CN207624123U - A kind of deformation formula fiber fence device - Google Patents
A kind of deformation formula fiber fence device Download PDFInfo
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- CN207624123U CN207624123U CN201721009364.1U CN201721009364U CN207624123U CN 207624123 U CN207624123 U CN 207624123U CN 201721009364 U CN201721009364 U CN 201721009364U CN 207624123 U CN207624123 U CN 207624123U
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- deformation formula
- sensing optic
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Abstract
The utility model discloses a kind of deformation formula fiber fence devices, it is characterized in that, including P OTDR modules and a sensing optic cable being attached thereto, the P OTDR modules include the control unit being linked in sequence, optical pulse generator, 1x2 optical branching devices, cable terminal box and optical receiver, the external fibre reflector of 1x2 optical branching devices, cable terminal box connect sensing optic cable.The interference that is low, easy to operate, being avoided that the produced disturbance of optical fiber jump cable between Fibre Optical Sensor active module embedded therein and sensing optic cable of this installation cost, practicability are good.
Description
Technical field
The utility model is related to sensory field of optic fibre, more particularly to Polarization-Sensitive-optical time domain reflectometer technology and optical fiber
Fence technology, specifically a kind of deformation formula fiber fence device.
Background technology
In safety-protection system, the invasion activity that can detect, deformation formula fiber fence are deformed upon by detecting sensing optic cable
Device is other than having the advantages that Electro Magnetic Compatibility is good, operating distance is long and is full distributed, for strong wind and heavy rain interference, petty action
Object interference, the interference of high intensity background vibration, the interference free performance having had are higher for the positioning accuracy for invading moving position.
Deformation formula fiber fence passes through Polarization-Sensitive-optical time domain reflectometer technology（P-OTDR）Carry out the hair of detecting optical cable deformation
It is raw.When installing deformation formula fiber fence, the optical fiber using 3-5m is needed to jump cable by the active part and sensing optic cable of P-OTDR
It connects, and optical fiber jump cable is usually relatively soft, is easy to be influenced to generate deformation by extraneous factor, is thus generated to system dry
It disturbs.If being used as connection using polarization maintaining optical fibre jumps cable, this interference can be greatly reduced, but polarization maintaining optical fibre jump cable price compared with
Height, and be output between polarization maintaining optical fibre jumps cable in laser and also need to increase Polarization Controller, to ensure laser output
Polarization direction is consistent with the polarization maintaining optical fibre jump major axes orientation of cable.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, and to provide a kind of deformation formula fiber fence device.This
Kind of installation cost is low, it is easy to operate, be avoided that between Fibre Optical Sensor active module embedded therein and sensing optic cable that optical fiber jumps disturbance produced by cable
Interference, practicability is good.
Realizing the technical solution of the utility model aim is：
A kind of deformation formula fiber fence device, including P-OTDR modules and a sensing optic cable being attached thereto, the P
- OTDR modules include the control unit being linked in sequence, optical pulse generator, 1x2 optical branching devices, cable terminal box and light-receiving
Device, the external fibre reflector of 1x2 optical branching devices, cable terminal box connect sensing optic cable.
The cable terminal box is equipped with optical directional coupler, light is polarized/analyzer, and the public port of optical directional coupler connects
It connects light and is polarized/analyzer, a port in other two port of optical directional coupler connects light arteries and veins by 1x2 optical branching devices
Generator output end is rushed, another port connects optical receiver input terminal, and light is polarized/analyzer and a light in sensing optic cable
Fibre connection.
Described control unit uses embedded system (such as DSP).
The optical pulse generator is the LD light sources of F-P types.
The optical directional coupler is optical circulator or optical branching device.
The optical receiver is APD photodetectors or PIN photoelectric detector.
The sensing optic cable is the single mode fiber cable of communication.
The fibre reflector can return to a part of output light signal reflex of LD light sources in the LD light sources of F-P types.
Optical pulse generator output random polarization optical signal through optical directional coupler be output to light be polarized/analyzer in,
Optical signal to the rear is played to be sent in an optical fiber of sensing optic cable；The Rayleigh scattering signal returned from sensor fibre is sent to light
Be polarized/analyzer in, be detected signal to the rear through optical directional coupler, be sent to optical receiver.
Two ports of optical directional coupler are respectively connected to the light arteries and veins of OTDR modules using two ordinary optic fibres jump cables
Rush generator output end, optical receiver input terminal.
Optical pulse generator uses the LD light sources of F-P types, with a fibre reflector by a part of output light of LD light sources
Signal reflex returns in LD so that occurs in the F-P cavity of LD from relevant effect, finally so that the light of optical pulse generator output
Pulse signal is random polarization, and the output optical signal of the F-P types LD without journey processed above is linearly polarized light.Linear polarization
Light through ordinary optic fibre jump cable be connected to light be polarized/analyzer be polarized when, if optical fiber jump cable deform upon disturbance, the polarizer
Therefore Output optical power will be interfered, P-OTDR work is made to be interfered；And for random polarization, then without the above disadvantage
End.
P-OTDR can measure the variation of each point polarization state on sensor fibre circuit, when certain point on sensor fibre circuit
When flexuosity changes, the polarization state of the point will change, before and after being bent by comparing each point on fibre circuit
Backscatter signal intensity, the changed information of each point flexuosity on fibre circuit can be obtained, to perceive light
Invasion activity on fine fence and invasion position.
This installation cost is low, it is easy to operate, be avoided that between Fibre Optical Sensor active module embedded therein and sensing optic cable that optical fiber jumps cable
The interference of produced disturbance, practicability are good.
Description of the drawings
Fig. 1 is the structural schematic diagram of embodiment.
Specific implementation mode
The utility model content is further elaborated with reference to the accompanying drawings and examples, but is not to the utility model
Restriction.
Embodiment：
Referring to Fig.1, a kind of deformation formula fiber fence device, including P-OTDR modules and a sense light being attached thereto
Cable, the P-OTDR modules include the control unit being linked in sequence, optical pulse generator, 1*2 optical branching devices, cable terminal box
And optical receiver, the external fibre reflector of 1x2 optical branching devices, cable terminal box connect sensing optic cable.
The cable terminal box is equipped with optical directional coupler, light is polarized/analyzer, and the public port of optical directional coupler connects
It connects light and is polarized/analyzer, a port in other two port of optical directional coupler connects light arteries and veins by 1x2 optical branching devices
Generator output end is rushed, another port connects optical receiver input terminal, and light is polarized/analyzer and a light in sensing optic cable
Fibre connection.
Described control unit uses embedded system, and this example is dsp system.
The optical pulse generator is the LD light sources of F-P types.
The optical directional coupler is optical circulator or optical branching device, and this example is optical circulator.
The optical receiver is APD photodetectors or PIN photoelectric detector, and this example is APD photodetectors.
The sensing optic cable is the single mode fiber cable of communication.
The fibre reflector can return to a part of output light signal reflex of LD light sources in the LD light sources of F-P types.
Optical pulse generator output random polarization optical signal through optical directional coupler be output to light be polarized/analyzer in,
Optical signal to the rear is played to be sent in an optical fiber of sensing optic cable；The Rayleigh scattering signal returned from sensor fibre is sent to light
Be polarized/analyzer in, be detected signal to the rear through optical directional coupler, be sent to optical receiver.
Two ports of optical directional coupler are respectively connected to the light arteries and veins of OTDR modules using two ordinary optic fibres jump cables
Rush generator output end, optical receiver input terminal.
Optical pulse generator uses the LD light sources of F-P types, with a fibre reflector by a part of output light of LD light sources
Signal reflex returns in LD so that occurs in the F-P cavity of LD from relevant effect, finally so that the light of optical pulse generator output
Pulse signal is random polarization, and the output optical signal of the F-P types LD without journey processed above is linearly polarized light.Linear polarization
Light through ordinary optic fibre jump cable be connected to light be polarized/analyzer be polarized when, if optical fiber jump cable deform upon disturbance, the polarizer
Therefore Output optical power will be interfered, P-OTDR work is made to be interfered；And for random polarization, then without the above disadvantage
End.
P-OTDR can measure the variation of each point polarization state on sensor fibre circuit, when certain point on sensor fibre circuit
When flexuosity changes, the polarization state of the point will change, before and after being bent by comparing each point on fibre circuit
Backscatter signal intensity, the changed information of each point flexuosity on fibre circuit can be obtained, to perceive light
Invasion activity on fine fence and invasion position.
Claims (5)
1. a kind of deformation formula fiber fence device, characterized in that including P-OTDR modules and a sense light being attached thereto
Cable, the P-OTDR modules include the control unit being linked in sequence, optical pulse generator, 1x2 optical branching devices, cable terminal box
And optical receiver, the external fibre reflector of 1x2 optical branching devices, cable terminal box connect sensing optic cable, the cable terminal box is set
There are optical directional coupler, light to be polarized/analyzer, the public port connection light of optical directional coupler is polarized/analyzer, light direction coupling
A port in other two port of clutch connects optical pulse generator output end, another end by 1x2 optical branching devices
Mouthful connection optical receiver input terminal, light is polarized/and analyzer connect with an optical fiber in sensing optic cable.
2. according to deformation formula fiber fence device described in claim 1, characterized in that the optical pulse generator is F-P types
LD light sources.
3. according to deformation formula fiber fence device described in claim 1, characterized in that the optical directional coupler is optical circulator
Or optical branching device.
4. deformation formula fiber fence device according to claim 1, characterized in that the optical receiver is visited for APD photoelectricity
Survey device or PIN photoelectric detector.
5. deformation formula fiber fence device according to claim 1, characterized in that the sensing optic cable is the list of communication
Mould optical cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721009364.1U CN207624123U (en) | 2017-08-14 | 2017-08-14 | A kind of deformation formula fiber fence device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721009364.1U CN207624123U (en) | 2017-08-14 | 2017-08-14 | A kind of deformation formula fiber fence device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207624123U true CN207624123U (en) | 2018-07-17 |
Family
ID=62819045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721009364.1U Active CN207624123U (en) | 2017-08-14 | 2017-08-14 | A kind of deformation formula fiber fence device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107369281A (en) * | 2017-08-14 | 2017-11-21 | 桂林聚联科技有限公司 | A kind of deformation formula fiber fence device |
| CN109323712A (en) * | 2018-12-04 | 2019-02-12 | 桂林聚联科技有限公司 | A kind of random polarization light source |
-
2017
- 2017-08-14 CN CN201721009364.1U patent/CN207624123U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107369281A (en) * | 2017-08-14 | 2017-11-21 | 桂林聚联科技有限公司 | A kind of deformation formula fiber fence device |
| CN109323712A (en) * | 2018-12-04 | 2019-02-12 | 桂林聚联科技有限公司 | A kind of random polarization light source |
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