CN102735272B - Barrier-searchable Brillouin optical time domain analyzer - Google Patents
Barrier-searchable Brillouin optical time domain analyzer Download PDFInfo
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- CN102735272B CN102735272B CN201210189637.0A CN201210189637A CN102735272B CN 102735272 B CN102735272 B CN 102735272B CN 201210189637 A CN201210189637 A CN 201210189637A CN 102735272 B CN102735272 B CN 102735272B
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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 one and can seek barrier Brillouin optical time domain analysis instrument.
Background technology
The New Sensing Technology that Fibre Optical Sensor grows up as the seventies, compared with conventional sensors, has many good qualities: electromagnetism interference, electrical isolation, and corrosion-resistant, highly sensitive, lightweight, volume is little, shape variable, and cost is low.And at sensory field of optic fibre, distributed Fibre Optical Sensor takes full advantage of the feature of optical fiber one-dimensional space continuous distribution, optical fiber can be measured exactly and go up the measured field of any point (temperature, stress, vibration) information distribution over time and space along the line, can accomplish as the nervous system of people, to carry out perception, remote monitoring and monitoring to each position of infrastructure engineering facility.
Brillouin optical time domain analysis instrument (BOTDA) development in recent years based on optical fiber Brillouin scattering enlarge-effect principle is rapid, this kind of sensor realizes the measurement of distributed sensor to various parameter by detection fiber each position stimulated Brillouin scattering light relative to the frequency shift amount of incident light, its advantage is that the dynamic range measured is large, and precision is high.But the light signal received due to detector in Brillouin optical time domain analysis instrument is sent by the light source of the other end, after detection optical fiber ruptures, the light that light source sends cannot arrive detector, therefore, Brillouin optical time domain analysis instrument not only cannot detection fiber breakpoint, and cannot normally work.Brillouin optical time-domain reflectometer (BOTDR) is although possess the function of optical fiber being carried out to 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 Brillouin optical time domain analysis instrument.Application number is 201010229974.9 patent discloses and a kind ofly add the device that barrier function sought by optical fiber in loop shape Fibre Optical Sensor, adopt multiple photoswitch to control Fibre Optical Sensor and to seek the duty hindering module, but the maximum shortcoming of the method is exactly that device is comparatively complicated.
Summary of the invention
Technical matters to be solved by this invention is to provide one can detect breakpoint location under detection optical fiber crack conditions, and structure is simple, the barrier the sought Brillouin optical time domain analysis instrument easily realized.
The present invention solves the problems of the technologies described above adopted technical scheme: one can seek barrier Brillouin optical time domain analysis instrument, comprise Brillouin optical time domain analysis module, barrier module sought by optical fiber, splitter module and detection optical fiber, described splitter module is provided with two optical signal input mouths and a light signal output end mouth, first light signal output end mouth of described Brillouin optical time domain analysis module is connected with the first optical signal input mouth of described splitter module, described optical fiber is sought barrier module and is connected with the second optical signal input mouth 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, 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 switches, and also can be the light wavelength division multiplexing of different wave length compound.
Barrier module sought by described optical fiber can be optical time domain reflectometer OTDR, also can be easy optical fiber barrier finder.
Further, 2 × 2 photoswitches are also provided with between splitter module and detection optical fiber, 2 × 2 described photoswitches are provided with two input ports and two output ports, the light signal output end mouth of described splitter module is connected with two input ports of 2 × 2 described photoswitches respectively with the second light signal output end mouth of described Brillouin optical time domain analysis module, and the input port of described detection optical fiber is connected respectively at two output ports of 2 × 2 described photoswitches with output port.Switched by the mode of operation of 2 × 2 described photoswitches, two-way fibre loss distribution measuring and fracture defect monitoring can be realized, and effectively improve 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 instrument of barrier; (2) by selecting wavelength-division multiplex type splitter module, while fiber optic temperature, strain and fibre loss/fault can be realized monitor, and due to wavelength division multiplexer be passive device, long-term reliability is higher; (3) by increase by 2 × 2 photoswitch, two-way fibre loss/fault measuring can also be realized, and effectively improve the loss/fault measuring precision of long-distance optical fiber.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation seeking barrier Brillouin optical time domain analysis instrument of the present invention;
Fig. 2 is a kind of structural representation two-wayly can seeking barrier Brillouin optical time domain analysis instrument of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, one can seek barrier Brillouin optical time domain analysis instrument, comprises 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 optical signal input mouths 31 and 32 and a light signal output end mouth 33.First light signal output end mouth 11 of Brillouin optical time domain analysis module is connected with the first optical signal input mouth 31 of splitter module, optical fiber is sought barrier module 2 and is connected with the second optical signal input mouth 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.
Barrier module 2 sought by optical fiber can select optical time domain reflectometer OTDR, also can select the simple and easy barrier finder not with loss distribution curve.Select in the present embodiment in communication and apply OTDR more widely.
1 × 2 photoswitch that light branching unit module 3 can select light path to switch, also can select the light wavelength division multiplexing of different wave length compound.When light branching unit module 3 selects 1 × 2 photoswitch, different light paths is selected: when input port 31 is connected with output port 33 by control circui, Brillouin optical time domain analysis module 1 and detection optical fiber 4 form loop, realize measuring the distributed sensing of optical fiber; When input port 32 is connected with output port 33, optical fiber is sought barrier module 2 and is connected with detection optical fiber 4, realizes the loss distribution measuring to optical fiber and malfunction monitoring.When light branching unit module 3 selects light wavelength division multiplexing, it is different that the operation wavelength hindering module 2 sought by Brillouin optical time domain analysis module 1 and optical fiber, in the present embodiment, the operation wavelength of Brillouin optical time domain analysis module 1 is preferably 1550nm, the operation wavelength that barrier module 2 sought by optical fiber is preferably 1310nm, now Brillouin optical time domain analysis module 1 and optical fiber are sought and hinders module 2 and can work simultaneously, namely realize the distributed sensing measurement of optical fiber and the loss/malfunction monitoring of optical fiber simultaneously.In addition, because light wavelength division multiplexing is passive device, without the need to electronic control component, long-term reliability is higher.
Embodiment 2:
As shown in Figure 2, one two-wayly can seek barrier Brillouin optical time domain analysis instrument, comprises Brillouin optical time domain analysis module 1, optical fiber seeks barrier module 2, splitter module 3, detection optical fiber 4 and 2 × 2 photoswitch 5.Different from embodiment 1, between splitter module 3 and detection optical fiber 4, be also provided with 2 × 2 photoswitches 5, wherein 2 × 2 photoswitches 5 are provided with two optical signal input mouths 51 and 52 and two light signal output end mouths 53 and 54.First light signal output end mouth 11 of Brillouin optical time domain analysis module is connected with the first optical signal input mouth 31 of splitter module, optical fiber is sought barrier module 2 and is connected with the second optical signal input mouth 32 of splitter module, the light signal output end mouth 33 of splitter module is connected with the input port 51 and 52 of 2 × 2 photoswitches 5 respectively with the second light signal output end mouth 12 of inner deep optical time-domain analysis module, and the output port 53 of 2 × 2 photoswitches 5 is connected with the input port of detection optical fiber 4 and output port respectively with 54.
2 × 2 photoswitches 5 are a kind of optical path control device, and the present embodiment selects 2 × 2 micromechanical optical switch, can realize two kinds of light paths and select, be respectively parallel light path 51 → 53,52 → 54 and cross path 51 → 54,52 → 53 by control circui.When 2 × 2 photoswitches 5 select parallel light path, the forward malfunction monitoring that barrier module 2 can realize detection optical fiber 4 sought by optical fiber; Otherwise when 2 × 2 photoswitches 5 select cross path, the reverse fault monitoring that barrier module 2 can realize detection optical fiber 4 sought by optical fiber.Because Brillouin optical time domain analysis instrument is used for the distributed fiber optic sensing reaching 100 kilometers, if fiber failure is o'clock at 80 kms, because of poor apart from measuring accuracy too far away during forward fault measuring pattern, positioning precision is not good, affects line upkeep; Positive and negative bidirectional optical fiber malfunction monitoring can be realized after increasing by 2 × 2 photoswitches 5, now 20 kilometers are equivalent to for trouble spot during reverse fault measurement pattern, now can obtain sufficiently high measuring accuracy, be conducive to fiber failure and dispose.
The foregoing is only preferred embodiment of the present invention, should not be construed as limiting the scope of the invention.Within the spirit and principles in the present invention all, any type of distortion done, equivalent replacement, improvement etc. all should be included within protection scope of the present invention.
Claims (2)
1. can seek barrier Brillouin optical time domain analysis instrument for one kind, comprise Brillouin optical time domain analysis module, detection optical fiber, optical fiber seeks barrier module and splitter module, described splitter module is provided with two optical signal input mouths and a light signal output end mouth, first light signal output end mouth of described Brillouin optical time domain analysis module is connected with the first optical signal input mouth of described splitter module, described optical fiber is sought barrier module and is connected with the second optical signal input mouth 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, 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, it is characterized in that also being provided with 2 × 2 photoswitches between described splitter module and described detection optical fiber, 2 × 2 described photoswitches are provided with two input ports and two output ports, the light signal output end mouth of described splitter module is connected with two input ports of 2 × 2 described photoswitches respectively with the second light signal output end mouth of described Brillouin optical time domain analysis module, the input port of described detection optical fiber is connected respectively at two output ports of 2 × 2 described photoswitches with output port.
2. one as claimed in claim 1 can seek barrier Brillouin optical time domain analysis instrument, it is characterized in that described splitter module is wavelength division multiplexer or 1 × 2 photoswitch.
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| CN103323040B (en) * | 2013-05-17 | 2016-03-02 | 国家电网公司 | A kind of many reference amounts distribution type optical fiber sensing equipment |
| 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 |
| 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 |
| 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 |
| CN113175988B (en) * | 2021-04-13 | 2022-04-19 | 太原理工大学 | A Distributed Optical Fiber Sound Sensing Device with Anti-noise and Breakpoint Self-diagnosis |
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| CN1556384A (en) * | 2004-01-09 | 2004-12-22 | �Ϻ���ͨ��ѧ | Precise Location Method of Optical Cable Line Fault Point |
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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 |
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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 |