CN101901531B - Fiber interferometer-based area anti-intrusion method - Google Patents
Fiber interferometer-based area anti-intrusion method Download PDFInfo
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- CN101901531B CN101901531B CN 200910203252 CN200910203252A CN101901531B CN 101901531 B CN101901531 B CN 101901531B CN 200910203252 CN200910203252 CN 200910203252 CN 200910203252 A CN200910203252 A CN 200910203252A CN 101901531 B CN101901531 B CN 101901531B
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Abstract
The invention discloses a fiber interferometer-based area anti-intrusion method, which comprises the following steps of: arranging one or more defense areas on the boundary of a protected area by a fiber interferometer according to the size of the protected area and different requirements on information accuracy of an intrusion alarm device, forming at least one complete enclosure for the protected area, and forming a complete enclosure for the protected area by connecting the plurality of defense areas in series or in parallel; making the light emitted from a light source pass through a transmission light path to reach a light path adapter, splitting beams into a plurality of paths by the light path adapter to correspond to the plurality of defense areas respectively; forming one or more defense lines parallel to the boundary in each defense area, wherein the plurality of defense lines are separated at intervals on depth, and each defense line consists of a path of fiber interferometer; and detecting the phase difference of optical signals transmitted in two arms of the fiber interferometer in each defense area, discriminating the characteristics of suspicious disturbance events on the boundary of the protected area, judging the position of a vibration signal by the system when the signal characteristic accords with an intrusion behavior characteristic mode and alarming by the system.
Description
Technical field
The present invention is a kind of area anti-intrusion method 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).Present 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, area anti-intrusion method 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 is to improve the induction sensitivity of interferometer to vibration signal through the space length that increases interferometer two pickup arms.
Region anti-intrusion system is through being subdivided into the border, protection zone the accurate location that intrusion event has been realized in a plurality of defence areas; 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.
Can be divided into main process equipment, delivery optics, light path adapter and interferometer light path on the region anti-intrusion system structure.When interferometer light path had detected disturbing signal and occurs, triggering system got into the state of alert, if continue to have disturbing signal to occur and its character symbol is incorporated into the behavioural characteristic pattern of invading, system produces and reports to the police.
The present invention is based on area anti-intrusion method: big or small with different to the accuracy requirement of intrusion alarm positional information according to the protection zone to the fibre optic interferometer of vibration sensing; Lay one or more defence areas by fibre optic interferometer on the border of protection zone; And to protection zone at least one complete encirclement of formation, a plurality of defence areas constitute a complete encirclement to the protection zone equally through series connection or parallel connection; The light that light source 15 sends arrives the light path adapter through delivery optics 16, by demultiplexing after 17 beam splitting of light path adapter, corresponds respectively to a plurality of defence areas; In each defence area, the defence line that is parallel to the border is all arranged, this defence line has spaced on depth, and the defence line is made up of No. one fibre optic interferometer; Detect the light signal phase difference value of transmission in each defence area fibre optic interferometer two pickup arm, the suspicious disturbance event characteristic in border, protection zone is differentiated, the position and the generation of system's judgement vibration signal were reported to the police when signal characteristic met the intrusion behavior feature mode.
In order effectively to improve the system alarm accuracy rate, in each defence area, lay above together fibre optic interferometer and constitute multiple defence line.When laying multiple defence line; When the vibration signal generation of doubtful invasion is detected in one of fixing certain or defence line, a few road; Activating system to one state of alert in a period of time that system is on the alert, is made the judgement of whether reporting to the police according to the acquisition of signal situation system in other defence line.
For reliable warning, the present invention also sets the state of alert perdurability of certain-length in time, when system the state of alert in perdurability the sensing light path detect the signal mode that meets the intrusion behavior characteristic and take place, system reports to the police.The warning message that system sends specifically comprises: the screen display that system carries; The auditory tone cues that system carries; The warning trigger pip that system generates and other system links; System sends wireless messages and notifies the related personnel; System sends information to the remote monitoring end.
Wherein:
The series connection in a plurality of defence areas is meant does not have overlapping part between the adjacent defence area;
It is certain overlapping that the parallel connection in a plurality of defence areas is meant that a plurality of defence areas have, adjacent defence area, space have certain overlapping in along certain extension is arranged on the boundary direction;
Fibre optic interferometer to vibration sensing in each defence area is the mixing use-pattern of Michelson interferometer or Mach-Zehnder interferometer or Michelson interferometer and Mach-Zehnder interferometer; Particularly fibre optic interferometer can also be a plug lattice nanogram interferometer except can be for above-mentioned three kinds of modes when the border, protection zone is merely a defence area; When in the zone at fibre optic interferometer place, having vibration to occur; Can cause the light phase of transmission in the fibre optic interferometer pickup arm to occur changing; Because vibration is different to the influence that fibre optic interferometer two pickup arms that are in different spatial produce; A difference relevant with vibration can appear in the light signal phase place of transmission in two pickup arms, realizes the detection to vibration signal through the detection to this phase difference value;
The distribution method of each fibre optic interferometer in each defence area: when fibre optic interferometer was laid, fibre optic interferometer branched away from female cable as sub-cable; In each defence area, the sub-cable of sensing can be the responsive (see figure 1) of full section when the multiple tracks fibre optic interferometer was laid, and from female cable 1, told fibre optic interferometer 2 and laid, and then got into female cable 1 and passed back through Transmission Fibers 3; Also can be through beginning to be provided with interferometer again after the certain distance transmission in sub-cable; 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 and lay, then get into female cable 1 and pass (seeing Fig. 2) back by 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 lay, then get into female cable 1 and pass (see figure 3) back by Transmission Fibers 3; The pickup arm I 4 of fibre optic interferometer, the pickup arm II5 of fibre optic interferometer can be laid in the identical or different beam tube in the optical cable; Can learn according to above-mentioned phase differential production process: far away more if fibre optic interferometer two pickup arms separate on the locus; The phase change common mode composition that vibration produces is more little; The differential mode composition is big more, and the phase differential that promptly produces can be big more, has higher vibration detecting sensitivity; Can also the pickup arm I 4 of fibre optic interferometer, the pickup arm II 5 of fibre optic interferometer be laid in the different optical cables; The optical cable that these two pickup arms belong to respectively spatially can be adjacent or intersects or separate; Adjacent can be form (see figure 4) or twisted-pair feeder form (see figure 5) side by side; Intersection can be that two pickup arm optical cables interweave and constitute the version (see figure 6) of fishing net shape; Separate and be meant that two pickup arm optical cables are parallel and lay, have distance laying mode (see figure 7) at interval between two optical cables;
The distribution method of each fibre optic interferometer: can be that linear pattern or arc line type are laid or S type curve is laid the perhaps mixed form of several kinds of above-mentioned situation of perhaps spiral line type curve laying;
Wherein:
Linear pattern and arc line type are laid 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 laid and is meant that fibre optic interferometer is according to the form laying around S type curve;
Spiral line type curve (see figure 9) is laid a kind of mode that is meant that fibre optic interferometer is laid along the spiral line type curve, and this helix can be plane curve or space multistory curve;
Wherein S type and spiral line type curve are laid 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 laying mode of multiple defence line is on the depth direction of border, lays respectively together or multiple tracks fibre optic interferometer light path; The multiple tracks fibre optic interferometer is laid in respectively on the both sides and border on border; Be laid in subsurface or direct exposing on the ground in the inboard on border, be laid in subsurface in the outside on border; 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 like the border; On the inside and outside both sides and enclosure wall body of wall of enclosure wall; Lay respectively together or the multiple tracks fibre optic interferometer, wherein the inside and outside fibre optic interferometer of enclosure wall can be embedded in subsurface or directly exposed on the ground, the fibre optic interferometer on the body of wall can be to be embedded in the body of wall in the body of wall cutting; Can be when the building wall, to be embedded in the body of wall; Can be to adopt the ply-yarn drill nail directly to follow closely at surface of wall, can be to adopt the mode of tying up that interferometer light path is banded on the entanglement, also can mix and adopt above-mentioned several kinds of fixed forms.
For reducing the normal system's false-alarm of coming in and going out and causing in regional gateway; In protection implementation process to big regional many defence areas; A normal high problem of false alarm rate of coming in and going out and causing such as regional gateway such as gate has appearred in the anti-invasive system in zone; The present invention takes regional gateway is disposed separately the method in defence area; And when personnel normally come in and go out, be equipped with remote control (see figure 10) or cipher switch (seeing Figure 11), open and close is implemented in the defence area, gateway, can effectively solve the normal system's false-alarm problem of coming in and going out and causing in gateway.
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, therefore required fibre core quantity can be bigger when defence area quantity is big, limited the application of region anti-intrusion system.In order to overcome this problem; The present invention proposes the mode of two kinds of multiplexing fibre cores: first kind is not the way that adopts the transmission in per pass fibre optic interferometer defence line fibre core for light source sends behind the light; But adopt the scheme of each light sources transmit fibre core in defence area; Behind the light arrival defence area that light source sends, arrive each defence line through a beam splitter beam splitting corresponding to defence line quantity again, the fibre optic interferometer in each defence line pools together again, behind boundling, passes processing (seeing Figure 12) back; This scheme in a plurality of defence areas has been carried out the multiplexing of light path at the light source output terminal, has saved the fibre core number to a certain extent, has expanded the application of region anti-intrusion system; The second way is for adopting the form of wavelength multiplexing; Be coupled into a fibre core to wide spectrum light source through the narrow-band light source that forms a plurality of different wavelengths or a plurality of different wave lengths behind the comb filtering; When getting into each defence area, through more then and separating wavelength-division multiplex, separate different wavelengths, get into different defence areas respectively; The flashlight of the identical anti-line position in different defence areas can be coupled into same optical fiber once more; Pass back through delivery optics and to separate wavelength division multiplexer through several respectively behind the system host equipment and carry out demultiplexing (seeing Figure 13), this mode can reduce the fibre core use amount to a greater extent, reduces equipment complexity, reduces cost.
The optical signal transmission of transmission is given the main process equipment of system in each defence area fibre optic interferometer two pickup arm; Detect the light signal phase difference value that transmits in each defence area fibre optic interferometer two pickup arm by main process equipment; The suspicious disturbance event characteristic in border, protection zone is differentiated, and system judged the position of vibration signal and produces warning when signal characteristic met the intrusion behavior feature mode.
The main process equipment part is shown in figure 14, comprising: light source 15, detector array 21, signal processor 22, alarm unit 23.The sensing light path 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 input ends, signal processor 22 outputs unit 23 taking alarm.
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 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 system that this method makes up is strong, has tangible performance advantage and application prospects.Region anti-intrusion system is realized the intrusion event detection based on the sensing to vibration; Because geological condition is complicated and changeable, the attenuation by absorption of the vibration of verifying widely different differently, for the adaptability of increase system to different geologic conditions; The present invention proposes the method for a kind of different spaces apart from two pickup arms of interval laying optical fiber interferometer; This method can form different vibration signal detection sensitivitys, and 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 method; The present invention is through being subdivided into the border, protection zone the accurate location that intrusion event has been realized in a plurality of defence areas; The boundary setting multiple defence line in the protection zone according to the RST that different depths defence line is detected, can accurately be distinguished intrusion event and random perturbation incident simultaneously; 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, and 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 principle schematic
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
The 23-alarm unit
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: main process equipment, delivery optics, light path adapter and sensing light path.Main process equipment partly comprises: light source 15, detector array 21, signal processor 22, alarm unit 23.The sensing light path 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 input ends, signal processor 22 outputs unit 23 taking alarm.
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 system source module 15 is sent 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; Every road light signal all only gets into interferometer light path one time, and the outer part of interferometer light path is transmission, and light signal centers on the protection zone after one week; Get into light path adapter 17 once more through delivery optics II 18 at last; And then be transferred to detector array 21 through delivery optics I 16, and convert into and be transferred to signal processor 22 behind the electric signal and handle, produce and report to the police when the signal characteristic that detects possesses when the intrusion event characteristic is arranged alarm unit 23.
Wherein:
Light path adapter 17 selects 1 * n beam splitter;
Light source 15 selects Distributed Feedback Laser;
Photodetector array 21 selects OPC380;
Signal processor 22 selects TMS320C6713;
Alarm unit 23 selects the YBT59-225 loudspeaker.
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 (2)
1. area anti-intrusion method based on fibre optic interferometer; Big or small according to the protection zone with different to the accuracy requirement of intrusion alarm positional information; Lay a plurality of defence areas by fibre optic interferometer on the border of protection zone; And to protection zone at least one complete encirclement of formation, a plurality of defence areas constitute a complete encirclement to the protection zone equally through series connection or parallel connection; The light that light source sends arrives the light path adapter through delivery optics, by demultiplexing after the beam splitting of light path adapter, corresponds respectively to a plurality of defence areas; In each defence area, the multiple defence line that is parallel to the border is all arranged, this multiple defence line has spaced on depth, and the per pass defence line is made up of No. one fibre optic interferometer; Detect the light signal phase difference value of transmission in each defence area fibre optic interferometer two arm, the suspicious disturbance event characteristic in border, protection zone is differentiated, the position and the generation of system's judgement vibration signal were reported to the police when signal characteristic met the intrusion behavior feature mode; It is characterized in that in each defence area, laying the multiple tracks fibre optic interferometer and constitute multiple defence line; When laying multiple defence line; When the vibration signal generation of doubtful invasion is detected in one of fixing certain or defence line, a few road; Activating system to one state of alert in a period of time that system is on the alert, is made the judgement of whether reporting to the police according to the acquisition of signal situation system in other defence line.
2. a kind of area anti-intrusion method according to claim 1 based on fibre optic interferometer; It is characterized in that in each defence area; The sub-cable of the sensing of multiple tracks fibre optic interferometer is that full section is responsive; From female cable (1), tell fibre optic interferometer (2) and lay, then get in female cable (1) and pass back by Transmission Fibers (3); Or in the sub-cable of sensing, begin to be provided with fibre optic interferometer again after the transmission of process certain distance; When the multiple tracks fibre optic interferometer is laid one fibre optic interferometer is arranged in the female cable of transmission, from female cable (1), tells fibre optic interferometer (2) and lay, then get into female cable (1) and pass back through Transmission Fibers (3); Or the per pass defence line is all corresponding to a sub-cable of sensing, from female cable (1), tells fibre optic interferometer (2) and lays, and then gets into female cable (1) and passes back through Transmission Fibers (3).
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| CN107660300B (en) * | 2015-03-24 | 2021-01-29 | 开利公司 | System and method for providing a graphical user interface indicating intruder threat levels for a building |
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| CN109884704A (en) * | 2019-01-18 | 2019-06-14 | 潜能恒信能源技术股份有限公司 | A kind of device and method for eliminating optical fiber detector system noise |
| CN110485880A (en) * | 2019-08-16 | 2019-11-22 | 武汉闪联科技有限公司 | A kind of optics door lock anti-prizing alarm device |
| CN112288974A (en) * | 2020-10-23 | 2021-01-29 | 北京玄天智联科技有限公司 | Micro-vibration perimeter intrusion detection method, device, equipment and storage medium |
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| CN201188005Y (en) * | 2008-04-22 | 2009-01-28 | 宁波诺可电子科技发展有限公司 | Bidirectional light path-sharing distributed optical fibre interferometer |
| CN101271605A (en) * | 2008-04-24 | 2008-09-24 | 复旦大学 | Optical fiber code locating method for optical fiber sensing security system |
| CN101901532A (en) * | 2009-05-31 | 2010-12-01 | 中国石油天然气管道局 | Optical fiber interferometer arrangement method of region anti-intrusion system based on optical fiber interferometer |
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