CN102538945A - Cross-polarization control-based distributed vibration sensing system and method - Google Patents
Cross-polarization control-based distributed vibration sensing system and method Download PDFInfo
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- CN102538945A CN102538945A CN201210060029XA CN201210060029A CN102538945A CN 102538945 A CN102538945 A CN 102538945A CN 201210060029X A CN201210060029X A CN 201210060029XA CN 201210060029 A CN201210060029 A CN 201210060029A CN 102538945 A CN102538945 A CN 102538945A
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Abstract
The invention discloses a cross-polarization control-based distributed vibration sensing system, belonging to the technical field of distributed optical fiber vibration sense. The system comprises a light source, a polarization controller, an optical modulator, a coupler, a photoelectric receiving part, a data processing and control part. The system is mainly characterized in that the light source sends out a narrow-line width continuous linear polarization light, the light is divided into two beams by the coupler, and a polarization controller (PC) respectively controls the polarization state of the two linear polarization light, so that the linear polarization light is changed according to a certain period, and the polarization state of the two linear polarization light is orthogonal with each other. The cross-polarization light is injected into the sensing optical fiber through the coupler, the backscatter light of the cross-polarization light is received by the photoelectric receiving part, and the backscatter light is transmitted into the data processing and control part. The technical difficulties of a distributed vibration sensor such as unstable signal, higher sensitivity undulation and the like caused by polarization fading can be preferably solved.
Description
Technical field
The present invention relates to the optical fiber vibration sensing field, relate in particular to distributed vibration sensing system and method based on cross polarization control.
Background technology
Distributed fiberoptic sensor (DOFS) can also be gone up on the way at optical fiber and obtain the information of measured amount in time and space simultaneously except having radiationless interference, good, the good chemical stability of anti-interference.Optical fiber distributed type measuring technique principle mainly contains two big types: interference technique and OTDR technology.Interference technique mainly contains Sagnac formula interference technique, M-Z interference technique, Michelson interference technique.Can realize preceding two kinds of mainly containing of distributed measurement.OTDR kind rich, principle are mainly based on Rayleigh scattering, Brillouin scattering, Raman scattering, polarization state variation etc.Except common OTDR, also have ROTDR, BOTDR/BOTDA, POTDR, Φ-OTDR etc.In above measuring method; Φ-OTDR is through measuring the phase change of back to the Rayleigh scattering; And had the bearing accuracy advantages of higher in the highly sensitive of interference technique and the OTDR technology simultaneously, therefore in safety protection technique, become a kind of competitive selection.Based on the Φ-OTDR technology of ultra narrow bandwidth light source have detection sensitivity height, system signal handle simple, measuring speed is fast, accurate positioning, long, high, the low cost and other advantages of signal to noise ratio (S/N ratio) of measuring distance; But because relevant Rayleigh scattered signal is polarization correlated; The polarization decay phenomenon can appear in growing apart from Φ-OTDR system; Long more this polarization decay influence of distance is just serious more, can have a strong impact on the detection performance of Φ-OTDR system.But the polarization control technology that is applied to Φ-OTDR system at present is considerably less, does not also see the better method of head it off as yet, has hindered the development and the application of Φ-OTDR system.
Summary of the invention
In order to solve deficiency of the prior art, the present invention provides a kind of distributed vibration sensing system based on cross polarization control that can effectively solve the intrinsic polarization decay of distributed interference system, and the method for sensing of using above-mentioned sensor-based system.
The objective of the invention is to be achieved through following technical scheme:
Distributed vibration sensing system based on cross polarization control comprises light source, sensor fibre and detector; Said sensor-based system further comprises:
First coupling mechanism, said first coupling mechanism are used for first light path and second light path are advanced in the optically-coupled that said light source sends;
First Polarization Controller, said first polarizer are arranged on said first light path;
Second Polarization Controller, said second polarizer are arranged on said second light path;
Control module, said control module are used to make through the light of said first Polarization Controller and polarisation of light direction quadrature through said second Polarization Controller;
Second coupling mechanism, said second coupling mechanism are used for said sensor fibre is advanced in the optically-coupled on first light path, second light path, and the scattered light in the said sensor fibre is coupled into said detector;
Signal processing module, said signal processing module is handled the electric signal that said detector sends, thereby knows the extraneous vibration information of said sensor fibre perception.
According to above-mentioned sensor-based system, preferably, said light source is a light-pulse generator.
According to above-mentioned sensor-based system, alternatively, said sensor-based system further comprises:
Photomodulator, said photomodulator are used to make continuous light to be modulated to pulsed light;
Said second coupling mechanism further comprises:
The 3rd coupling mechanism, said the 3rd coupling mechanism are used for said photomodulator is advanced in the optically-coupled on said first light path, second light path;
The 4th coupling mechanism, said the 4th coupling mechanism is used for the pulsed light through said photomodulator is coupled into said sensor fibre, and the scattered light in the said sensor fibre is coupled into said detector;
Said light source is a continuous light source.
According to above-mentioned sensor-based system, preferably, said photomodulator is electricity-light or acousto-optic modulator.
According to above-mentioned sensor-based system, preferably, said light source is a laser instrument.
The object of the invention also is achieved through following technical scheme:
Based on the distributed vibration sensing method of cross polarization control, said method for sensing may further comprise the steps:
(A1) light that sends of light source is coupled into first light path and second light path;
(A2) the polarisation of light direction on adjustment first light path and second light path makes the polarization direction quadrature;
(A3) the two-way optically-coupled of polarization direction quadrature is advanced the sensor fibre of perception extraneous vibration, the scattered light on the sensor fibre is coupled into detector;
(A4) detector converts said scattered light into electric signal, and is sent to signal processing module;
(A5) signal processing module is handled said electric signal, thereby knows the extraneous vibration of said sensor fibre perception.
According to above-mentioned method for sensing, preferably, the light that said light source sends is pulsed light.
According to above-mentioned method for sensing, alternatively, said step (A3) further comprises the steps:
(B1) photomodulator is advanced in the two-way optically-coupled of polarization direction quadrature, light is modulated to pulsed light;
(B2) light that comes out from said photomodulator is coupled into said sensor fibre, and the scattered light on the said sensor fibre is coupled into said detector;
The light that said light source sends is continuous light.
According to above-mentioned method for sensing, preferably, said modulator is electricity-light or acousto-optic modulator.
According to above-mentioned method for sensing, preferably, said light source is a laser instrument.
Compared with prior art, the present invention has following beneficial effect:
The present invention adopts the cross polarization control technology; Through two Polarization Controllers light source output light is carried out Polarization Control; Solve intrinsic polarization decay phenomenon in Φ-OTDR system, for the development and production that realize reliable and stable Φ-OTDR system provide foundation and reference.
Description of drawings
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art are understood that easily: these accompanying drawings only are used to illustrate technical scheme of the present invention, and are not to be intended to protection scope of the present invention is constituted restriction.Among the figure:
Fig. 1 is the basic block diagram of the distributed vibration sensing system of the embodiment of the invention 1;
Fig. 2 is the process flow diagram of the distributed vibration sensing method of the embodiment of the invention 1;
Fig. 3 is the basic block diagram of the distributed vibration sensing system of the embodiment of the invention 2;
Fig. 4 is the process flow diagram of the distributed vibration sensing method of the embodiment of the invention 2.
Concrete embodiment
Fig. 1-4 and following declarative description optional embodiment of the present invention how to implement with instruction those skilled in the art and reproduce the present invention.In order to instruct technical scheme of the present invention, simplified or omitted some conventional aspects.Those skilled in the art should understand that the modification or the replacement that are derived from these embodiments will be within the scope of the invention.Those skilled in the art should understand that following characteristics can make up to form a plurality of modification of the present invention in every way.Thus, the present invention is not limited to following optional embodiment, and is only limited claim and their equivalent.
Embodiment 1:
Fig. 1 has schematically provided the basic block diagram based on the distributed vibration sensing system of cross polarization control of the embodiment of the invention, and as shown in Figure 1, said sensor-based system comprises light source (being preferably light-pulse generator), sensor fibre and detector; Said sensor-based system further comprises:
First Polarization Controller, said first polarizer are arranged on said first light path;
Second Polarization Controller, said second polarizer are arranged on said second light path;
Control module, said control module are used to make through the light of said first Polarization Controller and polarisation of light direction quadrature through said second Polarization Controller;
Second coupling mechanism 4, said second coupling mechanism 4 is used for said sensor fibre is advanced in the optically-coupled on first light path, second light path, and the scattered light in the said sensor fibre is coupled into said detector;
Signal processing module, said signal processing module is handled the electric signal that said detector sends, thereby knows the extraneous vibration information of said sensor fibre perception.
According to above-mentioned sensor-based system, preferably, said light source is a laser instrument.
Each device such as above-mentioned Polarization Controller, coupling mechanism, detector, photomodulator all is the state of the art, repeats no more at this.
Fig. 2 has schematically provided the process flow diagram based on the distributed vibration sensing method of cross polarization control of the embodiment of the invention, and as shown in Figure 2, said method for sensing may further comprise the steps:
(A1) light that sends of light source (being preferably light-pulse generator) is coupled into first light path and second light path;
(A2) the polarisation of light direction on adjustment first light path and second light path makes the polarization direction quadrature;
(A3) the two-way optically-coupled of polarization direction quadrature is advanced the sensor fibre of perception extraneous vibration, the scattered light on the sensor fibre is coupled into detector;
(A4) detector converts said scattered light into electric signal, and is sent to signal processing module;
(A5) signal processing module is handled said electric signal, thereby knows the extraneous vibration of said sensor fibre perception.
According to above-mentioned method for sensing, preferably, said modulator is electricity-light or acousto-optic modulator.
According to above-mentioned method for sensing, preferably, said light source is a laser instrument.
The benefit that reaches according to the embodiment of the invention 1 is: through the control of first and second Polarization Controllers; The pulsed light that injects sensor fibre is modulated into the mutually orthogonal two parts light of polarization state; Make that backscatter signal is unlikely to disappear just owing to polarization decay, but total energy keeps certain intensity.
Embodiment 2:
Fig. 3 has schematically provided the basic block diagram based on the distributed vibration sensing system of cross polarization control of the embodiment of the invention, and is as shown in Figure 3, and different with embodiment 1 is:
1, light source is a continuous light source;
2, sensor-based system further comprises:
Photomodulator, said photomodulator are used to make continuous light to be modulated to pulsed light; Preferably, said photomodulator is electricity-light or acousto-optic modulator;
Said second coupling mechanism further comprises:
The 3rd coupling mechanism 2, said the 3rd coupling mechanism 2 is used for said photomodulator is advanced in the optically-coupled on said first light path, second light path;
The 4th coupling mechanism 3, said the 4th coupling mechanism 3 is used for the pulsed light through said photomodulator is coupled into said sensor fibre, and the scattered light in the said sensor fibre is coupled into said detector.
Fig. 4 has schematically provided the process flow diagram based on the distributed vibration sensing method of cross polarization control of the embodiment of the invention, and what as shown in Figure 4 and embodiment 1 were different is:
1, light source is a continuous light source;
2, step (A3) further comprises the steps:
(B1) photomodulator is advanced in the two-way optically-coupled of polarization direction quadrature, light is modulated to pulsed light; Preferably, said photomodulator is electricity-light or acousto-optic modulator;
(B2) light that comes out from said photomodulator is coupled into said sensor fibre, and the scattered light on the said sensor fibre is coupled into said detector.
Embodiment 3:
According to sensor-based system among the embodiment 2 and the application examples of method in vibration survey.Light source adopts narrow linewidth continuous high power laser instrument, has extremely low phase noise and relative intensity noise.The modulation rate of first and second Polarization Controllers is greater than 1kHz.Adopt acousto-optic modulator (AOM), continuous light is modulated to pulsed light.
Claims (10)
1. based on the distributed vibration sensing system of cross polarization control, comprise light source, sensor fibre and detector; It is characterized in that: said sensor-based system further comprises:
First coupling mechanism, said first coupling mechanism are used for first light path and second light path are advanced in the optically-coupled that said light source sends;
First Polarization Controller, said first polarizer are arranged on said first light path;
Second Polarization Controller, said second polarizer are arranged on said second light path;
Control module, said control module are used to make through the light of said first Polarization Controller and polarisation of light direction quadrature through said second Polarization Controller;
Second coupling mechanism, said second coupling mechanism are used for said sensor fibre is advanced in the optically-coupled on first light path, second light path, and the scattered light in the said sensor fibre is coupled into said detector;
Signal processing module, said signal processing module is handled the electric signal that said detector sends, thereby knows the extraneous vibration information of said sensor fibre perception.
2. sensor-based system according to claim 1 is characterized in that: said light source is a light-pulse generator.
3. sensor-based system according to claim 1 is characterized in that: said sensor-based system further comprises:
Photomodulator, said photomodulator are used to make continuous light to be modulated to pulsed light;
Said second coupling mechanism further comprises:
The 3rd coupling mechanism, said the 3rd coupling mechanism are used for said photomodulator is advanced in the optically-coupled on said first light path, second light path;
The 4th coupling mechanism, said the 4th coupling mechanism is used for the pulsed light through said photomodulator is coupled into said sensor fibre, and the scattered light in the said sensor fibre is coupled into said detector;
Said light source is a continuous light source.
4. sensor-based system according to claim 3 is characterized in that: said photomodulator is electricity-light or acousto-optic modulator.
5. according to the arbitrary described sensor-based system of claim 1-4, it is characterized in that: said light source is a laser instrument.
6. based on the distributed vibration sensing method of cross polarization control, said method for sensing may further comprise the steps:
(A1) light that sends of light source is coupled into first light path and second light path;
(A2) the polarisation of light direction on adjustment first light path and second light path makes the polarization direction quadrature;
(A3) the two-way optically-coupled of polarization direction quadrature is advanced the sensor fibre of perception extraneous vibration, the scattered light on the sensor fibre is coupled into detector;
(A4) detector converts said scattered light into electric signal, and is sent to signal processing module;
(A5) signal processing module is handled said electric signal, thereby knows the extraneous vibration of said sensor fibre perception.
7. method for sensing according to claim 6 is characterized in that: the light that said light source sends is pulsed light.
8. method for sensing according to claim 6 is characterized in that: said step (A3) further comprises the steps:
(B1) photomodulator is advanced in the two-way optically-coupled of polarization direction quadrature, light is modulated to pulsed light;
(B2) light that comes out from said photomodulator is coupled into said sensor fibre, and the scattered light on the said sensor fibre is coupled into said detector;
The light that said light source sends is continuous light.
9. method for sensing according to claim 8 is characterized in that: said modulator is electricity-light or acousto-optic modulator.
10. according to the arbitrary described method for sensing of claim 6-9, it is characterized in that: said light source is a laser instrument.
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Cited By (5)
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| CN105004355A (en) * | 2015-07-15 | 2015-10-28 | 南京大学 | Phi-OTDR reinforcing method based on polarized orthogonal optical pulse pair and device thereof |
| CN107084713A (en) * | 2017-05-26 | 2017-08-22 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| CN107289978A (en) * | 2017-06-09 | 2017-10-24 | 南京大学 | A kind of system and method for the survey disturbance based on POTDR |
| CN107643120A (en) * | 2017-11-10 | 2018-01-30 | 武汉理工光科股份有限公司 | The distributed fiber Rayleigh of polarization decay is avoided to scatter vibration sensing system and method |
| US11512986B2 (en) | 2020-01-24 | 2022-11-29 | Nokia Solutions And Networks Oy | Fiber phase sensing using a ladder topology |
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| CN101639379A (en) * | 2009-08-26 | 2010-02-03 | 南京大学 | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107084713A (en) * | 2017-05-26 | 2017-08-22 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| CN107084713B (en) * | 2017-05-26 | 2019-08-06 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| CN107289978A (en) * | 2017-06-09 | 2017-10-24 | 南京大学 | A kind of system and method for the survey disturbance based on POTDR |
| CN107289978B (en) * | 2017-06-09 | 2019-05-07 | 南京大学 | A kind of system and method for the survey disturbance based on POTDR |
| CN107643120A (en) * | 2017-11-10 | 2018-01-30 | 武汉理工光科股份有限公司 | The distributed fiber Rayleigh of polarization decay is avoided to scatter vibration sensing system and method |
| US11512986B2 (en) | 2020-01-24 | 2022-11-29 | Nokia Solutions And Networks Oy | Fiber phase sensing using a ladder topology |
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