CN101893456B - Loop type optical fiber sensor - Google Patents
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- CN101893456B CN101893456B CN2010102299749A CN201010229974A CN101893456B CN 101893456 B CN101893456 B CN 101893456B CN 2010102299749 A CN2010102299749 A CN 2010102299749A CN 201010229974 A CN201010229974 A CN 201010229974A CN 101893456 B CN101893456 B CN 101893456B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 124
- 230000003287 optical effect Effects 0.000 claims abstract description 141
- 238000001514 detection method Methods 0.000 claims description 54
- 230000004888 barrier function Effects 0.000 claims description 28
- 239000000835 fiber Substances 0.000 description 17
- 238000005259 measurement Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The invention discloses a loop type optical fiber sensor. The loop type optical fiber sensor comprises a signal processing module, an optical fiber detecting module, an optical fiber obstacle seeking module and three optical switch modules, wherein a first optical switch module and a third optical switch module are provided with two optical signal input ports and an optical signal output port respectively; a second optical switch module is provided with an optical signal input port and two optical signal output ports; the two output ports of the signal processing module are connected with one optical signal input port of the first optical switch module and one optical signal input port of the third optical switch module respectively; the optical fiber obstacle seeking module is connected with the optical signal input port of the second optical switch module; the two optical signal output ports of the second optical switch module are connected with the idle optical signal input ports on the first optical switch module and the third optical switch module respectively; and the optical signal output ports of the first optical switch module and the third optical switch module are connected with the input end and the output end of the optical fiber detecting module respectively. The loop type optical fiber sensor can detect the positions of breakpoints under the conditions of detecting optical fiber cuts.
Description
Technical field
The present invention relates to a kind of Fibre Optical Sensor, especially relate to a kind of loop type optical fiber sensor.
Background technology
At sensory field of optic fibre; It is very extensive to adopt the Fibre Optical Sensor of detection optical fiber loop measurement to use in fields such as temperature, stress, vibrations, as based on the optical fiber Brillouin light time domain analyzer of optical fiber Brillouin scattering enlarge-effect principle, based on the distributed optical fiber vibration sensor of Mach one damp moral (M-Z) interferometer principle etc.The maximum characteristics that loop type optical fiber sensor is measured are that the light source output port is different with receiving port; That is to say at the optical fiber other end and receive the signal that light source sends; Therefore; The signal processing module of loop type optical fiber sensor has two ports at least, can optical fiber head and afterbody be inserted respectively in two ports, and detection optical fiber forms loop.Two-port single loop type optical fibre sensor structure is shown in figure (1), and 4 port dual loop optical fibre sensor structures are shown in figure (2).
Detector and light source are at same end in the single-ended measurement type Fibre Optical Sensor, and the signal that detector received is a rear orientation light, have weakness such as signal is small and weak, signal to noise ratio (S/N ratio) is low, like Raman scattering type Fibre Optical Sensor, Brillouin light time-domain reflectomer etc.Different with the mode of single-ended measurement type, loop type optical fiber sensor has adopted the mode of direct measured light intensity, and the mode of this direct detection is improved signal to noise ratio (S/N ratio), the raising measuring accuracy of system greatly.But; Because being the light source by the other end, sends the light signal that detector received in the loop type optical fiber sensor; After sensor fibre ruptures, the light that light source sends can't arrive detector, therefore; Loop type optical fiber sensor not only can't the detection fiber breakpoint, and can't operate as normal.
Summary of the invention
Technical matters to be solved by this invention provides a kind of under the detection optical fiber crack conditions, can detect the loop type optical fiber sensor of breakpoint location.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of loop type optical fiber sensor; Comprise signal processing module and detection optical fiber module; Comprise that also optical fiber seeks barrier module, first optical switch module, second optical switch module and the 3rd optical switch module; Described first optical switch module and described the 3rd optical switch module are respectively equipped with two light signal input ports and a light signal output end mouth; Described second optical switch module is provided with a light signal input port and two light signal output end mouths; First output port of described signal processing module is connected with a light signal input port of described first optical switch module; Second output port of described signal processing module is connected with a light signal input port of described the 3rd optical switch module; Described optical fiber is sought the barrier module and is connected with the light signal input port of described second optical switch module; Two light signal output end mouths of described second optical switch module are connected with vacant light signal input port on described the 3rd optical switch module with described first optical switch module respectively, and the light signal output end mouth of described first optical switch module is connected with the input end of described detection optical fiber module, and the light signal output end mouth of described the 3rd optical switch module is connected with the output terminal of described detection optical fiber module.
Described detection optical fiber module comprises the 4th optical switch module, the 5th optical switch module, first detection optical fiber and second detection optical fiber; Described the 4th optical switch module and described the 5th optical switch module are respectively arranged with a light signal input port and two light signal output end mouths; The light signal input port of described the 4th optical switch module is connected with the light signal output end mouth of described first optical switch module; Two light signal output end mouths of described the 4th optical switch module are connected with the input end of described first detection optical fiber and described second detection optical fiber respectively; The output terminal of described first detection optical fiber and described second detection optical fiber is connected with two light signal output end mouths of described the 5th optical switch module respectively, and the light signal input port of described the 5th optical switch module is connected with the light signal output end mouth of described the 3rd optical switch module.
Said detection optical fiber module also can be an optical fiber.
Described signal processing module is Brillouin light time domain analyzer or distributed optical fiber vibration sensor.
It can be the common optical fiber barrier finder or the optical time domain reflectometer (OTDR) of specialty that described optical fiber is sought the barrier module.
Compared with prior art, the invention has the advantages that having merged optical fiber seeks the barrier function, when detection optical fiber ruptured, loop type optical fiber sensor not only can detect the fault of optical fiber, and particular location that can the detection fiber breakpoint.Through increased by three optical switch modules at the signal processing module output terminal; Optical fiber is sought in the barrier module incoming fiber optic sensor; Make the loop type optical fiber sensor after the improvement possess the sensor fibre fault detection capability; Accurate failure judgement point position when sensor fibre ruptures, the perfect measurement contents of loop type optical fiber sensor has been expanded application; Switching through three optical switch modules; Can optical fiber be sought barrier module light detecting signal and inject the different piece sensor fibre respectively; After fault detects respectively and finishes the fault detect result is merged into whole piece detection optical fiber fault detect result, effectively guaranteed the precision when remote fiber failure detects; Through using optical switch module; Loop type optical fiber sensor module and optical fiber seek the barrier module relatively independent, system is when switching to difference in functionality, another function can not exert an influence to it; Reduce light source switch number of times in two modules, prolonged the serviceable life of Fibre Optical Sensor.
When realizing loop type Fibre Optical Sensor function, utilize two optical switch modules that the formation loop is connected in two outputs of signal processing module with detection optical fiber; The input and the detection optical fiber that utilize the another one photoswitch that optical fiber is sought the barrier module break off, and system only realizes the function of Fibre Optical Sensor;
When using optical fiber to seek the barrier module; Utilize two optical switch modules that signal processing module output and detection optical fiber are broken off; Utilize the another one optical switch module at first optical fiber to be sought the output of barrier module from end input detection optical fiber; After one end fault detect finishes, utilize photoswitch that optical fiber is sought the barrier module and be outputted to, treat after other end fault detect finishes twice fault detect result to be merged into whole piece detection optical fiber fault detect result from other end input detection optical fiber.
Description of drawings
Fig. 1 is two-port single loop type optical fibre sensor structure figure in the prior art;
Fig. 2 is four port dual loop optical fibre sensor structure figure in the prior art;
Fig. 3 has the loop type optical fiber sensor structural drawing that optical fiber is sought the barrier function for the present invention;
Fig. 4 can measure the loop type optical fiber sensor structural drawing that optical fiber is sought the barrier function that has of multifiber simultaneously for the present invention.
Embodiment
Below be example with two-port single loop type Fibre Optical Sensor, embodiment describes in further detail the present invention in conjunction with accompanying drawing.
Embodiment one: as shown in Figure 3; A kind of loop type optical fiber sensor; Comprise that signal processing module 4, optical fiber seeks barrier module 5, first optical switch module 1, second optical switch module 2, the 3rd optical switch module 3 and a detection optical fiber 6; Signal processing module 4 is Brillouin light time domain analyzers; Optical fiber is sought barrier module 5 and is adopted optical time domain reflectometer; First optical switch module 1 is provided with 11,12 and light signal output end mouths 13 of two light signal input ports; The 3rd optical switch module 3 is provided with 31,32 and light signal output end mouth 33, the second optical switch modules 2 of two light signal input ports and is provided with a light signal input port 21 and two light signal output end mouths 22,23, and first output port 41 of signal processing module 4 is connected with a light signal input port 11 of first optical switch module 1; Second output port 42 of signal processing module 4 is connected with a light signal input port 32 of the 3rd optical switch module 3; Optical fiber is sought barrier module 5 and is connected with the light signal input port 21 of second optical switch module 2, and light signal output end mouth 22 of second optical switch module 2 is connected with the vacant light signal input port 12 on first optical switch module 1, and another light signal output end mouth 23 of second optical switch module 2 is connected with vacant light signal input port 31 on the 3rd optical switch module 3; The light signal output end mouth 13 of first optical switch module 1 is connected with the input end of detection optical fiber 6, and the light signal output end mouth 33 of the 3rd optical switch module 3 is connected with the output terminal of detection optical fiber 6.
In the present embodiment, when using the loop type optical fiber sensor function, first optical switch module 1 is set to input port 11 to output port 13 paths, and input port 12 is forbidden to output port 13; The 3rd optical switch module 3 is set to input port 32 to output port 33 paths, and input port 31 is forbidden to output port 33.At this moment, 42 of signal processing module first output port 41 and second output ports are realized the loop type optical fiber sensor function through first optical switch module 1, the 3rd optical switch module 3 and detection optical fiber 6 formation loops.
When using optical fiber to seek barrier module 5, first optical switch module 1 is set to input port 11 to be forbidden to output port 13, and input port 12 is to output port 13 paths; The 3rd optical switch module 3 is set to input port 32 to be forbidden to output port 33, and input port 31 is to output port 33 paths.As second optical switch module 2 being set to input port 21 to output port 22 paths, input port 21 is forbidden to output port 23; At this moment, optical fiber is sought the detection light signal of barrier module 5 outputs from 2 inputs of second optical switch module, detects detection optical fiber 6 through first optical switch module, 1 input detection optical fiber 6.As second optical switch module 2 being set to input port 21 to output port 23 paths, input port 21 is forbidden to output port 22; At this moment, optical fiber is sought the detection light signal of barrier module 5 outputs from 2 inputs of second optical switch module, detects detection optical fiber 6 through the 3rd optical switch module 3 input detection optical fibers 6.After obtaining above-mentioned two parts fault detect result, just can utilize known software algorithm to merge into the fault detect result of whole piece detection optical fiber 6.
Embodiment two: as shown in Figure 4; A kind of loop type optical fiber sensor; Comprise that signal processing module 4, optical fiber seeks barrier module 5, first optical switch module 1, second optical switch module 2, the 3rd optical switch module 3, the 4th optical switch module 7, the 5th optical switch module 8, first detection optical fiber 61 and second detection optical fiber 62; Signal processing module 4 is distributed optical fiber vibration sensors; Optical fiber is sought barrier module 5 and is adopted the general optical fiber barrier finder; First optical switch module 1 is provided with 11,12 and light signal output end mouths 13 of two light signal input ports; The 3rd optical switch module 3 is provided with 31,32 and light signal output end mouths 33 of two light signal input ports; Second optical switch module 2 is provided with a light signal input port 21 and two light signal output end mouths 22,23; The 4th optical switch module 7 is provided with a light signal input port 71 and two light signal output end mouths 72,73; The 5th optical switch module 8 is provided with a light signal input port 81 and two light signal output end mouths 82,83; First output port 41 of signal processing module 4 is connected with a light signal input port 11 of first optical switch module 1, and second output port 42 of signal processing module 4 is connected with a light signal input port 32 of the 3rd optical switch module 3, and optical fiber is sought barrier module 5 and is connected with the light signal input port 21 of second optical switch module 2; Light signal output end mouth 22 of second optical switch module 2 is connected with the vacant light signal input port 12 on first optical switch module 1; Another light signal output end mouth 23 of second optical switch module 2 is connected with vacant light signal input port 31 on the 3rd optical switch module 3, and the light signal output end mouth 13 of first optical switch module 1 is connected with the light signal input port 71 of the 4th optical switch module 7, and the light signal output end mouth 33 of the 3rd optical switch module 3 is connected with the light signal input port 81 of the 5th optical switch module 8; A light signal output end mouth 72 of the 4th optical switch module 7 is connected with the input end of first detection optical fiber 61; Another light signal output end mouth 73 of the 4th optical switch module 7 is connected with the input end of second detection optical fiber 62, and the output terminal of first detection optical fiber 61 is connected with a light signal output end mouth 82 of the 5th optical switch module 8, and the output terminal of second detection optical fiber 62 is connected with another light signal output end mouth 83 of the 5th optical switch module 8.
In the foregoing description, each optical switch module all adopts 1*2 type electric control optical switch, through the changeable light signal output end mouth of level of change control pin and the annexation of light signal input port.
Claims (5)
1. loop type optical fiber sensor; Comprise signal processing module and detection optical fiber module; It is characterized in that also comprising that optical fiber seeks barrier module, first optical switch module, second optical switch module and the 3rd optical switch module; Described first optical switch module and described the 3rd optical switch module are respectively equipped with two light signal input ports and a light signal output end mouth; Described second optical switch module is provided with a light signal input port and two light signal output end mouths; First output port of described signal processing module is connected with a light signal input port of described first optical switch module; Second output port of described signal processing module is connected with a light signal input port of described the 3rd optical switch module; Described optical fiber is sought the barrier module and is connected with the light signal input port of described second optical switch module; Two light signal output end mouths of described second optical switch module are connected with vacant light signal input port on described the 3rd optical switch module with described first optical switch module respectively, and the light signal output end mouth of described first optical switch module is connected with the input end of described detection optical fiber module, and the light signal output end mouth of described the 3rd optical switch module is connected with the output terminal of described detection optical fiber module.
2. a kind of loop type optical fiber sensor as claimed in claim 1; It is characterized in that described detection optical fiber module comprises the 4th optical switch module, the 5th optical switch module, first detection optical fiber and second detection optical fiber; Described the 4th optical switch module and described the 5th optical switch module are respectively arranged with a light signal input port and two light signal output end mouths; The light signal input port of described the 4th optical switch module is connected with the light signal output end mouth of described first optical switch module; Two light signal output end mouths of described the 4th optical switch module are connected with the input end of described first detection optical fiber and described second detection optical fiber respectively; The output terminal of described first detection optical fiber and described second detection optical fiber is connected with two light signal output end mouths of described the 5th optical switch module respectively, and the light signal input port of described the 5th optical switch module is connected with the light signal output end mouth of described the 3rd optical switch module.
3. a kind of loop type optical fiber sensor as claimed in claim 1 is characterized in that said detection optical fiber module is an optical fiber.
4. like claim 1 or 2 or 3 described a kind of loop type optical fiber sensors, it is characterized in that described signal processing module is Brillouin light time domain analyzer or distributed optical fiber vibration sensor.
5. like claim 1 or 2 or 3 described a kind of loop type optical fiber sensors, it is characterized in that it can be the common optical fiber barrier finder or the optical time domain reflectometer of specialty that described optical fiber is sought the barrier module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102221421B (en) * | 2011-03-29 | 2014-01-08 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber sensor for temperature and strain measurement and measuring method |
| CN102425995B (en) * | 2011-11-22 | 2013-12-18 | 无锡成电光纤传感科技有限公司 | Optical fiber sensor system for measuring static/dynamic strain and temperatures simultaneously and method for optical fiber sensor system |
| CN102721484B (en) * | 2012-06-08 | 2014-07-23 | 浙江中欣动力测控技术有限公司 | Distributed optical fiber sensing device based on brillouin scattering |
| CN102706477B (en) * | 2012-06-08 | 2014-04-23 | 宁波诺驰光电科技发展有限公司 | Distributed optical fiber sensing device and method for simultaneously measuring temperature and strain |
| CN102735272B (en) * | 2012-06-08 | 2015-07-08 | 浙江中欣动力测控技术有限公司 | Barrier-searchable Brillouin optical time domain analyzer |
| 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 |
| CN103344314B (en) * | 2013-06-15 | 2018-10-26 | 威海北洋光电信息技术股份公司 | M-Z optical fiber vibration sensing systems and its broken fiber detecting method |
| CN109240368A (en) * | 2018-08-30 | 2019-01-18 | 浙江中欣动力测控技术有限公司 | A kind of fever cable heating control apparatus |
| AU2020368425A1 (en) * | 2019-10-17 | 2022-05-26 | Hawk Measurement Systems Pty. Ltd. | A mounting structure for a vibration sensing system |
| CN112611410B (en) * | 2020-12-08 | 2022-08-05 | 苏州光格科技股份有限公司 | BOTDA system and automatic fiber breaking positioning method thereof |
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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: 20140529 |
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Denomination of invention: A Loop type Fiber Optic Sensor Effective date of registration: 20231225 Granted publication date: 20120118 Pledgee: Haishu Sub branch of Bank of Ningbo Co.,Ltd. Pledgor: ZHEJIANG ZHONGXIN POWER MEASUREMENT AND CONTROL TECHNOLOGY Co.,Ltd. Registration number: Y2023980072971 |