CN104574742A - Optical fiber perimeter security system based on phi-OTDR technology - Google Patents
Optical fiber perimeter security system based on phi-OTDR technology Download PDFInfo
- Publication number
- CN104574742A CN104574742A CN201510002274.9A CN201510002274A CN104574742A CN 104574742 A CN104574742 A CN 104574742A CN 201510002274 A CN201510002274 A CN 201510002274A CN 104574742 A CN104574742 A CN 104574742A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- signal
- core sensing
- optic cable
- sensing optic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 88
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 238000000253 optical time-domain reflectometry Methods 0.000 title claims abstract description 13
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000007405 data analysis Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 7
- 239000000835 fiber Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 230000006399 behavior Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000009194 climbing Effects 0.000 description 6
- 238000010606 normalization Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009545 invasion Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
- G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
- G08B13/186—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using light guides, e.g. optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses an optical fiber perimeter security system based on a phi-OTDR technology, which comprises a signal transmitter, a signal processor and a double-core sensing optical cable, wherein the signal transmitter injects pulse light into two optical fibers in the double-core sensing optical cable from opposite directions, the signal processor detects backward Rayleigh scattering light in the double-core sensing optical cable and obtains an on-site vibration signal according to the backward Rayleigh scattering light, when the double-core sensing optical cable is cut, the two optical fibers in the double-core sensing optical cable and the rear end part connected with the signal transmitter alternately return signals, adjacent two groups of signals are combined to obtain a group of perimeter vibration signals, and the cut position of the double-core sensing optical cable is determined based on the perimeter vibration signals. The embodiment of the invention provides the optical fiber perimeter security system based on the phi-OTDR technology, which can still detect the intrusion event when the optical fiber is cut off so as to improve the security detection precision.
Description
Technical field
The present invention relates to technical field of security and protection, be specifically related to a kind of based on phase sensitive optical time domain reflectometer (Phase-Senstitive Optical Time Domain Reflectometer, abbreviation: Φ-OTDR) the optical fiber perimeter safety-protection system of technology.
Background technology
In prior art, stand field and valve chamber are as the key facility of oil and gas pipes and pivotability engineering, once be destroyed, the short time cannot repair, and will directly affect the normal production of pipeline; Simultaneously oil and gas leakage can cause serious environmental pollution, and pole fire hazardous, blast, the life security of serious threat periphery personnel.Increasingly serious along with national anti-terrorism situation, and the continuous increase to key area security protection demands such as Oil and gas stations, all kinds of circumference security and guard technology based on sensor technology constantly occurs.Wherein, optical fiber perimeter security and guard technology owing to having essential safety, high sensitivity, deploy troops on garrison duty flexibly, the plurality of advantages such as electromagnetism interference, adopted by numerous oil-gas stations place.
But, the multiple techniques and methods utilizing fiber optic sensor technology to carry out perimeter security strick precaution is normally adopted in prior art, this kind of technology is mainly based on the optical fiber perimeter security and guard technology that traditional OTDR or fibre optic interferometer principle research and develop, utilize OTDR technology and non-equilibrium Mach-Zehnder interferometer composition sensing positioning system, Mach-Zehnder interferometer is utilized to demodulate phase information from backward Rayleigh scattering light, protective alarming and location can be realized, but invade if there is position multiple in defence area simultaneously, when the sensor fibre in this system once invaded person cuts off, cut off part and will be lost warning positioning function, the intrusion behavior occurred in this part can not be detected, thus there is the low problem of accuracy of detection.
Summary of the invention
The embodiment of the present invention, by providing a kind of optical fiber perimeter safety-protection system based on Φ-OTDR technology, when optical fiber is cut off, still can detect intrusion event, to improve safety detection precision.
Embodiments provide a kind of optical fiber perimeter safety-protection system based on Φ-OTDR technology, described system comprises signal projector, signal processor and twin-core sensing optic cable, wherein, described signal projector is the other way around respectively to two optical fiber injected pulse light in described twin-core sensing optic cable, described signal processor detects the backward Rayleigh scattering light in described twin-core sensing optic cable, on-the-spot vibration signal is obtained according to described backward Rayleigh scattering light, wherein, when described twin-core sensing optic cable is cut off, the rear end part that two optical fiber in described twin-core sensing optic cable are connected with described signal projector alternately passes signal back, two adjacent groups signal is merged, obtain one group of circumference vibration signal, based on described circumference vibration signal, determine that described twin-core sensing optic cable is by the position of cutting off.
Optionally, described signal projector comprises the laser instrument driving and protective device, narrow linewidth laser, power amplifier, optical fiber filter, the first coupling mechanism, light pulse modulator and optical fiber circulator that are connected in series successively.
Optionally, described signal projector also comprises impulse controller, and described impulse controller is connected with described light pulse modulator, by described impulse controller, pulsed light is alternately incided in described twin-core sensing optic cable through described optical fiber circulator.
Optionally, described signal processor comprises the second coupling mechanism, prime amplifier, optical fiber filter, photodetector, signal conditioner, data acquisition unit and the data analysis processor that are connected in series successively, wherein, described second coupling mechanism is connected with the output terminal of described optical fiber circulator.
The one or more technical schemes provided in the embodiment of the present invention, at least have following technique effect or advantage:
Because signal projector in the embodiment of the present application is to twin-core sensing optic cable injected pulse light, signal processor detects the backward Rayleigh scattering light in described twin-core sensing optic cable, on-the-spot vibration signal is obtained according to described backward Rayleigh scattering light, when described twin-core sensing optic cable is cut off, the rear end part that two optical fiber in described twin-core sensing optic cable are connected with described signal projector alternately passes signal back, two adjacent groups signal is merged, obtain one group of circumference vibration signal, based on described circumference vibration signal, determine that described twin-core sensing optic cable is by the position of cutting off, so, can when optical fiber be cut off, can determine that described twin-core sensing optic cable is by the position of cutting off accurately, and after described twin-core sensing optic cable is cut off, because described signal projector is the other way around respectively to two optical fiber injected pulse light in described twin-core sensing optic cable, make two optical fiber be connected with described signal projector still can form a complete loop, so, make still normally intrusion event to be detected after described twin-core sensing optic cable is cut off, thus safety detection precision is improved.
Accompanying drawing explanation
Fig. 1 is the first Organization Chart of optical fiber perimeter safety-protection system in the embodiment of the present invention;
Fig. 2 is the oscillogram of the vibration signal that in the embodiment of the present invention, optical fiber perimeter safety-protection system is monitored when optical fiber does not cut off;
Fig. 3 is the oscillogram of the vibration signal that in the embodiment of the present invention, optical fiber perimeter safety-protection system is monitored when optical fiber cuts off;
Fig. 4 is the optical fiber perimeter safety-protection system normalization characteristic structural drawing that the vibration signal that monitors is corresponding when there is climbing fence in the embodiment of the present invention;
Fig. 5 is the optical fiber perimeter safety-protection system normalization characteristic structural drawing that the vibration signal that monitors is corresponding when occurring shearing fence in the embodiment of the present invention;
Fig. 6 is the normalization characteristic structural drawing that vibration signal that in the embodiment of the present invention, optical fiber perimeter safety-protection system monitors when there is electric impact drill is corresponding;
Fig. 7 is the second Organization Chart of optical fiber perimeter safety-protection system in the invention process;
Fig. 8 is that in the invention process, the multiple vibration events of optical fiber safety-protection system to diverse location monitor the vibration signal figure obtained simultaneously;
Fig. 9 is vibration signal acoustical power-time plot that in the embodiment of the present invention, optical fiber perimeter safety-protection system monitors when there is climbing fence;
Figure 10 is vibration signal acoustical power-time plot that in the embodiment of the present invention, optical fiber perimeter safety-protection system monitors when there is shearing fence;
Figure 11 is the spectrogram of the vibration signal that in the embodiment of the present invention, optical fiber perimeter safety-protection system monitors when there is climbing fence;
Figure 12 is the spectrogram of the vibration signal that in the embodiment of the present invention, optical fiber perimeter safety-protection system monitors when there is shearing fence.
Embodiment
The embodiment of the present invention, by providing a kind of optical fiber perimeter safety-protection system based on Φ-OTDR technology, when optical fiber is cut off, still can detect intrusion event, to improve safety detection precision.
Due to the randomness density fluctuation that optical fiber Atom or molecule space distribute, cause optical fiber on microcosmic, there is the different tiny area of refractive index, form some scattering centers.Incident light, through these scattering centers, to all the winds can send the subwave of same frequency.If the coherent length long enough of light source, then these backward Rayleigh scattering lights will superpose mutually, form long or destructive interference mutually, and form interference pattern.When optical fiber external environment immobilizes, the intensity distributions pattern of backward Rayleigh scattering is changeless.When extraneous vibration causes disturbance to optical fiber, the local indexes of refraction in optical fiber is caused to change, thus the phase place of Rayleigh scattering in optical fiber is changed, also corresponding change can be there is in the relevant pattern of the backward Rayleigh scattering light now obtained, the embodiment of the present invention is by analyzing these changes, the vibration signal that the circumference in the monitoring places such as such as oil-gas stations is along the line can be detected, thus realize the station monitoring in monitoring place, field and the identification to intrusion behavior.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
See Fig. 1, one embodiment of the invention provides a kind of optical fiber perimeter safety-protection system based on Φ-OTDR technology, described system comprises signal projector 5, signal processor 6 and twin-core sensing optic cable 3, wherein, signal projector 6 is the other way around respectively to the optical fiber injected pulse light of two in twin-core sensing optic cable 3, signal processor 5 detects the backward Rayleigh scattering light in twin-core sensing optic cable 3, on-the-spot vibration signal is obtained according to described backward Rayleigh scattering light, wherein, when twin-core sensing optic cable 3 is cut off, the rear end part that two optical fiber in twin-core sensing optic cable 3 are connected with signal projector 6 alternately passes signal back, two adjacent groups signal is merged, obtain one group of circumference vibration signal, based on described circumference vibration signal, determine that twin-core sensing optic cable 3 is by the position of cutting off.
Wherein, twin-core sensing optic cable 3 is specially the sensing optic cable comprising two core sensor fibres.
Concrete, see Fig. 1, when described monitoring place comprises wire fence 2 and circumference enclosure wall 1, wire fence 2 is installed on circumference enclosure wall 1 top, and twin-core sensing optic cable 3 colligation on wire fence 2, and is connected to signal projector 5, light source in signal projector 5 respectively from the head end of optical fiber and tail end alternately to transponder pulse light two core sensing optic cables 3, when invader 4 climbs or shear effect of vibration that wire fence produces in twin-core sensing optic cable 3, refractive index in optical fiber in twin-core sensing optic cable 3, length, core diameters etc. can produce subtle change, the phase place of this place's light signal is caused to change, and light source adopts high-coherence light source in signal projector 5, in every single optical fibre, light wave is interfered mutually due to backward coherent rayleigh scattering, the change of phase place is made finally to cause the change of Rayleigh scattering light intensity, signal processor 6 identifies for collecting light intensity signal in two core sensor fibres in twin-core sensing optic cable 3 and carrying out analysis to signal, judge whether that intrusion behavior occurs.
Concrete, represent circumferential length see L in Fig. 2, figure, T represents the time, and V+ represents Oscillation Amplitude.The pulsed light that light source sends incides the head end of the first core sensor fibre in twin-core sensing optic cable 3 and the tail end of the second core sensor fibre according to time order and function sequence alternate, light wave is propagated in opposite direction respectively in two core fibres, signal processor 6 gets the backward Rayleigh scattering light alternately passed back by first, second core sensor fibre, because optical propagation direction is contrary, therefore obtain waveform alternately symmetrical in chronological order, round dot represents that same position on circumference is at not vibration signal in the same time.
Concrete, when the two core sensing optic cables 3 of invader's 4 pairs of colligations on fence implement shear failure, two optical fiber in two core sensing optic cables 3 are cut off into 2, front-end and back-end part respectively, as shown in Figure 3, solid line is the rear end part connecting light source, and dotted line is fore-end, l
ofor optical cable is cut off position, cannot forward end continue to propagate after pulsed optical signals propagates into the sheared edge of the rear end connecting light source, front end sensor fibre loses sensing function, but according to coherent rayleigh scattering principle, the rear end part connecting light source still can continue normal work as sensor fibre, two optical fiber rear ends alternately pass signal back, are merged by two adjacent groups signal, can obtain one group of complete circumference vibration signal.Therefore, the present invention has anti-shearing characteristic, after sensing optic cable is cut off, still can carry out distributed monitoring to the multiple spot intrusion behavior that circumference occurs simultaneously.
So, make after described twin-core sensing optic cable is cut off, because signal projector 5 is the other way around respectively to the optical fiber injected pulse light of two in twin-core sensing optic cable 4, make two optical fiber be connected with signal projector 5 still can form a complete loop, namely as shown in the solid line of Fig. 3, so, make still normally intrusion event to be detected after twin-core sensing optic cable 3 is cut off, improve safety detection precision further.
Concrete, when analyzing circumference vibration signal, for same position at not vibration signal in the same time, before and after every, 5 groups of signals are once averaged calculating, using obtained average as the vibration signal of this position, as shown in Equation 1:
Wherein, s (i) represents i-th group of vibration signal of a certain position, s (x) represents the vibration signal of this position after average, signal processor 5 carries out i layer wavelet decomposition by db3 wavelet transformation to signal, obtain one group of approximation wavelet coefficients and i group detail wavelet coefficients, calculated the wavelet coefficient energy of each frequency range by formula (2):
Wherein, f
ithe N point wavelet coefficient of t the i-th frequency range that () obtains for wavelet transformation, E (f
i(t)) the wavelet coefficient energy value that obtains through all square computing for this frequency range wavelet coefficient.
Be normalized by wavelet coefficient energy, normalization formula (3) is shown below:
E (k) represents the wavelet coefficient energy value of each frequency range after normalized.Adopt normalized wavelet coefficient energy as the proper vector of vibration signal, be respectively climbing fence see Fig. 4, Fig. 5, Fig. 6, shear the normalization characteristic value that fence, electric impact drill destruction three kinds of vibration signals to body of wall obtain after feature extraction; Adopt perceived control as online classification and identification algorithm, energy feature is inputted perceptron, ONLINE RECOGNITION is carried out to invasion signal, thus fence can be climbed, shear fence, electric impact drill to intrusion behaviors such as the destructions of body of wall by accurate recognition.Through test, native system reaches 96.5% to intrusion behavior recognition correct rate.
Concrete, see Fig. 7, the optical fiber perimeter safety-protection system that the present invention is based on Φ-OTDR technology comprises signal projector 5, signal processor 6 and twin-core sensing optic cable 3, signal projector 5 is to twin-core sensing optic cable 3 injected pulse light, signal processor 6 detects the backward Rayleigh scattering light in twin-core sensing optic cable 3 and carries out data processing, and signal projector 5 comprises the laser instrument be connected in series successively and drives and protective device, narrow linewidth laser, power amplifier, optical fiber filter, the first coupling mechanism, light pulse modulator and optical fiber circulator; Signal processor 6 also comprises impulse controller, and described impulse controller is connected with described light pulse modulator, by described impulse controller, pulsed light is alternately incided in described twin-core sensing optic cable through described optical fiber circulator.
Concrete, because twin-core sensing optic cable 3 comprises first, second core fibre, so, light pulse modulator and optical fiber circulator is made all to have two covers respectively, connect first respectively, second core fibre, concrete, signal projector 5 comprises the laser instrument be connected in series successively and drives and protective device 501, narrow linewidth laser 502, power amplifier 503, optical fiber filter 504, first coupling mechanism 505, light pulse modulator 506 and optical fiber circulator 507, and first coupling mechanism 505 be also connected in series light pulse modulator 508 and optical fiber circulator 509 successively, and also comprise the impulse controller 510 be connected with light pulse modulator 506 and the impulse controller 511 be connected with light pulse modulator 508.
Wherein, signal processor 6 comprises the second coupling mechanism 601, prime amplifier 602, optical fiber filter 603, photodetector 604, signal conditioner 605, data collector 606 and the Data Analysis Services device 607 that are connected in series successively, wherein, the second coupling mechanism 601 is connected with the output terminal of optical fiber circulator 507 and optical fiber circulator 509 respectively.
Further, laser instrument drives and protective device 501 drives and Bright Source Protection for narrow linewidth laser 502 provides, power amplifier 503 is exported to through internal insulation device after narrow linewidth laser 502 exports continuous light wave, through amplification continuous light wave by optical fiber filter 504 and the first coupling mechanism 502 after enter light pulse modulator 506 and light pulse modulator 508 respectively, the modulation duty cycle of pulse-modulator 506 is regulated by impulse controller 510, the modulation duty cycle of pulse-modulator 508 is regulated by impulse controller 511, by gating pulse controller 510 and impulse controller 511, pulsed light is made to enter in two sensor fibres according to time order and function sequence alternate by optical fiber circulator 507 and optical fiber circulator 509, the backward Rayleigh scattering light that two sensor fibres reflect alternately enters the second coupling mechanism 601 through optical fiber circulator, enter prime amplifier 602 subsequently, light signal after amplifying is converted to voltage signal through optical fiber filter 603 and photodetector 604 successively, voltage signal is by entering data collector 606 after signal conditioner 605 noise reduction, and the signal collected enters Data Analysis Services device 607 and carries out analysis identification.
In actual application, see Fig. 8, optical fiber perimeter safety-protection system of the present invention can be monitored multiple vibration events of diverse location simultaneously, and the minimum resolution distance of multiple event is determined by the spatial resolution of system.The vibration signal that when curve is a certain, etching system collects on each position of circumference is shown in figure, only highly relevant due to injection fibre, the result of the vibration signal curve therefore the collected Rayleigh scattering interference of light that to be exactly pulsed light return in sensor fibre internal reflection, vibration event a and vibration event b be according to above-mentioned positioning principle obtain at the simultaneous vibration event of circumference diverse location, a transverse axis correspondence position l
1, b transverse axis correspondence position l
2.
Further, see Fig. 9 and Figure 10, when on circumference, a certain position invader climbs fence and shears fence, acoustical power-time curve that optical fiber perimeter safety-protection system of the present invention collects, optical fiber perimeter safety-protection system of the present invention can the acoustical power curve of-5 ~+5 seconds internal vibration signals that occurs of automatic recording exceptional vibration, see Figure 11 and Figure 12, shown curve is respectively the climbing corresponding to Fig. 9, shear 0 ~ 600Hz spectrum curve of fence signal, from Fig. 8, can find out in Fig. 9 and Figure 10, different classes of invasion signal has obvious difference in the energy distribution of each frequency range, system software by wavelet transformation by each signal decomposition to different frequency range, ask for each frequency band signals mean square deviation as energy feature, composition characteristic vector after normalization.Adopt perceived control as online classification and identification algorithm, proper vector is inputted perceptron, invasion signal is identified and sends sound and light alarm.Through test, the intrusion behavior recognition correct rate of the optical fiber perimeter safety-protection system in the present invention reaches 96.5%.
The one or more technical schemes provided in the embodiment of the present invention, at least have following technique effect or advantage:
Because signal projector in the embodiment of the present application is to twin-core sensing optic cable injected pulse light, signal processor detects the backward Rayleigh scattering light in described twin-core sensing optic cable, on-the-spot vibration signal is obtained according to described backward Rayleigh scattering light, when described twin-core sensing optic cable is cut off, the rear end part that two optical fiber in described twin-core sensing optic cable are connected with described signal projector alternately passes signal back, two adjacent groups signal is merged, obtain one group of circumference vibration signal, based on described circumference vibration signal, determine that described twin-core sensing optic cable is by the position of cutting off, so, can when optical fiber be cut off, can determine that described twin-core sensing optic cable is by the position of cutting off accurately, and after described twin-core sensing optic cable is cut off, because described signal projector is the other way around respectively to two optical fiber injected pulse light in described twin-core sensing optic cable, make two optical fiber be connected with described signal projector still can form a complete loop, so, make still climbing fence can normally be detected after described twin-core sensing optic cable is cut off, shear the intrusion events such as fence, thus safety detection precision is improved.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvement, and these improvement also should be considered as protection scope of the present invention.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. the optical fiber perimeter safety-protection system based on Φ-OTDR technology, it is characterized in that, described system comprises signal projector, signal processor and twin-core sensing optic cable, wherein, described signal projector is the other way around respectively to two optical fiber injected pulse light in described twin-core sensing optic cable, described signal processor detects the backward Rayleigh scattering light in described twin-core sensing optic cable, on-the-spot vibration signal is obtained according to described backward Rayleigh scattering light, wherein, when described twin-core sensing optic cable is cut off, the rear end part that two optical fiber in described twin-core sensing optic cable are connected with described signal projector alternately passes signal back, two adjacent groups signal is merged, obtain one group of circumference vibration signal, based on described circumference vibration signal, determine that described twin-core sensing optic cable is by the position of cutting off.
2. the system as claimed in claim 1; it is characterized in that, described signal projector comprises the laser instrument be connected in series successively and drives and protective device, narrow linewidth laser, power amplifier, optical fiber filter, the first coupling mechanism, light pulse modulator and optical fiber circulator.
3. system as claimed in claim 2, it is characterized in that, described signal projector also comprises impulse controller, and described impulse controller is connected with described light pulse modulator, by described impulse controller, pulsed light is alternately incided in described twin-core sensing optic cable through described optical fiber circulator.
4. system as claimed in claim 3, it is characterized in that, described signal processor comprises the second coupling mechanism, prime amplifier, optical fiber filter, photodetector, signal conditioner, data acquisition unit and the data analysis processor that are connected in series successively, wherein, described second coupling mechanism is connected with the output terminal of described optical fiber circulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002274.9A CN104574742B (en) | 2015-01-04 | 2015-01-04 | Optical fiber perimeter security system based on phi-OTDR technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002274.9A CN104574742B (en) | 2015-01-04 | 2015-01-04 | Optical fiber perimeter security system based on phi-OTDR technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104574742A true CN104574742A (en) | 2015-04-29 |
| CN104574742B CN104574742B (en) | 2017-06-06 |
Family
ID=53090692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510002274.9A Active CN104574742B (en) | 2015-01-04 | 2015-01-04 | Optical fiber perimeter security system based on phi-OTDR technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104574742B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104183074A (en) * | 2014-08-29 | 2014-12-03 | 武汉理工光科股份有限公司 | Signal enhancement method and system for distributed perimeter system based on time-domain reflectometry technology |
| CN105806465A (en) * | 2016-03-11 | 2016-07-27 | 南京大学 | Novel [phi]-OTDR detection device based on fixed reflection points and detection method thereof |
| CN106228719A (en) * | 2016-08-22 | 2016-12-14 | 上海波汇科技股份有限公司 | A kind of perimeter intrusion detecting system based on Fibre Optical Sensor |
| CN108320420A (en) * | 2018-02-09 | 2018-07-24 | 成都电科光研科技有限公司 | A kind of double parameter OTDR perimeter securities monitoring systems |
| CN108833596A (en) * | 2018-08-05 | 2018-11-16 | 北京吉宝通科技发展有限公司 | A kind of circumference vibration alarming system based on Internet of Things |
| CN109326070A (en) * | 2018-11-22 | 2019-02-12 | 南京派光信息技术有限公司 | A kind of perimeter security system and circumference security monitor method |
| CN109671233A (en) * | 2018-10-12 | 2019-04-23 | 南京派光信息技术有限公司 | A kind of circumference fence based on fiber-optic probe |
| CN110648481A (en) * | 2019-09-12 | 2020-01-03 | 深圳市矽赫科技有限公司 | Calibration method and perimeter alarm device |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| CN113628402A (en) * | 2021-07-19 | 2021-11-09 | 武汉烽理光电技术有限公司 | Distributed vibration sensing intrusion alarm method, device and system |
| CN115371794A (en) * | 2022-10-25 | 2022-11-22 | 杭州水务数智科技股份有限公司 | Underground pipe gallery ground surface construction event positioning method based on distributed optical fiber sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936402A (en) * | 2020-06-29 | 2022-01-14 | 宁波陆禾科技有限公司 | Perimeter security system and security scheme based on distributed optical fiber early warning system and video target identification technology |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355208A (en) * | 1992-06-24 | 1994-10-11 | Mason & Hanger National, Inc. | Distributed fiber optic sensor for locating and identifying remote disturbances |
| CN101573738A (en) * | 2006-12-29 | 2009-11-04 | 普拉德研究及开发股份有限公司 | Fault-tolerant distributed fiber optic intrusion detection |
| CN101871809A (en) * | 2010-06-25 | 2010-10-27 | 北京奥普科达科技有限公司 | Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same |
| CN101922946A (en) * | 2009-06-17 | 2010-12-22 | 复旦大学 | All-fiber positioning monitoring system |
| CN102622840A (en) * | 2012-04-09 | 2012-08-01 | 北京交通大学 | Peripheral security protection system based on single-optical-fiber cable |
| CN102706437A (en) * | 2012-06-13 | 2012-10-03 | 扬州森斯光电科技有限公司 | Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system |
| CN203940239U (en) * | 2013-10-29 | 2014-11-12 | 中国石油天然气股份有限公司 | Pipeline optical fiber safety monitoring and early warning system |
-
2015
- 2015-01-04 CN CN201510002274.9A patent/CN104574742B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355208A (en) * | 1992-06-24 | 1994-10-11 | Mason & Hanger National, Inc. | Distributed fiber optic sensor for locating and identifying remote disturbances |
| CN101573738A (en) * | 2006-12-29 | 2009-11-04 | 普拉德研究及开发股份有限公司 | Fault-tolerant distributed fiber optic intrusion detection |
| CN101922946A (en) * | 2009-06-17 | 2010-12-22 | 复旦大学 | All-fiber positioning monitoring system |
| CN101871809A (en) * | 2010-06-25 | 2010-10-27 | 北京奥普科达科技有限公司 | Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same |
| CN102622840A (en) * | 2012-04-09 | 2012-08-01 | 北京交通大学 | Peripheral security protection system based on single-optical-fiber cable |
| CN102706437A (en) * | 2012-06-13 | 2012-10-03 | 扬州森斯光电科技有限公司 | Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system |
| CN203940239U (en) * | 2013-10-29 | 2014-11-12 | 中国石油天然气股份有限公司 | Pipeline optical fiber safety monitoring and early warning system |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104183074A (en) * | 2014-08-29 | 2014-12-03 | 武汉理工光科股份有限公司 | Signal enhancement method and system for distributed perimeter system based on time-domain reflectometry technology |
| CN105806465A (en) * | 2016-03-11 | 2016-07-27 | 南京大学 | Novel [phi]-OTDR detection device based on fixed reflection points and detection method thereof |
| CN105806465B (en) * | 2016-03-11 | 2019-01-25 | 南京大学 | A kind of novel Φ-OTDR detection device and its detection method based on fixation reflex point |
| CN106228719A (en) * | 2016-08-22 | 2016-12-14 | 上海波汇科技股份有限公司 | A kind of perimeter intrusion detecting system based on Fibre Optical Sensor |
| CN108320420A (en) * | 2018-02-09 | 2018-07-24 | 成都电科光研科技有限公司 | A kind of double parameter OTDR perimeter securities monitoring systems |
| CN108320420B (en) * | 2018-02-09 | 2024-03-26 | 成都电科光研科技有限公司 | Double-parameter OTDR perimeter safety monitoring system |
| CN108833596B (en) * | 2018-08-05 | 2019-06-21 | 北京吉宝通科技发展有限公司 | A kind of circumference vibration alarming system based on Internet of Things |
| CN108833596A (en) * | 2018-08-05 | 2018-11-16 | 北京吉宝通科技发展有限公司 | A kind of circumference vibration alarming system based on Internet of Things |
| CN109671233A (en) * | 2018-10-12 | 2019-04-23 | 南京派光信息技术有限公司 | A kind of circumference fence based on fiber-optic probe |
| CN109671233B (en) * | 2018-10-12 | 2021-08-10 | 南京派光智慧感知信息技术有限公司 | Perimeter fence based on optical fiber detection |
| CN109326070A (en) * | 2018-11-22 | 2019-02-12 | 南京派光信息技术有限公司 | A kind of perimeter security system and circumference security monitor method |
| CN109326070B (en) * | 2018-11-22 | 2021-01-22 | 南京派光智慧感知信息技术有限公司 | Perimeter security system and perimeter security monitoring method |
| CN110648481A (en) * | 2019-09-12 | 2020-01-03 | 深圳市矽赫科技有限公司 | Calibration method and perimeter alarm device |
| CN110648481B (en) * | 2019-09-12 | 2022-02-15 | 深圳市矽赫科技有限公司 | Calibration method and perimeter alarm device |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| CN113628402A (en) * | 2021-07-19 | 2021-11-09 | 武汉烽理光电技术有限公司 | Distributed vibration sensing intrusion alarm method, device and system |
| CN115371794A (en) * | 2022-10-25 | 2022-11-22 | 杭州水务数智科技股份有限公司 | Underground pipe gallery ground surface construction event positioning method based on distributed optical fiber sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104574742B (en) | 2017-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104574742A (en) | Optical fiber perimeter security system based on phi-OTDR technology | |
| US10620038B2 (en) | Distributed optical fiber sensing signal processing method for safety monitoring of underground pipe network | |
| CN104565826B (en) | Pipeline optical fiber safety monitoring and early warning method and system | |
| CN201191221Y (en) | Disturbance signal determination module of distributed optical fiber vibration sensor system | |
| Fouda et al. | Pattern recognition of optical fiber vibration signal of the submarine cable for its safety | |
| Bai et al. | Detection and identification of external intrusion signals from 33 km optical fiber sensing system based on deep learning | |
| CN104040598B (en) | Interferometer type optical fiber interference detecting apparatus and detection method thereof | |
| CN203940239U (en) | Pipeline optical fiber safety monitoring and early warning system | |
| CN103824406A (en) | Optical fiber sensing-based tunnel cable invasive detection method and system | |
| CN100578168C (en) | Fiber-optic safety guard system for use in oil line | |
| CN104217513B (en) | The method improving phase sensitive optical time domain reflectometer identification intrusion event accuracy rate | |
| CN109374116B (en) | Excavation behavior identification method of buried optical fiber sensing vibration detection system | |
| EP3332272A1 (en) | Method and apparatus for monitoring pipeline using an optical fiber sensor system | |
| CN101684891B (en) | Stress wave and optical fiber sensing compound pipeline safety early warning system | |
| CN104021638A (en) | Method and device for preventing cable along highway from being stolen through early warning | |
| CN105788123B (en) | A kind of method and its system of dynamic realtime monitoring deforestation | |
| CN111537056A (en) | Pipeline along-line third-party construction dynamic early warning method based on SVM and time-frequency domain characteristics | |
| CN110335430A (en) | Monitoring pipeline safety system, method and apparatus based on deep learning | |
| CN101299635B (en) | Apparatus and method for discriminating front and back of wide field complete-optical fiber disturbing signal | |
| CN109064696A (en) | The optical fiber perimeter security system realized based on deep learning | |
| CN203799460U (en) | Tunnel cable intrusion detection system based on optical fiber sensing | |
| CN110631682A (en) | Strain safety monitoring method for cable tunnel bearing body | |
| CN108320420B (en) | Double-parameter OTDR perimeter safety monitoring system | |
| CN109120336A (en) | Anti- false alarm false dismissal method based on phase sensitive optical time domain reflection sensor | |
| Yurchenko et al. | Passive perimeter security systems based on optical fibers of G 652 standard |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211112 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 China Petroleum Building, No. 9, Dongzhimen North Street, Dongcheng District, Beijing Patentee before: PetroChina Company Limited |