CN104627205A - Railway foreign matter beyond limit monitoring system based on fiber bragg grating sensor closed loop - Google Patents
Railway foreign matter beyond limit monitoring system based on fiber bragg grating sensor closed loop Download PDFInfo
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- CN104627205A CN104627205A CN201410787447.8A CN201410787447A CN104627205A CN 104627205 A CN104627205 A CN 104627205A CN 201410787447 A CN201410787447 A CN 201410787447A CN 104627205 A CN104627205 A CN 104627205A
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Abstract
The invention discloses a design method for railway protective net foreign matter monitoring based on fiber bragg gratings. The design method relates to a light source, an optical switch, an annular device, a fiber bragg grating sensor, a photoelectric detector (PD) and a terminal demodulating system. The fiber bragg grating sensor is arranged on a railway protective net fixing support and is prevented from being damaged. The PD receives optical signals reflected/transmitted by the fiber bragg gratings, and transmits the optical signals to the terminal demodulating system to obtain changes of sensor central wavelengths through demodulating. An optical fiber link is tightly attached to a protective net and is fixed to the protective net. The design method can be used for railway protective net foreign matter beyond limit real-time monitoring and alarming.
Description
Technical field
What the present invention relates to is sensory field of optic fibre, is design based on Bragg optical-fiber grating sensor and optical fiber grating regulating system.The sensitivity of Bragg optical-fiber grating sensor to vibration is very high, and optical fiber quality is light, and low price, is very suitable for the monitoring to railway protective net.
Background technology
Railway protective net monitoring foreign bodies mainly refers to by arranging grille guard along the railway, and corresponding sensor is installed on grille guard, to realize the Real-Time Monitoring of invading railway mountain stone or other foreign matters and effective early warning, to reduce the Loss of Life and property that foreign body intrusion causes railway transportation.
China railways department arranges rigid protection net at the road and rail section of walking abreast, highway (bridge) across places such as railway divisions and installs electrical network formula foreign matter intrusion sensor online, once there be foreign body intrusion event to occur, break grille guard, the mode responded to by electrical network can to control center's alarm.But this traditional electrical network sensing technology existence is subject to electromagnetic interference and thunderbolt, electric signal long-distance transmissions poor reliability, later stage use and maintenance cost is high, transmission cable ruptures or power failure can produce the technical barriers such as wrong report.
Based on the railway protective net foreign body monitoring system of optical fiber grating sensing, its sensor adopts fiber Bragg grating sensor.Compared with traditional electrical sensor, fiber-optic grating sensor has electromagnetism interference, anti-lightning strike, optical signal transmission distance, can realize quasi-distributed measurement, high reliability.
Summary of the invention
In view of the above deficiency of prior art, the railway protective net foreign body monitoring system that the object of this invention is to provide based on Bragg grating sensor makes it to have the following advantages: the first, accurately can locate the position that grille guard is destroyed; The second, after destroyed in grille guard somewhere, system still can normally be monitored.
The concrete means realizing the object of the invention are:
Based on the railway foreign body intrusion monitoring system of fiber-optic grating sensor closed loop, pass through optical path, hardware demodulation device and upper computer judge whether grille guard is subject to foreign body intrusion, optical path comprises: wideband light source 101 output optical signal is through F-P cavity tunable optic filter 102, namely the optical fiber transducer that optic coupler device connects based on Bragg grating sensor closes measure link, finally by photodetector by measurement signal input optical fibre grating demodulation instrument 601, restituted signal is inputted upper computer 701 after demodulating the change of each raster center wavelength by fiber Bragg grating (FBG) demodulator, display and the analysis of demodulation signal is realized at upper computer, pass through data processing, judge whether there is foreign body intrusion event, output alarm signal 801.
Its concrete light path system can be adopted in two ways:
The concrete light path of scheme one is configured to: optical signal is divided into two-way by optic coupler 201 by output optical signal after F-P cavity tunable optic filter 102, lead up to the first circulator 401, make the reflected light signal in optical fiber turn back to the first circulator 401, optical signal transmissive arrives the second circulator 402; Another road reflected signal returns the second circulator 402, and transmission signal arrives parasite 401; When foreign invades the generation of limit event, whole optical fiber link 900 two-way admittance; First detector 501 and the second detector 502 are respectively by the measurement signal input optical fibre grating demodulation instrument 601 of the first circulator 401 and the second circulator 402.
The concrete light path of scheme two is configured to: whole fiber-optic grating sensor link is formed closed circuit by circulator 403, photoswitch 701 again by output optical signal after F-P cavity tunable optic filter 102.
Adopt design as above, usefulness of the present invention is presented as:
1, be set up at the cloth of sensor, the order (or reverse order) that the centre wavelength of all Bragg optical-fiber grating sensors grows to long wavelength according to shortwave is arranged on grille guard fixed leg.The benefit of this method of designing is that system accurately can determine the position of sensor near fracture position, thus carries out quick position to grille guard breaking part if grille guard has a place foreign body intrusion event occurs and ruptures.
2, Bragg grating sensor is well protected on grille guard, and thus after grille guard somewhere is destroyed, only optical fiber can rupture, and grating sensor is not easily damaged.Now all grating sensors normally work, and system provides current foreign body intrusion alerting signal and accurate location thereof, can also carry out Real-Time Monitoring to the foreign body intrusion event of other positions simultaneously.Even if the fiber-optic grating sensor of this position is destroyed, the grating sensor of other positions still can normally work, and carries out Real-Time Monitoring to the foreign body intrusion event of other positions.
Accompanying drawing illustrates:
The spectrum schematic diagram that the principle design figure that Fig. 1 (a) is scheme one, Fig. 1 (b) measure for it.
Fig. 2 is the principle design figure of scheme two and the spectrum schematic diagram of measurement.
Fig. 3 is sensor scheme of installation.
Fig. 4 is fiber-optic grating sensor scheme of installation on grille guard.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
In Fig. 1 (a), optical signal, through F-P cavity tunable optic filter 102, is divided into two-way by optic coupler 201 by wideband light source 101 output optical signal.Lead up to the first circulator 401, the reflected light signal in optical fiber turns back to the first circulator 401, and optical signal transmissive arrives the second circulator 402; Another road reflected signal returns the second circulator 402, and transmission signal arrives the first circulator 401.When foreign invades the generation of limit event, whole optical fiber link 900 two-way admittance.
Now, PD1 (501) and PD2 (502) detects the superposition value of the light intensity of reflected signal and transmission signal, i.e. the spectrogram of light source, as shown in Fig. 1 (b).Fiber-optic grating sensor (901,901', 902,902', 903 ...) be fixed on grille guard support, this position is corresponding with the centre wavelength of grating sensor.
Optical signal transmission can use armored optical cable or is placed in special protective conduit by optical fiber.Optical fiber is laid along grille guard mesh, and when foreign body intrusion event occurs in grille guard somewhere, this grille guard is destroyed, and the sensor fibre 900 be fixed on this position grille guard ruptures.
The measurement signal input optical fibre grating demodulation instrument 601 of detector 501 and 502 demodulates the change of each raster center wavelength.Restituted signal input upper computer 602, by data processing, judges whether there is foreign body intrusion event, output alarm signal 603.
Grating sensor it can be fixed on railway protective on the net by the order of bragg wavelength ascending (or descending), also can fix in any order.System locates the position of breaking part according to the change of Received signal strength spectrogram after fibercuts.
If there is foreign body intrusion event, PD1 and PD2 can only detect the heliogram that respective amount fiber-optic grating sensor reflects respectively.Suppose that foreign body intrusion event occurs, the grille guard between the 4th, 5 fiber-optic grating sensor occurs damaged, and the optical fiber that this position is installed will rupture.Suppose to have 8 fiber-optic grating sensors, then two detectors receive only 4 fiber-optic grating sensor return signals respectively, and upper computer 602 provides the accurate location of alerting signal and foreign body intrusion by data analysis.Received signal strength spectrum is as shown in Fig. 1 (b).
Now, if be also destroyed at another place's grille guard, system also can detect its position, and provides alerting signal.
Fig. 2 is the structural representation of scheme two.Wideband light source 101 output optical signal through F-P cavity tunable optic filter 102, then passes through circulator 403.The program utilizes photoswitch 701 that whole fiber-optic grating sensor link is formed a closed circuit, the corresponding measured zone of this loop.Photoswitch alternating strobe is positive and negative, to Measurement channel.Reflected light signal in optical fiber turns back to circulator 403, and by detector 503, optical signal is converted to electric signal.Fiber Bragg grating (FBG) demodulator 601 demodulates the change of each raster center wavelength.Restituted signal input upper computer 602, by data processing, judges whether there is foreign body intrusion event, output alarm signal 603.
701 can select Multichannel photoswitch, and suppose that 701 is 8 road photoswitches, then this system can measure 4 regions.
When foreign invades the generation of limit event, suppose to place 8 sensing grating sensors in whole measuring loop, then two passages detect the spectrum of signal as shown in Figure 3 respectively, and the reflectance spectrum of all gratings can measure.
When foreign body intrusion event occurs, grille guard is destroyed, and the optical fiber be fixed on grille guard ruptures thereupon, and fiber-optic grating sensor closed circuit disconnects.Now, passage one and passage two can only detect the reflected signal of respective numbers sensor.As shown in Figure 3, suppose that the grille guard between the 3rd, 4 grating is destroyed, the optical fiber connected between these two grating sensors ruptures, then forward Measurement channel only receives 3 grating back light signals, and oppositely Measurement channel can receive other 5.It is online that centre wavelength due to sensor is arranged in railway protective in a certain order, therefore can determine the position of fibercuts fast according to the change of Received signal strength spectrum.
Figure 4 shows that fiber-optic grating sensor scheme of installation on grille guard, in figure, 301 what represent is the fixed support of grille guard, and for pasting packaged sensor, 302 represent grille guards, 303 represent bragg fiber sensor, and 304 represent grille guard bottom fixing structure.Connect with optical fiber 900 between the fiber-optic grating sensor that two supports are installed, optical fiber is fixed on grille guard 302 along the mesh of grille guard.
Claims (5)
1. based on the railway foreign body intrusion monitoring system of fiber-optic grating sensor closed loop, pass through optical path, hardware demodulation device and upper computer judge whether grille guard is subject to foreign body intrusion, optical path comprises: wideband light source (101) output optical signal is through F-P cavity tunable optic filter (102), namely the optical fiber transducer that optic coupler device connects based on Bragg grating sensor closes measure link, finally by photodetector by measurement signal input optical fibre grating demodulation instrument (601), after fiber Bragg grating (FBG) demodulator demodulates the change of each raster center wavelength, restituted signal is inputted upper computer (701), display and the analysis of demodulation signal is realized at upper computer, pass through data processing, judge whether there is foreign body intrusion event, output alarm signal (801).
2. the railway foreign body intrusion monitoring system based on fiber-optic grating sensor closed loop according to claim 1, it is characterized in that, concrete light path is configured to: optical signal is divided into two-way by optic coupler (201) by output optical signal after F-P cavity tunable optic filter (102), lead up to the first circulator (401), make the reflected light signal in optical fiber turn back to the first circulator (401), optical signal transmissive arrives the second circulator (402); Another road reflected signal returns the second circulator (402), and transmission signal arrives the first circulator (401); When foreign invades the generation of limit event, whole optical fiber link (900) two-way admittance; First detector (501) and the second detector (502) are respectively by measurement signal input optical fibre grating demodulation instrument (601) of the first circulator (401) and the second circulator (402).
3. the railway foreign body intrusion monitoring system based on fiber-optic grating sensor closed loop according to claim 1, it is characterized in that, concrete light path is configured to: whole fiber-optic grating sensor link is formed closed circuit by circulator (403), photoswitch (701) again by output optical signal after F-P cavity tunable optic filter (102).
4. the railway foreign body intrusion monitoring system based on fiber-optic grating sensor closed loop according to claim 3, it is characterized in that, described photoswitch is Multichannel photoswitch, and Multichannel photoswitch connects corresponding Duo Tiao road closed circuit.
5. the railway foreign body intrusion monitoring system based on fiber-optic grating sensor closed loop according to claim 1, it is characterized in that, it is online that fiber-optic grating sensor is fixed on railway protective by the order that bragg wavelength is ascending or descending; Also can fix in any order; System locates the position of breaking part according to the spectrogram of Received signal strength after fibercuts.
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| CN105043458A (en) * | 2015-09-17 | 2015-11-11 | 山东大学 | Device and method for on-line detection of lightning damage of fiber composite material |
| CN105158265A (en) * | 2015-09-17 | 2015-12-16 | 山东大学 | Online detecting device and method for impact damage of composites |
| CN109059794A (en) * | 2018-09-03 | 2018-12-21 | 刘绍波 | A kind of FBG monitoring device of soft protecting net foreign body intrusion |
| CN109195856A (en) * | 2016-03-31 | 2019-01-11 | 西门子移动有限公司 | Identify the method and system of the barrier in the hazard space in front of rail vehicle |
| CN109541715A (en) * | 2019-01-10 | 2019-03-29 | 宁波正业自动化科技有限公司 | Railway foreign body invasion safety perception and identifying system based on distributing optical fiber sensing |
| CN112254934A (en) * | 2020-10-20 | 2021-01-22 | 武汉一三光电科技有限公司 | Bidirectional test system and method for fiber grating filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043458A (en) * | 2015-09-17 | 2015-11-11 | 山东大学 | Device and method for on-line detection of lightning damage of fiber composite material |
| CN105158265A (en) * | 2015-09-17 | 2015-12-16 | 山东大学 | Online detecting device and method for impact damage of composites |
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| CN109541715A (en) * | 2019-01-10 | 2019-03-29 | 宁波正业自动化科技有限公司 | Railway foreign body invasion safety perception and identifying system based on distributing optical fiber sensing |
| CN109541715B (en) * | 2019-01-10 | 2024-02-27 | 宁波正业自动化科技有限公司 | Railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing |
| CN112254934A (en) * | 2020-10-20 | 2021-01-22 | 武汉一三光电科技有限公司 | Bidirectional test system and method for fiber grating filter |
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Inventor after: Wang Pengxiang Inventor after: Luo Yuan Inventor after: Zhang Zhiyong Inventor after: Yan Lianshan Inventor after: Yu Jie Inventor after: Shao Liyang Inventor after: Pan Wei Inventor after: Luo Bin Inventor after: Zou Xihua Inventor after: Huang Weiwei Inventor before: Zhang Zhiyong Inventor before: Yan Lianshan Inventor before: Shao Liyang Inventor before: Pan Wei Inventor before: Luo Bin Inventor before: Zou Xihua Inventor before: Huang Weiwei Inventor before: Luo Yuan |
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Effective date of registration: 20151221 Address after: 100844 Fuxing Road, Beijing, Haidian District, No. 10 Applicant after: CHINA RAILWAY CORPORATION Applicant after: Southwest Jiaotong University Address before: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Applicant before: Southwest Jiaotong University |
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Application publication date: 20150520 |