CN101901530B - Fiber interferometer-based region anti-intrusion light path system - Google Patents
Fiber interferometer-based region anti-intrusion light path system Download PDFInfo
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- CN101901530B CN101901530B CN200910203251.9A CN200910203251A CN101901530B CN 101901530 B CN101901530 B CN 101901530B CN 200910203251 A CN200910203251 A CN 200910203251A CN 101901530 B CN101901530 B CN 101901530B
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Abstract
The invention discloses a fiber interferometer-based region anti-intrusion light path system and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline system. The light path system comprises a transmission light path I (16), a transmission light path II (18), a light path adapter (17) and a sensing light path (20). The sensing light path (20) consists of fiber interferometers in each defense region. A light source module (15) is connected with the light path adapter (17) through the transmission light path I (16); the light path adapter (17) outputs a defense line of each defense region which is connected with the sensing light path (20) through the transmission light path II (18); the sensing light path encloses a protection region by a circle and is connected back to the light path adapter (17) through the transmission light path II (18); the light path adapter (17) is connected with an optical input end of a detector array (21) through the transmission light path (16); and an output end of the detector array (21) is connected with a signal processor (22).
Description
Technical field
The present invention is a kind of region anti-intrusion light path system based on fibre optic interferometer, relates to the measurement of mechanical vibration, the measurement and the piping system technical field of impact.
Background technology
The safety precaution in zone all is an important problem all the time, and is such as military base, airport, armory, oil depot, oil and gas pipes station and residential quarters etc., most important to effective protection in these zones.
At present main regional intrusion defense technology have based on electricity and based on two big types of light;
Technology based on electricity mainly contains high-voltage fence technology, leaky cable technology etc.On some important area border, be provided with high-voltage fence, can form deterrence to the invador to a certain extent, but there is poor stability in high-voltage fence, does not possess the interlink warning function; When using the leaky cable of radiation field to carry out intrusion detection, receive forceful electric power magnetic environment such as thunder and lightning easily and disturb and the wrong report of increase system.
Technology based on light mainly contains intrusion detection technology of infrared ray correlation alarm technique, camera surveillance technology, imaging fiber intrusion detection technology and Fibre Optical Sensor etc.Wherein infrared correlation alarm technique mid-infrared laser bundle is difficult to accurately aim at the small target center of light-receiving device; Especially when rainy day and haze weather; Can make the laser beam direction of propagation produce deviation because of the refraction of rainwater, haze; Will report to the police by initiating system when stopping the correlation approach if any barriers such as fallen leaves, toys during sunny weather, and make the invador very easily get around the correlation path, cause the alarm inefficacy because of not possessing certain disguise; Requirement to laying mode is also higher, generally is only applicable to short-range flat site.
The camera surveillance technology is the more a kind of intrusion detection pattern that adopts at present, camera keep watch on since have the narrower visual field particularly in the camera rear flank blind area of face usually climbed up and over, and camera is kept watch on and is also usually received the influence of weather and lost efficacy.Imaging fiber intrusion detection technology be based on light wave in multimode optical fiber because the interference between the different transmission mode forms speckle, and speckle image changes with external disturbance, this mode receives environmental impact easily and forms wrong report.
The intrusion detection technology of Fibre Optical Sensor has the microbending loss of measuring optical fiber, and this method sensitivity is low, be not suitable for the detection of dynamic event.
Also some is based on and interfere detects principle in the intrusion detection technology of Fibre Optical Sensor, as, " the optical-fiber security early-warning device " of China National Petroleum Corporation (CNPC) and China Petroleum Pipeline Bureau be utility model patent (ZL200620124262.X).At present, the light path system in the interference technique scheme is single interferometer and single defence line, and these schemes receive environmental impact equally easily, thinks some false invasion signals that environment causes invasion by mistake and produces false-alarm.
Summary of the invention
The objective of the invention is to invent a kind of little, region anti-intrusion system light path system that false alarm rate is low affected by environment based on fibre optic interferometer.
The false alarm rate that exists in view of above-mentioned several types of security and guard technologies is high, be subject to problem such as such environmental effects, combines time, the space characteristics of disturbance event to overcome targetedly based on the region anti-intrusion system of fiber optic interferometric technology.
The improvement that improves the region anti-intrusion system of optical fiber vibration sensing sensitivity mainly is the laying through light path system, improves the induction sensitivity of interferometer to vibration signal.
Formation based on to the region anti-intrusion light path system of the fibre optic interferometer of vibration sensing is shown in figure 14, comprising: delivery optics I 16, delivery optics II 18, light path adapter 17 and sensing light path 20; Sensing light path 20 is made up of the fibre optic interferometer in each defence area.
Light source 15 connects light path adapter 17 by delivery optics I 16; 17 outputs of light path adapter are connected the defence line in each defence area of sensing light path 20 by delivery optics II 18; The sensing light path takes back light path adapter 17 through delivery optics II 18 around the protection zone after one week once more; Light path adapter 17 connects detector array 21 light input ends by delivery optics 16, detector array 21 output termination signal processors 22.
Wherein:
Light source 15 provides the optical carrier of a steady power to interferometer light path;
Detector array 21, the opto-electronic conversion of realization back light signal;
Delivery optics I 16, delivery optics II 18 constitute by one or more Transmission Fibers, accomplish the transmission of light signal;
Light path adapter 17 is accomplished the beam splitting and the coupling of light signal;
Sensing light path 20, i.e. picking up and sending of vibration signal accomplished in the combination of each defence area fibre optic interferometer of protection zone.
The light that the light source 15 of system sends arrives light path adapter 17 through delivery optics I 16, through being divided into the n road after 17 beam splitting of light path adapter, corresponds respectively to n defence area; With defence area I is example; Light after the beam splitting is through how much once more the carry out beam splitting of delivery optics II 18 backs according to defence line quantity in the I of defence area; Get into per pass defence line in the I of defence area then, the sensing light path is designed to fibre optic interferometer in the I of defence area, and light signal is passed back after through defence area I inner fiber interferometer; Be flashlight in the I of defence area at subsequently defence area II, III so that defence area n is transmission; Rather than get into fibre optic interferometer once more, and once more get into adapter 17 through delivery optics II 18 around the protection zone after one week, be transferred to detector array 21 through delivery optics I 16 then; Convert into through detector array 21 and to be transferred to signal processor 22 behind the electric signal and to handle, whether decision sends a signal to alarm unit and produces and report to the police according to result.
The formation of fibre optic interferometer is: in the periphery of protection zone a plurality of defence areas are set; Each defence area is provided with more than one fibre optic interferometer; Fibre optic interferometer between the defence area is connected by the light path adapter; The fibre optic interferometer of head end connects from light path adapter 17, and terminal fibre optic interferometer takes back light path adapter 17 again.
Fibre optic interferometer wherein is the mixing use-pattern or the plug lattice nanogram interferometer of Michelson interferometer or Mach-Zehnder interferometer or Michelson interferometer and Mach-Zehnder interferometer;
The concrete structure of fibre optic interferometer is:
The structure of each fibre optic interferometer in each defence area: in each defence area, the sub-cable of sensing can be the responsive structure (see figure 1) of full section when multipath interference appearance light path was laid, and from female cable 1, told fibre optic interferometer 2, then got into female cable 1 and was passed back by Transmission Fibers 3; Also can be through beginning to be provided with interferometer again after the certain distance transmission in the sub-cable of transmission; Can one fibre optic interferometer be arranged in the female cable of transmission when the multiple tracks fibre optic interferometer is laid, from female cable 1, tell fibre optic interferometer 2, then get into female cable 1 and pass (see figure 2) back through Transmission Fibers 3; Also can the per pass defence line all corresponding to a sub-cable of sensing; From female cable 1, tell fibre optic interferometer 2 and be provided with, then get into female cable 1 and pass back through Transmission Fibers 3; The structure of each fibre optic interferometer is that the pickup arm I 4 of fibre optic interferometer, the pickup arm II 5 of fibre optic interferometer are arranged in the identical or different beam tube in the optical cable; Or the pickup arm I 4 of fibre optic interferometer, the pickup arm II 5 of fibre optic interferometer be arranged in the different optical cables; The optical cable that these two pickup arms belong to is respectively spatially perhaps separated for adjacent or intersection; Adjacent is form (see figure 4) or twisted-pair feeder form (see figure 5) side by side; Intersection is that two optical cables interweave and constitute the version (see figure 6) of fishing net shape; Separate and be meant that two optical cables are parallel and install, have spaced mounting means (see figure 7) between two optical cables;
The light channel structure of each fibre optic interferometer: be that linear pattern or arc line type are installed, or S type curve is installed perhaps spiral line type curve installation, the mixed form of several kinds of perhaps above-mentioned situation;
Wherein:
Linear pattern and arc line type are installed and are meant that fibre optic interferometer is arranged to straight line or camber line according to the zone boundary characteristic;
S type curve (see figure 8) is meant that fibre optic interferometer is according to the form installation around S type curve;
Spiral line type curve (see figure 9) is meant a kind of mode that fibre optic interferometer is installed along the spiral line type curve, and this helix is plane curve or space multistory curve;
Wherein S type and spiral line type curve are installed and are received the pickup arm length of vibration effect longer, and the phase differential of generation is also bigger, therefore also have higher vibration detecting sensitivity;
The structure of multiple defence line is: on the depth direction of border, the multiple tracks fibre optic interferometer is set respectively; The multiple tracks fibre optic interferometer is separately positioned on the both sides and border on border; Be arranged in the inboard on border subsurface or directly exposed on the ground, in the arranged outside on border at subsurface; On the border, looking type and the characteristic on border and decide, is fence like the border, then lays and fixing along the cross band plate of fence; Like the border is entanglement, then is fixed on the entanglement subsurface below the entanglement both sides then are embedded in entanglement; When forming by enclosure wall, on the inside and outside both sides and enclosure wall body of wall of enclosure wall, be provided with respectively together or the multiple tracks fibre optic interferometer like the border; Wherein the inside and outside light path of enclosure wall is embedded in subsurface or directly exposes on the ground; Fibre optic interferometer on the body of wall is to be embedded in the body of wall in the body of wall cutting, or when the building wall, is embedded in the body of wall, or adopts the ply-yarn drill nail directly to follow closely at surface of wall; Or adopt the mode of tying up that fibre optic interferometer is banded on the entanglement, or mix and adopt above-mentioned several kinds of fixed sturctures.
For reducing the normal system's false-alarm of coming in and going out and causing in regional gateway; The one's respective area anti-intrusion system adopts regional gateway is disposed the defence area separately; And be equipped with the telepilot (see figure 10) for the normal authorized person who comes in and goes out; Or be equipped with cipher switch (seeing Figure 11), the intrusion alarm function in defence area, temporary close gateway when making things convenient for the authorized person to come in and go out the protection zone in the gateway; Being equipped with teleswitch is on every fan door limit at gate, to enclose fibre optic interferometer 11 backs to connect region anti-intrusion system 8 by optical cable 10, connects remote control signal receiver 7 by region anti-intrusion system 8 through signal wire 9 again, is equipped with telepilot 6 again; Cipher switch is after enclosing fibre optic interferometer on every fan door limit at gate, to connect region anti-intrusion system 8 by optical cable, connects cipher inputting keyboard 13 by region anti-intrusion system 8 through signal wire again.For the former, on the area anti-intrusion main process equipment, connect remote control signal receiver 7, receive the warning function of closing or open the defence area, gateway behind the remote controller signal; For the latter, cipher inputting keyboard 13 to be installed in the gateway, and to be connected to region anti-intrusion system 8 with signal wire, the input password can temporarily be removed the warning function in defence area, gateway, and the authorized person recovers to put into the warning function of the system of invading through the back.
For effectively saving the fibre core resource, when adopting single wavelength light source, the light signal in different defence areas, defence line is aliasing each other, and therefore required fibre core quantity can be bigger when defence area quantity is big.In order to overcome this problem, the one's respective area anti-intrusion system proposes the structure of two kinds of multiplexing fibre cores:
First kind is that the flashlight of each fibre optic interferometer in each defence area share an Optical Fiber Transmission before arriving this defence area; Shown in figure 12; The structure of its multiplexing fibre core is: light source module meets adapter I by optical fiber, and adapter I output connects a corresponding defence area quantity adapter again, and each adapter connects two fibre optic interferometers in this defence area respectively; Fibre optic interferometer I, fibre optic interferometer II like defence area I; The fibre optic interferometer III of defence area II, fibre optic interferometer IV etc., the output of these fibre optic interferometers connects cable splice closure in the lump, is connected to detector array by optical cable more at last;
The light that light source module sends is multi-beam by adapter I beam splitting during with an Optical Fiber Transmission to first defence area, and quantity is identical with the defence area number; When each bundle light arrives corresponding defence area, by adapter again beam splitting get into each fibre optic interferometer in this defence area respectively for multi-beam with the defence line equal number.This scheme has been carried out the multiplexing of light path, fibre core quantity capable of reducing using at the light source output terminal and before arriving each defence area.
The second way is for adopting the structure of wavelength multiplexing; Shown in figure 13; The structure of its multiplexing fibre core is: light source module connects the adapter of receiving each defence area after the comb filter again, and two fibre optic interferometers of the adapter tap in each defence area are like fibre optic interferometer I, the fibre optic interferometer II of defence area I; The fibre optic interferometer III of defence area II, fibre optic interferometer IV etc.; The fibre optic interferometer in each identical defence line, defence area connects adapter and is coupled into same optical fiber, connects cable splice closure, is connected to detector array by optical cable more at last;
Wide spectrum light source is through being divided into the multi-beam of different wave length after the comb filter; Quantity is identical with the defence area number; Each Shu Guangjing optical fiber passes to corresponding defence area; Through adapter be divided into this defence area in the identical light beam of defence line quantity, get into the fibre optic interferometer in each defence line respectively, the interference signal of output is terminal through Optical Fiber Transmission to last defence area; The interference signal in different defence areas, same defence line closes bundle by adapter here, is transferred back to by an optical fiber and separates wavelength division multiplexer.This mode can reduce optical fiber and optical cable use amount significantly, reduces light path installation difficulty and cost.
Above-mentioned by the light of wide spectrum light source through the multi beam different wave length of comb filter acquisition, also can use the narrow linewidth light source of a plurality of different wave lengths to obtain.
Therefore: big or small according to the protection zone with different to the accuracy requirement of intrusion alarm positional information; The zone boundary that region anti-intrusion light path system will be protected is subdivided into minimum one or more defence area; In each defence area, all carry out the laying of fibre optic interferometer according to above-mentioned light path set-up mode; System produces the state of alert when fibre optic interferometer detects doubtful invasion signal; And set state of alert perdurability of certain-length in time, produce when comprehensive characteristics in alert time, occurring and meeting the intrusion behavior characteristic and report to the police.The intrusion behavior to the protection zone can be effectively judged in the comprehensive judgement in this binding time and space; Reduction system false alarm rate; In addition the geographic position that can accurately draw the invasion generation area is segmented on the border of protection zone, be easy to realize interlock with other system.
The anti-environmental disturbances ability of this system is strong, has tangible performance advantage and application prospects.Region anti-intrusion light path system is realized the intrusion event detection based on the sensing to vibration; Because geological condition is complicated and changeable; Verify differently the vibration attenuation by absorption widely different; For the adaptability of increase system to different geologic conditions, this light path system has proposed the structure of a kind of different spaces apart from two pickup arms of interval laying optical fiber interferometer, and this structure can form different vibration signal detection sensitivitys; Fibre optic interferometer two arm space intervals are big more, and formed vibration signal detection sensitivity is high more.
Can find out from the technical scheme and the principle of work of said system; A kind of region anti-intrusion light path system that the present invention proposes based on the fiber optic interferometric technology, through the border, protection zone being subdivided into the accurate location that intrusion event has been realized in a plurality of defence areas, the while is the boundary setting multiple defence line in the protection zone; The RST that detects according to different depths defence line; Can accurately distinguish intrusion event and random perturbation incident, effectively reduce system's false-alarm that non-intrusion event causes, that the fiber optic interferometric technology that adopts simultaneously has is highly sensitive, do not receive factor affecting such as temperature, weather; The strong advantage of anti-environmental disturbances ability is with a wide range of applications.
Description of drawings
The responsive synoptic diagram of the full section of Fig. 1 cable
One fibre optic interferometer of Fig. 2 is arranged on female cable synoptic diagram
Fig. 3 begins to be provided with the fibre optic interferometer synoptic diagram after in sub-cable, transmitting certain distance
Fig. 4 lays the mode synoptic diagram side by side
Fig. 5 twisted-pair feeder is laid the mode synoptic diagram
Fig. 6 fishing net shape mesh is laid the mode synoptic diagram
Fig. 7 laying mode synoptic diagram that walks abreast
Fig. 8 S molded lines fibre optic interferometer is laid the mode synoptic diagram
Fig. 9 helix fibre optic interferometer is laid the mode synoptic diagram
Defence area, gateway, Figure 10 teleswitch zone synoptic diagram
Defence area, gateway, Figure 11 cipher switch zone synoptic diagram
The multiplexing synoptic diagram of Figure 12 light source output terminal light path
The multiplexing synoptic diagram of Figure 13 light source output wavelength
Figure 14 region anti-intrusion system theory diagram
The female cable 2-of 1-fibre optic interferometer wherein
The pickup arm I of 3-Transmission Fibers 4-fibre optic interferometer
The pickup arm II 6-telepilot of 5-fibre optic interferometer
7-remote control signal receiver 8-region anti-intrusion system
9-signal wire 10-optical cable
11-Fibre Optical Sensor 12-enclosure wall
13-cipher inputting keyboard 14-code keypad signal wire
15-light source 16-delivery optics I
17-light path adapter 18-delivery optics II
19-protection zone 20-sensing light path
21-detector array 22-signal processor
Embodiment
In conjunction with accompanying drawing and embodiment the present invention is further specified, but should not limit protection scope of the present invention with this.
Embodiment. this routine formation is shown in figure 14, comprising: light source 15, delivery optics I 16, delivery optics II 18, light path adapter 17, detector array 21 and sensing light path 20; Sensing light path 20 is a fibre optic interferometer.
Light source 15 connects light path adapter 17 by delivery optics I 16; 17 outputs of light path adapter are connected each defence area of sensing light path by delivery optics II 18; The sensing light path takes back light path adapter 17 through delivery optics II 18 around the protection zone after one week once more; Light path adapter 17 connects detector array 21 light input ends by delivery optics I 16, detector array 21 output termination signal processors 22.
At first carry out defence area quantity, the design of defence line quantity according to the provincial characteristics that will protect and customer requirements, the zone of protection shown in figure 14 is provided with n defence area, three lines of defence; In each defence area, the twice defence line that is parallel to the border is all arranged, this twice defence line is spaced apart on depth; The per pass defence line is made up of one road Mach-Zehnder interferometer; Optical cable adopts the common communications optical cable, and mounting means is for to be provided with pickup arm and reference arm in same optical cable, and the laying mode is taken as linear pattern; The light that light source module 15 sends arrives light path adapter 17 through delivery optics I 16; Through passing to different defence areas, defence line respectively after the different beam splitting of light path adapter 17 formation, the defence line light path design is the interfere type light path in the defence area, and every road light signal all only gets into interferometer light path one time; The outer part of interferometer light path is transmission; Light signal, gets into light path adapter 17 once more through delivery optics II 18 at last, and then is transferred to detector array 21 through delivery optics I 16 after one week around the protection zone; Convert into and be transferred to signal processor 22 behind the electric signal and handle, report to the police when the intrusion event characteristic is arranged when the signal characteristic that detects possesses.
Wherein:
Light path adapter 17 selects 1 * n beam splitter;
Light source 15 selects Distributed Feedback Laser;
Photodetector array 21 selects OPC380.
For reducing the normal system's false-alarm of coming in and going out and causing in regional gateway; The employing of this example is a kind of disposes the defence area separately to regional gateway; And be equipped with the method for telepilot (see figure 10), the intrusion alarm function in defence area, temporary close gateway when making things convenient for the authorized person to come in and go out the protection zone for the normal authorized person who comes in and goes out; Its formation is on every fan door limit at gate, to enclose fibre optic interferometer 11 backs to connect region anti-intrusion system 8 by optical cable 10, connects remote control signal receiver 7 by region anti-intrusion system 8 through signal wire 9 again, is equipped with telepilot 6 again; On the area anti-intrusion main process equipment, connect remote control signal receiver 7, receive the warning function of closing or open the defence area, gateway behind the remote controller signal.
For effectively saving the fibre core resource, when adopting single wavelength light source, the light signal in different defence areas, defence line is aliasing each other, otherwise just can't accurately distinguish the source of disturbing signal, and therefore required fibre core quantity can be bigger when defence area quantity is big.In order to overcome this problem, the structure of this routine multiplexing fibre core:
Adopt the light sources transmit fibre core in each defence area; Shown in figure 12; The structure of its multiplexing fibre core is: light source meets adapter I by optical fiber, and adapter I output meets a corresponding defence area quantity adapter II, adapter III again ..., each adapter connects two fibre optic interferometers in this defence area respectively; Fibre optic interferometer I, fibre optic interferometer II like defence area I; The fibre optic interferometer III of defence area II, fibre optic interferometer IV etc., the output of these fibre optic interferometers connects cable splice closure in the lump, is connected to detector array by optical cable more at last;
The light that light source module sends is multi-beam by adapter I beam splitting during with an Optical Fiber Transmission to first defence area, and quantity is identical with the defence area number; When each bundle light arrives corresponding defence area, by adapter again beam splitting be multi-beam, get into each fibre optic interferometer in this defence area respectively.This scheme has been carried out the multiplexing of light path, fibre core quantity capable of reducing using at the light source output terminal and before arriving each defence area.
In sensing light path zone; If when having the invasion disturbance, can cause that the phase differential between two pickup arms changes, and then form interference signal; Through signal processor interference signal is analyzed; The suspicious disturbance event characteristic in border, protection zone is differentiated, if system produces and reports to the police when signal characteristic meets the intrusion behavior feature mode, if when signal characteristic does not conform to the intrusion behavior feature mode; System will not report to the police, and not only realizes the detection of regional intrusion event but also effectively reduces false alarm rate with this system.
This example is through test of many times; Vibration sensing fibre optic interferometer through on the border of protection zone, laying can be realized the detection to any disturbance behavior in border; Add whether the disturbance behavior that comprehensive judgement is picked up on time and space has the invasion characteristic; Reduced system's false alarm rate that incident causes largely,, provided the defence area positional information of intrusion event generation simultaneously if having the invasion characteristic then system's generation warning; If during with the miscellaneous equipment interlock drive signal is provided, accomplish signal transmission to miscellaneous equipment.
Claims (4)
1. region anti-intrusion light path system based on fibre optic interferometer; It is characterized in that with the protection zone boundary demarcation be a plurality of defence areas; Each defence area is provided with a plurality of above fibre optic interferometers and forms multiple defence line, constitutes the sensing light path (20) of region anti-intrusion light path system; Delivery optics I (16), delivery optics II (18), light path adapter (17) and sensing light path (20) constitute region anti-intrusion light path system; Sensing light path (20) is made up of the fibre optic interferometer in each defence area;
Light source (15) connects light path adapter (17) by delivery optics I (16); Light path adapter (17) output is connected the defence line in each defence area of sensing light path (20) by delivery optics II (18); Sensing light path (20) is passed through delivery optics II (18) once more around the protection zone and is taken back light path adapter (17) after one week; Light path adapter (17) connects detector array (21) light input end by delivery optics I (16), detector array (21) output termination signal processor (22);
The light that light source (15) sends arrives light path adapter (17) through delivery optics I (16), through being divided into the n road after light path adapter (17) beam splitting, corresponds respectively to n defence area; The defence line light path is a fibre optic interferometer in each defence area; Light signal is passed back through behind each defence area inner fiber interferometer; The flashlight that forms in the defence area, front is merely transmission when passing through follow-up defence area; Get into light path adapter (17) once more through delivery optics II (18) after one week around the protection zone, pass through delivery optics I (16) then and be transferred to detector array (21) and convert into and be transferred to signal processor (22) behind the electric signal and handle.
2. a kind of region anti-intrusion light path system according to claim 1 based on fibre optic interferometer; The formation that it is characterized in that said fibre optic interferometer is: in the periphery of protection zone a plurality of defence areas are set; Each defence area is provided with a plurality of above fibre optic interferometers and constitutes multiple defence line; Fibre optic interferometer between the defence area is connected by light path adapter (17), and the fibre optic interferometer of head end connects from light path adapter (17), and terminal fibre optic interferometer takes back light path adapter (17) again.
3. according to claim 1 and 2 described a kind of region anti-intrusion light path systems based on fibre optic interferometer, the form that it is characterized in that said fibre optic interferometer is the mixing use-pattern or the plug lattice nanogram interferometer of Michelson interferometer or Mach-Zehnder interferometer or Michelson interferometer and Mach-Zehnder interferometer.
4. a kind of region anti-intrusion light path system based on fibre optic interferometer according to claim 1, the structure that it is characterized in that multiple defence line are on the depth direction of border, and the multiple tracks fibre optic interferometer is set respectively; The multiple tracks fibre optic interferometer is separately positioned on the both sides and border on border.
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| CN104574732B (en) * | 2015-02-09 | 2017-09-01 | 四川西南交大铁路发展股份有限公司 | A kind of circumference system for monitoring intrusion based on vibration optical fiber technology |
| CN108230595B (en) * | 2018-01-05 | 2024-08-16 | 佛山市新东方电子技术工程有限公司 | Intrusion prevention alarm device and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5194847A (en) * | 1991-07-29 | 1993-03-16 | Texas A & M University System | Apparatus and method for fiber optic intrusion sensing |
| CN200955665Y (en) * | 2006-06-30 | 2007-10-03 | 中国石油天然气集团公司 | Optical-fiber safety prewarning device |
| CN101188036A (en) * | 2007-04-24 | 2008-05-28 | 华中科技大学 | Optical fiber peripheral warning and laser night vision linkage monitoring system |
| WO2008081157A1 (en) * | 2006-12-29 | 2008-07-10 | Schlumberger Holdings Limited | Fault-tolerant distributed fiber optic intrusion detection |
| CN201130407Y (en) * | 2007-12-21 | 2008-10-08 | 陈玉凤 | Device for monitoring perimeter safety |
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2009
- 2009-05-31 CN CN200910203251.9A patent/CN101901530B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5194847A (en) * | 1991-07-29 | 1993-03-16 | Texas A & M University System | Apparatus and method for fiber optic intrusion sensing |
| CN200955665Y (en) * | 2006-06-30 | 2007-10-03 | 中国石油天然气集团公司 | Optical-fiber safety prewarning device |
| WO2008081157A1 (en) * | 2006-12-29 | 2008-07-10 | Schlumberger Holdings Limited | Fault-tolerant distributed fiber optic intrusion detection |
| CN101188036A (en) * | 2007-04-24 | 2008-05-28 | 华中科技大学 | Optical fiber peripheral warning and laser night vision linkage monitoring system |
| CN201130407Y (en) * | 2007-12-21 | 2008-10-08 | 陈玉凤 | Device for monitoring perimeter safety |
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