CN202904787U - Optical fiber perimeter security system based on intermodal interference principle - Google Patents
Optical fiber perimeter security system based on intermodal interference principle Download PDFInfo
- Publication number
- CN202904787U CN202904787U CN 201220351128 CN201220351128U CN202904787U CN 202904787 U CN202904787 U CN 202904787U CN 201220351128 CN201220351128 CN 201220351128 CN 201220351128 U CN201220351128 U CN 201220351128U CN 202904787 U CN202904787 U CN 202904787U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- control unit
- optical cable
- system based
- interference principle
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to an optical fiber perimeter security system based on intermodal interference principle, which is applied to important facility area security. The optical fiber perimeter security system consists of a vibration sensing cable (1), a guide cable (3), a central control unit (4) and a system host (5); wherein the central control unit (4) and the system host (5) are placed in the monitoring center; the important facility area is divided into several security areas, two ends of the vibration sensing cable (1) laid around each security area are respectively connected with the central control unit (4) by the double-core single-mode guide cable (3), fused fiber splicing boxes (2) are respectively mounted on the head end (6) and the tail end (7) of the security area and respectively connected with an optical source output port (8) and an optical signal receive port (9) by the double-core single-mode guide cable (3); the output of the central control unit (4) is connected with the system host (5). The optical fiber perimeter security system has features of high alarm accuracy, low false alarm rate, lightning protection, explosion protection, good environment adaptability, and being not affected by rain, fog and smoke.
Description
Technical field
The utility model is a kind of optical fiber perimeter safety-protection system based on the intermode interference principle that the critical facility region securities such as military establishment, government department, airport, oil depot, bank, museum are taken precautions against that is applied to, and relates to the measurement of mechanical vibration, the measurement of impact, system and the piping system technical field of optics.
Background technology
The circumference security and guard technology has been usually used to protect military installations and government organs since coming out, early stage technology does not enter the commercial market owing to expensive.Along with the develop rapidly of electronic information technology and computer technology, the circumference security precautions technology has also had the development of advancing by leaps and bounds, and at present commercial is wider infrared emission, digital microwave, vibration wireline, vibration optical cable, intelligent video etc.For less protection object, using more is the cheaper technology of price such as infrared emission technology, laser-correlation, and the requirement of technology is also proofreaded.For large-scale strick precaution object, these technology are reported the problems such as many by mistake because the problem of technology itself all exists environmental suitability poor, and these technology also are subject to enclosing the restriction of boundary's shape in addition, can't use for irregular zone.In addition, in inflammable and explosive environment places such as Oil and gas station, arsenals, these technology can't be used especially.
The vibration optical cable technology, because advantage that optical fiber intrinsic safety, transmission range are long, cheap etc., the vibration optical cable technology is widely used the perimeter protection in large areas such as airport, nuclear power stations, also is widely applied to these classes such as protection oil depot, arsenal to the demanding place of explosive-proof grade.Current, domestic optical fiber perimeter security and guard technology commonly used all is based on the system of the fiber optic interferometric formation of Mach-Zender interference mostly.Chinese granted patent ZL.200410020046.6 for example.This technology can realize the location of intrusion event, and positioning principle is to utilize the light propagated along anti-both direction to position by the mistiming of same position.But because the velocity of propagation of light is up to 2.0 * 108m/s in the optical fiber, so bearing accuracy and employing rate have direct relation.For example adopt the 10M sampling, the theoretical bearing accuracy of conversion adopts 1M sampling bearing accuracy to be 200 meters greater than 20 meters.In actual applications, because the method problem of both direction mistiming calculating, its positioning error will be much larger than actual value.Adding the impact that is subject to polarization decay, can cause the unstable of system testing performance, affair alarm and identification are brought very large difficulty.So system in actual applications, and the actual location repeatability that obtains is very poor, the thousands of meters scope bias internals of being everlasting.The optical cable of tens of kms is a sensor in this technology simultaneously, the disturbance of regional acts on simultaneously, can't carry out the multiple affair location, interferes with each other with regard to the signal that has caused each defence area like this, can't with ground unrest and invasion signal distinguishing, cause the mistake of system under pervasive noise conditions quick.
For existing issue, the present invention proposes a kind of defence area formula multimode optical fiber circumference security and guard technology based on the intermode interference principle, this technical costs is cheap, can be widely used in the safety precaution of the long-distance line shape structures such as region security strick precaution and oil and gas pipes, railway, highway.
The utility model content
The purpose of this utility model be penetrate 6 one kinds the system alarm accuracy rate be high, rate of false alarm is low, lightning protection, explosion-proof, good environmental adaptability, optical fiber perimeter safety protection method and the system based on the intermode interference principle that not affected by misty rain and flue dust.
The utility model by signature analysis is carried out in the variation of intermode interference mould spot, is realized the accurate identification of vibration event based on the defence area formula optical fiber perimeter security and guard technology of intermode interference principle; Arrange by minute defence area to optical fiber, realize the segmentation of invading to external world the locus; By the pattern of " guiding optical cable+sensing optic cable+guiding optical cable ", realize full optical fiber protection laying, need not lightning protection, be particularly useful for the use in the place such as inflammable and explosive.Simultaneity factor goes for the perimeter protection of various shapes, has overcome the problem that other technologies can't be used irregular area.
This optical fiber perimeter safety-protection system is based on the intermode interference principle of multimode optical fiber, utilize multimode optical fiber to consist of vibrative sensor, be laid on the enclosure wall in critical facility zone or subsurface, when having the invader to cross the critical facility zone, system can detect the vibration signal that the invader produces, the (see figure 1) of reporting to the police immediately.
Based on the formation of the optical fiber perimeter safety-protection system of intermode interference principle as shown in Figure 2.Native system is comprised of vibrating sensing optical cable 1, guiding optical cable 3, centralized control unit 4 and system host 5 parts.Wherein centralized control unit 4 and system host 5 are placed in the Surveillance center.The critical facility zone is divided into a plurality of defence areas, and vibrating sensing optical cable 1 two ends that the circumference in each defence area lays are connected with centralized control unit 4 by twin-core single mode guiding optical cable 3 respectively, the terminal 7 installing optical fibres splicing boxs 2 in first section 6 in defence area and defence area; Connect respectively twin-core single mode guiding optical cable 3 and connect light source output 8 and light signal reception 9.The output welding system main frame 5 of centralized control unit 4.
When having personnel to invade from the climbing of enclosure wall top, the invader has touched vibrating sensing optical cable 1, cause the vibration of optical cable, optical fiber is produced ess-strain, thereby the transport property (as: polarization of light wave, scattering and phase place) that has influence on light wave in the optical fiber changes, and can detect the external vibration signal by the variation that detects lightwave transmission characteristics.Vibration signal is transferred to centralized control unit 4 by guiding optical cable 3 and analyzes and process, and judges whether it is the intrusion event.If judge it is the intrusion event, warning message is passed to the system host 5 of pulpit, and sends alerting signal, light the sound and light alarm signal lamp, the operator on duty can in time be checked and stop the external staff to invade, for the defence area provides strong safety guarantee.
Described centralized control unit 4 forms (see figure 3) by a plurality of warning processing units, and the corresponding defence area of each warning processing unit is connected with the front end sensing optic cable by the guiding optical cable;
The composition of described warning processing unit as shown in Figure 4; Mainly comprise: coherent laser light source, light source driver module, photodetection module, signal condition module, microprocessor, communication module; Light source driver module connects the coherent laser light source, the coherent laser light source connects the guiding optical cable, laser signal is coupled into vibrating sensing optical cable 1, the defence area end 7 of vibrating sensing optical cable 1 is behind Fiber splice tray 2, connect the photodetection module by guiding optical cable 3, be connected in series successively signal condition module, microprocessor, communication module after the photodetection module;
Wherein:
1) coherent laser light source adopts the DFB(distributed feedback) laser diode provides light source for the multimode sensor fibre, and its wavelength is 1550nm, and power is 1mW; The advantages such as the semiconductor laser diode luminous power is large, monochromaticity and good directionality, this light source stability is high, adapts to by force, satisfies on-the-spot various service condition, has higher reliability;
2) photodetection module mainly is comprised of photodiode, prime amplifier; The photodetection module mainly is comprised of photodiode, prime amplifier; The front end of photodetection module is photodiode, connects prime amplifier behind the photodiode; Light signal incides through coupling mechanism on the photosurface of photodiode, and photodiode is converted into time dependent electric signal with light intensity signal; The effect of prime amplifier is that the circuit that this electric signal amplifies for the back is carried out the signal processing;
4) signal condition module, noise contribution contained in the detection signal is very large, and useful detection signal level is very low, is often covered by a large amount of noises; Therefore need to adopt the signal condition module that detection signal is processed, thereby effectively extract useful signal, reduce noise to the impact of useful signal;
5) microprocessor adopts the acquisition and processing function of DSP micro-chip processor settling signal, tentatively finishes the judgement of vibration signal, and the vibration alarming signal is transferred to central control unit by optical fiber communication modules, is further analyzed and judges;
6) communication module adopts the XML communication mode to finish the data-transformation facility of alarm unit and central control unit.
System's electrical schematic diagram as shown in Figure 5.The Fiber splice tray that the FC output terminal of centralized control unit is taken over control the district by the guiding optical cable, Fiber splice tray connects sensing optic cable, after the other end of sensing optic cable also connects a Fiber splice tray, is connect the FC input end of centralized control unit by the guiding optical cable; The LAN port of centralized control unit connects the LAN port of industrial computer, and the VGA port of industrial computer connects the VGA port of display.
Effect of the present utility model:
The utility model adopts full optic cable design, has realized the full optical fiber laying of anti-area circumference, need not lightning protection, ground connection, has further strengthened on the whole the intrinsic safety of system, is specially adapted to use in the inflammable and explosive environment.By adopting the mode in defence area, effectively the disturbance location is limited in the defence area.The utility model carries out sensing based on the multimode optical fiber mode simultaneously, realized the safety precaution in defence area by a multimode optical cable, by single mode guiding optical cable all defence areas are connected with centralized control unit, realized critical facility circumference full protection, signal transmission and sensing are all undertaken by optical fiber, need not extra power supply, wiring is convenient, and having solved traditional perimeter protection equipment need to be with ditch communication and electric power system problem.Compare with the anti-invasion technology of traditional vibration wireline, this technology is installed simple, and maintenance workload is little.Compare with various correlation modes, the method good environmental adaptability is not subjected to the impact of misty rain and flue dust.
Description of drawings
Fig. 1 forms schematic diagram based on the optical fiber perimeter safety-protection system of intermode interference principle
Fig. 2 is based on the optical fiber perimeter safety-protection system defence area distribution schematic diagram of intermode interference principle
Fig. 3 alarm processor and vibrating sensing optical cable connection diagram
Fig. 4 on-site detecting unit hardware forms schematic diagram
Fig. 5 system circuit diagram
1-vibrating sensing optical cable, 2-Fiber splice tray wherein
3-guiding optical cable, 4-centralized control unit
5-system host, 6-defence area head end
7-defence area end 8-light source output port
9-light signal receiving port
Embodiment. this example is an experimental prototype.System prototype is applied to protect the oil depot of circumference 1.7km.Anti-in actual use pad circle is divided into 8 defence areas, about each defence area 200m, and defence area distribution schematic diagram such as Fig. 2.The vibrating sensing optical cable 1 in each defence area is connected to centralized control unit 4 by single mode guiding optical cable 3.System adopts narrow linewidth coherent laser light source, the light that laser instrument sends enters guiding optical cable 3 from light source output port 8, enter again vibrating sensing optical cable 1, passed at last back the light signal receiving port 9 of detector by guiding optical cable 3, detect vibration signal through the photodetection module, by passing to microprocessor analysis after the signal condition resume module, analysis result has communication module to be sent to system host to carry out analysis-by-synthesis.
When the external world had intrusion behavior to occur, the fiber phase of propagating in the vibrating sensing optical fiber 1 in the defence area changed.The photodetection module can detect this signal, and signal is transferred to main frame after advancing to process, and system host determines whether intrusion event by the identification and analysis of signal, when being judged as intrusion event, and system alarm.
Wherein, optical fiber provides by four seas company, and sensor fibre is multimode optical fiber, core diameter 62.5um, and covering 125um, guiding optical fiber is single-mode fiber, core diameter 5um, covering 125um; Light source adopts distributed feedback type semiconductor laser (PFB-LD), and operation wavelength is 1550nm; What detector was selected is that Wuhan Telecommunication Devices Co., Ltd's model is the communication PIN detector single tube of PDDM981, is characterized in that response speed is high, and conversion efficiency is high, and with the single-mode fiber tail optical fiber, the convenient connection; What splicing box was selected is that middle day scientific and technological model is the fiber optic closure of GLK-24 type.
This example owing to adopting full optic cable design, has realized circumference full optical fiber laying in anti-area through test, need not lightning protection, ground connection, has strengthened Security of the system.By adopting the mode in defence area, effectively the disturbance location is limited in the defence area.Need not extra power supply, wiring is convenient, and having solved traditional perimeter protection equipment need to be with ditch communication and electric power system problem.Simultaneously, install simply, maintenance workload is little, and good environmental adaptability is not subjected to the impact of misty rain and flue dust.
Claims (8)
1. the optical fiber perimeter safety-protection system based on the intermode interference principle is characterized in that it is comprised of vibrating sensing optical cable (1), guiding optical cable (3), centralized control unit (4) and system host (5) part; Wherein centralized control unit (4) and system host (5) are placed in the Surveillance center; The critical facility zone is divided into a plurality of defence areas, vibrating sensing optical cable (1) two ends that the circumference in each defence area lays are connected with centralized control unit (4) by twin-core single mode guiding optical cable (3) respectively, terminal (7) the installing optical fibres splicing box (2) in defence area head end (6) and defence area connects light source output (8) and light signal reception (9) through twin-core single mode guiding optical cable (3) respectively; The output welding system main frame (5) of centralized control unit (4).
2. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 1, it is characterized in that described centralized control unit (4) is comprised of a plurality of warning processing units, the corresponding defence area of each warning processing unit is connected with the front end sensing optic cable by the guiding optical cable.
3. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 1, it is characterized in that the FC output terminal of centralized control unit is by the Fiber splice tray that guides optical cable to take over control the district, this Fiber splice tray is connect the FC input end of centralized control unit by the guiding optical cable after sensing optic cable connects a Fiber splice tray again; The LAN port of centralized control unit connects the LAN port of industrial computer, and the VGA port of industrial computer connects the VGA port of display.
4. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 2 is characterized in that described warning processing unit mainly comprises: coherent laser light source, light source driver module, photodetection module, signal condition module, microprocessor, communication module; Light source driver module connects the coherent laser light source, the coherent laser light source connects the guiding optical cable, laser signal is coupled into vibrating sensing optical cable (1), vibrating sensing optical cable (1) in the defence area terminal (7) behind Fiber splice tray (2), connect the photodetection module by guiding optical cable (3), be connected in series successively signal condition module, microprocessor, communication module after the photodetection module.
5. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 3 is characterized in that described coherent laser light source adopts DFB distributed feedback laser diode, and its wavelength is 1550nm, and power is 1mW.
6. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 3 is characterized in that described photodetection module mainly is comprised of photodiode, prime amplifier; The front end of photodetection module is photodiode, connects prime amplifier behind the photodiode; Light signal incides through coupling mechanism on the photosurface of photodiode, and photodiode is converted into time dependent electric signal with light intensity signal.
7. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 3 is characterized in that described microprocessor adopts the DSP micro-chip processor.
8. a kind of optical fiber perimeter safety-protection system based on the intermode interference principle according to claim 3 is characterized in that described communication module adopts the XML communication mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220351128 CN202904787U (en) | 2012-07-19 | 2012-07-19 | Optical fiber perimeter security system based on intermodal interference principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220351128 CN202904787U (en) | 2012-07-19 | 2012-07-19 | Optical fiber perimeter security system based on intermodal interference principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202904787U true CN202904787U (en) | 2013-04-24 |
Family
ID=48125427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220351128 Expired - Lifetime CN202904787U (en) | 2012-07-19 | 2012-07-19 | Optical fiber perimeter security system based on intermodal interference principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202904787U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104960549A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Protective unattended system capable of sensing railway field operation on the basis of thin-core optical fiber |
| CN104960550A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Unmanned watching system for railway on-site operation protection based on double-core optical fiber interferometer |
| CN105869327A (en) * | 2016-04-20 | 2016-08-17 | 宁波绿阳智汇电气科技有限公司 | Optical fiber vibration detection system and invasion 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 |
| CN108734907A (en) * | 2018-08-23 | 2018-11-02 | 中山光蓝信息技术有限公司 | A kind of Along Railway safeguard alarm system and alarm method based on Fibre Optical Sensor |
| CN108765814A (en) * | 2018-08-23 | 2018-11-06 | 中山光蓝信息技术有限公司 | Boundary line periphery intrusion preventing alarm system based on Fibre Optical Sensor and method |
-
2012
- 2012-07-19 CN CN 201220351128 patent/CN202904787U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104960549A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Protective unattended system capable of sensing railway field operation on the basis of thin-core optical fiber |
| CN104960550A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Unmanned watching system for railway on-site operation protection based on double-core optical fiber interferometer |
| CN105869327A (en) * | 2016-04-20 | 2016-08-17 | 宁波绿阳智汇电气科技有限公司 | Optical fiber vibration detection system and invasion 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 |
| CN108734907A (en) * | 2018-08-23 | 2018-11-02 | 中山光蓝信息技术有限公司 | A kind of Along Railway safeguard alarm system and alarm method based on Fibre Optical Sensor |
| CN108765814A (en) * | 2018-08-23 | 2018-11-06 | 中山光蓝信息技术有限公司 | Boundary line periphery intrusion preventing alarm system based on Fibre Optical Sensor and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202904787U (en) | Optical fiber perimeter security system based on intermodal interference principle | |
| RU2226270C2 (en) | Device and method controlling structure with use of signals propagating in mutually antithetical directions to establish localization of disturbances | |
| CN104565826B (en) | Pipeline optical fiber safety monitoring and pre-warning method and system | |
| CN103048588B (en) | Method and system for on-line locating power cable fault | |
| US11035720B2 (en) | Warning device for preventing underground cables against accidental excavation | |
| CN203940239U (en) | Pipeline optical fiber safety monitor and early warning system | |
| CN201413557Y (en) | Optical path multiplexing system of regional anti-intrusion system based on fiber optic interferometers | |
| CN109541715B (en) | Railway foreign matter invasion safety sensing and identifying system based on distributed optical fiber sensing | |
| CN104574742A (en) | Optical fiber circumference security and protection system based on phi-OTDR technology | |
| CN105371942A (en) | Distributed optical-fiber coal mine rescue positioning system | |
| CN105114817A (en) | Oil-gas pipeline monitoring system based on optical fiber | |
| CN101956567B (en) | Intrinsic safety all-fiber underground monitoring system | |
| US11422042B2 (en) | Fiber optic temperature sensors in a distributed smoke detection system | |
| CN105134293A (en) | Subway tunnel safety monitoring system and method based on optical fiber sensing | |
| CN101701844B (en) | Optical fiber vibration sensing system and using method thereof based on double Mach-Zehnder interferometers | |
| CN102692269A (en) | Positioning method and system of Sagnac fiber distributed vibrating sensor | |
| GB2558295A (en) | A distributed lightning stroke detection system operating in a monitoring mode | |
| CN202600875U (en) | Defence-area optical fiber perimeter protection pre-warning system | |
| JP2001134851A (en) | Invasion monitor sensor utilizing optical fiber cable | |
| CN202916936U (en) | Video monitoring optical fiber fence system | |
| CN102562158A (en) | Intrinsically-safe distributed all-fiber downhole monitoring system | |
| CN201963358U (en) | Intrinsically safe distributed allfiber underground monitoring instrument | |
| CN105022096A (en) | Perimeter monitoring method based on optical fiber interference | |
| CN204348003U (en) | Optic cable vibration is descended to detect source of early warning in a distributed manner | |
| CN205154255U (en) | Subway tunnel safety monitoring system based on optical fiber sensing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211116 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 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |