CN210222274U - Railway foreign matter invasion safety sensing and identification system based on distributed optical fiber sensing - Google Patents
Railway foreign matter invasion safety sensing and identification system based on distributed optical fiber sensing Download PDFInfo
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- CN210222274U CN210222274U CN201920042251.4U CN201920042251U CN210222274U CN 210222274 U CN210222274 U CN 210222274U CN 201920042251 U CN201920042251 U CN 201920042251U CN 210222274 U CN210222274 U CN 210222274U
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Abstract
The utility model discloses a railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing is based on two kinds of distributed optical fiber sensing technologies and video linkage technology: monitoring a vibration invasion signal generated when illegal personnel, vehicles and construction invade a high-speed railway by utilizing a phase optical time domain analysis technology, and giving information such as the position, the event and the like of the invasion signal; monitoring a fence deformation signal of the high-speed railway generated when large-scale rockfall and debris flow invade the high-speed railway by utilizing a Brillouin optical time domain analysis technology, and giving information such as the position of the invasion signal; when any one or two of the two optical fiber sensing systems gives an alarm, the optical fiber sensing systems can be linked with cameras arranged on a high-speed railway tower pole to call monitoring pictures of the intrusion event. The three subsystems work synchronously, study mutually, monitor invasion layer by layer, and realize early warning and identification of foreign matter invasion of the high-speed railway together.
Description
Technical Field
The utility model relates to an optics technical field, in particular to railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing.
Background
The optical fiber is used as a sensor taking 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 transmission channel of signals and a sensor. Optical fibers have been extensively 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 utilizes optical fibers as sensing media and can remotely monitor targets in the length of the optical fibers in real time. 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. Two advanced distributed fiber optic sensing technologies exist, Φ -OTDR (Phase-sensitive Optical Time-Domain Reflectometer) and BOTDA (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 a high-speed railway.
The distribution area of the high-speed railway in China is wide, the distance is long, the geological condition is complex, the natural disaster is serious, and meanwhile, the highway has the characteristics of day and night operation, closed type, only allowing trains to run 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 subsidence and the like occur along the high-speed railway, road traffic fault warning cannot be issued in time, and serious traffic safety accidents and chain reactions are easily caused. In order to reduce traffic accidents of high-speed railways and reduce casualties and property loss, natural disaster early warning and special traffic safety accident alarming along the high-speed railways are urgently needed to be solved.
At present, for a foreign matter invasion monitoring system of a high-speed railway, measures such as a rigid protective net are mainly adopted, and a system for sensing and identifying the invasion of foreign matters is not provided. The utility model discloses creatively provides high-speed railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing. Meanwhile, the optical fiber sensing technology and the video linkage technology are applied, so that the respective sensing advantages are combined with each other to ensure the operation safety of the surrounding environment along the line of the high-speed railway. The foreign matter invasion safety perception and identification device has a 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 persons, vehicles, construction and moving objects at the periphery outside a line, is anti-terrorism and anti-riot, can perceive and early warn aiming at the conditions inside and outside the invasion operation line along the line such as large rockfall, debris flow and the like, and effectively ensures the safety of the lives of passengers and national property.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a realize the early warning of high-speed railway foreign matter invasion and the railway foreign matter invasion safety perception and the identification system based on distributed optical fiber sensing of discernment.
The above technical purpose of the present invention can be achieved by the following technical solutions:
railway foreign matter invasion security perception and identification 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 the railway fence and 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 used for receiving the invasion signals, analyzing and identifying the invasion signals, giving an alarm position, identifying an alarm event and giving an electronic map alarm display;
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 the deformation of the fence and generating an intrusion 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 intrusion signal and analyzing the stress magnitude and the intrusion position 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, the camera device transmits a video signal to the storage device through a data transmission optical cable, and the control terminal displays the video signal.
Foretell railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing, the vibration detection host computer includes laser instrument A11, modulator 12, function generator A13, bait-doped optical fiber amplifier A14, circulator 15, detector A17, acquisition card A18 and calculator A19, the continuous light that laser instrument A11 produced passes through modulator 12 under the control of function generator A13 modulates into the pulsed light, again passes through the pulsed light the bait-doped optical fiber amplifier A14 enlargies, passes through the pulsed light after enlarging in the sensing optical cable is injected into to circulator 15, and the scattered light rayleigh that reflects back passes through detector A17 carries out photoelectric conversion, the rethread function generator A13 control the acquisition card A18 carries out data acquisition to transmit final data into in calculator A19.
In the above railway foreign matter intrusion security sensing and identification system based on distributed optical fiber sensing, the laser a11 is a semiconductor external cavity laser or a fiber grating laser.
In the above system for sensing and identifying intrusion of foreign matters into a railway based on distributed optical fiber sensing, the modulator 12 is an acousto-optic modulator or an electro-optic modulator.
The railway foreign matter intrusion safety sensing and identifying system based on the distributed optical fiber sensing comprises a deformation detection host machine, a laser device B21, a coupler 22, a polarization controller, an electro-optical modulator, a function generator B25, a polarization 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, an acquisition card B217 and a calculator B218, wherein the laser device B21 passes through the coupler 22 and is divided into two paths, one path of light is used for generating pump light, the other path of light is used for generating detection light, the pump 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 and then enters the detector B216 through the circulator and is converted into an electric signal, and the signal is acquired through the acquisition card B217, and transmitted to the calculator B218.
Foretell railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing, the pumping light passes through polarization controller A23 carries out the polarization state and adjusts, passes through under the control of function generator B25 electro-optic modulator A24, modulates into the pulse light, and the pulse light passes through after the polarization controller 26 disturbs its polarization state, get into mix bait optical fiber amplifier B27, pass through the pulse light after will enlarging again circulator A213 pours into the sensing optical cable.
Foretell railway foreign matter invasion safety perception and identification system based on distributed optical fiber sensing, the detected light carries out polarization state through polarization controller B28 and adjusts, gets into electro-optic modulator B29, electro-optic modulator B29 loads the microwave signal that microwave generator 210 produced on the detected light, gets into the sensing optical cable through optical isolator 211, the backscattering signal that produces in the sensing optical cable passes through fiber grating filter 215 filters out the lower limit frequency, passes through circulator B214 again, gets into detector B216 carries out photoelectric conversion, the rethread acquisition card B217 carries out data acquisition to incite final data into in calculator B218
In the above system for safely sensing and identifying intrusion of foreign matters into railways 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 railway foreign object intrusion security sensing and identification system based on distributed optical fiber sensing, the coupling ratio of the coupler 22 is between 90:10 and 50: 50.
To sum up, the utility model discloses following beneficial effect has: the railway foreign matter intrusion security sensing and recognition system based on distributed optical fiber sensing is based on two distributed optical fiber sensing technologies and a video linkage technology, and the distributed optical fiber sensing technologies are a phase optical time domain reflection technology and a Brillouin optical time domain analysis technology. The phase optical time domain analysis technology is used for monitoring a vibration invasion signal generated when illegal personnel, vehicles and construction invade the high-speed railway, and giving information such as the position, the event and the like of the invasion signal, wherein the information is a first-layer monitoring system for the invasion of foreign matters in the high-speed railway. And monitoring a fence deformation signal of the high-speed railway generated when large-scale rockfall and debris flow invade the high-speed railway by utilizing a Brillouin optical time domain analysis technology, and giving information such as the position of the invasion signal, which is a second-layer monitoring system for the invasion of foreign matters of the high-speed railway. When any one or two of the two optical fiber sensing systems gives an alarm, the optical fiber sensing systems can be linked with cameras arranged on a high-speed railway tower pole to transfer a monitoring picture of an intrusion event, and the monitoring picture is a third-layer monitoring system for foreign matter intrusion of the high-speed railway. The three-layer foreign matter intrusion monitoring system ensures the safe operation of the high-speed railway together.
Drawings
Fig. 1 is a schematic structural view of a vibration detection host in a railway foreign matter intrusion security sensing and identification system based on distributed optical fiber sensing of the present invention;
fig. 2 is the utility model discloses a structural schematic of deformation detection host computer among railway foreign matter invasion safety perception and the identification 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 security sensing and identification system based on distributed optical fiber sensing comprises a monitoring module, a detection module and a communication module, wherein the monitoring module is a plurality of, the detection module comprises a vibration detection system and a deformation detection system, the communication module comprises a network switching device, a data center and a control terminal, the detection module is connected with the data center through the network switching device, and the data center is connected with the control terminal through signals:
the vibration detection system comprises a vibration sensing optical cable and a vibration detection host, wherein the vibration sensing optical cable is arranged outside the railway fence and 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 used for receiving the invasion signals, analyzing and identifying the invasion signals, giving an alarm position, identifying an alarm event and giving an electronic map alarm display, when foreign matters invade the high-speed railway system, the vibration sensing optical cable can timely sense the vibration generated by the invasion, and transmits the vibration signals to the detection host 1 through the optical cable to analyze and identify the signals;
one vibration detection optical cable in the vibration detection system is arranged at a position 2 meters outside a high-speed railway fence in a buried mode, the other optical cable is arranged in a buried mode in parallel to the first optical cable at intervals of a loop circuit of 1 meter, and then 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 the deformation of the fence and generating an intrusion 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 intrusion signal and analyzing the stress magnitude and the intrusion position 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, the camera device transmits a video signal to the storage device through a data transmission optical cable, and the control terminal displays the video signal. A camera device is arranged on a tower pole at intervals along the high-speed railway, an exchanger is used between every two camera devices, and video signals are transmitted to a storage device through a data transmission optical cable and displayed on a display control terminal.
Preferably, the vibration detection optical cable in the vibration detection system is arranged in an S-shaped buried manner.
Preferably, the deformation detection optical cable in the deformation detection system is arranged by adopting a double-core optical cable, and an S-shaped arrangement mode is adopted.
Preferably, the camera device in the monitoring module is a ball laser camera, and an infrared camera or a thermal imaging camera is adopted.
Further, the utility model discloses in the embodiment of the railway foreign matter invasion safety perception and identification system based on distributed fiber sensing's preferred, the vibration detection host computer includes laser instrument A11, modulator 12, function generator A13, mix bait fiber amplifier A14, circulator 15, detector A17, capture card A18 and calculator A19, the continuous light that laser instrument A11 produced passes through modulator 12 under the control of function generator A13 is modulated into the pulsed light, passes through the pulsed light with mix bait fiber amplifier A14 and amplify, injects the pulse light after the amplification into the sensing optical cable through circulator 15, and the rayleigh scattered light that reflects back passes through detector A17 carries out photoelectric conversion, and the rethread function generator A13 control the capture card A18 carries out data acquisition, and with final data transmission in calculator A19.
Further, the utility model discloses in the embodiment of the railway foreign matter invasion safety perception and identification system's based on distributed optical fiber sensing preferred, laser instrument A11 is semiconductor external cavity laser or fiber grating laser instrument.
Further, in the preferred embodiment of the railway foreign object intrusion security sensing and identification system based on distributed optical fiber sensing, the modulator 12 is an acousto-optic modulator or an electro-optic modulator.
Further, in the preferred embodiment of the railway foreign object intrusion security sensing and identification system based on distributed optical fiber sensing of the present invention, the deformation detection host comprises a laser B21, a coupler 22, a polarization controller, an electro-optical modulator, a function generator B25, a polarization controller 26, an erbium-doped fiber amplifier B27, a microwave generator 210, an optical isolator 211, a circulator, a fiber grating filter 215, a detector B216, an acquisition card B217, and a calculator B218, wherein the laser B21 in the deformation detection host is divided into two paths through the coupler 22, one path of light is used for generating pump light, the other path of light is used for generating detection light, the pump light and the detection light generate stimulated brillouin a sensing optical cable, the generated stokes light is filtered out by the fiber grating filter 215, and then enters the detector B216 through the circulator to be converted into an electrical signal, the signals are collected by the collecting card B217 and transmitted to the calculator B218.
Preferably, a single sideband modulator is used to generate the sideband light as the probe light.
Preferably, the stokes light is filtered out using a tunable filter.
Further, the utility model discloses in the embodiment of the railway foreign matter invasion safety perception and identification system's preferred based on distributed optical fiber sensing, the pumping light passes through polarization controller A23 carries out the polarization state and adjusts, passes through electro-optical modulator A24 under the control of function generator B25 modulates into the pulse light, and the pulse light passes through after disturbance controller 26 disturbs its polarization state, get into mix bait optical fiber amplifier B27, pass through the pulse light after will enlarging again circulator A213 pours into in the optical sensing cable.
Further, the utility model discloses in the embodiment of the railway foreign matter invasion safety perception and identification system's based on distributed fiber sensing preferred, the detected light carries out polarization state through polarization controller B28 and adjusts, gets into electro-optic modulator B29, electro-optic modulator B29 loads the microwave signal loading that microwave generator 210 produced on the detected light, gets into the sensing optical cable through optical isolator 211, the backscattering signal that produces in the sensing optical cable, process the fiber grating wave filter 215 filters out the lower limit frequently, passes through circulator B214 gets into detector B216 carries out photoelectric conversion, the rethread acquisition card B217 carries out data acquisition to transmit final data into in calculator B218.
The laser B21 outputs continuous laser with a frequency of 50, and is divided into two paths of light by the coupler 22 to provide pump light and probe light respectively, and the splitting ratio of the coupler is: 50. the on-path continuous light firstly passes through a polarization controller A23 to modulate the polarization state and enters an electro-optical modulator A24. Under the control of a function generator B25, the pulse waveform output by the electro-optical modulator A24 is disturbed in polarization state by a disturbance controller 26, amplified by an erbium-doped fiber amplifier B27 and enters a sensing optical cable through a circulator A213.
The lower branch circuit provides detection light, the polarization state of the detection light is adjusted by a polarization controller B28 and then enters an electro-optical modulator B29, the electro-optical modulator B29 is used for loading a microwave signal generated by a microwave generator 210 on the detection light and generating upper and lower frequency lights with Brillouin frequency shift on the basis of the original carrier light, and the frequencies of the upper and lower frequency lights are respectively the original laser frequency. After passing through the optical isolator 211, enters the sensing cable.
The pump light and the detection light generate a stimulated Brillouin scattering phenomenon in the sensing optical cable, the generated Stokes light enters the circulator B214 through the circulator A213, the lower edge frequency is filtered out by using the fiber grating filter 215, the lower edge frequency is then filtered out by using the fiber grating filter 215, the filtered lower edge frequency enters the detector B216 through the circulator B214 and is converted into an electric signal, the signal is collected through the collecting card B217, and the electric signal is transmitted and processed on the calculator B218.
Further, in the preferred embodiment of the railway foreign object intrusion security sensing and identification system based on distributed fiber sensing, the laser B21 is a distributed feedback semiconductor laser DFB or tunable fiber laser.
Further, in the preferred embodiment of the railway foreign object intrusion security sensing and identification system based on distributed optical fiber sensing of the present invention, the coupling ratio of the coupler 22 is between 90:10 and 50: 50.
In summary, the railway foreign matter intrusion security sensing and identification system based on distributed optical fiber sensing is based on two distributed optical fiber sensing technologies and a video linkage technology, and the distributed optical fiber sensing technologies are a phase optical time domain reflection technology and a Brillouin optical time domain analysis technology. The phase optical time domain analysis technology is used for monitoring a vibration invasion signal generated when illegal personnel, vehicles and construction invade the high-speed railway, and giving information such as the position, the event and the like of the invasion signal, wherein the information is a first-layer monitoring system for the invasion of foreign matters in the high-speed railway. And monitoring a fence deformation signal of the high-speed railway generated when large-scale rockfall and debris flow invade the high-speed railway by utilizing a Brillouin optical time domain analysis technology, and giving information such as the position of the invasion signal, which is a second-layer monitoring system for the invasion of foreign matters of the high-speed railway. When any one or two of the two optical fiber sensing systems gives an alarm, the optical fiber sensing systems can be linked with cameras arranged on a high-speed railway tower pole to transfer a monitoring picture of an intrusion event, and the monitoring picture is a third-layer monitoring system for foreign matter intrusion of the high-speed railway. The three-layer foreign matter intrusion monitoring system ensures the safe operation of the high-speed railway together.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. Railway foreign matter invasion security perception and identification system based on distributed optical fiber sensing, including monitoring module, detection module and communication module, its characterized in that: the monitoring module is a plurality of, the detection module includes vibration detection system and deformation detection system, communication module includes network switching device, data center and control terminal, the 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 the railway fence and 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 used for receiving the invasion signals, analyzing and identifying the invasion signals, giving an alarm position, identifying an alarm event and giving an electronic map alarm display;
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 the deformation of the fence and generating an intrusion 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 intrusion signal and analyzing the stress magnitude and the intrusion position 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, the camera device transmits a video signal to the storage device through a data transmission optical cable, and the control terminal displays the video signal.
2. The distributed optical fiber sensing-based railway foreign matter intrusion security sensing and identification system of claim 1, wherein: the vibration detection host machine comprises a laser A (11), a modulator (12), a function generator A (13), an 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) passes through the modulator (12) under the control of the function generator A (13) to be modulated into pulse light, the pulse light passes through the erbium-doped optical fiber amplifier A (14) to be amplified, the amplified pulse light passes through the circulator (15) to be injected into a sensing optical cable, reflected Rayleigh scattering light passes through the detector A (17) to be subjected to photoelectric conversion and then the function generator A (13) to be controlled, the acquisition card A (18) to be subjected to data acquisition, and final data is transmitted into the calculator A (19).
3. The distributed optical fiber sensing-based railway foreign matter intrusion security sensing and identification system of claim 2, wherein: the laser A (11) is a semiconductor external cavity laser or a fiber grating laser.
4. The distributed optical fiber sensing-based railway foreign matter intrusion security sensing and identification system of claim 2, wherein: the modulator (12) is an acousto-optic modulator or an electro-optic modulator.
5. The distributed optical fiber sensing-based railway foreign matter intrusion security sensing and identification system of claim 1, wherein: 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), an acquisition card B (217) and a calculator B (218), wherein the laser B (21) passes through the coupler (22) and is divided into two paths, one path of light is used for generating pump light, the other path of light is used for generating probe light, the pump light and the probe light generate a stimulated Brillouin scattering phenomenon in a sensing optical cable, the generated Stokes light is filtered out by the fiber grating filter (215) and then enters the circulator and the detector B (216) is converted into an electric signal, and collecting signals by the collecting card B (217) and transmitting the signals to the calculator B (218).
6. The distributed optical fiber sensing-based railway foreign body intrusion security sensing and identification system of claim 5, wherein: the pump light passes through polarization controller A (23) carries out the polarization state and adjusts, passes through electro-optic modulator A (24) under function generator B (25) control is modulated into the pulse light, and the pulse light passes through after disturbing partial controller (26) and disturbing its polarization state, get into erbium-doped fiber amplifier B (27), the pulse light after will enlargiing again passes through circulator A (213) pours into in the sensing optical cable.
7. The distributed optical fiber sensing-based railway foreign body intrusion security sensing and identification system of claim 5, wherein: the detection light is subjected to polarization state adjustment through a polarization controller B (28) and enters an electro-optic modulator B (29), the electro-optic modulator B (29) loads a microwave signal generated by a microwave generator (210) on the detection light and enters a sensing optical cable through an optical isolator (211), a backscattering signal generated in the sensing optical cable passes through a fiber grating filter (215) to filter out a lower edge frequency, and then enters a detector B (216) to perform photoelectric conversion through a circulator B (214) and then performs data acquisition through an acquisition card B (217), and finally data are transmitted into a calculator B (218).
8. The distributed optical fiber sensing-based railway foreign body intrusion security sensing and identification system of claim 5, wherein: the laser B (21) is a distributed feedback semiconductor laser DFB or a tunable fiber laser.
9. The distributed optical fiber sensing-based railway foreign body intrusion security sensing and identification system of claim 5, wherein: the coupling ratio of the coupler (22) is between 90:10 and 50: 50.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541715A (en) * | 2019-01-10 | 2019-03-29 | 宁波正业自动化科技有限公司 | Railway foreign matter invasion safety sensing and identification system based on distributed optical fiber sensing |
| CN112550378A (en) * | 2020-11-26 | 2021-03-26 | 安徽徽一通讯科技有限公司 | Method, system and storage for mapping positions between track accompanying optical cable and track |
| CN118230475A (en) * | 2024-05-24 | 2024-06-21 | 南京派光智慧感知信息技术有限公司 | Dual-perception perimeter security monitoring method and system |
| CN118999392A (en) * | 2024-10-18 | 2024-11-22 | 南京派光智慧感知信息技术有限公司 | Monitoring and identifying method and system for road cross-railway anti-throwing network |
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2019
- 2019-01-10 CN CN201920042251.4U patent/CN210222274U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541715A (en) * | 2019-01-10 | 2019-03-29 | 宁波正业自动化科技有限公司 | Railway foreign matter invasion safety sensing and identification system based on distributed 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 |
| CN112550378A (en) * | 2020-11-26 | 2021-03-26 | 安徽徽一通讯科技有限公司 | Method, system and storage for mapping positions between track accompanying optical cable and track |
| CN118230475A (en) * | 2024-05-24 | 2024-06-21 | 南京派光智慧感知信息技术有限公司 | Dual-perception perimeter security monitoring method and system |
| CN118999392A (en) * | 2024-10-18 | 2024-11-22 | 南京派光智慧感知信息技术有限公司 | Monitoring and identifying method and system for road cross-railway anti-throwing network |
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