CN109541715B - Railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing - Google Patents
Railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 69
- 230000009545 invasion Effects 0.000 title claims abstract description 56
- 230000003287 optical effect Effects 0.000 claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims description 72
- 230000010287 polarization Effects 0.000 claims description 25
- 239000000835 fiber Substances 0.000 claims description 21
- 230000006870 function Effects 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 abstract description 24
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The invention discloses a railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing, which is based on two distributed optical fiber sensing technologies and a video linkage technology: monitoring vibration intrusion signals generated when illegal personnel, vehicles and construction intrudes into a high-speed railway by using a phase optical time domain analysis technology, and giving information such as positions and events of the intrusion signals; when large-scale falling rocks and debris flows invade a high-speed railway, a brillouin optical time domain analysis technology is utilized to monitor a high-speed railway fence deformation signal generated, and information such as the position of the invasion signal is given; when any one of the two optical fiber sensing systems or the two optical fiber sensing systems generate an alarm, the two optical fiber sensing systems can be linked with cameras arranged on the high-speed railway tower pole to call a monitoring picture of an intrusion event. The three subsystems work synchronously, learn each other, monitor intrusion layer by layer, and jointly realize early warning and recognition of high-speed railway foreign matter intrusion.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing.
Background
The optical fiber is used as a sensor with light as a medium, is resistant to electromagnetic interference and can adapt to severe natural environment; the loss is low, and the sensor is suitable for long-distance sensing; the optical fiber is a signal transmission channel and a sensor. Optical fibers have been widely studied for their unique advantages of small size, light weight, electromagnetic interference resistance, sensitivity to vibration, temperature and strain, etc. The distributed optical fiber sensing system uses the optical fiber as a sensing medium, and can perform real-time remote monitoring on targets in the length of the optical fiber. The high-speed railway foreign matter invasion safety sensing and identifying device based on distributed optical fiber sensing can sense and automatically identify objects illegally entering a high-speed railway line. Two advanced distributed optical fiber sensing technologies exist, Φ -OTDR (Phase-sensitive optical time domain reflectometer, phase-sensitive Optical Time-Domain Reflectometer) and BOTDA (brillouin optical time domain analysis technology, brillouin Time Domain Analysis). The phase sensitive optical time domain reflection technology is mainly used for monitoring vibration signals generated by foreign matter invasion along the high-speed railway. The Brillouin optical time domain analysis technology is mainly used for monitoring fence deformation signals generated by large foreign matter invasion along the high-speed railway.
The high-speed railways in China have wide distribution areas, long distances, complex geological conditions and serious natural disasters, and the expressways have the characteristics of day and night operation, closed type, train running permission and the like. Due to the characteristics of long distance, wide distribution area, day and night operation, closed type and the like, when natural disasters such as landslide, geological settlement and the like occur along the high-speed railway, road traffic failure warning cannot be issued in time, and serious traffic safety accidents and chain reactions are easy to cause. In order to reduce traffic accidents of high-speed railways and reduce casualties and property loss, the early warning of natural disasters and special traffic safety accident warning along the high-speed railways are urgently needed to be solved.
At present, a high-speed railway foreign matter intrusion monitoring system mainly adopts measures such as a rigid protective net and the like, and does not have a system for sensing and identifying foreign matter intrusion. The invention creatively provides a high-speed railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing. Simultaneously, the optical fiber sensing technology and the video linkage technology are used to combine the respective sensing advantages to ensure the operation safety of the surrounding environment along the line of the high-speed railway. The foreign matter invasion safety sensing and identifying device has the advantages of modularized detection function, multi-defense area protection, target traceability, identifiable physical property and day-and-night continuous availability, can identify, distinguish, track and early warn illegal personnel, vehicles, construction and moving objects at the periphery outside a line, and is capable of sensing and early warning against riot and aiming at the conditions of invasion of large-scale falling rocks, debris flows and the like into and out of the line of an operation line, so that the safety of lives and national properties of passengers is effectively ensured.
Disclosure of Invention
The invention aims to provide a railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing, which can realize early warning and identification of high-speed railway foreign matter invasion.
The technical aim of the invention is realized by the following technical scheme:
railway foreign matter invasion safety perception and recognition system based on distributed optical fiber sensing, including monitoring module, detection module and communication module, monitoring module is a plurality of, detection module includes vibration detection system and deformation detection system, communication module includes network switching device, data center and control terminal, detection module passes through network switching device connects data center, data center signal connection control terminal:
the vibration detection system comprises a vibration sensing optical cable and a vibration detection host, wherein the vibration sensing optical cable is arranged outside a railway fence and is used for sensing vibration invasion and generating invasion signals, and the vibration detection host is connected with the vibration sensing optical cable through optical cable signals and is used for receiving the invasion signals, analyzing and identifying the invasion signals, giving alarm positions, identifying alarm events and giving alarm display of an electronic map;
the deformation detection system comprises a deformation sensing optical cable and a deformation detection host, wherein the deformation sensing optical cable is arranged on a railway fence and is used for sensing deformation of the fence and generating an invasion signal, and the deformation detection host is connected with the deformation sensing optical cable through an optical cable signal and is used for receiving the invasion signal and analyzing the magnitude and invasion position of stress caused to the fence;
the monitoring module comprises a camera device, a storage device and an optical fiber transceiver, and is used for receiving the intrusion signal of the detection module, and the camera device transmits a video signal to the storage device through a data transmission optical cable and displays the video signal on the control terminal.
The vibration detection host comprises a laser A11, a modulator 12, a function generator A13, a erbium-doped fiber amplifier A14, a circulator 15, a detector A17, a collection card A18 and a calculator A19, wherein continuous light generated by the laser A11 is modulated into pulse light through the modulator 12 controlled by the function generator A13, the pulse light is amplified through the erbium-doped fiber amplifier A14, the amplified pulse light is injected into a sensing optical cable through the circulator 15, the reflected Rayleigh scattering light is subjected to photoelectric conversion through the detector A17, and then data are collected through the collection card A18 controlled by the function generator A13, and final data are transmitted into the calculator A19.
The railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing is characterized in that the laser A11 is a semiconductor external cavity laser or a fiber bragg grating laser.
The above-mentioned safety sensing and identifying system for railway foreign matter invasion based on distributed optical fiber sensing, the modulator 12 is an acousto-optic modulator or an electro-optic modulator.
The above-mentioned railway foreign matter invasion safety perception and recognition system based on distributed optical fiber sensing, the deformation detection host machine includes a laser B21, a coupler 22, a polarization controller, an electro-optical modulator, a function generator B25, a disturbance bias controller 26, an erbium-doped optical fiber amplifier B27, a microwave generator 210, an optical isolator 211, a circulator, an optical fiber grating filter 215, a detector B216, a collection card B217 and a calculator B218, wherein the laser B21 in the deformation detection host machine is divided into two paths by the coupler 22, one path of light is used for generating pumping light, the other path of light is used for generating detection light, the pumping light and the detection light generate stimulated brillouin scattering phenomenon in a sensing optical cable, the generated stokes light is filtered out by the optical fiber grating filter 215, enters the detector B216 through the circulator to be converted into an electric signal, and the signal is collected by the collection card B217 and transmitted to the calculator B218.
According to the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the pump light is subjected to polarization state adjustment through the polarization controller A23, then is subjected to control of the electro-optical modulator A24 through the function generator B25, is subjected to modulation Cheng Maichong light, is subjected to disturbance of the polarization state through the disturbance polarization controller 26, enters the erbium-doped optical fiber amplifier B27, and is injected into a sensing optical cable through the circulator A213.
The above-mentioned railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing, the detected light goes through the polarization controller B28 to regulate polarization state, and enters the electro-optical modulator B29, the electro-optical modulator B29 loads the microwave signal generated by the microwave generator 210 on the detected light, and enters the sensing optical cable through the optical isolator 211, the back scattering signal generated in the sensing optical cable is filtered out by the optical fiber grating filter 215, and then goes through the circulator B214, and enters the detector B216 to perform photoelectric conversion, then goes through the acquisition card B217 to perform data acquisition, and finally transmits the data into the calculator B218
In the railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing, the laser B21 is a distributed feedback semiconductor laser DFB or a tunable optical fiber laser.
In the above-mentioned safety sensing and identifying system for railway foreign matter intrusion based on distributed optical fiber sensing, the coupling ratio of the coupler 22 is between 90:10 and 50:50.
In summary, the invention has the following beneficial effects: the railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing is based on two distributed optical fiber sensing technologies and a video linkage technology, wherein the distributed optical fiber sensing technologies are a phase optical time domain reflection technology and a Brillouin optical time domain analysis technology. When illegal personnel, vehicles and construction invasion high-speed railways are monitored by utilizing a phase optical time domain analysis technology, the generated vibration invasion signals are provided, and information such as positions and events of the invasion signals is given, so that the system is a first-layer monitoring system for invasion of foreign matters of the high-speed railways. When large-scale falling rocks and debris flows invade a high-speed railway, the brillouin optical time domain analysis technology is utilized to monitor the deformation signals of the fence of the high-speed railway, and information such as the positions of the invasion signals is given out, so that the system is a second-layer monitoring system for invasion of foreign matters of the high-speed railway. When any one of the two optical fiber sensing systems or the two optical fiber sensing systems generate an alarm, the two optical fiber sensing systems can be linked with a camera arranged on a high-speed railway tower pole to call a monitoring picture of an intrusion event, and the monitoring picture is a third-layer monitoring system for intrusion of foreign matters of the high-speed railway. The three-layer foreign matter intrusion monitoring system jointly ensures the safe operation of the high-speed railway.
Drawings
FIG. 1 is a schematic diagram of a vibration detection host in a railway foreign matter intrusion safety sensing and recognition system based on distributed optical fiber sensing;
fig. 2 is a schematic structural diagram of a deformation detecting host in the railway foreign matter intrusion safety sensing and recognition system based on distributed optical fiber sensing.
Detailed Description
The present invention will be described in further detail below.
Referring to fig. 1 and 2, the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing comprises a plurality of monitoring modules, a plurality of detection modules and a plurality of communication modules, wherein each detection module comprises a vibration detection system and a deformation detection system, each communication module comprises a network switching device, a data center and a control terminal, each detection module is connected with the corresponding data center through the corresponding network switching device, and each data center is in signal connection with the corresponding control terminal:
the vibration detection system comprises a vibration sensing optical cable and a vibration detection host, wherein the vibration sensing optical cable is arranged outside a railway fence and is used for sensing vibration invasion and generating invasion signals, the vibration detection host is connected with the vibration sensing optical cable through optical cable signals and is used for receiving the invasion signals and analyzing and identifying the invasion signals, giving alarm positions, identifying alarm events and giving an electronic map for alarm display, and when a foreign object invades the high-speed railway system, the vibration sensing optical cable can timely sense the vibration generated by invasion and transmits the vibration signals to the detection host 1 through the optical cable for signal analysis and identification;
one of the vibration detection optical cables in the vibration detection system is buried and arranged at a position 2 meters outside a high-speed railway fence, a loop of 1 meter is arranged between the other optical cable and the first optical cable in a buried mode, and one end of the vibration detection optical cable is connected to an optical interface of a vibration detection host;
the deformation detection system comprises a deformation sensing optical cable and a deformation detection host, wherein the deformation sensing optical cable is arranged on a railway fence and is used for sensing deformation of the fence and generating an invasion signal, and the deformation detection host is connected with the deformation sensing optical cable through an optical cable signal and is used for receiving the invasion signal and analyzing the magnitude and invasion position of stress caused to the fence;
the monitoring module comprises a camera device, a storage device and an optical fiber transceiver, and is used for receiving the intrusion signal of the detection module, and the camera device transmits a video signal to the storage device through a data transmission optical cable and displays the video signal on the control terminal. A camera device is placed on a tower pole at intervals along the high-speed railway, a switch is used between every two camera devices, video signals are transmitted to a storage device through a data transmission optical cable, and the video signals are displayed on a display control terminal.
Preferably, the vibration detection optical cable in the vibration detection system adopts an S-shaped buried arrangement mode.
Preferably, the deformation detection optical cable in the deformation detection system adopts a double-core optical cable for layout and adopts an S-shaped layout mode.
Preferably, the camera device in the monitoring module is a spherical laser camera, and an infrared camera or a thermal imaging camera is adopted.
Further, in the preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the vibration detection host comprises a laser A11, a modulator 12, a function generator A13, a erbium-doped optical fiber amplifier A14, a circulator 15, a detector A17, a collection card A18 and a calculator A19, continuous light generated by the laser A11 is modulated into pulse light through the modulator 12 controlled by the function generator A13, the pulse light is amplified through the erbium-doped optical fiber amplifier A14, the amplified pulse light is injected into a sensing optical cable through the circulator 15, the reflected Rayleigh scattering light is subjected to photoelectric conversion through the detector A17, and then data are collected through the collection card A18 controlled by the function generator A13, and finally the data are transmitted into the calculator A19.
Further, in a preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the laser a11 is a semiconductor external cavity laser or a fiber grating laser.
Further, in the preferred embodiment of the railway foreign matter intrusion security sensing and recognition system based on distributed optical fiber sensing of the present invention, the modulator 12 is an acousto-optic modulator or an electro-optic modulator.
Further, in the preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the deformation detection host includes a laser B21, a coupler 22, a polarization controller, an electro-optical modulator, a function generator B25, a disturbance bias controller 26, an erbium-doped optical fiber amplifier B27, a microwave generator 210, an optical isolator 211, a circulator, an optical fiber grating filter 215, a detector B216, a collection card B217 and a calculator B218, wherein the laser B21 in the deformation detection host is divided into two paths by the coupler 22, one path of light is used for generating pumping light, the other path of light is used for generating detection light, the pumping light and the detection light generate stimulated brillouin scattering phenomenon in a sensing optical cable, the generated stokes light is filtered out by the optical fiber grating filter 215, enters the detector B216 through the circulator to be converted into an electric signal, and the signal is collected by the collection card B217 and transmitted to the calculator B218.
Preferably, a single sideband modulator is used to generate side frequency light as the probe light.
Preferably, a tunable filter is used to filter out stokes light.
Further, in the preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the pump light is subjected to polarization state adjustment through the polarization controller A23, then is subjected to control of the electro-optical modulator A24 through the function generator B25, is subjected to modulation Cheng Maichong, is subjected to polarization state disturbance through the polarization disturbance controller 26, enters the erbium-doped optical fiber amplifier B27, and is injected into a sensing optical cable through the circulator A213.
Further, in the preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the detection light enters the electro-optical modulator B29 after being subjected to polarization state adjustment by the polarization controller B28, the electro-optical modulator B29 loads the microwave signal generated by the microwave generator 210 on the detection light, enters the sensing optical cable by the optical isolator 211, the backscattering signal generated in the sensing optical cable is filtered out by the optical fiber grating filter 215, passes through the circulator B214, enters the detector B216 for photoelectric conversion, and then is subjected to data acquisition by the acquisition card B217, and finally is transmitted into the calculator B218.
The laser B21 outputs continuous laser with frequency, and is divided into two paths of light through the coupler 22 to respectively provide pump light and probe light, and the splitting ratio of the coupler is 50:50. the upper continuous light firstly passes through the polarization controller A23 to modulate the polarization state and enters the electro-optical modulator A24. Under the control of the function generator B25, the pulse waveform output by the electro-optical modulator A24 is amplified by the erbium-doped fiber amplifier B27 after being disturbed by the disturbance polarization controller 26, and enters the sensing optical cable through the circulator A213.
The lower branch provides detection light, the polarization state of the detection light is regulated by the polarization controller B28, the detection light enters the electro-optical modulator B29, and the electro-optical modulator B29 is used for loading a microwave signal generated by the microwave generator 210 onto the detection light, so that upper and lower side frequency light with the frequency difference of Brillouin frequency shift is generated on the basis of original carrier light, and the frequencies of the upper and lower side frequency light are respectively the original laser frequency. After passing through the optical isolator 211, it enters the sensing fiber optic cable.
The pumping light and the detection light generate stimulated Brillouin scattering phenomenon in the sensing optical cable, the generated Stokes light enters the circulator B214 through the circulator A213, the lower side frequency is filtered out by the fiber grating filter 215, then the pumping light and the detection light enter the detector B216 to be converted into electric signals through the circulator B214, and the electric signals are collected through the collection card B217 and transmitted to the calculator B218 for processing.
Further, in a preferred embodiment of the railway foreign matter intrusion safety sensing and identifying system based on distributed optical fiber sensing, the laser B21 is a distributed feedback semiconductor laser DFB or a tunable optical fiber laser.
Further, in a preferred embodiment of the present invention based on distributed fiber optic sensing for security sensing and identification of foreign object intrusion, the coupling ratio of the coupler 22 is between 90:10 and 50:50.
In summary, the railway foreign matter invasion safety sensing and identifying system based on the distributed optical fiber sensing is based on two distributed optical fiber sensing technologies and a video linkage technology, wherein the distributed optical fiber sensing technologies are a phase optical time domain reflection technology and a Brillouin optical time domain analysis technology. When illegal personnel, vehicles and construction invasion high-speed railways are monitored by utilizing a phase optical time domain analysis technology, the generated vibration invasion signals are provided, and information such as positions and events of the invasion signals is given, so that the system is a first-layer monitoring system for invasion of foreign matters of the high-speed railways. When large-scale falling rocks and debris flows invade a high-speed railway, the brillouin optical time domain analysis technology is utilized to monitor the deformation signals of the fence of the high-speed railway, and information such as the positions of the invasion signals is given out, so that the system is a second-layer monitoring system for invasion of foreign matters of the high-speed railway. When any one of the two optical fiber sensing systems or the two optical fiber sensing systems generate an alarm, the two optical fiber sensing systems can be linked with a camera arranged on a high-speed railway tower pole to call a monitoring picture of an intrusion event, and the monitoring picture is a third-layer monitoring system for intrusion of foreign matters of the high-speed railway. The three-layer foreign matter intrusion monitoring system jointly ensures the safe operation of the high-speed railway.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The present embodiment is merely illustrative of the present invention and is not intended to be limiting, and modifications thereof without creative contribution can be made by those skilled in the art after reading the present specification, as long as they are protected by patent laws within the scope of claims of the present invention.
Claims (7)
1. Railway foreign matter invasion safety perception and recognition system based on distributed optical fiber sensing, including monitoring module, detection module and communication module, its characterized in that: the monitoring modules are a plurality of, the detection modules comprise a vibration detection system and a deformation detection system, the communication modules comprise a network switching device, a data center and a control terminal, the detection modules are connected with the data center through the network switching device, and the data center is in signal connection with the control terminal:
the vibration detection system comprises a vibration sensing optical cable and a vibration detection host, wherein the vibration sensing optical cable is arranged outside a railway fence and is used for sensing vibration invasion and generating invasion signals, and the vibration detection host is connected with the vibration sensing optical cable through optical cable signals and is used for receiving the invasion signals, analyzing and identifying the invasion signals, giving alarm positions, identifying alarm events and giving alarm display of an electronic map;
the deformation detection system comprises a deformation sensing optical cable and a deformation detection host, wherein the deformation sensing optical cable is arranged on a railway fence and is used for sensing deformation of the fence and generating an invasion signal, and the deformation detection host is connected with the deformation sensing optical cable through an optical cable signal and is used for receiving the invasion signal and analyzing the magnitude and invasion position of stress caused to the fence;
the monitoring module comprises a camera device, a storage device and an optical fiber transceiver, and is used for receiving the intrusion signal of the detection module, and the camera device transmits a video signal to the storage device through a data transmission optical cable and displays the video signal on the control terminal;
the vibration detection host comprises a laser A (11), a modulator (12), a function generator A (13), a erbium-doped optical fiber amplifier A (14), a circulator (15), a detector A (17), an acquisition card A (18) and a calculator A (19), continuous light generated by the laser A (11) is modulated Cheng Maichong light through the modulator (12) under the control of the function generator A (13), pulse light is amplified through the erbium-doped optical fiber amplifier A (14), the amplified pulse light is injected into a sensing optical cable through the circulator (15), reflected Rayleigh scattered light is subjected to photoelectric conversion through the detector A (17), data acquisition is performed through the acquisition card A (18) controlled by the function generator A (13), and final data are transmitted into the calculator A (19);
the deformation detection host comprises a laser B (21), a coupler (22), a polarization controller, an electro-optical modulator, a function generator B (25), a deflection disturbing controller (26), an erbium-doped fiber amplifier B (27), a microwave generator (210), an optical isolator (211), a circulator, a fiber grating filter (215), a detector B (216), a collection card B (217) and a calculator B (218), wherein the laser B (21) in the deformation detection host is divided into two paths through the coupler (22), one path of light is used for generating pumping light, the other path of light is used for generating detection light, the pumping light and the detection light generate stimulated Brillouin scattering phenomenon in a sensing optical cable, the generated Stokes light is filtered out by the fiber grating filter (215), enters the detector B (216) through the circulator to be converted into an electric signal, and the signal is collected by the collection card B (217) and transmitted to the calculator B (218).
2. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the laser A (11) is a semiconductor external cavity laser or a fiber grating laser.
3. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the modulator (12) is an acousto-optic modulator or an electro-optic modulator.
4. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the pump light passes through the polarization controller A (23) to adjust the polarization state, then passes through the function generator B (25) to control the electro-optical modulator A (24) to modulate Cheng Maichong light, the pulse light passes through the disturbance polarization controller (26) to disturb the polarization state, then enters the erbium-doped fiber amplifier B (27), and then the amplified pulse light is injected into the sensing optical cable through the circulator A (213).
5. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the detection light enters an electro-optical modulator B (29) through a polarization controller B (28), a microwave signal generated by a microwave generator (210) is loaded on the detection light by the electro-optical modulator B (29), a sensing optical cable is entered through an optical isolator (211), a back scattering signal generated in the sensing optical cable is filtered out of a lower side frequency through a fiber grating filter (215), then enters a detector B (216) through a circulator B (214) to perform photoelectric conversion, then data are acquired through an acquisition card B (217), and final data are transmitted into a calculator B (218).
6. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the laser B (21) is a distributed feedback semiconductor laser DFB or a tunable fiber laser.
7. The distributed fiber optic sensing based security sensing and identification system for railway foreign object intrusion as claimed in claim 1, wherein: the coupling ratio of the coupler (22) is between 90:10 and 50:50.
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| CN110304053B (en) * | 2019-04-09 | 2020-04-03 | 陈辉 | Automatic data correction mechanism |
| CN110989026A (en) * | 2019-11-16 | 2020-04-10 | 南京派光智慧感知信息技术有限公司 | Safety monitoring method for cross-railway bridge |
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| CN113435250B (en) * | 2021-05-25 | 2024-02-27 | 西北工业大学深圳研究院 | Full-time road detection method and device based on focal plane division infrared polarization imaging |
| CN115840223B (en) * | 2023-02-15 | 2023-05-09 | 成都熵泱科技有限公司 | Unmanned aerial vehicle detection system and method capable of identifying target attribute |
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