CN101963516A - Polarization-sensitive distributed perturbation sensing and measuring method and system - Google Patents
Polarization-sensitive distributed perturbation sensing and measuring method and system Download PDFInfo
- Publication number
- CN101963516A CN101963516A CN201010286857.6A CN201010286857A CN101963516A CN 101963516 A CN101963516 A CN 101963516A CN 201010286857 A CN201010286857 A CN 201010286857A CN 101963516 A CN101963516 A CN 101963516A
- Authority
- CN
- China
- Prior art keywords
- polarization
- beam apparatus
- balance
- photoelectric commutator
- polarization beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract 3
- 239000000835 fiber Substances 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000006303 photolysis reaction Methods 0.000 claims 1
- 230000015843 photosynthesis, light reaction Effects 0.000 claims 1
- 230000003068 static effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a polarization-sensitive distributed perturbation sensing method and a polarization-sensitive distributed perturbation sensing system. The better embodiment of the polarization-sensitive distributed perturbation sensing system comprises a function generator (1), a pulse laser (2), a polarization controller (3), a circulator (4), a sensing optical fiber (5), a polarization beam splitter (6), a balanced amplification photoelectric converter (7), a data acquisition unit (8) and a data processing unit (9), wherein the intensity of two paths of optical signals of which the polarization directions are vertical mutually is subjected to substraction by the balanced amplification photoelectric converter so as to obtain the intensity difference reflecting the change of the polarization state of the two paths of optical signals; and data acquired by a data acquisition module is detailedly analyzed to realize the sensitive monitoring on optical perturbation signals. The method has the advantage of improving the detection sensitivity of the sensing system greatly.
Description
Technical field
The present invention relates to a kind of optical fiber sensing system, relate in particular to a kind of Polarization-Sensitive distributed perturbation method for sensing and system based on polarization beam apparatus and balance amplification photoelectric commutator.
Background technology
Extraneous extruding, impact, vibration etc. all can cause the disturbance of optical fiber, and these perturbation meetings cause the variation of fiber birefringence axle and then cause the variation of the light signal polarization state of transmitting in the optical fiber.Utilize above-described polarization state variation characteristic just based on the moving optical fiber sensing system of Polarization-Sensitive distributed perturbation, come perception optical fiber whether to be subjected to external interference along the line by the polarization state of analyzing the Rayleigh scattering light signal that transmits dorsad in the optical fiber.
In the prior art, the measuring method of light signal polarization state has multiple, comprise analyzing meter method and based on the method for polarization beam apparatus and double detector, analyzing meter method is the variation of reacting polarization state through the light signal strength of analyzing meter by measuring, and the method can not make full use of the energy of tested light signal; Method based on polarization beam apparatus and double detector is to use polarization beam apparatus that tested light signal is divided into orthogonal two ways of optical signals, two ways of optical signals with polarization beam apparatus output is input to two photodetectors respectively then, gather the data of two paths of signals then respectively and do data processing respectively, though the method can make full use of the energy of light signal but need use two photodetectors because of system, structure is complicated, and data volume is big, the data processing time that needs is longer, causes the response time of system longer.Find after deliberation in addition after carrying out spectrum transformation, to cause the reason of measuring blind spot not to be because polarized light signal is zero with vertical this road light signal output intensity that causes of a polarization axle wherein based on Polarization-Sensitive distributed perturbation sensor, but because the polarization state that causes by perturbation change with change before compare very faintly, the method that therefore how to provide a kind of highly sensitive measurement polarization state to change is to optimize the problem that need solve based on Polarization-Sensitive distributed perturbation sensor-based system.
Summary of the invention
The purpose of this invention is to provide the method that a kind of highly sensitive measurement polarization state changes, and based on this method proposition a kind of Polarization-Sensitive distributed perturbation sensing measuring method and system, to overcome the deficiency of prior art scheme based on polarization beam apparatus and balance amplification photoelectric commutator.
Above-mentioned measuring method of amplifying the Polarization-Sensitive distributed perturbation optical fiber sensing system of photoelectric commutator based on polarization beam apparatus and balance of the present invention is meant the method that polarization state changes of measuring, technical scheme of the present invention is: a kind of Polarization-Sensitive distributed perturbation method for sensing, to in the sensor fibre or react optical fiber by a circulator to the polarization state measurement of the light signal of Rayleigh scattering dorsad that detectable signal produced of sensor fibre and whether be subjected to external interference along the line, at first use a polarization beam apparatus to be divided into mutually orthogonal two-way polarized light in the sensor fibre or through the tested rayleigh backscattering light signal of circulator output, then this two-way polarized light signal is imported balance respectively and amplified two input ports of photoelectric commutator, the polarization state that draws two ways of optical signals changes the poor of the light intensity that causes.Balance is amplified the output of photoelectric commutator (being the difference photo amplifier), and the polarization state that draws two ways of optical signals changes the poor of the light intensity that causes.
Device of the present invention is achieved through the following technical solutions: based on the Polarization-Sensitive distributed perturbation optical fiber sensing system of polarization beam apparatus and balance amplification photoelectric commutator, comprise: function generator 1, pulsed laser 2, Polarization Controller 3, circulator 4, sensor fibre 5, polarization beam apparatus 6, balance is amplified photoelectric commutator 7, data acquisition unit 8, data processing unit 9; Two synchronous triggering output ports of described function generator 1 connect respectively and trigger the input end of described pulsed laser 2 and the triggering input port of described data acquisition unit 8; The output terminal of described pulsed laser 2 connects the input end of described Polarization Controller 3; The output terminal of described Polarization Controller 3 connects described circulator 4 ports
The port of described circulator 4
Connect described sensor fibre 5; Described circulator 4 ports
The input end that connects described polarization beam apparatus 6; Two output ports of described polarization beam apparatus 6 connect two input ports that balance is amplified photoelectric commutator 7; Described balance is amplified the data acquisition input port of the output port connection data acquisition unit 8 of photoelectric commutator 7; The output terminal of described data acquisition unit 8 connects the input end of data processing unit 9.
The above-mentioned tested rayleigh backscattering flashlight of sensor fibre (or passing through circulator) being exported based on the photoelectric commutator of balance amplification described in the Polarization-Sensitive distributed perturbation optical fiber sensing system of polarization beam apparatus and amplification photoelectric commutator (balance photodetector) of the present invention subtracts each other through the intensity of the two-way polarized light signal of polarization beam apparatus (PBS) beam splitting gained, and the energy difference that makes full use of the polarization signal of two-way energy complement reacts the polarization state variation that extraneous perturbation brings.
As seen from the above technical solution provided by the invention, of the present invention based on the Polarization-Sensitive distributed perturbation sensor-based system of polarization beam apparatus and balance amplification photoelectric commutator and the method that the measurement polarization state changes thereof, the polarization state of using balance amplification photoelectric commutator that the intensity of two-way quadrature input optical signal is subtracted each other and obtaining changes the intensity difference that causes, utilizes data processing unit that the signal that is obtained by data acquisition is carried out analyzing and processing again.Can realize Sensitive Detection to optical fiber perturbation signal.
The invention has the beneficial effects as follows: propose the method that a kind of highly sensitive measurement polarization state changes, and based on a kind of Polarization-Sensitive distributed perturbation sensing measurement system of this method proposition based on polarization beam apparatus and balance amplification photoelectric commutator, overcome the deficiency of prior art scheme, with compare based on the method for polarization beam apparatus and double detector, the present invention has simplified system and has saved cost; Compare with analyzing meter method, the present invention can improve 3dB with the measurable dynamic range of system, the detectable minimum energy of system can have been improved 3dB again simultaneously.
Description of drawings
Fig. 1 is an analyzing meter method schematic diagram of measuring polarization state in the prior art
Fig. 2 is the method schematic diagram based on polarization beam apparatus and double detector of measuring polarization state in the prior art
Fig. 3 is the method block diagram based on polarization beam apparatus and balance amplification photoelectric commutator of the measurement polarization state among the present invention
Fig. 4 is the structured flowchart of the optical fiber perturbation sensor-based system among the present invention.
Embodiment
Describe preferred embodiment of the present invention in detail below in conjunction with accompanying drawing.
Polarization-Sensitive distributed perturbation optical fiber sensing system based on polarization beam apparatus and balance amplification photoelectric commutator of the present invention, its preferable embodiment as shown in Figure 4, comprise function generator 1, pulsed laser 2, Polarization Controller 3, circulator 4, sensor fibre 5, polarization beam apparatus 6, balance is amplified photoelectric commutator 7, data acquisition unit 8, data processing unit 9.
Concrete implementation step when the present invention is used to monitor is as follows:
1) described function generator 1 sends two synchronous triggering signals and is respectively applied for described pulsed laser 2 of triggering and described data acquisition unit 8.
2) the direct impulse light signal of described pulsed laser 2 outputs passes through described Polarization Controller 3, described circulator 4
,
Port enters described sensor fibre 5.
3) light of Rayleigh scattering signal dorsad that produces in described sensor fibre 5 of described direct impulse light is through described circulator 4
,
Port enters described polarization beam apparatus 6.
4) described polarization beam apparatus 6 is with after Rayleigh scattering signal light is divided into orthogonal two polarization modes dorsad, and two output ports through described polarization beam apparatus 6 enter two input ports that described balance is amplified photoelectric commutator 7 respectively.
5) described balance is amplified photoelectric commutator 7 and described two input polarization light intensities is subtracted each other and be converted to the output port that electric signal amplifies photoelectric commutator 7 through described balance and arrive described data acquisition unit 8.
6) data of described data acquisition unit 8 acquisitions are passed to described data processing unit 9 and are done the post analysis processing.
Above embodiment only is a better embodiment of the present invention, but protection scope of the present invention is not limited thereto, and does not break away from any modification and local replacement of spirit and scope of the invention, all should be encompassed within protection scope of the present invention.
Claims (8)
1. Polarization-Sensitive distributed perturbation method for sensing, it is characterized in that in the sensor fibre or react optical fiber by a circulator to the polarization state measurement of the light signal of Rayleigh scattering dorsad that detectable signal produced of sensor fibre and whether be subjected to external interference along the line, at first use a polarization beam apparatus to be divided into mutually orthogonal two-way polarized light in the sensor fibre or through the tested rayleigh backscattering light signal of circulator output, then this two-way polarized light signal is imported balance respectively and amplified two input ports of photoelectric commutator, the polarization state that draws two ways of optical signals changes the poor of the light intensity that causes.
2. the Polarization-Sensitive distributed perturbation method for sensing based on polarization beam apparatus and balance amplification photoelectric commutator according to claim 1 is characterized in that the monitoring step of described sensor-based system comprises:
1) described function generator (1) sends two synchronous triggering signals and is respectively applied for triggering described pulsed laser (2) and described data acquisition unit (8);
2) the direct impulse light signal of described pulsed laser 2 outputs enters described sensor fibre (5) through two ports of described Polarization Controller 3, described circulator (4);
3) light of Rayleigh scattering signal dorsad that produces in described sensor fibre (5) of described direct impulse light enters described polarization beam apparatus (6) through other two ports of described circulator (4);
4) described polarization beam apparatus (6) is with after Rayleigh scattering signal light is divided into orthogonal two polarization modes dorsad, and two output ports through described polarization beam apparatus (6) enter two input ports that described balance is amplified photoelectric commutator (7) respectively;
5) described balance is amplified photoelectric commutator (7) and described two input polarization light intensities is subtracted each other and be converted to the output port that electric signal amplifies photoelectric commutator (7) through described balance and arrive described data acquisition unit (8);
6) data of described data acquisition unit (8) acquisition are passed to described data processing unit (9) and are done the post analysis processing.
3. the Polarization-Sensitive distributed perturbation method for sensing based on polarization beam apparatus and balance amplification photoelectric commutator according to claim 2, one of them of two synchronous triggering signals that it is characterized in that described function generator (1) output is used to trigger the trigger pip of described data acquisition unit (8), the passage that uses described data acquisition unit 8 also can not use any trigger pip from trigger pip.
4. describedly amplify the Polarization-Sensitive distributed perturbation method for sensing of photoelectric commutator according to claim 2 or 3, it is characterized in that described polarization beam apparatus (6) is with monitoring step 4 based on polarization beam apparatus and balance) photolysis of described Rayleigh scattering signal dorsad is the orthogonal flashlight of two-way polarization mode.
5. describedly amplify the Polarization-Sensitive distributed perturbation method for sensing of photoelectric commutator according to claim 2 or 3, it is characterized in that the data-signal that described data processing unit (9) is adopted described data acquisition unit (8) does analyzing and processing based on polarization beam apparatus and balance.
6. according to claim 2 or 3 described Polarization-Sensitive distributed perturbation method for sensing based on polarization beam apparatus and balance amplification photoelectric commutator, it is characterized in that described data processing unit (9) carries out the time-domain analysis processing if then tackle signal after the no nonzero frequency of frequency-region signal discovery when signal being carried out the frequency-domain analysis processing, be about to described time-domain signal and original time-domain signal compares, if exist polarization state to change, illustrate that then described sensor fibre is subjected to extraneous extruding to wait the interference of static stress.
7. Polarization-Sensitive distributed perturbation sensor-based system, it is characterized in that, comprise function generator (1), pulsed laser (2), Polarization Controller (3), circulator (4), sensor fibre (5), polarization beam apparatus (6), balance is amplified photoelectric commutator (7), data acquisition module (8), data processing module (9); Two synchronous triggering output ports of described function generator (1) connect respectively and trigger the input end of described pulsed laser (2) and the triggering input port of described data acquisition unit (8); The output terminal of described pulsed laser (2) connects the input end of described Polarization Controller (3); The output terminal of described Polarization Controller (3) connects described circulator (4) port
The port of described circulator (4)
Connect described sensor fibre (5); Described circulator (4) port
The input end that connects described polarization beam apparatus (6); Two output ports of described polarization beam apparatus (6) connect two input ports that balance is amplified photoelectric commutator (7); Described balance is amplified the data acquisition input port of the output port connection data acquisition unit (8) of photoelectric commutator (7); The output terminal of described data acquisition unit (8) connects the input end of data processing unit (9).
8. the Polarization-Sensitive distributed perturbation sensor-based system based on polarization beam apparatus and balance amplification photoelectric commutator according to claim 7 is characterized in that two output ports of described polarization beam apparatus (6) link to each other with two input ports of described balance amplification photoelectric commutator (7) respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010102868576A CN101963516B (en) | 2010-09-20 | 2010-09-20 | Polarization-sensitive distributed perturbation sensing and measuring method and system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010102868576A CN101963516B (en) | 2010-09-20 | 2010-09-20 | Polarization-sensitive distributed perturbation sensing and measuring method and system |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101963516A true CN101963516A (en) | 2011-02-02 |
CN101963516B CN101963516B (en) | 2012-06-27 |
Family
ID=43516488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2010102868576A Expired - Fee Related CN101963516B (en) | 2010-09-20 | 2010-09-20 | Polarization-sensitive distributed perturbation sensing and measuring method and system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN101963516B (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102809421A (en) * | 2011-06-01 | 2012-12-05 | 电子科技大学 | Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection |
CN104833378A (en) * | 2015-03-06 | 2015-08-12 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
CN106248213A (en) * | 2016-08-03 | 2016-12-21 | 电子科技大学 | A kind of method and system of distributed measurement optical fiber polarisation transmission matrix |
CN106683310A (en) * | 2017-03-15 | 2017-05-17 | 河南理工大学 | Laser alarm for preventing conventional optical interference |
CN108507760A (en) * | 2018-05-31 | 2018-09-07 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of high-voltage convertor station energy-transmission optic fibre link state on-line measuring device |
CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
CN110595737A (en) * | 2019-08-22 | 2019-12-20 | 南京大学 | Optical characteristic measuring system and measuring method for micro-area |
CN114993448A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
CN114993447A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Distributed regional disturbance monitoring device and disturbance monitoring method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5164587A (en) * | 1991-09-09 | 1992-11-17 | Harbor Branch Oceanographic Institution, Inc. | Polarimetric parameter measurement systems and methods for measuring a plurality of parameters |
US5574553A (en) * | 1994-12-27 | 1996-11-12 | The United States Of America As Represented By The Secretary Of The Air Force | Ladar receiver incorporating an optical amplifier and polarization optical mixer |
CN101324441A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Control system of Mach-Zehnder optical fiber interferometer polarization decline and phase decline |
CN101344452A (en) * | 2008-08-22 | 2009-01-14 | 北京交通大学 | Method and device for implementing polarization sensitive optical time domain reflection technology by using piezoelectric ceramic |
CN101464166A (en) * | 2009-01-08 | 2009-06-24 | 北京航空航天大学 | Optical fiber distributed perturbation sensor and method for implementing perturbation positioning |
-
2010
- 2010-09-20 CN CN2010102868576A patent/CN101963516B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5164587A (en) * | 1991-09-09 | 1992-11-17 | Harbor Branch Oceanographic Institution, Inc. | Polarimetric parameter measurement systems and methods for measuring a plurality of parameters |
US5574553A (en) * | 1994-12-27 | 1996-11-12 | The United States Of America As Represented By The Secretary Of The Air Force | Ladar receiver incorporating an optical amplifier and polarization optical mixer |
CN101324441A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Control system of Mach-Zehnder optical fiber interferometer polarization decline and phase decline |
CN101344452A (en) * | 2008-08-22 | 2009-01-14 | 北京交通大学 | Method and device for implementing polarization sensitive optical time domain reflection technology by using piezoelectric ceramic |
CN101464166A (en) * | 2009-01-08 | 2009-06-24 | 北京航空航天大学 | Optical fiber distributed perturbation sensor and method for implementing perturbation positioning |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102809421A (en) * | 2011-06-01 | 2012-12-05 | 电子科技大学 | Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection |
CN104833378A (en) * | 2015-03-06 | 2015-08-12 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
CN104833378B (en) * | 2015-03-06 | 2017-05-17 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
CN106248213A (en) * | 2016-08-03 | 2016-12-21 | 电子科技大学 | A kind of method and system of distributed measurement optical fiber polarisation transmission matrix |
CN106248213B (en) * | 2016-08-03 | 2017-12-26 | 电子科技大学 | A kind of method and system of distributed measurement optical fiber polarisation transmission matrix |
CN106683310B (en) * | 2017-03-15 | 2022-03-08 | 河南理工大学 | Anti-interference laser alarm |
CN106683310A (en) * | 2017-03-15 | 2017-05-17 | 河南理工大学 | Laser alarm for preventing conventional optical interference |
CN108507760A (en) * | 2018-05-31 | 2018-09-07 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of high-voltage convertor station energy-transmission optic fibre link state on-line measuring device |
CN109724634B (en) * | 2018-12-29 | 2022-01-18 | 武汉光谷互连科技有限公司 | Optical coherent receiving method with automatic polarization equalization |
CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
CN110595737A (en) * | 2019-08-22 | 2019-12-20 | 南京大学 | Optical characteristic measuring system and measuring method for micro-area |
CN114993448A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
CN114993447A (en) * | 2022-06-09 | 2022-09-02 | 西北大学 | Distributed regional disturbance monitoring device and disturbance monitoring method |
CN114993447B (en) * | 2022-06-09 | 2023-03-10 | 西北大学 | Distributed regional disturbance monitoring device and disturbance monitoring method |
CN114993448B (en) * | 2022-06-09 | 2023-04-07 | 西北大学 | Long-distance distributed vibration monitoring device and monitoring method |
Also Published As
Publication number | Publication date |
---|---|
CN101963516B (en) | 2012-06-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101963516B (en) | Polarization-sensitive distributed perturbation sensing and measuring method and system | |
CN102168953B (en) | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection | |
CN103323040B (en) | A kind of many reference amounts distribution type optical fiber sensing equipment | |
CN102147236B (en) | Fully distributed optical fiber strain and vibration sensing method and sensor | |
CN105699050B (en) | Merge the compound distributing optical fiber sensing method and system of chaos light source and coherent detection | |
CN204027726U (en) | A kind of distributed optical fiber sensing system based on Brillouin scattering | |
CN105067103A (en) | Vibration detection device and method based on optical frequency domain reflectometer | |
CN106404215A (en) | Design of distributed fiber sensing system based on Brillouin scattering | |
CN105222816B (en) | Multi-parameter distributed optical fiber sensing system based on modulation pulse and multiple scattering | |
CN102937416A (en) | Fully-distributed optical fiber strain and vibration sensing method and device based on cross-polarization state changeover | |
CN104296783A (en) | Sensor detecting method and device for enhanced coherent optical time domain reflection | |
CN106153089A (en) | A kind of distributed optical fiber sensing system | |
US20180143067A1 (en) | Fiber optic acoustic wave detection system | |
CN113721287B (en) | Monitoring method and device based on sensing optical fiber | |
CN102607736B (en) | A kind of fiber grating combines the sensing arrangement of brillouin scattering signal detection | |
CN111780859A (en) | Distributed optical fiber sensing detection system | |
CN107664515B (en) | Optical fiber perimeter sensing positioning system and method for judging position of intrusion and disturbance point | |
CN112833929A (en) | Disturbance monitoring system of heterodyne phi-OTDR technology based on local optical frequency shift | |
CN105388125A (en) | Optical detection system for carbon monoxide concentration | |
CN107436201A (en) | Distributed fiber optic temperature strain sensing system and method based on Brillouin scattering | |
CN205120239U (en) | Vibration detection device based on optical frequency domain reflectometer | |
CN211740563U (en) | Optical time domain reflectometer | |
CN212391107U (en) | Distributed optical fiber sensing detection system | |
CN102692268B (en) | Distributed optical fiber vibration sensor for structural vibration detection | |
CN103994975B (en) | A kind of gas detection method based on this locality demodulation modulation optical signal technologies and device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20140920 |
|
EXPY | Termination of patent right or utility model |