CN102175302A - Novel distributed optical fiber vibration sensing system - Google Patents
Novel distributed optical fiber vibration sensing system Download PDFInfo
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- CN102175302A CN102175302A CN2010106191150A CN201010619115A CN102175302A CN 102175302 A CN102175302 A CN 102175302A CN 2010106191150 A CN2010106191150 A CN 2010106191150A CN 201010619115 A CN201010619115 A CN 201010619115A CN 102175302 A CN102175302 A CN 102175302A
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Abstract
The invention discloses a novel distributed optical fiber vibration sensing system. A white-light interferometer consisting of an optical fiber coupler and a delay optical fiber is introduced on the basis of the conventional optical fiber vibration sensing system, so that the requirement on the system for a light source part is greatly lowered, the measuring accuracy is enhanced, and the production cost is lowered.
Description
Technical field
The present invention relates to the distributed optical fiber vibration sensing technical field, especially design the white light interference technique of distributed optical fiber vibration sensing system.
Background technology
Distributed optical fiber vibration sensing system (RDVS) is a kind of distributed optical fiber vibration system based on Rayleigh scattering.On the one hand, when the narrow linewidth pulsed light transmits, can produce Rayleigh scattering signal in sensor fibre, wherein dorsad transmission be backscatter signals, and can interfere between the backscatter signals of synchronous transmission; On the other hand, the vibration of scattering position can change the phase place of scattered light directly or indirectly based on elasto-optical effect, causes interference signal to change.By to the reception of interference light signal with handle the distributed measurement that just can realize vibration signal.
Conventional RD VS technology is a kind of optical fiber sensing technology based on the interference of light, and system source is had very high requirement, particularly spectral width (kHz～MHz), spectrum stability, high-power, burst pulse etc.Whether spectral width is directly connected to system can detect vibration signal, and spectrum stability then is directly connected to system signal noise ratio, and large power narrow pulse is to realize that the OTDR technology is indispensable.For this reason, light source has become a bottleneck technology of conventional RD VS technology, is mainly reflected in two aspects, and the one, technical, the one, on the cost.At present, adopt the mode of narrow linewidth jointed fiber laser instrument, acousto-optic modulator and fiber amplifier combination usually, to realize the requirement of RDVS light source narrow linewidth, high-power, burst pulse.This has increased system complex degree and cost greatly.
Summary of the invention
In order to solve the problem that exists in the above-mentioned technology, the present invention relates to a kind of new distribution type optical fiber vibration sensing system.
The technical solution used in the present invention is: a kind of new distribution type optical fiber vibration sensing system, comprise distributed optical fiber vibration sensing main frame and sensor fibre, it is characterized in that: be provided with fiber coupler in the described optical fiber vibration sensing main frame and postpone the white light interferometer that optical fiber is built.
Described distributed optical fiber vibration sensing main frame comprises: light-pulse generator, receiver module, acquisition module, processing and control module and white light interferometer.
Described fiber coupler can be two 2 * 2 fiber couplers, also can be one 3 * 3 fiber coupler.
Described light-pulse generator is a kind of common burst pulse high power light source, and its spectrum is usually in the nm level, and spectrum stability requires general.After the pulsed light that described light-pulse generator is sent passes through the white light differential interference instrument of being made up of fiber coupler and delay optical fiber, can form two delayed pulses and enter sensor fibre respectively, produce accordingly Rayleigh scattering light dorsad, understand some behind the Rayleigh scattering light signal process white light differential interference instrument dorsad and can form interference, receive interference signal by receiver module and acquisition module, and the interference signal that receives is handled and analyzed, thereby obtain sensor fibre by signal Processing and control module
The present invention is owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and good effect: key of the present invention is to introduce white light differential interference instrument on conventional RD VS basis, thereby greatly reduce the requirement of system to the Lights section, improve measuring accuracy, reduced production cost.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
Further specify concrete implementation step of the present invention below in conjunction with accompanying drawing.
Embodiment 1: a kind of new distribution type optical fiber vibration sensing system as shown in Figure 1, comprises distributed optical fiber vibration sensing main frame and sensor fibre 5.The inner structure of distributed optical fiber vibration sensing main frame is: light-pulse generator 1 links to each other with 2 * 2 fiber couplers 2, two ports of 2 * 2 fiber couplers 2 and 2 * 2 fiber couplers 3 link to each other with delay optical fiber 4 by ordinary optic fibre respectively, the output terminal of 2 * 2 fiber couplers 3 links to each other with sensor fibre 5, the another port of 2 * 2 fiber couplers 2 connects receiver module 6, receiver module 6 links to each other with acquisition module 7, acquisition module 7 links to each other with processing and control module 8, and the synchronization pulse that light-pulse generator 1 is sent is connected to acquisition module 7.
The light pulse that light-pulse generator 1 is sent is respectively according to route a-b-c-d and a-f-c-d, through 2 * 2 fiber couplers, 2,2 * 2 fiber couplers 3 and delay optical fiber 4,1. and 2. form two respectively and postpone light pulses, successively enter sensor fibre 5, and produce separately the back respectively to Rayleigh scattering light.Wherein, according to route d-e-f-g transmission by afterwards can interfering at receiver module 6 places that 1. light pulse produces to Rayleigh scattering light with according to the Rayleigh scattering light dorsad that 2. produces by light pulse of route d-c-b-g transmission, receiver module 6 constantly receives and amplifies these interference signals.In addition, light-pulse generator 1 with send that light pulse differs fixed intervals constantly send a synchronizing signal sometime, this synchronizing signal starts acquisition module 7, acquisition module 7 with this synchronizing signal as timeorigin, receiver module 6 is received the interference signal that amplifies be converted into the digitizing sequence, pass through the processing of signal Processing and control module 8 again, we just can obtain the vibration distribution signal of sensor fibre 5 environment of living in.
Embodiment 2: a kind of new distribution type fiber-optic vibration passes system, goes into shown in Figure 2: comprise distributed optical fiber vibration sensing main frame and sensor fibre 5.The inner structure of distributed optical fiber vibration sensing main frame is: light-pulse generator 1 links to each other with 3 * 3 fiber couplers 9, a port of 3 * 3 fiber couplers, 9 both sides links to each other by postponing optical fiber 4, the output terminal of 3 * 3 fiber couplers 9 links to each other with sensor fibre 5, the 3rd input port of 3 * 3 fiber couplers 9 connects receiver module 6, receiver module 6 links to each other with acquisition module 7, acquisition module 7 links to each other with processing and control module 8, and the synchronization pulse that light-pulse generator 1 is sent is connected to acquisition module 7.
1. and 2. the light pulse that light-pulse generator 1 is sent is respectively according to route a-b and a-c-d-b, through coupling mechanism 9 and postpone optical fiber 4, forms two respectively and postpones light pulses, successively enters sensor fibre 5, and produces separately the back respectively to Rayleigh scattering light.Wherein, can interfere at receiver module 6 places according to the Rayleigh scattering light dorsad that is 1. produced by light pulse of route b-d-c-e transmission with according to the Rayleigh scattering light dorsad that is 2. produced by light pulse of route b-e transmission, receiver module 6 constantly receives and amplifies these scattered signals.In addition, light-pulse generator 1 with send that light pulse differs fixed intervals constantly send a synchronizing signal sometime, this synchronizing signal starts acquisition module 7, acquisition module 7 with this synchronizing signal as timeorigin, receiver module 6 is received the interference signal that amplifies be converted into the digitizing sequence, pass through the processing of signal Processing and control module 8 again, we just can obtain the vibration distribution signal of sensor fibre 5 environment of living in.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (4)
1. a new distribution type optical fiber vibration sensing system comprises distributed optical fiber vibration sensing main frame and sensor fibre, it is characterized in that: be provided with fiber coupler in the described optical fiber vibration sensing main frame and postpone the white light interferometer that optical fiber is built.
2. a kind of new distribution type optical fiber vibration sensing system according to claim 1 is characterized in that: described optical fiber vibration sensing main frame also comprises light-pulse generator, receiver module, and acquisition module is handled and control module.
3. a kind of new distribution type optical fiber vibration sensing system according to claim 1, it is characterized in that: annexation is in the described optical fiber vibration sensing main frame, two 2 * 2 fiber couplers link to each other with delay optical fiber by ordinary optic fibre, light-pulse generator links to each other with the input end of one 2 * 2 fiber coupler, and another input end of this 2 * 2 fiber coupler links to each other with receiver module; The output terminal of another 2 * 2 fiber coupler links to each other with sensor fibre, and receiver module links to each other with acquisition module, and acquisition module links to each other with processing and control module, and the synchronization pulse that light-pulse generator is sent is connected to acquisition module.
4. a kind of new distribution type optical fiber vibration sensing system according to claim 1, it is characterized in that: annexation is in the described optical fiber vibration sensing main frame, light-pulse generator links to each other with 3 * 3 fiber couplers, a port of 3 * 3 fiber coupler both sides links to each other by postponing optical fiber, the output terminal of 3 * 3 fiber couplers links to each other with sensor fibre, the 3rd input port of 3 * 3 fiber couplers connects receiver module, receiver module links to each other with acquisition module, acquisition module links to each other with processing and control module, and the synchronization pulse that light-pulse generator is sent is connected to acquisition module.
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| CN101216976A (en) * | 2008-01-10 | 2008-07-09 | 复旦大学 | An optical fiber perimeter security-monitoring system and the corresponding implementation method based on phase generated carrier reusing |
| US7488929B2 (en) * | 2003-08-13 | 2009-02-10 | Zygo Corporation | Perimeter detection using fiber optic sensors |
| CN101566497A (en) * | 2009-04-29 | 2009-10-28 | 上海华魏光纤传感技术有限公司 | Distribution-type fiber vibration sensor system based on phase detection and optical time domain reflection |
| CN201522765U (en) * | 2009-09-10 | 2010-07-07 | 上海八运水科技发展有限公司 | Optical fiber intrusion alarm system |
| CN201594154U (en) * | 2010-02-10 | 2010-09-29 | 中国航天空气动力技术研究院 | Whisker non-metal vibration sensing optical cable |
| CN201983852U (en) * | 2010-12-29 | 2011-09-21 | 上海华魏光纤传感技术有限公司 | Novel distribution type optical fiber vibration sensing system |
-
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- 2010-12-29 CN CN2010106191150A patent/CN102175302A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7488929B2 (en) * | 2003-08-13 | 2009-02-10 | Zygo Corporation | Perimeter detection using fiber optic sensors |
| CN101216976A (en) * | 2008-01-10 | 2008-07-09 | 复旦大学 | An optical fiber perimeter security-monitoring system and the corresponding implementation method based on phase generated carrier reusing |
| CN101566497A (en) * | 2009-04-29 | 2009-10-28 | 上海华魏光纤传感技术有限公司 | Distribution-type fiber vibration sensor system based on phase detection and optical time domain reflection |
| CN201522765U (en) * | 2009-09-10 | 2010-07-07 | 上海八运水科技发展有限公司 | Optical fiber intrusion alarm system |
| CN201594154U (en) * | 2010-02-10 | 2010-09-29 | 中国航天空气动力技术研究院 | Whisker non-metal vibration sensing optical cable |
| CN201983852U (en) * | 2010-12-29 | 2011-09-21 | 上海华魏光纤传感技术有限公司 | Novel distribution type optical fiber vibration sensing system |
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Application publication date: 20110907 |