CN207909272U - A kind of double parameter OTDR perimeter securities monitoring systems - Google Patents

Abstract

The utility model discloses a kind of double parameter OTDR perimeter securities to monitor system, belongs to perimeter security detection field；Including monitor terminal, the synchronous modulated signal generated is inputted P OTDR systems and φ OTDR systems by the monitor terminal respectively, the signal of acquisition is back to the data analysis of monitor terminal progress two dimensions of time and space and exports alarming result by the P OTDR systems and φ OTDR systems, and use synchronous modulation signal, when the detecting optical cable B for detecting optical cable A and φ the OTDR systems that guarantee is applied to P OTDR systems when monitoring circumference intrusion behavior, it can correspond completely over time and space, two optical cables acquisition signal is at same location when making later stage signal processing, it realizes and mutually confirms, it is accurately positioned, positioning accuracy is ± 10m, and rate of false alarm is low.

Description

A kind of double parameter OTDR perimeter securities monitoring systems

Technical field

The utility model is related to railway perimeter security detection fields, and in particular to a kind of double parameter OTDR perimeter securities monitorings System.

Background technology

With the fast development of high-speed railway, railway fight against terrorism and violence demand is increasingly apparent, and the safety on railway periphery also faces Important test, for the factors such as rail track is long, span is big, surrounding enviroment are complicated, explores and adapts to railway special applications scene Circumference monitoring technology the problem of being urgent need to resolve.

The technology that perimeter protection mainly uses at present has：Pulse electronic fence, infrared emission, microwave wall, thermal imaging video The modes such as analysis, vibration optical cable, however the technical equipment such as pulse electronic fence, infrared emission, microwave wall, thermal imaging video analysis It is active, is vulnerable to electromagnetic interference, is also that can not use in inconvenient these front-end detectors of section of bad environments, power supply , and these technologies are unable to carry out long distance monitoring.Railway it is existing based on optical fiber sensing technology equipment mostly be based on light Fine grating or sagnic principles, grating type optical fiber monitoring of tools distance is shorter, is not easy to carry out long distance monitoring, sagnic principles Type equipment positioning accuracy is poor, and form of construction work complexity is cumbersome.

" a kind of deformation formula optical fiber fence system and its detection invasion are movable for the patent of Patent No. 201510537189.2 Method " discloses the fence system including a P-OTDR module and a sensing optic cable, and the system is to simple extraneous vibration It is insensitive, and it is more sensitive to the deformation of optical cable, and this also limits its detectivity model to intrusion event to a certain extent It encloses, and the system can only carry out the output of warning message by setting the size of intensity threshold, cannot be carried out to intrusion event Pattern-recognition achievees the purpose that exclude interference signal in turn.Polarization sensitive optical time domain reflection instrument (P-OTDR) is by Englishman What A.J.Rogers put forward in 1998, P-OTDR system structures and Φ-OTDR systems are closely similar, and difference lies in annulars More Polarization Controllers between 3 port of device and detector, function are the polarization states to Rayleigh scattering light after modulation, are only allowed Rayleigh scattering light on single polarization state direction passes through.

" a kind of rail foreign matter based on phase sensitive optical time domain reflectometer enters the patent of Patent No. 201710003630.8 Invade monitoring method " disclose utilize phase-sensitive optical time domain reflectometer (Φ-OTDR) technology acquisition rail along raw scattered Optical signal, and carry out rail foreign body intrusion monitoring in circumference invasion application using raw scattered optical signal and use Φ-merely OTDR technique system due to its with higher sensitivity to wind and rain, toy, vehicle pass through and some background vibration sources generate Vibration signal can preferably be detected, however just because of this, although having used pattern-recognition when later data processing Method remains difficult to vibration interference caused by excluding toy, unknown vibration source etc. completely, higher so as to cause the rate of false alarm of system, this Interference signal fade-out existing for outer Φ-OTDR systems often causes the leak detection problem of system, seriously constrains its practicality Property.Optical time domain reflectometer (Φ-OTDR) technology of phase-sensitive was proposed have more than 20 so far by H.F.Taylor in 1993 Year developing history, which has reached its maturity, it can within the scope of long range multiple points on detection optical fiber circuit simultaneously Vibration Condition, by signal analysis and processing to invasion vibration event carry out pattern-recognition, monitoring distance be about 60km, space Resolution ratio is about ± 20m.

Single phase-sensitive optical time domain reflectometer (Φ-OTDR) technology and polarization sensitive optical time domain reflection are used above Instrument (P-OTDR) technology, protective range is small or rate of false alarm is high.

Utility model content

The purpose of this utility model is that：A kind of double parameter OTDR perimeter securities monitoring systems are provided, solve current iron Road circumference is using the high technical problem of single protection method rate of false alarm.

The technical solution adopted in the utility model is as follows：

A kind of double parameter OTDR perimeter securities monitoring systems, including monitor terminal, what the monitor terminal synchronous will generate Modulated signal inputs P-OTDR systems and Φ-OTDR systems respectively, and the P-OTDR systems and Φ-OTDR systems are by the letter of acquisition Monitor terminal number is back to carry out the data analysis of two dimensions of time and space and export alarming result.

Further, the output end of the P-OTDR systems is separately connected interference unit and photodetector, the interference Unit connects the photodetector, and the photodetector connects the monitor terminal；The output end of the Φ-OTDR systems Connect the interference unit.

Further, the P-OTDR systems include pulse laser, circulator A, detecting optical cable A and polarization beam apparatus, The modulated signal that the monitor terminal generates, which is input to the pulse laser, makes the pulse laser generation is modulated to swash Modulated laser is inputted the delivery outlet A connection detecting optical cable A of circulator A, the circulator A by light, the pulse laser, Delivery outlet B of the signal of acquisition through the circulator A is back to the polarization beam apparatus, the polarization by the detecting optical cable A Signal is divided into two-way and inputs the interference unit and photodetector respectively by beam splitter.

Further, the Φ-OTDR systems include narrow linewidth laser, acousto-optic modulator, erbium-doped fiber amplifier A, The modulated signal of generation is input to the acousto-optic modulator, institute by circulator B and erbium-doped fiber amplifier B, the monitor terminal It states the laser that acousto-optic modulator generates the narrow linewidth laser to be modulated, the acousto-optic modulator is by modulated laser Through laser circulator B, the circulator B delivery outlets A connection detecting optical cable B, the detection are input to through erbium-doped fiber amplifier A Delivery outlet B of the signal of acquisition through circulator B is back to erbium-doped fiber amplifier B, the erbium-doped fiber amplifier B by optical cable B Connect the interference unit.

Further, the detecting optical cable A is layed on the thorn basket structure on circumference top.

Further, the detecting optical cable B is layed on the Fence structure of circumference lower part.

In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：

1. double parameters are carried out comprehensive monitoring by the system, and use synchronous modulation signal, guarantee is applied to P-OTDR systems Detecting optical cable A and Φ-OTDR systems detecting optical cable B when can geographically correspond, make later stage signal processing When two optical cables acquisition signal it is at same location, realization is accurately positioned, positioning accuracy be ± 10m.

The signal all the way of 2.P-0TDR system acquisitions is occurred with the signal of Φ-OTDR system acquisitions by interference unit dry It relates to, improves interference signal susceptibility, while effectively inhibiting Φ-OTDR system intervention signal fadeout phenomenons, Φ-OTDR systems is made to exist It also can accurately be positioned, be detected in the case that vibration signal is very weak, improve signal detection rating.

3. two same positions of dimension comprehensive analysis optical cable of room and time can be passed through in signal processing using this system The alarm parameters of place's P-OTDR systems and Φ-OTDR systems carry out invasion time warning message output in turn, compensate for single skill The high defect of art system rate of false alarm, improves the accuracy rate of system alarm.

4. detecting optical cable A is layed on thorn basket structure, detecting optical cable B is layed on Fence structure, not only ensures that system is good Good sensing effect, forms three-dimensional protection, expands the protective range of system.

5. this system can be judged for different behaviors, while for interference scene (such as wind and rain weather, excessive fire Vehicle, traction engine etc.), two systems are combined and interference can effectively be shielded.

6. this system can be not only used for the detection of high ferro perimeter security, military base, base station, border can be equally used for The protection field that the similar circumference such as line is formed, has a wide range of application.

Description of the drawings

The utility model will illustrate by embodiment and with reference to the appended drawing, wherein：

Fig. 1 is the integrated stand composition of the utility model；

Fig. 2 is schematic diagram of the utility model when being laid with；

Fig. 3 is the position view of the utility model optical cable；

Fig. 4 is that double parameter alarms compare confirmation flow chart in the utility model；

Fig. 5 is double parameter alarm signal response characteristic figures at same position, and (a) is Φ-OTDR system response characteristic figures, (b) it is P-OTDR system response characteristic figures；

Reference numeral：1- monitor terminals, 2- detecting optical cables A, 3- detecting optical cable B, 4- pierce cage, 5- fences, the bis- parameters of 6- OTDR hosts, 7- guide optical cable, 8- bands.

Specific implementation mode

All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive Feature and/or step other than, can combine in any way.

It elaborates below in conjunction with the accompanying drawings to the utility model.

A kind of double parameter OTDR perimeter securities monitor system, including monitor terminal 1, and the monitor terminal 1 is by the tune of generation Signal processed inputs P-OTDR systems and Φ-OTDR systems respectively, and the P-OTDR systems and Φ-OTDR systems are by the signal of acquisition It is back to the progress data processing of monitor terminal 1 and obtains testing result.

The output end of the P-OTDR systems is separately connected interference unit and photodetector, and the interference unit connects institute Photodetector is stated, the photodetector connects the monitor terminal 1；Described in the output end connection of the Φ-OTDR systems Interference unit.

The P-OTDR systems include pulse laser, circulator A, detecting optical cable A2 and polarization beam apparatus, the monitoring The modulated signal that terminal 1 generates, which is input to the pulse laser, makes the pulse laser generate modulated laser, described Modulated laser is inputted the delivery outlet A connection detecting optical cable A2 of circulator A, the circulator A, the spy by pulse laser It surveys optical cable A2 and delivery outlet B of the signal of acquisition through the circulator A is back to the polarization beam apparatus, the polarization beam apparatus Signal is divided into two-way and inputs the interference unit and photodetector respectively.

Φ-OTDR the systems include narrow linewidth laser, acousto-optic modulator, erbium-doped fiber amplifier A, circulator B and The modulated signal of generation is input to the acousto-optic modulator, the acousto-optic tune by erbium-doped fiber amplifier B, the monitor terminal 1 The laser that device processed generates the narrow linewidth laser is modulated, and the acousto-optic modulator passes through modulated laser through laser Erbium-doped fiber amplifier A is input to circulator B, the circulator B delivery outlets A connection detecting optical cables B3, the detecting optical cable B3 Delivery outlet B of the signal of acquisition through circulator B is back to erbium-doped fiber amplifier B, erbium-doped fiber amplifier B connections institute State interference unit.

The detecting optical cable A2 is layed in 4 structure of thorn cage on circumference top.

The detecting optical cable B3 is layed in 5 structure of fence of circumference.

Specific embodiment 1

A kind of double parameter OTDR perimeter securities monitor system, including monitor terminal 1, and the monitor terminal 1 is by the same of generation Step modulated signal inputs P-OTDR systems and Φ-OTDR systems respectively, and the P-OTDR systems and Φ-OTDR systems are by acquisition Signal is back to the progress data processing of monitor terminal 1 and obtains testing result；Due to the technology of P-OTDR systems and Φ-OTDR systems Maturation, therefore the method that monitor terminal 1 is handled is identical, is the prior art, and two systems are carried out to judge circumference after integrating Safety, positioning it is more accurate, it is more relatively reliable than single system；Monitor terminal 1 is used for Parameter Modulation signal, carries out at signal Manage and carry out the display of result.

Specific embodiment 2

Preferably, P-OTDR systems and Φ-OTDR systems are carried out using interference unit and photodetector effective comprehensive It closes, the output end of the P-OTDR systems is specially separately connected interference unit and photodetector, the interference unit connects The photodetector is connect, the photodetector connects the monitor terminal 1；The output end of the Φ-OTDR systems connects The interference unit；The signal all the way of P-OTDR system acquisitions occurs with the signal of Φ-OTDR system acquisitions in interference unit dry It relates to, improves interference signal susceptibility, while effectively inhibiting Φ-OTDR system intervention signal fadeout phenomenons, in acquisition signal It can also carry out accurately acquiring positioning in the case of very weak；Meanwhile even if enhancing the susceptibility of Φ-OTDR system signals, number According to processing mode it is identical；Interference unit and photodetector are the prior art, wherein interference unit using optical instrument into Row interference.

Specific embodiment 3

Preferably, the P-OTDR systems include pulse laser, circulator A, detecting optical cable A2 and polarization beam apparatus, institute The modulated signal for stating the generation of monitor terminal 1 is input to the pulse laser pulse laser is made to generate and modulated swashs Modulated laser is inputted the delivery outlet A connection detecting optical cables of circulator A, the circulator A by light, the pulse laser Delivery outlet B of the signal of acquisition through the circulator A is back to the polarization beam apparatus by A2, the detecting optical cable A2, described Signal is divided into two-way and inputs the interference unit and photodetector respectively by polarization beam apparatus；

Φ-OTDR the systems include narrow linewidth laser, acousto-optic modulator, erbium-doped fiber amplifier A, circulator B, visit Optical cable B3 and erbium-doped fiber amplifier B is surveyed, the modulated signal of generation is input to institute by the monitor terminal 1 by acousto-optic driver Acousto-optic modulator is stated, the laser that the acousto-optic modulator generates the narrow linewidth laser is modulated, the acousto-optic modulation Modulated laser is input to circulator B by device through laser through erbium-doped fiber amplifier A, and the circulator B delivery outlets A connections are visited It surveys optical cable B3, the detecting optical cable B3 and delivery outlet B of the signal of acquisition through circulator B is back to erbium-doped fiber amplifier B, institute State the erbium-doped fiber amplifier B connections interference unit (as shown in Figure 1).

Specific embodiment 4

The interference unit, photodetector, pulse laser, circulator A, polarization beam apparatus, narrow linewidth laser, sound Optical modulator, erbium-doped fiber amplifier A, circulator B, erbium-doped fiber amplifier B collectively form double parameter OTDR hosts 6, are convenient for Management；Photodetector, pulse laser and acousto-optic driver in double parameter OTDR hosts 6 connect monitor terminal, double ginsengs Circulator A and circulator B is by guiding optical cable 7 to be separately connected detecting optical cable A2 and detecting optical cable B3 (as schemed in amount OTDR hosts 6 Shown in 2).

Specific embodiment 5

System, further open kind of the Along Railway optical cable of the utility model are monitored based on a kind of double parameter OTDR perimeter securities Laying method, specially：

The corresponding detecting optical cable A2 of P-OTDR systems is layed in thorn cage 4 at 1/3 position below railway side (such as Fig. 3 institutes Show), it is once stretched as possible at interval of 35-50cm bindings, avoids being in entirely free on his state；The corresponding spy of Φ-OTDR systems The fence 5 that survey optical cable B3 is layed in circumference is bound, at interval of 35-50cm close to railway side middle and upper part position using band 8 Binding is primary, and detecting optical cable B3 is contacted with cement post jamb or iron bar wall as possible, it is ensured that vibration is fully transmitted；When binding optical cable not Can there are large curved, the radius of bending to be more than 15cm；The wiring of S types, U-shaped wiring also can be used in the laying mode of detecting optical cable A2 Deng；The modes such as buried wiring also can be used in detecting optical cable B3.

Go out to have fusion point for 1-1.5 kilometers due to optical cable interval, there are one section of disk cable, (disk cable length is about at each fusion point For 10-30m), disk cable needs abundant fixation, the case where not allowing to loop there are disk cable or optical cable other than at fusion point.

For the installation of monitor terminal 1 along the railway in communications equipment room, monitor terminal 1 can carry out real-time response intrusion alarm, And support to expel system interlink with video, sound, carrying out the system integration with other monitoring means forms multi-faceted protection.

System for field monitoring distance is more than 20km, and spatial resolution is less than ± 10m.

Specific embodiment 6

System is monitored based on a kind of double parameter OTDR perimeter securities, the comprehensive judging method of the utility model is (such as Fig. 4 institutes Show) be：

According to monitor terminal to the characteristic response figure (as shown in Figure 5) of Φ-OTDR systems and P-OTDR systems, carry out following Judge：

1) 5 behavior of fence is crossed in climbing：

When climbing Cement guard bar or iron bar, vibration detecting optical cable B3 captures the vibration information at climbing position, into Row pre-alarm, when continue climbing touch thorn cage 4 when, vibration detecting optical cable A2 detect thorn cage 4 shake information, generate forecast It is alert, and then handled from space and the pre-alarm information of dimension pair two of time two, and export final warning message (two systems Pre-warning time interval united less than 2 minutes).

2) thorn 4 behavior of cage is crossed

When only crossing thorn cage 4, the shaking of thorn cage 4 can cause detecting optical cable B3 and detecting optical cable A2 to be detected simultaneously by vibration Signal, (two system early warning time intervals are less than 2 points to the warning information output warning message of two paths of signals at comprehensive same position Clock).

3) Cement guard bar or iron bar behavior are destroyed

When only climbing cement shield or column iron bar, detecting optical cable B3 will detect that vibration signal, at signal analysis Reason and mode identification technology exclude climbing, cross other interference vibration signals such as vehicle, wind and rain to destruction progress warning output.

Claims (6)

1. a kind of double parameter OTDR perimeter securities monitor system, it is characterised in that：Including monitor terminal (1), the monitor terminal (1) the synchronous modulated signal generated is inputted into P-OTDR systems and φ-OTDR systems, the P-OTDR systems and φ-respectively The signal of acquisition is back to the data analysis of monitor terminal (1) progress two dimensions of time and space and exports report by OTDR systems Alert result.

2. a kind of double parameter OTDR perimeter securities according to claim 1 monitor system, it is characterised in that：The P-OTDR The output end of system is separately connected interference unit and photodetector, and the interference unit connects the photodetector, described Photodetector connects the monitor terminal (1)；The output end of the φ-OTDR systems connects the interference unit.

3. a kind of double parameter OTDR perimeter securities according to claim 2 monitor system, it is characterised in that：The P-OTDR System includes pulse laser, circulator A, detecting optical cable A (2) and polarization beam apparatus, the modulation that the monitor terminal (1) generates Signal, which is input to the pulse laser, makes the pulse laser generate modulated laser, and the pulse laser will be modulated The delivery outlet A connection detecting optical cable A (2) of laser input circulator A, the circulator A afterwards, the detecting optical cable A (2) will adopt Delivery outlet B of the signal of collection through the circulator A is back to the polarization beam apparatus, and signal is divided into two by the polarization beam apparatus Road inputs the interference unit and photodetector respectively.

4. a kind of double parameter OTDR perimeter securities according to claim 2 monitor system, it is characterised in that：The φ- OTDR systems include narrow linewidth laser, acousto-optic modulator, erbium-doped fiber amplifier A, circulator B and erbium-doped fiber amplifier B, The modulated signal of generation is input to the acousto-optic modulator by the monitor terminal (1), and the acousto-optic modulator is to the narrow line The laser that wide laser generates is modulated, and the acousto-optic modulator is by modulated laser through laser through erbium-doped fiber amplifier A is input to circulator B, the circulator B delivery outlets A connection detecting optical cable B (3), and the detecting optical cable B (3) is by the letter of acquisition Number delivery outlet B through circulator B is back to erbium-doped fiber amplifier B, and the erbium-doped fiber amplifier B connections interference is single Member.

5. a kind of double parameter OTDR perimeter securities according to claim 3 monitor system, it is characterised in that：The detection light Cable A (2) is layed in thorn cage (4) structure on circumference top.

6. a kind of double parameter OTDR perimeter securities according to claim 4 monitor system, it is characterised in that：The detection light Cable B (3) is layed in fence (5) structure of circumference lower part.