistor Q3, the 4th transistor Q4 and second switch pipe K2, be parallel to described antenna 25 two ends.
Above-mentioned the first transistor, transistor seconds, third transistor and the 4th transistor can be the transistor such as triode, metal-oxide-semiconductor, first switching tube and second switch pipe can be the on-off circuit be made up of transistors such as two or more triode or metal-oxide-semiconductors, and the first transistor, transistor seconds, third transistor, the 4th transistor, the first switching tube and second switch pipe can according to setting sequential turn-on or shutoffs under changeover control signal controls.
In the present embodiment, be further 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 by antenna, first active antenna is needed to make antenna produce radio-frequency field, make sample generation nuclear magnetic resonance, then, the echoed signal produced after gathering sample nuclear magnetic resonance by antenna again, after excitation generation radio-frequency field is carried out to antenna, the radio-frequency field energy produced in antenna can exponentially form be decayed, ideally, after the radio-frequency field energy attenuation in antenna to zero, best by the effect of antenna collection echoed signal again, avoid the reception affected when going back remainder energy in antenna echoed signal.
In reality, radio-frequency field energy attenuation in antenna is to zero or very littlely need the regular hour, be designated as the very first time, this very first time is generally some microseconds, produce radio-frequency field from antenna and usually also have a few microsecond to the interval time producing echoed signal, this interval time was designated as the second time, for ensureing that antenna collects the good echoed signal of quality, under normal circumstances, by the very first time being made to be less than for the second time to the selection of antenna parameter.
In the present embodiment, the effect of Q change-over circuit can play the effect reducing the above-mentioned very first time, and as shown in Figure 6, the equivalent electrical circuit of antenna 25 comprises the inductance L of series connection, resistance r and the electric capacity C in parallel with this inductance L and resistance r.
After active antenna 25 generation makes the radio-frequency field of sample nuclear magnetic resonance, now, can control to make the first transistor Q1 and transistor seconds Q2 conducting, in antenna 25, radio-frequency field energy is in attenuation process, oscillating voltage will be produced, this oscillating voltage is the voltage signal of sine wave, when in antenna 25, dump energy is larger, this oscillating voltage is greater than the forward voltage of the first diode D1 and the second diode D2, two first diode D1 are respectively in positive half period and the negative half-cycle alternate conduction of sine wave, two second diode D2 are also respectively in positive half period and the negative half-cycle alternate conduction of sine wave, first resistance R1 and the second resistance R2 will be parallel to the two ends of antenna 25, the quality factor q of antenna 25 will reduce, in antenna, the radio-frequency field energy of 25 can flow into the earth through the first resistance R1 and the first transistor Q1, or flow into the earth through the second resistance R2 and transistor seconds Q2, therefore, the most of energy can released within very short time in antenna 25.
When the dump energy in 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, first diode D1 and the second diode D2 will turn off, this Q change-over circuit 28 is in open-circuit condition, energy in antenna 25 can not flow into the earth through the first resistance R1 and the first transistor Q1 again, or flows into the earth through the second resistance R2 and transistor seconds Q2.Now, the first switching tube K1 can be controlled, third transistor Q3, 4th transistor Q4 and second switch pipe K2 conducting, this first switching tube K1, third transistor Q3, the two ends of antenna 25 are connected in parallel on after the conducting resistance series connection formed after 4th transistor Q4 and second switch pipe K2 conducting, this conducting resistance and the first resistance R1 compare with the resistance of the second resistance R2 and are much smaller, therefore, the quality factor of antenna 25 reduce further, remaining fraction energy in antenna 25, the earth can be flowed into through the first switching tube K1 and third transistor Q3, or, the earth is flowed into through second switch pipe K2 and the 4th transistor Q4, can to release fast remaining fraction energy in antenna 25.
And, in generation radio-frequency (RF) pulse signal and above-mentioned antenna of releasing in most of energy process, control the first switching tube K1, third transistor Q3, the 4th transistor Q4 and second switch pipe K2 to turn off, be connected to avoid high-voltage radio-frequency pulse signal to enter in the circuit such as the first differential driver of antenna 25 rear end, instrumentation amplifier, the second amplifier.And during reception echoed signal, control the first switching tube K1 and second switch pipe K2 conducting, enter with the echoed signal making antenna 25 gather in the circuit such as the first differential driver, instrumentation amplifier, the second amplifier being connected to antenna 25 rear end, further to amplify this echoed signal, the process such as filtering.
Seen from the above description, above-mentioned Q change-over circuit can play the effect of radio-frequency field energy in antenna of releasing fast stage by stage, makes antenna better receive echoed signal, and, antenna can be reduced and gather time interval between each echoed signal, improve the efficiency of collection signal.High-voltage radio-frequency pulse signal and late-class circuit can be isolated by above-mentioned buffer circuit, avoid high-voltage radio-frequency pulse signal to the interference of late-class circuit.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a magnetic nuclear resonance analyzer slide unit, is characterized in that, comprising:
Main frame, described main frame is provided with without magnetic recording level platform, described without magnetic recording level platform for placing the magnet housings of magnetic nuclear resonance analyzer;
Sample holder, be fixedly connected on described without on magnetic recording level platform, described sample holder is for placing sample;
Driving mechanism, be arranged on described main frame, described driving mechanism is connected with the magnet housings of magnetic nuclear resonance analyzer, and described driving mechanism is for driving the movement of the magnet housings of described magnetic nuclear resonance analyzer with the relative position of the magnet housings and sample that change magnetic nuclear resonance analyzer;
Described driving mechanism comprises:
First belt pulley and the second belt pulley, be arranged at described without on magnetic recording level platform respectively, travelling belt is provided with between described first belt pulley and the second belt pulley, described travelling belt is connected with the magnet housings of magnetic nuclear resonance analyzer, and the magnet housings of described nuclear magnetic resonance analyser and to be describedly slidably connected without magnetic recording level platform;
Motor driver, is connected with stepper motor, for generating the control wave to stepper motor;
Stepper motor, the rotating shaft of described stepper motor is connected with described second belt pulley, the rotating shaft of described stepper motor rotates set angle according to described control wave, to drive described second belt pulley to drive described travelling belt to rotate, thus the magnet housings of magnetic nuclear resonance analyzer is driven to slide without on magnetic recording level platform described.
2. magnetic nuclear resonance analyzer slide unit according to claim 1, is characterized in that:
Described sample holder comprises two for H type support, and the predeterminable range of being separated by of H type support described in two is arranged at described without on magnetic recording level platform respectively;
Wherein, each described H type support comprises a horizontal gird and two vertical support bar, be fixed in described without on magnetic recording level platform bottom vertical support bar described in two respectively, described horizontal gird two ends are fixed in each vertical support bar respectively, and sample is set up on the horizontal gird of H type support described in two.
3. magnetic nuclear resonance analyzer slide unit according to claim 1, is characterized in that:
Described main frame comprises at least one supporting leg, is describedly fixed on described supporting leg without magnetic recording level platform;
Described supporting leg bottom is provided with horizontal panel, and described horizontal panel is for placing host computer in magnetic nuclear resonance analyzer, governor circuit and electronic processing circuit;
Described motor driver is fixed in the described bottom wall without magnetic recording level platform.
4. 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 1-3;
Wherein, described antenna is wound in glass reinforced plastic pipe outside surface, and described antenna is fixedly installed relative to described magnet, and is placed in the magnetic field of described magnet generation;
Described antenna, glass reinforced plastic pipe and magnet are all arranged in magnet housings, described magnet housings be positioned over described slide unit without on magnetic recording level platform, sample is through described glass reinforced plastic pipe and being positioned on sample holder.
5. magnetic nuclear resonance analyzer according to claim 4, is characterized in that, also comprise:
Host computer, for arranging the parameter information of measurement pattern to send governor circuit to, and the amplitude of echo transmitted governor circuit and phase information are resolved, to obtain fluid information in sample and hole information;
Governor circuit, be connected with described host computer, for generating step motion control signal to send motor driver to according to the parameter information of described measurement pattern, to control described motor driver according to the control wave of described step motion control signal generation to stepper motor, and generate pumping signal to send electronic processing circuit to, and the echoed signal after the electronic processing circuit process received is converted to digital signal send host computer to after obtaining the amplitude of echo and phase information;
Electronic processing circuit, be connected with antenna with described governor circuit respectively, the radio-frequency field making sample nuclear magnetic resonance is produced with active antenna for generating radio-frequency (RF) pulse signal according to the pumping signal received, and the echoed signal produced after the sample nuclear magnetic resonance of receiving antenna collection, after described echoed signal being processed, send governor circuit to.
6. magnetic nuclear resonance analyzer according to claim 5, it is characterized in that, described electronic processing circuit comprises:
Digital to analog converter, is connected with described governor circuit, and the pumping signal for being generated by governor circuit converts analog electrical signal to send optical coupling isolator to;
Optical coupling isolator, is connected between described digital to analog converter and transistor driver, for by digital to analog converter and transistor driver Phototube Coupling;
Isolating transformer, the primary side of described isolating transformer is connected with transistor driver, and the secondary side of described isolating transformer is connected with transistor circuit, for by transistor driver and transistor circuit electrical isolation;
Transistor driver, is connected with transistor circuit, and the analog electrical signal for being exported by optical coupling isolator carries out amplifying to generate drive control signal, and exports through the secondary side of isolating transformer;
DC power supplier, is connected with transistor circuit, for providing DC voltage for transistor circuit;
Transistor circuit, is connected with antenna, produces for the radio-frequency (RF) pulse signal according to drive control signal DC voltage being chopped into square the radio-frequency field making sample generation nuclear magnetic resonance with active antenna;
First differential driver, is connected with antenna, converts two-pass DINSAR echoed signal to for the echoed signal generated by the sample of antenna collection;
Instrumentation amplifier, be connected with described first differential driver by Shielded Twisted Pair, by Shielded Twisted Pair, described two-pass DINSAR echoed signal is transferred to described instrumentation amplifier, after described two-pass DINSAR echoed signal being amplified the first setting multiple by instrumentation amplifier, exports a road echoed signal;
Second level amplifier, is connected with described instrumentation amplifier, and the echoed signal for being exported by described instrumentation amplifier exports after amplifying the second setting multiple;
Programmable attenuator, is connected with described second level amplifier, exports for after the echoed signal attenuation settings amount that exported by described second level amplifier;
Two-stage amplifier, is connected with described programmable attenuator, and the echoed signal for being exported by described programmable attenuator exports after amplifying the 3rd setting multiple;
Bandpass filter, is connected with described two-stage amplifier, the component of signal of setpoint frequency in the echoed signal exported for suppressing described two-stage amplifier;
Second differential driver, is connected with described bandpass filter, and the echoed signal for described bandpass filter being exported converts two-pass DINSAR echoed signal to;
Differential receiver, is connected with described second differential driver by Shielded Twisted Pair, is transformed into a road echoed signal for the two-pass DINSAR echoed signal described second differential driver exported;
Frequency overlapped-resistable filter, is connected with described differential receiver, for filter described differential receiver export echoed signal in harmonic signal to send governor circuit to.
7. magnetic nuclear resonance analyzer according to claim 6, it is characterized in that, described governor circuit comprises:
Analog to digital conversion driver, is connected with described frequency overlapped-resistable filter, and the echoed signal for being exported by described frequency overlapped-resistable filter exports after converting the analog voltage signal of setpoint frequency and amplitude to;
Analog to digital converter, is connected with described analog to digital conversion driver, exports after the analog voltage signal for being exported by analog to digital conversion driver converts digital signal to;
Field programmable gate array unit, be connected with described analog to digital converter, digital signal for being exported by analog to digital converter carries out buffer memory, and generate step motion control signal to send motor driver to according to the parameter information through the decoded measurement pattern of digital signal processor, to control described motor driver according to the control wave of described step motion control signal generation to stepper motor, and generate pumping signal to send described digital to analog converter to;
Digital signal processor, be connected with digital to analog converter with described field programmable gate array unit, for decoding to the parameter information of described measurement pattern, and generate echo data and read signal to read the digital signal that stores in described field programmable gate array unit and to obtain the amplitude of echo and phase information to send host computer to according to preset algorithm.
8. magnetic nuclear resonance analyzer according to claim 7, is characterized in that, also comprise:
Antenna tuning circuit, described antenna tuning circuit comprises radio-frequency relay and multiple without magnetocapacitance;
Wherein, respectively described antenna ends is connected to without after magnetocapacitance series connection;
The input end of described radio-frequency relay is connected with described field programmable gate array unit, and in described radio-frequency relay, each contact of output terminal is described in parallel without magnetocapacitance with each respectively;
Described field programmable gate array unit also generates switch controlling signal for the parameter information according to described measurement pattern, to control the closed of each contact of output terminal in described radio-frequency relay or to disconnect, thus be connected to described antenna ends by corresponding without magnetocapacitance.
9. magnetic nuclear resonance analyzer according to claim 7 or 8, is characterized in that, also comprises
Q change-over circuit and buffer circuit, described Q change-over circuit and buffer circuit are connected to described antenna ends;
Two antiparallel first diodes, the first resistance, the first transistor, transistor seconds, the second resistance and two antiparallel second diodes are connected with in turn in described Q change-over circuit, and one of them electrode ground connection respectively of described the first transistor and transistor seconds;
Described buffer circuit comprises and is connected with the first switching tube, third transistor, the 4th transistor and second switch pipe in turn, the equal ground connection of one of them electrode of described third transistor and the 4th transistor;
Described the first transistor, transistor seconds, the first switching tube, third transistor, the 4th transistor are connected with described field programmable gate array unit respectively with second switch pipe;
Wherein, described field programmable gate array unit also for the parameter information T.G Grammar control signal according to described measurement pattern, to control described the first transistor, transistor seconds, the first switching tube, third transistor, the 4th transistor and second switch pipe according to setting sequential turn-on or shutoff;
At described wherein one first diode, the first transistor, transistor seconds and wherein under the equal conducting state of one second diode, the two ends of the first resistance and the second resistor coupled in parallel and described antenna; Under described first switching tube, third transistor, the 4th transistor and the equal conducting state of second switch pipe, after the conducting resistance series connection of described first switching tube, third transistor, the 4th transistor and second switch pipe, be parallel to described antenna ends.
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