CN106683309A - Linkage monitoring system based on distributed optical fiber sensing technology - Google Patents
Linkage monitoring system based on distributed optical fiber sensing technology Download PDFInfo
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- CN106683309A CN106683309A CN201510756570.8A CN201510756570A CN106683309A CN 106683309 A CN106683309 A CN 106683309A CN 201510756570 A CN201510756570 A CN 201510756570A CN 106683309 A CN106683309 A CN 106683309A
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- China
- Prior art keywords
- video
- signal
- subsystem
- optical fiber
- distributed optical
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Classifications
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
Abstract
The invention relates to the distributed optical fiber sensing technology and particularly relates to a linkage monitoring system based on distributed optical fiber sensing technology. The system comprises a perimeter alert subsystem, a signal processing subsystem, and a video response subsystem. The perimeter alert subsystem is formed by a distributed optical fiber sensing network, a laser diode (LD) light source module, and an optical signal processing module. The signal processing subsystem is formed by a data acquisition card and signal analysis control software. The video response subsystem is formed by an alarm information analysis module, a video acquisition box, an integrated decoder cloud desk, a video streaming media server, and a video remote control network. According to the system, signal sensing and transmission are integrated into one body, the signal transmitted in a distributed optical fiber is analyzed, the alarm information is transmitted to the linkage monitoring system so as to control the video collection equipment, the functions are rich, and the performance is stable.
Description
Technical field
The present invention relates to Distributed Optical Fiber Sensing Techniques, more particularly to a kind of linkage surveillance system based on Distributed Optical Fiber Sensing Techniques
System.
Background technology
With the continuous development of science and technology, the species of monitoring device is also more and more.But existing monitoring device, exists on market
Various defects：Such as detect discontinuous, there is monitoring blind area；Equipment easily receives external environment condition (weather, electromagnetic interference) shadow
Ring, rate of false alarm is high；Investigative range is little, and security is low etc..In this case, a kind of complete function, stable performance are developed
Monitoring system, just seem necessary and important.
The safety monitoring product developed based on various technologies is to emerge in an endless stream, on market existing monitoring device be then broadly divided into
Under several classes：
(1) using the watch-dog of Infrared Detectors, the infrared ray sent by heat seeking Infrared Detectors detecting object is converted to and regarded
Frequency information shows in terminal.It can not affected in night monitoring by light.
(2) using microwave object mobile detector, using microwave equipment to mobile object (containing people) transmitting and the Doppler of reflection frequency difference
Effect, you can detect the invasion of people.
(3) ultrasonic object mobile detector：It is similar with microwave mobile detector, but wavelength has a difference, ultrasonic frequency 20KHz with
On.
(4) light formula mobile detector is detectd：Differential detection device is constituted using two photocells, the micro change of ambient light can be detected
Change.
(5) close-circuit television,closed-circuft televishon：It is monitored by camera acquisition vision signal.
But, these products but more or less have deficiency, such as video monitoring in performance, using fixed point monitoring, then monitor
Scope is little, using continuous scanning, then causes the wasting of resources, is additionally easily affected by installation environment, there is monitoring blind area；And for example
Infrared monitoring, light monitoring is detectd, be then easily subject to weather, the impact of the external environment condition such as external heat source, rate of false alarm is high；And for example microwave
Detection and ultrasonic listening, then easily made systemic breakdown by electromagnetic interference, and system complex, relatively costly.
Distributed Optical Fiber Sensing Techniques are applied to protection and monitor field by the present invention, are achieved that non-blind area is supervised merely with ordinary optic fibre
Control, this still belongs at home pioneering.Distribution type fiber-optic makees triggering warning device, can not only collect sensing and be transmitted in one,
And be difficult to be affected by the external environment.Meanwhile, system is based on the signal analysis control software designed by LabVIEW development platforms,
The signal transmitted in distribution type fiber-optic can be analyzed, while supporting data base querying, and warning message transmission can be linked
Tracking system is controlling video capture device, feature richness, stable performance.Additionally, the system is also by cooperative video monitoring technology
Among being dissolved into design, and it is different from traditional video surveillance fixed point observation or the continuous monitor mode for scanning, band laser night vision function
Video equipment Real Time Observation, tracking are only carried out to alarm region and are recorded a video, clear and intuitive monitored picture can not only be provided, also
System resource is set to have obtained effectively utilizes, this is also a big innovation in design concept.
The content of the invention
The problem to be solved in the present invention is to propose a kind of cooperative monitoring system based on Distributed Optical Fiber Sensing Techniques, based on signal
The design philosophy of analysis and Control technology, laser night vision technology and linkage surveillance, realizes that non-blind area is monitored using ordinary optic fibre.
To solve above-mentioned technical problem, the invention provides a kind of cooperative monitoring system based on Distributed Optical Fiber Sensing Techniques, bag
Include：Periphery warning subsystem, signal processing subsystem and video response subsystem.
(1) periphery guards against subsystem by distributing optical fiber sensing network, semiconductor laser (LD) light source module and fiber-optic signal
Processing module is constituted.
Monitor area is divided into multistage by the subsystem, separate between each section, possesses the fiber laser arrays link of oneself, these
Link constitutes distributing optical fiber sensing network.Narrow linewidth semiconductor laser (LD) sends pulsed optical signals and first main coupling of Jing
Device light splitting is to each section of sensor fibre, and each section of sensor fibre length is different, and so the fiber-optic signal of difference sections will produce different
Time delay；And each section of sensor fibre Duan Jun adopts Liriodendron chinese structure, i.e., by coupler, again light splitting is passed to isometric two
In photosensitive fine interfere arm, when sensor fibre interfere arm is transmitted, the ambient parameter such as stress, disturbance and vibrations changes pulsed optical signals
The phase place change of phase-modulation generation is carried out to optical signal, and is based on Liriodendron chinese principle, the light letter in two interfere arms
When number being coupled device once again coupled to same section of optical fiber, will interfere, such phase place change will be converted into light intensity change；This
Sample, each section with the different delay optical signal with heat transfer agent, will be according to time division multiplexing principle by another main coupler
Synthesize non-interfering one group of light pulse signal, then carry out after light-to-current inversion, being converted into electrical sensor signal concurrent by photo-detector
Deliver to capture card.
Phase modulation technique is directed to, described phase modulation technique is exactly placed in sensor fibre in environment to be measured, when receiving
When vibration, the vibrated signal function of sensor fibre causes fiber lengths, diameter and refractive index to change and produce phase of light wave
Change, phase of light wave change in measurement sensor fibre understands corresponding Oscillation Amplitude.Light wave is by the optical fiber that length is l, phase place
Delay is φ=β l, in formula β be propagation constant of the light wave in light, β=nk.Wherein n is fiber core refractive index, and k exists for light
Wave number in vacuum.When sensor fibre is acted on by mechanical force or thermal field, series of physical effect will be caused, make the parameter of optical fiber
Change.Longitudinal strain effect therein makes length l of optical fiber change (Δ l)；Laterally poisson effect changes the core diameter 2a of optical fiber
(Δ a), and then cause propagation constant β to change (Δ β)；Elasto-optical effect and thermo-optic effect change the fiber core refractive index n of optical fiber
(Δn).The change of the above-mentioned parameter of sensor fibre is all by the change of the phase of light wave caused in optical fiber.
Section 1 represents the phase difference (strain effect or heat expansion effect) that sensor fibre length change causes in formula, and Section 2 is sensing
The phase difference (elasto-optical effect or thermo-optic effect) that optical fibre refractivity change causes.Section 3 is the phase that the change of sensor fibre core diameter causes
Potential difference (poisson effect), due to its value it is comparatively small, it is general negligible.
Understand that pressure causes phase of light wave to become and turns to by contingency theory and buoyancy effect principle：
It can be seen that, phase place change is proportional to pressure P and action length L.
(2) signal processing subsystem is made up of data collecting card, signal analysis control software.
The Fibre Optical Sensor signal of data collecting card high speed acquisition periphery warning subsystem output, delivers to signal analysis software, and it is right to realize
The high speed effective process and good human-computer interaction interface of transducing signal.Event log data storehouse is set up simultaneously, supports to remember history
The inquiry of record.And to the database analysis model that transducing signal is set up, real-time tracking can be carried out to environmental information, understand environment
Noise jamming, improve system reliability and stability.The signal processing subsystem is analyzed rear display alarm to signal
Information, while warning message is delivered into the linkage information analysis module of video tracking subsystem.
(3) the video response subsystem is by warning message analysis module, video acquisition box, integrated decoder head, video flowing
Media server and Video Remote controlling network are constituted.The present invention has incorporated the advantage of video monitoring, sends by analysis software
Alarm signal is triggered, and is carried out in real time to being invaded region and carrying out the region of video monitoring, i.e. video monitoring subsystem only to producing warning
Video response.This intelligentized video response function, greatly improves the automaticity of system, also greatly improves
The utilization rate of system resource.
Description of the drawings
The specific embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings, wherein：
Fig. 1 is that the one-channel signal of the present invention extracts schematic diagram；
Fig. 2 is the signal analysis schematic diagram of the present invention；
Specific embodiment
As shown in figure 1, the present invention is multiplexed by means of the thought of the time-division multiplex technology in optical communication to light pulse.And it is right
One of key point of extraction of time sequential pulse optical signal is to find marking signal, due to the Amplitude Ration transducing signal of marking signal it is big
Many times, therefore amplitude detection is carried out to photosignal and debounce processing just can be with telltale mark signal.
After marking signal is found, it is necessary to transducing signal is carried out being accurately positioned and recovering signal.Per all the way pulse signal according to
Rely in fiber lengths, but during practice of construction, many inconveniences have been measured to the concrete length of optical fiber, therefore
Fiber lengths setting should not directly be carried out to system.Thus our signals in positioning directly to gathering are identified, calculate every
The position of transducing signal all the way.To pulse signal after positioning, then carry out transducing signal regeneration.
As shown in Fig. 2 due to the interference effect of external environment condition, the signal gathered by capture card can not completely characterize invader and produce
Raw signal, it is also possible to which can produce rub-out signal (optical signal as caused by due to temperature change acutely drifts about) causes system to be sentenced
Dislocation is missed.Thus be necessary to process the interference effect of environment, eliminate the impact to normal signal.Remember in analytical database
The recent amplitude of Lu Liaomei roads signal.In the monitoring to environment, by the statistical analysis to database, current environment is judged
Parameter, then suitably adjusts the alarm parameters of system, in the hope of the optimum decision threshold of the system under current state.
After eliminating the impact of environment, then analysis is made decisions to signal.Through Mach --- after Zehnder interferometer, due to phase place
Change be converted into the conversion of signal light intensity.From theoretical analysis and calculation, the signal after interference is the light intensity of an alternation
Signal.Analysis to light intensity signal is spectrum analysis first, due to different quality people or object pass through when phase place to optical signal
Modulating action is different, thus the result of modulation is different, can accurately adjudicate whether there is invader by this analysis, while also
The standard deviation of signal, peak-to-peak value etc. can be made decisions.And for the alarm signal having occurred and that, can also be by holding
The parameters such as continuous time are judging the type of event.
Embodiments of the present invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned embodiment,
According to present disclosure, some identical, replacement schemes that one of ordinary skill in the art can obviously expect,
The scope of protection of the invention all should be fallen into.
Claims (4)
1. a kind of cooperative monitoring system based on Distributed Optical Fiber Sensing Techniques, including：Periphery warning subsystem, signal transacting
System and video response subsystem, wherein：The periphery guards against subsystem by distributing optical fiber sensing network, semiconductor laser
(LD) light source module and fiber-optic signal processing module are constituted；The signal processing subsystem is by data collecting card, signal analysis
Control software is constituted；The video response subsystem by warning message analysis module, video acquisition box, integrated decoder head,
Video stream server and Video Remote controlling network are constituted.
2. the cooperative monitoring system of Distributed Optical Fiber Sensing Techniques is based on as claimed in claim 1, wherein：Described periphery police
Thimble system adopts phase modulation technique, and described phase modulation technique is that sensor fibre is placed in environment to be measured, when being shaken
When dynamic, the vibrated signal function of sensor fibre causes fiber lengths, diameter and refractive index to change and produces phase of light wave change,
Phase of light wave change in measurement sensor fibre understands corresponding Oscillation Amplitude.Light wave passes through optical fiber of the length for l, and phase delay is
φ=β l, in formula β be propagation constant of the light wave in light, β=nk.Wherein n be fiber core refractive index, k be light in a vacuum
Wave number.
3. the cooperative monitoring system of Distributed Optical Fiber Sensing Techniques is based on as claimed in claim 1, wherein：At described signal
In reason subsystem, the Fibre Optical Sensor signal of data collecting card high speed acquisition periphery warning subsystem output delivers to signal analysis software,
Event log data storehouse is set up, the inquiry to historical record is supported.
4. the cooperative monitoring system of Distributed Optical Fiber Sensing Techniques is based on as claimed in claim 1, wherein：Described video rings
In answering subsystem, the advantage of video monitoring is incorporated, the alarm signal triggering sent by analysis software is carried out to being invaded region
Video monitoring, video monitoring subsystem only carries out real-time video response to producing the region reported to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510756570.8A CN106683309A (en) | 2015-11-10 | 2015-11-10 | Linkage monitoring system based on distributed optical fiber sensing technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510756570.8A CN106683309A (en) | 2015-11-10 | 2015-11-10 | Linkage monitoring system based on distributed optical fiber sensing technology |
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| CN106683309A true CN106683309A (en) | 2017-05-17 |
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| CN201510756570.8A Pending CN106683309A (en) | 2015-11-10 | 2015-11-10 | Linkage monitoring system based on distributed optical fiber sensing technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115035667A (en) * | 2022-05-13 | 2022-09-09 | 南京邮电大学 | Photon fence system for optical fiber mode division multiplexing real-time video transmission |
-
2015
- 2015-11-10 CN CN201510756570.8A patent/CN106683309A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115035667A (en) * | 2022-05-13 | 2022-09-09 | 南京邮电大学 | Photon fence system for optical fiber mode division multiplexing real-time video transmission |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170517 |
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| WD01 | Invention patent application deemed withdrawn after publication |