CN102735272A - Barrier-searchable Brillouin optical time domain analyzer - Google Patents
Barrier-searchable Brillouin optical time domain analyzer Download PDFInfo
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- CN102735272A CN102735272A CN2012101896370A CN201210189637A CN102735272A CN 102735272 A CN102735272 A CN 102735272A CN 2012101896370 A CN2012101896370 A CN 2012101896370A CN 201210189637 A CN201210189637 A CN 201210189637A CN 102735272 A CN102735272 A CN 102735272A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 55
- 239000013307 optical fiber Substances 0.000 claims abstract description 60
- 230000004888 barrier function Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 description 13
- 238000012544 monitoring process Methods 0.000 description 9
- 230000007257 malfunction Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000253 optical time-domain reflectometry Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
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Abstract
The invention discloses a barrier-searchable Brillouin optical time domain analyzer comprising a Brillouin optical time domain analyzing module, a detection optical fiber, an optical fiber barrier searching module and a branching unit module, wherein the branching unit module is provided with two optical signal input ports and one optical signal output port; the first output port of the Brillouin optical time domain analyzing module and the optical fiber barrier searching module are respectively connected with the two input ports of the branching unit module; the first output port of the Brillouin optical time domain analyzing module is connected with an input port of the detection optical fiber; and the optical signal output port of the branching unit module is connected with the optical signal input port of the detection optical fiber. The device disclosed by the invention has a simple structure and can accurately detect the position of a breaking point of the optical fiber when the optical fiber is broken.
Description
Technical field
The present invention relates to a kind of optical fiber Brillouin optical time-domain analyzer, especially relate to a kind of barrier Brillouin optical time domain analysis appearance of seeking.
Background technology
Fibre Optical Sensor is compared with conventional sensors as the novel sensing technology that the seventies grows up, and has many good qualities: anti-electromagnetic interference (EMI), and electrical isolation, corrosion-resistant, highly sensitive, in light weight, volume is little, shape variable, cost is low etc.And at sensory field of optic fibre; Distributed Fibre Optical Sensor has made full use of the characteristics of optical fiber one-dimensional space continuous distribution; Can measure optical fiber exactly and go up measured (temperature, stress, vibration) information distribution on time and space of any point along the line, can accomplish perception, remote monitoring and monitoring are carried out as people's nervous system in each position of large foundation job facilities.
Brillouin optical time domain analysis appearance (BOTDA) development in recent years based on optical fiber Brillouin scattering enlarge-effect principle is rapid; This type sensor is realized the measurement of distributed sensor to various parameters through the frequency shift amount of the relative incident light of each position stimulated Brillouin scattering light of detection fiber; Its advantage is that the dynamic range of measuring is big, and precision is high.But because light signal that detector received is that light source by the other end sends in the Brillouin optical time domain analysis appearance; After detection optical fiber ruptures; The light that light source sends can't arrive detector; Therefore, the Brillouin optical time domain analysis appearance not only can't the detection fiber breakpoint, and can't operate as normal.Brillouin light time-domain reflectomer (BOTDR) is though possess the function of optical fiber being carried out distributed sensing and fault detect simultaneously, and the intensity of its Brillouin's backscattering is extremely faint, and the precision of measurement can not show a candle to the Brillouin optical time domain analysis appearance.Application number is that 201010229974.9 patent discloses a kind of optical fiber that in loop shape Fibre Optical Sensor, adds and seeks the device of barrier function; Adopt a plurality of photoswitches to control Fibre Optical Sensor and the duty of seeking the barrier module, comparatively complicated but a maximum shortcoming of this method is installed exactly.
Summary of the invention
Technical matters to be solved by this invention provides and a kind ofly under the detection optical fiber crack conditions, can detect breakpoint location, and simple in structure, is prone to the barrier the sought Brillouin optical time domain analysis appearance of realizing.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of barrier Brillouin optical time domain analysis appearance of seeking; Comprise Brillouin optical time domain analysis module, optical fiber seek the barrier module, splitter module and detection optical fiber; Described splitter module is provided with two light signal input ports and a light signal output end mouth; The first light signal output end mouth of described Brillouin optical time domain analysis module is connected with the first light signal input port of described splitter module; Described optical fiber is sought the barrier module and is connected with the second light signal input port of described splitter module; The light signal output end mouth of described splitter module is connected with the input port of described detection optical fiber, and the second light signal output end mouth of described Brillouin optical time domain analysis module is connected with the output port of described detection optical fiber.
Described splitter module can be 1 * 2 photoswitch that light path is switched usefulness, also can be the compound light wavelength division multiplexing of different wave length.
It can be optical time domain reflectometer OTDR that described optical fiber is sought the barrier module, also can be easy optical fiber barrier finder.
Further; Also be provided with 2 * 2 photoswitches between splitter module and the detection optical fiber; Described 2 * 2 photoswitches are provided with two input ports and two output ports; The second light signal output end mouth of the light signal output end mouth of described splitter module and described Brillouin optical time domain analysis module is connected with two input ports of described 2 * 2 photoswitches respectively, and the input port of described detection optical fiber and output port are respectively at being connected with two output ports of described 2 * 2 photoswitches.Mode of operation through described 2 * 2 photoswitches is switched, and can realize the monitoring of two-way fibre loss distribution measuring and fracture defect, and effectively improves the loss/fault measuring precision of long-distance optical fiber.
Beneficial effect of the present invention: (1) provides a kind of structure more simply can seek the Brillouin optical time domain analysis appearance of barrier; (2) through selecting wavelength-division multiplex type splitter module for use, monitoring when can realize fiber optic temperature, strain and fibre loss/fault, and because wavelength division multiplexer is a passive device, long-term reliability is higher; (3) through increasing by 2 * 2 photoswitches, can also realize two-way fibre loss/fault measuring, and effectively improve the loss/fault measuring precision of long-distance optical fiber.
Description of drawings
Fig. 1 seeks the structural representation of barrier Brillouin optical time domain analysis appearance for the present invention is a kind of;
Fig. 2 can two-wayly seek the structural representation of barrier Brillouin optical time domain analysis appearance for the present invention is a kind of.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment 1:
As shown in Figure 1, a kind of barrier Brillouin optical time domain analysis appearance of seeking comprises that Brillouin optical time domain analysis module 1, optical fiber seeks barrier module 2, splitter module 3 and detection optical fiber 4.Wherein Brillouin optical time domain analysis module 1 is provided with two light signal output end mouths 11 and 12, and splitter module 3 is provided with two light signal input ports 31 and 32 and light signal output end mouths 33.The first light signal output end mouth 11 of Brillouin optical time domain analysis module is connected with the first light signal input port 31 of splitter module; Optical fiber is sought barrier module 2 and is connected with the second light signal input port 32 of splitter module; The light signal output end mouth 33 of splitter module is connected with the input port of detection optical fiber 4, and the second light signal output end mouth 12 of Brillouin optical time domain analysis module is connected with the output port of detection optical fiber 4.
Optical fiber is sought barrier module 2 can select optical time domain reflectometer OTDR for use, also can select the simple and easy barrier finder of not being with the loss distribution curve for use.Select for use in the present embodiment and use OTDR more widely in the communication.
Optical branching device module 3 can select for use light path to switch 1 * 2 photoswitch of usefulness, also can select the light wavelength division multiplexing that different wave length is compound for use.When optical branching device module 3 is selected 1 * 2 photoswitch for use; Select different light paths through circuit control: when input port 31 is connected with output port 33; Brillouin optical time domain analysis module 1 and detection optical fiber 4 formation loops realize the distributed sensing of optical fiber is measured; When input port 32 was connected with output port 33, optical fiber was sought barrier module 2 and is connected with detection optical fiber 4, realizes loss distribution measuring and malfunction monitoring to optical fiber.When optical branching device module 3 is selected light wavelength division multiplexing for use; Brillouin optical time domain analysis module 1 is different with the operation wavelength that optical fiber is sought barrier module 2; The operation wavelength of Brillouin optical time domain analysis module 1 is preferably 1550nm in the present embodiment; The operation wavelength that optical fiber is sought barrier module 2 is preferably 1310nm, and Brillouin optical time domain analysis module 1 was sought barrier module 2 with optical fiber and can be worked simultaneously this moment, and the distributed sensing of promptly realizing optical fiber is simultaneously measured and the loss/malfunction monitoring of optical fiber.In addition, because light wavelength division multiplexing is a passive device, need not electronic control component, long-term reliability is higher.
Embodiment 2:
As shown in Figure 2, a kind ofly can two-wayly seek barrier Brillouin optical time domain analysis appearance, comprise that Brillouin optical time domain analysis module 1, optical fiber seeks barrier module 2, splitter module 3, detection optical fiber 4 and 2 * 2 photoswitches 5.Different with embodiment 1, between splitter module 3 and detection optical fiber 4, also be provided with 2 * 2 photoswitches 5, wherein 2 * 2 photoswitches 5 are provided with two light signal input ports 51 and 52 and two light signal output end mouths 53 and 54.The first light signal output end mouth 11 of Brillouin optical time domain analysis module is connected with the first light signal input port 31 of splitter module; Optical fiber is sought barrier module 2 and is connected with the second light signal input port 32 of splitter module; The light signal output end mouth 33 of splitter module is connected with 52 with the input port 51 of 2 * 2 photoswitches 5 respectively with the second light signal output end mouth 12 of deep pool, lining light time domain analyzing module, and the output port 53 of 2 * 2 photoswitches 5 is connected with output port with the input port of detection optical fiber 4 respectively with 54.
2 * 2 photoswitches 5 are a kind of light path control devices, and present embodiment is selected 2 * 2 micromechanical optical switch for use, can realize two kinds of light paths selections through circuit control, are respectively parallel light path 51 → 53,52 → 54 and intersect light path 51 → 54,52 → 53.When 2 * 2 photoswitches 5 were selected parallel light path, optical fiber was sought the forward malfunction monitoring that barrier module 2 can realize detection optical fiber 4; Otherwise when 2 * 2 photoswitches 5 selected to intersect light path, optical fiber was sought the reverse fault monitoring that barrier module 2 can realize detection optical fiber 4.Measure because the Brillouin optical time domain analysis appearance is used for reaching 100 kilometers optical fiber distributed type more, if the fiber failure point at 80 kilometers places, relatively poor because of distance measuring accuracy too far away during forward fault measuring pattern, bearing accuracy is not good, influences line upkeep; Can realize positive and negative bidirectional optical fiber malfunction monitoring after increasing by 2 * 2 photoswitches 5, the trouble spot equivalence is 20 kilometers during at this moment for the reverse fault measurement pattern, and can obtain sufficiently high measuring accuracy this moment, helps fiber failure and disposes.
The above is merely preferred embodiment of the present invention, should not be construed as the restriction to protection domain of the present invention.All within spirit of the present invention and principle, any type of distortion of being done, be equal to replacement, improvement etc. and all should be included within protection scope of the present invention.
Claims (3)
1. can seek barrier Brillouin optical time domain analysis appearance for one kind; Comprise Brillouin optical time domain analysis module and detection optical fiber; It is characterized in that also comprising that optical fiber seeks barrier module and splitter module; Described splitter module is provided with two light signal input ports and a light signal output end mouth; The first light signal output end mouth of described Brillouin optical time domain analysis module is connected with the first light signal input port of described splitter module; Described optical fiber is sought the barrier module and is connected with the second light signal input port of described splitter module, and the light signal output end mouth of described splitter module is connected with the input port of described detection optical fiber, and the second light signal output end mouth of described Brillouin optical time domain analysis module is connected with the output port of described detection optical fiber.
2. a kind of barrier Brillouin optical time domain analysis appearance of seeking as claimed in claim 1; It is characterized in that also being provided with between splitter module and the detection optical fiber 2 * 2 photoswitches; Described 2 * 2 photoswitches are provided with two input ports and two output ports; The second light signal output end mouth of the light signal output end mouth of described splitter module and described Brillouin optical time domain analysis module is connected with two input ports of described 2 * 2 photoswitches respectively, and the input port of described detection optical fiber and output port are respectively at being connected with two output ports of described 2 * 2 photoswitches.
3. according to claim 1 or claim 2 a kind of seeks barrier Brillouin optical time domain analysis appearance, it is characterized in that described splitter module is wavelength division multiplexer or 1 * 2 photoswitch.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323040A (en) * | 2013-05-17 | 2013-09-25 | 国家电网公司 | Multi-parameter distributed optical fiber sensing device |
| CN107588926A (en) * | 2017-10-30 | 2018-01-16 | 中光华研电子科技有限公司 | A kind of fault monitoring system and method for overlength optical cable |
| CN108020399A (en) * | 2016-10-31 | 2018-05-11 | 中国石油天然气集团公司 | A kind of difunctional optical path structure |
| CN112880713A (en) * | 2021-01-18 | 2021-06-01 | 广东电网有限责任公司 | Light path protection device of Brillouin optical time domain analyzer |
| CN113175988A (en) * | 2021-04-13 | 2021-07-27 | 太原理工大学 | Anti-noise and breakpoint self-diagnosis distributed optical fiber sound sensing device |
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2012
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103323040A (en) * | 2013-05-17 | 2013-09-25 | 国家电网公司 | Multi-parameter distributed optical fiber sensing device |
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| CN107588926A (en) * | 2017-10-30 | 2018-01-16 | 中光华研电子科技有限公司 | A kind of fault monitoring system and method for overlength optical cable |
| CN112880713A (en) * | 2021-01-18 | 2021-06-01 | 广东电网有限责任公司 | Light path protection device of Brillouin optical time domain analyzer |
| CN112880713B (en) * | 2021-01-18 | 2023-10-20 | 广东电网有限责任公司 | Optical path protection device of Brillouin optical time domain analyzer |
| CN113175988A (en) * | 2021-04-13 | 2021-07-27 | 太原理工大学 | Anti-noise and breakpoint self-diagnosis distributed optical fiber sound sensing device |
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Owner name: ZHEJIANG ZHONGXIN POWER MEASURING + CONTROLING TEC Free format text: FORMER OWNER: NINGBO NUOTCH PHOTOELECTRIC TECHNOLOGY DEVELOPMENT CO., LTD. Effective date: 20140603 |
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Denomination of invention: A traceable Brillouin optical time-domain analyzer Effective date of registration: 20231225 Granted publication date: 20150708 Pledgee: Haishu Sub branch of Bank of Ningbo Co.,Ltd. Pledgor: ZHEJIANG ZHONGXIN POWER MEASUREMENT AND CONTROL TECHNOLOGY Co.,Ltd. Registration number: Y2023980072971 |