CN108287017A - Freeway guardrail collision accident alarm system based on φ-OTDR distributing optical fiber sensings - Google Patents
Freeway guardrail collision accident alarm system based on φ-OTDR distributing optical fiber sensings Download PDFInfo
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- CN108287017A CN108287017A CN201711491029.4A CN201711491029A CN108287017A CN 108287017 A CN108287017 A CN 108287017A CN 201711491029 A CN201711491029 A CN 201711491029A CN 108287017 A CN108287017 A CN 108287017A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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Abstract
The invention discloses a kind of freeway guardrail collision accident alarm system based on φ OTDR distributing optical fiber sensings, which includes sensing optic cable, is based on φ OTDR distributed optical fiber vibration sensing systems host, interchanger and monitoring client as described in claim 1；The sensing optic cable is laid on freeway guardrail, and is connect based on φ OTDR distributed optical fiber vibration sensing system hosts with described；It is described to be connect with interchanger based on φ OTDR distributed optical fiber vibration sensing system hosts；The interchanger is connect by network with monitoring client and mobile terminal.The present invention can be in low wrong report and under conditions of low drain report, and twenty four hours round-the-clock multiply personnel safety for highway superior and provides safeguard.
Description
Technical field
The invention belongs to sensory field of optic fibre more particularly to a kind of high speed based on φ-OTDR distributing optical fiber sensings are public
Road fence collision accident alarm system and method.
Background technology
Fast-developing with the traffic in China, vehicle is increasing, main artery of the highway as contact city, at me
Play very important effect in the economic development of state.Unimpeded, safety on highway are particularly important.Highway
Guardrail, since waveform steel guard rail has the function of good Impact Resisting Capability and absorbs energy, can be able to be vehicle in Vehicular impact
And driver and conductor play a very good protection.The intact powerful guarantee provided for traffic safety of guardrail, once by vehicle
Accident damage will bring great danger if non-timely processing to highway.Meanwhile in rainy day, greasy weather, late into the night etc.
In the case of sight is unknown, when traffic accident occurs, seem quarter not the timely assessment of the alarm of accident, positioning, field condition
Rong Huan.The vibration that highway barrier is subject to is converted into audio signal using white light interference module in the prior art, using safeguarding people
Member more accurately judges the impact events that highway barrier is subject to.But its realization is complicated, does not report treatment mechanism by mistake, and also
Need to manually it be judged, practicability is little.
Invention content
The mesh of the present invention is to alarm to be by the freeway guardrail collision accident based on φ-OTDR distributing optical fiber sensings
System solves problems faced in background technology.The present invention can to the guardrail within the scope of 30km hit accident carry out and alarm and
Positioning, especially at night, dense fog, rainy day visual isopter it is unknown in the case of, the monitoring of whole day twenty four hours；And shifting can be pushed to
The equipment such as moved end, notify other driver and conductors, and safety guarantee is provided for driver and passenger.
The technical solution adopted by the present invention to solve the technical problems is：
There is provided it is a kind of be based on φ-OTDR distributed optical fiber vibration sensing system hosts, including laser, acousto-optic modulator,
Impulse type erbium-doped fiber amplifier, filter, circulator, wavelength division multiplexer, raman amplifier, erbium-doped fiber amplifier, photoelectricity
Diode, Data Acquisition Card, data processing module and waveform generator；
The output end of laser and acousto-optic modulator input terminal connect, and the output end of the acousto-optic modulator connects arteries and veins
The input terminal of stamp erbium-doped fiber amplifier, the output end of impulse type erbium-doped fiber amplifier and the input terminal of filter connect,
The output end of filter and circulator input terminal connect, an output end of circulator and one of wavelength division multiplexer it is defeated
Enter end connection, the output end of wavelength division multiplexer connects sensor fibre；The output end of raman amplifier and wavelength division multiplexer it is another
A input terminal connection；
Another output end of circulator and the input terminal of erbium-doped fiber amplifier connect, the output of erbium-doped fiber amplifier
End is connect with one end of photodiode, and the other end of photodiode is connect with Data Acquisition Card input terminal, Data Acquisition Card
The input terminal of output end and data processing module connects, and the output end of data processing module and the input terminal of waveform generator connect
It connects, the output end of waveform generator and another input terminal of acousto-optic modulator connect.
Above-mentioned technical proposal is connect, the sensing optic cable is sensitizing type armouring single mode fiber cable.
Above-mentioned technical proposal is connect, the laser is super-narrow line width laser.
The freeway guardrail collision accident alarm based on φ-OTDR distributing optical fiber sensings that the present invention also provides a kind of
System, the system include in sensing optic cable, such as above-mentioned technical proposal based on φ-OTDR distributed optical fiber vibration sensing system masters
Machine, interchanger and monitoring client；
The sensing optic cable is laid on freeway guardrail, and is passed based on φ-OTDR distributed optical fiber vibrations with described
Sensing system host connects；
It is described to be connect with interchanger based on φ-OTDR distributed optical fiber vibration sensing system hosts；
The interchanger is connect by network with monitoring client and mobile terminal.
The present invention also provides a kind of methods of distributing optical fiber sensing based on the above-mentioned technical proposal, including following step
Suddenly：
The continuous light that laser is sent out is modulated into the pulsed light of one fixed width and frequency by acousto-optic modulator；
Pulsed light is amplified by impulse type erbium-doped fiber amplifier, and spontaneous emission noise is filtered out using filter, is passed through
Circulator is incident on wavelength division multiplex device；
The Raman light of raman amplifier output is inputted by wavelength division multiplexer, and pulsed light and Raman light are injected into sensor fibre
In；
Reflected Rayleigh scattering signal is incident in impulse type erbium-doped fiber amplifier by circulator and is amplified,
Opto-electronic conversion is carried out by photodiode again, is acquired finally by Data Acquisition Card, input data processing module；
Data processing module carries out adjacent or interval pulse signal difference processing to the data of acquisition, and by difference result
It is compared with default differential threshold, differential threshold is preset if it is greater than or equal to this, then judge the point for suspicious accident point, and to this
Point carries out pattern-recognition；
Judge whether it is Vehicular impact by pattern-recognition, if so, waveform generator changes its impulse ejection frequency, number
Extract the voice signal in gathered data simultaneously according to processing module.
Above-mentioned technical proposal is connect, when accident does not occur, the frequency of waveform generator transmitting is 500Hz, when accident occurs
When, the frequency of transmitting is 3000Hz.
The beneficial effect comprise that：The present invention is based on the freeway guardrails of φ-OTDR distributing optical fiber sensings
Collision accident alarm system has many advantages, such as that electromagnetism interference, corrosion-resistant, distance sensing is remote, can be in the item of low wrong report and low drain report
Under part, twenty four hours, it is round-the-clock multiply personnel safety for highway superior and provide safeguard, and burst accident can be carried out accurate
Positioning especially at night, dense fog, rainy day visual isopter it is unknown under the conditions of.By adjusting impulse ejection frequency, single point signals are improved
Sample rate acquires audio frequency vibration signal, and carries out corresponding rescue measure, ensures the safety of driver and conductor.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is that the present invention is based on the alarm of the freeway guardrail collision accident of φ-OTDR distributing optical fiber sensings and scenes
The structural schematic diagram of voice extraction system；
Fig. 2 is based on φ-OTDR distributed optical fiber vibration sensing system host structure charts；
Fig. 3 is that normality and accident state inject light pulse schematic diagram in sensor fibre；
Fig. 4 is flow chart of data processing figure.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, Fig. 1 is the highway shield provided in an embodiment of the present invention based on φ-OTDR distributing optical fiber sensings
Column collision accident alarm system scheme of installation.
In Fig. 1 embodiments, the freeway guardrail collision accident alarm system packet based on φ-OTDR distributing optical fiber sensings
Include sensing optic cable 2, based on φ-OTDR distributed optical fiber vibration sensing systems host 3, interchanger 4, network 5, monitoring client 6 and shifting
Moved end 7.Sensing optic cable 2 is fixed on freeway guardrail 1.
Wherein, armouring enhanced sensitivity single mode fiber cable can be selected in sensing optic cable 1.
It is connected by optical patchcord with sensing optic cable 2 based on φ-OTDR distributed optical fiber vibration sensing systems host 3.It is main
Machine 3 injects the pulsed light with high coherence into sensing optic cable 2, and receives the backward Rayleigh scattering letter of subsidiary heat transfer agent
Number.When there is shock fence accident to occur, the refractive index of optical cable changes, and then influences backward Rayleigh scattering light in pulsed light
Phase, so that the amplitude of coherent light is changed, returned in distributed optical fiber vibration sensing system host 3 by sensing optic cable 2
Carry out opto-electronic conversion and data processing.Distributed optical fiber vibration sensing system host 3 is connected with interchanger 4, and interchanger 4 accesses net
Network system 5.Alarm signal can check displaying in monitoring client 6, can push to mobile terminal 7.The alarm signal is shaken by distribution type fiber-optic
Dynamic sensor-based system host generates, and distributed optical fiber vibration sensing system host can generate comprising spot, the time, type, show
The message package of field voice.
Fig. 2 is based on φ-OTDR distributed optical fiber vibration sensing system host structure charts, including laser 201, acousto-optic tune
Device (AOM) 202 processed, impulse type erbium-doped fiber amplifier (EDFA) 203,100G filters 204, circulator 205, wavelength division multiplexer
(WDM) 206, raman amplifier 207, erbium-doped fiber amplifier (EDFA) 208, photodiode (PIN) 209, Data Acquisition Card
210, data processing module 211 and waveform generator 212.
The output end of laser 202 is connect with an input terminal of acousto-optic modulator 202, the acousto-optic modulator 202 it is defeated
Outlet connects the input terminal of impulse type erbium-doped fiber amplifier 203, the output end of impulse type erbium-doped fiber amplifier 203 and filtering
The input terminal of device 204 connects, and the output end of filter 204 is connect with an input terminal of circulator 205, and the one of circulator 205
A output end is connect with an input terminal of wavelength division multiplexer 212, and the output end of wavelength division multiplexer 212 connects sensor fibre；It draws
The output end of graceful amplifier 207 is connect with another input terminal of wavelength division multiplexer 212；
Another output end of circulator 205 is connect with the input terminal of erbium-doped fiber amplifier 203, erbium-doped fiber amplifier
203 output end is connect with one end of photodiode 209, and the other end and the Data Acquisition Card 210 of photodiode 209 input
The input terminal of end connection, 210 output end of Data Acquisition Card and data processing module connects, the output end of data processing module 211
It is connect with the input terminal of waveform generator 212, the output end of waveform generator 212 and another input of acousto-optic modulator 202
End connection.
Laser 201 is super-narrow line width laser 201, and the continuous light sent out is adjusted by acousto-optic modulator (AOM) 202
Be made one fixed width, certain frequency pulsed light, impulse type erbium-doped fiber amplifier (EDFA) 203, using 100G filters
204 filter out spontaneous emission noise, are incident on wavelength division multiplex device (WDM) 206 by circulator 205, raman amplifier 207 passes through
Circulator is incident on wavelength division multiplex device (WDM) 206, and pulsed light and Raman light are injected into sensor fibre.Carry heat transfer agent
Backward Rayleigh scattering signal be incident in erbium-doped fiber amplifier (EDFA) 208 and be amplified by circulator 205, then pass through
Photodiode (PIN) 209 acquires 210, input data processing module 211 finally by capture card.Waveform generator 212 is normal
Acousto-optic modulator (AOM) 202 is controlled under state, generation pulse width is 100ns, and frequency is the light pulse of 500Hz.Work as data processing
After module 211 monitors accident event, the signal that instruction adjustment waveform generator 212 generates is sent, effect is to generate frequency
For the light pulse of 3000Hz.
Laser 201 provides continuous coherent light, low phase noise and relative intensity noise, line width 1.5kHz.
Acousto-optic modulator (AOM) 202, is pulse signal by continuous light modulation, and extinction ratio is high.
Raman amplifier 207 can compensate for the decaying of light in a fiber.
The backward Rayleigh scattering signal for carrying heat transfer agent is converted to optical signal by photodiode (PIN) 209, dark electricity
It flows small.
Data processing module 211, driving acousto-optic modulator (AOM) 202 generate pulsed light, receive data processing module 211
Instruction adjusts drive waveforms, generates the light pulse of different frequency.
It will be retouched in detail below optical pulse frequency under the light impulse length and different mode that are arranged in embodiment
It states：
Spread speed is V to light in a fiberg, injection optical pulse frequency is f, pulse width W.
Spatial resolution is：Wherein SR is spatial resolution.Pulse width W more large space resolution ratio more
Low, pulse width W is smaller, and the signal received is weaker, and signal-to-noise ratio is poorer.
In order to avoid aliasing occurs to Rayleigh scattering signal after two pulsed lights, optical pulse frequency f and distance sensing are injected
There are certain relationships, and distance sensing is bigger, and the pulse frequency upper limit is smaller.Relationship is as follows：
For example, when injected pulse light pulsewidth is 100ns, frequency is that (frequency of speaking mostly concentrates on 85Hz- to 3000Hz
When 1100Hz), spatial resolution 10m, theoretic BURN-THROUGH RANGE be 33.3km, due to the delay above circuit with
And 33.3km is not achieved in redundant optical fiber, actual distance sensing, the detection length selected in embodiment is 30km.
Such as Fig. 3, pulse signal when top half is no event, lower half portion is pulse signal when having crash.
Referring to Fig. 4,211 data process method flow chart of data processing module.Distributed optical fiber vibration sensing system under normality
The light pulse signal that system host is sent out is 100ns, 500Hz, by receiving coherent rayleigh scattered signal, and carries out adjacent or interval
The difference processing of pulse signal sets a threshold value, and differential threshold is far below setting threshold value under normality, when there is bump rail accident
When, reach the differential threshold of setting, judges the point for suspicious accident point at this time.It is pre- to judge while eliminating enhanced sensitivity optical cable because other
Interference caused by vibration.Suspicious accident point is labeled as to the point more than differential threshold, pattern-recognition is carried out to the point.Determine whether
It is Vehicular impact, eliminates and artificially cross etc. other false signals.Waveform generator can be according to processing unit as a result, changing its pulse
Tranmitting frequency, with the signal identification under pulse normality, the voice under accident condition extracts.Normality frequency is 500Hz, accident condition
Lower frequency is 3000Hz.After pulse frequency is increased to 3000Hz, at this moment highest can demodulate to obtain frequency to be shaking for 1500Hz
Dynamic signal, sensitizing type sensing optic cable responds sound signal near sensing point, so as to extract accident point voice signal.Simultaneously
Data processing module 211 also generate comprising spot, the time, type, field speech signal message package.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
1. one kind being based on φ-OTDR distributed optical fiber vibration sensing system hosts, which is characterized in that including laser, acousto-optic tune
Device processed, impulse type erbium-doped fiber amplifier, filter, circulator, wavelength division multiplexer, raman amplifier, erbium-doped fiber amplifier,
Photodiode, Data Acquisition Card, data processing module and waveform generator；
The output end of laser and acousto-optic modulator input terminal connect, and the output end of the acousto-optic modulator connects impulse type
The input terminal of erbium-doped fiber amplifier, the output end of impulse type erbium-doped fiber amplifier and the input terminal of filter connect, filtering
The output end of device and circulator input terminal connect, an output end of circulator and an input terminal of wavelength division multiplexer
The output end of connection, wavelength division multiplexer connects sensor fibre；Another of the output end of raman amplifier and wavelength division multiplexer are defeated
Enter end connection；
The input terminal of another output end of circulator and erbium-doped fiber amplifier connects, the output end of erbium-doped fiber amplifier with
One end of photodiode connects, and the other end of photodiode is connect with Data Acquisition Card input terminal, Data Acquisition Card output
End is connect with the input terminal of data processing module, and the output end of data processing module and the input terminal of waveform generator connect, wave
The output end of shape generator and another input terminal of acousto-optic modulator connect.
2. optical fiber vibration sensing system host according to claim 1, which is characterized in that the sensing optic cable is sensitizing type
Armouring single mode fiber cable.
3. optical fiber vibration sensing system host according to claim 1, which is characterized in that the laser is super-narrow line width
Laser.
4. a kind of freeway guardrail collision accident alarm system based on φ-OTDR distributing optical fiber sensings, which is characterized in that
The system includes sensing optic cable, is based on φ-OTDR distributed optical fiber vibration sensing systems host as described in claim 1, hands over
It changes planes and monitoring client；
The sensing optic cable is laid on freeway guardrail, and is based on φ-OTDR distributed optical fiber vibration sensings system with described
Host of uniting connects；
It is described to be connect with interchanger based on φ-OTDR distributed optical fiber vibration sensing system hosts；
The interchanger is connect by network with monitoring client and mobile terminal.
5. a kind of freeway guardrail collision accident alarm based on φ-OTDR distributing optical fiber sensings based on claim 4
Method, which is characterized in that include the following steps：
The continuous light that laser is sent out is modulated into the pulsed light of one fixed width and frequency by acousto-optic modulator；
Pulsed light is amplified by impulse type erbium-doped fiber amplifier, spontaneous emission noise is filtered out using filter, by annular
Device is incident on wavelength division multiplex device；
The Raman light of raman amplifier output is inputted by wavelength division multiplexer, and pulsed light and Raman light are injected into sensor fibre；
Reflected Rayleigh scattering signal is incident in impulse type erbium-doped fiber amplifier by circulator and is amplified, then is led to
It crosses photodiode and carries out opto-electronic conversion, acquired finally by Data Acquisition Card, input data processing module；
Data processing module carries out adjacent or interval pulse signal difference processing to the data of acquisition, and by difference result and in advance
If differential threshold is compared, differential threshold is preset if it is greater than or equal to this, then judges the point for suspicious accident point, and to the click-through
Row pattern-recognition；
Judge whether it is Vehicular impact by pattern-recognition, if so, waveform generator changes its impulse ejection frequency, at data
Reason module extracts the voice signal in gathered data simultaneously.
6. this method according to claim 5, which is characterized in that when accident does not occur, the frequency of waveform generator transmitting
Rate is 500Hz, and when an accident occurs, the frequency of transmitting is 3000Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711491029.4A CN108287017B (en) | 2017-12-30 | 2017-12-30 | Highway guardrail collision accident alarm system based on phi-OTDR optical fiber sensing |
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|---|---|---|---|
| CN201711491029.4A CN108287017B (en) | 2017-12-30 | 2017-12-30 | Highway guardrail collision accident alarm system based on phi-OTDR optical fiber sensing |
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| CN108287017B CN108287017B (en) | 2020-08-04 |
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| CN109872505A (en) * | 2019-03-25 | 2019-06-11 | 武汉理工大学 | A kind of freeway guardrail alarm system and method based on optical fiber micro-vibration |
| CN111147133A (en) * | 2019-12-24 | 2020-05-12 | 武汉理工光科股份有限公司 | Real-time monitoring system and method for traffic flow based on phi-OTDR |
| CN111458059A (en) * | 2019-01-21 | 2020-07-28 | 中国科学院上海光学精密机械研究所 | Continuous vehicle collision detection system and method thereof |
| WO2020157917A1 (en) * | 2019-01-31 | 2020-08-06 | 日本電気株式会社 | Optical fiber sensing system, state detection device, state detection method, and computer-readable medium |
| CN111854921A (en) * | 2020-07-28 | 2020-10-30 | 武汉理工光科股份有限公司 | Distributed optical fiber deceleration strip vibration early warning system and method |
| CN113838300A (en) * | 2021-09-26 | 2021-12-24 | 武汉理工大学 | Non-blind area real-time monitoring and alarming system for expressway emergency |
| CN113870578A (en) * | 2021-11-02 | 2021-12-31 | 陆航安防工程(上海)股份有限公司 | Road guardrail intelligent detection system and detection method thereof |
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| CN111854921A (en) * | 2020-07-28 | 2020-10-30 | 武汉理工光科股份有限公司 | Distributed optical fiber deceleration strip vibration early warning system and method |
| CN113838300A (en) * | 2021-09-26 | 2021-12-24 | 武汉理工大学 | Non-blind area real-time monitoring and alarming system for expressway emergency |
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