CN209676237U - Buried cable fault locating system of the breaking point detection in conjunction with vibration detection - Google Patents
Buried cable fault locating system of the breaking point detection in conjunction with vibration detection Download PDFInfo
- Publication number
- CN209676237U CN209676237U CN201920755735.3U CN201920755735U CN209676237U CN 209676237 U CN209676237 U CN 209676237U CN 201920755735 U CN201920755735 U CN 201920755735U CN 209676237 U CN209676237 U CN 209676237U
- Authority
- CN
- China
- Prior art keywords
- laser
- photoswitch
- circulator
- acousto
- buried cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Locating Faults (AREA)
Abstract
The utility model relates to a kind of photoelectric detecting systems, more particularly to a kind of buried cable fault locating system of breaking point detection in conjunction with vibration detection, including distributed feedback laser, narrow band laser, photoswitch, acousto-optic modulator, driver, circulator, tested buried cable, photodetector, capture card and computer；The utility model has the following beneficial effects: being multiplexed optical time domain reflection measuring technology and phase sensitive optical time domain reflection measuring technology in fault points of optical cables position measurement；According to the sequence that Cable's Fault point location, optic cable vibration position position, the ground location being overlapped by finding ground beating position and position of failure point realizes the positioning of buried cable fault point.
Description
Technical field
The utility model relates to a kind of photoelectric detecting systems, and in particular to a kind of breaking point detection burying in conjunction with vibration detection
Ground Cable's Fault point positioning system.
Background technique
Optical fiber communication technology is to transmit to realize based on laser, and laser transmission needs optical cable as carrier, the on-off of optical cable
Influence the normal transmission of optical-fibre communications information.With the development of optical fiber communication technology, more and more optical cable layings in subsurface,
And the mileage being laid with is increasingly longer, causes engineering staff more and more difficult when determining fault points of optical cables position, once optical cable is sent out
Raw failure, generally requires the position for spending a large amount of financial resources and energy to look for fault point, so that the first-aid repair efficiency of Cable's Fault
It is difficult to ensure, and financial resources and manpower cost are more, be based on this reason, people need one kind that engineering staff can be helped quickly fixed
The instrument of position fault points of optical cables.
The optical time domain reflection measuring technology of detecting optical cable distance comparative maturity at present, can be surveyed by this technology
The return loss for trying transmission laser in optical fiber measures the length of optical cable, or distance of the measurement fault point on optical cable with this.This
Kind technical application can only measure distance of the fault points of optical cables on optical cable, can not obtain light in buried cable failure point detecting
The position of cable fault point on the ground needs to be superimposed other technologies to measure the ground location of buried cable fault point.
In the ground location measuring technique of buried cable fault point, phase sensitive optical time domain reflection measuring technology is also answered
With phase sensitive optical time domain reflection test macro interventional procedures more than optical time domain reflection test macro.System sends out laser
Raw interference, when interference light is propagated in a fiber, the size of interference light intensity can be with the mechanical periodicity of interference light phase and the period becomes
Change, when optical fiber is in stable condition, Phase Changing is also stable, but when optical fiber vibrates, and phase change will be because
To vibrate without stopping changing, people can understand the relationship between vibration position and fiber position in phase perturbation.But
It is difficult to find the position of breakpoints of optical fiber using phase sensitive optical time domain reflection measuring technology merely, because phase sensitive optical time domain is anti-
The position that breakpoints of optical fiber can not be accurately positioned in measuring technology is penetrated, even if being aware of between ground vibration position and fiber position
Relationship can not also know where be breakpoint.
At present in the detection technique of buried cable fault point, national inventing patent " is accurately positioned using the artificial failure of optical cable
Lightguide cable link fault point " (ZL201210522693.1) measures fault point on optical cable firstly the need of using optical time domain reflection survey meter
Position, then compare cable runs figure, find the Position Approximate of breakpoints of optical fiber, then hand excavation's optical cable again, little by little try
It visits ground and finds fiber failure point.This method needs cable runs figure and can compare, and is difficult to look for if without cable runs figure
To the specific location of fault point, and based on the only Position Approximate of fault point on the ground that this method detects, pass through people
Work excavation go a little trouble-shooting point be extremely waste time, man power and material.
In the detection technique of buried cable fault point, national inventing patent application " buried communication cable abort situation
Face accurate positioning device and method " (publication date: 2018.06.15) and a kind of " the pinpoint vibration in buried cable failure ground
Test device " (publication date: 2018.09.07) is using phase sensitive optical time domain reflection survey meter come detecting optical cable fault point: first
First passing through constantly percussion ground makes buried cable generate vibration, recycles the vibration of phase sensitive optical time domain reflection survey meter detecting optical cable
Dynamic state finds the position where fault points of optical cables, and this detection method is in the feelings for not knowing fault points of optical cables Position Approximate
Under condition, need to tap the Position Approximate for finding fault points of optical cables constantly on lightguide cable link, this process is also when extremely wasting
Between, man power and material.
Utility model content
For above-mentioned disadvantage of the existing technology, the utility model proposes a kind of breaking point detections in conjunction with vibration detection
Buried cable fault point detection system first passes through the Position Approximate that optical time domain reflection Detection Techniques find fault points of optical cables, then
Pass through phase sensitivity optical time domain reflection Detection Techniques near this Position Approximate again and find more accurate fault points of optical cables, greatly
Improve the detection efficient of fault point.
A kind of the technical solution adopted in the utility model are as follows: the buried cable fault point of breaking point detection in conjunction with vibration detection
Detection system, the system combine optical time domain reflection measuring technology and phase sensitive optical time domain reflection measuring technology, including point
Cloth feedback laser 1, narrow band laser 2, photoswitch 3, acousto-optic modulator 4, driver 5, circulator 6, tested buried cable
7, photodetector 8, capture card 9 and computer 10.Distributed feedback laser 1 and narrow band laser 2 simultaneously by optical fiber with
Photoswitch 3 connects, and photoswitch 3 connect by optical fiber with the fiber port 401 of acousto-optic modulator 4, driver 5 pass through signal wire and
The signal port 402 of acousto-optic modulator 4 connects, and the output port 403 of acousto-optic modulator 4 passes through optical fiber and the first of circulator 6
Port 601 connects, and the second port 602 of circulator 6 connects tested buried cable 7, and the third port 603 of circulator 6 passes through light
Fibre is connect with the input port of photodetector 8, and the output port of photodetector 8 is connect with capture card 9, and capture card 9 connects again
It is connected on computer 10.
Distributed feedback laser 1 is the laser of built-in fiber Bragg grating, for emitting laser, to realize system
Optical time domain reflection test.
Narrow band laser 2 is used to emit laser, and with the laser of the transmitting of distributed feedback laser 1 in same frequency range,
But narrow band laser 2 is compared with distributed feedback laser 1, and the laser frequency band of narrow band laser transmitting is narrower, is easy to happen dry
It relates to, is used for the test of phase sensitive optical time domain reflection.
Photoswitch 3 is for selecting laser light source.Photoswitch 3 can choose the laser for allowing distributed feedback laser 1 to issue
Pass through, also can choose the laser for allowing narrow band laser 2 to issue and pass through, when the selection of photoswitch 3 allows distributed feedback laser 1 to send out
When laser out passes through, system works in optical time domain reflection test pattern.When the selection of photoswitch 3 allows narrow band laser 2 to issue
When laser passes through, system works in phase sensitive optical time domain reflection test pattern.
For acousto-optic modulator 4 for modulating laser, it will become pulse laser from the modulation of the continuous laser of photoswitch 3, it
Pulse laser is sent to circulator 6 afterwards.
Driver 5 is used to send modulated signal, the modulation that acousto-optic modulator 4 is issued according to driver 5 to acousto-optic modulator 4
Signal is modulated laser.
The laser that circulator 6 is sent after first modulating acousto-optic modulator 4 is sent to tested buried cable 7, then again will
The tested reflected laser of buried cable 7 is sent to photodetector 8.Pulse laser is in tested buried cable due to Rayleigh
Scattering can have a part of return light, and return light enters in photodetector 8 using circulator 6.
Photodetector 8 is used to convert the optical signal that circulator 6 is sent to electric signal, then this part electric signal is sent
To capture card 9.
After capture card 9 acquires the electric signal of the transmission of photodetector 8, collected electric signal is sent to computer
10, then signal analysis and processing is carried out by computer 10.
The utility model also provides a kind of buried cable fault point positioning method based on system above, including following step
It is rapid:
S1 is by tested 7 access system of buried cable.
S2 carries out optical time domain reflection test and measures 7 fault point of tested optical fiber using the optical time domain reflection test function of system
Position Approximate, specifically includes the following steps:
S2.1 distributed feedback laser 1 sends laser to photoswitch 3.
S2.2 laser reaches the fiber port 401 of acousto-optic modulator 4 by photoswitch 3, and acousto-optic modulator 4 is by Laser Modulation
For pulse laser, exported from output port 403.
S2.3 pulse laser reaches the first port 601 of circulator 6, exports from the second port 602 of circulator 6, enters
Tested buried cable 7.
Rayleigh scattering can occur for laser of the S2.4 transmission in tested buried cable 7, wherein that portion scattered to dead astern
The second port 602 of light input circulator 6 is penetrated in dispersion, is exported from the third port 603 of circulator 6.
The Rayleigh scattering light that S2.5 is exported from the third port 603 of circulator 6 inputs photodetector 8, by photodetection
Device 8 is converted into corresponding electric signal.
The electric signal that S2.6 photodetector 8 exports inputs capture card 9, is acquired by capture card 9.
Collected electric signal is sent to computer 10 by S2.7 capture card 9, and computer 10 handles signal, calculates tested
The Position Approximate of 7 fault point of optical fiber.
S3 carries out the test of phase sensitive optical time domain reflection, uses the phase sensitive optical time domain reflection test function of system, In
The fault point Position Approximate that S2 is measured nearby taps ground, and obtains the vibration-testing data measured by optic cable vibration, specifically
The following steps are included:
S3.1 narrow band laser 2 sends laser to photoswitch 3.
S3.2 laser reaches the fiber port 401 of acousto-optic modulator 4 by photoswitch 3, and acousto-optic modulator 4 is by Laser Modulation
For pulse laser, exported from output port 403.
S3.3 pulse laser reaches the first port 601 of circulator 6, exports from the second port 602 of circulator 6, enters
Tested buried cable 7.
The back rayleigh scattering light that laser of the S3.4 transmission in tested buried cable 7 generates interferes to be formed with phase
The back rayleigh scattering light of position information, the second port 602 of the back rayleigh scattering light input circulator 6 with phase information,
It is exported from the third port 603 of circulator 6.
The back rayleigh scattering light input photoelectricity with phase information that S3.5 is exported from the third port 603 of circulator 6
Detector 8 is converted into corresponding electric signal by photodetector 8.
The electric signal that S3.6 photodetector 8 exports inputs capture card 9, is acquired by capture card 9.
Collected signal is sent to computer 10 by S3.7 capture card 9, and computer 10 handles signal, is obtained with phase
The feedback signal of information, extraneous vibration information are just embodied in feedback signal.
S4 data processing and analytical judgment, the feedback signal with phase information obtained according to S3, analysis beating point are
No is the fault point of optical cable, and S5 is carried out when not being fault point, S6 is carried out when being fault point.
S5 mobile test position when not being fault point, carries out mobile test, mobile to the direction of fault points of optical cables position,
Repeat S3 and S4.
The ground S6 is excavated, and ground is then excavated when being fault point, finds out the fault point on optical cable.
The utility model has the following beneficial effects:
1, optical time domain reflection measuring technology and phase sensitive optical time domain reflection have been multiplexed in fault points of optical cables position measurement
Measuring technology；
2, the sequence positioned according to Cable's Fault point location, optic cable vibration position, by finding ground beating position and event
The ground location that barrier point position is overlapped, realizes the positioning of buried cable fault point.
Detailed description of the invention
Fig. 1 is the knot of buried cable fault locating system of the breaking point detection described in the utility model in conjunction with vibration detection
Structure schematic diagram；
Fig. 2 is a kind of implementation flow chart of buried cable fault point positioning method based on positioning system shown in Fig. 1；
Fig. 3 is to carry out the waveform that fault point is tested using positioning system shown in Fig. 1.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing.
Buried cable fault locating system of the breaking point detection described in the utility model in conjunction with vibration detection has been multiplexed light
Time Domain Reflectometry measuring technology and phase sensitive optical time domain reflection measuring technology.
When photoswitch 3 selects distributed feedback laser 1 as light source, system is in optical time domain reflection test mode.
The continuous laser that distributed feedback laser 1 issues after photoswitch 3, adjusted by acousto-optic modulator 4 by continuous laser
Pulse laser is made, pulse laser enters in tested optical fiber 7 using circulator 6.
When propagating in tested optical fiber 7 Rayleigh scattering can occur for laser, wherein the part scattered to dead astern scatters light
Circulator 6 is returned again to, this part return light is transmitted further to photodetector 8 through circulator, and the transmitting and return of pulse laser exist
Be on time it is separated, realize the distributed measurement to optical fiber.
The optical signal received is converted electric signal by photodetector 8, then electric signal is sent to capture card 9, acquisition
Collected signal is sent to computer 10 by card 9, and signal is analyzed and processed and is shown by computer 10.
When laser is propagated in tested optical fiber 7, nearby the power of fiber Rayleigh scattering return light is greater than distant place fiber Rayleigh
Scatter return light power, this be laser propagation loss caused by, in software it can be seen that one with fiber distance increase and
The signal curve gradually decayed.
And in fiber failure point, laser can form the very big reflected light of power by fault point fault plane reflection, soft in computer
It can be observed that signal will appear a peak value on part, reflection end can be calculated according to the position of reflection peak in signal waveform
Distance of the face on optical fiber.
When photoswitch 3 selects narrow band laser 2 as light source, system is in phase sensitive optical time domain reflection test shape
State.The laser that narrow band laser 2 issues can also be propagated in tested optical fiber 7 and return to Rayleigh scattering light.
Due to the narrower bandwidth of narrow band laser 2, according to fiber optic interferometric rule it is found that the laser that narrow band laser 2 issues
It when propagating in tested optical fiber 7, is easier to interfere between the Rayleigh scattering return light of generation, forms subsidiary phase information
Interference light, it will be seen that being attached to the return interference waveform of phase information in the software of computer 10.
When tested optical fiber 7 is in stable state, the light path of tested optical fiber 7 is stable, the phase of the interference light of return
And it is stable, it will be seen that stable interference waveform in the software of computer 10.When extraneous vibration produces tested optical fiber 7
When raw disturbance, the light path of tested optical fiber 7 can constantly change, and the phase of interference light also can constantly change, in the soft of computer 10
It will be appreciated that the interference waveform constantly beated can calculate oscillation point and fiber failure according to the position that waveform is beated in part
Relationship between point position.
After obtaining fiber failure point position and fiber-optic vibration position, engineering staff can be by tapping ground judgement
Relationship between ground beating point and fiber failure point position, vibration position and fault point caused by engineering staff taps ground
Position on waveform when coinciding, so that it may determine that Current terrestrial beating point is the ground location of fiber failure point.
Fig. 3 is that the waveform that fault point is tested is carried out using positioning system shown in Fig. 1, and the curve of top is phase sensitivity in figure
The optic cable vibration curve that optical time domain reflection is tested, the amplitude of curve represents the size of optic cable vibration in figure, on optical cable
The ground of side taps, and the profile amplitude of beating point can be made to go up on a large scale.The curve of lower section is that optical time domain reflection is tested in figure
The spike of the failure point curve arrived, curve is exactly the position of fault point, and in this width test chart, spike is located approximately at 38km, is said
The fault point of Mingguang City's cable is located at the position of 38km or so on optical cable.
Claims (2)
1. a kind of buried cable fault locating system of breaking point detection in conjunction with vibration detection, it is characterised in that: including distribution
Formula feedback laser (1), narrow band laser (2), photoswitch (3), acousto-optic modulator (4), driver (5), circulator (6), quilt
Survey buried cable (7), photodetector (8), capture card (9) and computer (10)；Distributed feedback laser (1) and narrowband swash
Light device (2) is connect by optical fiber with photoswitch (3) simultaneously, and photoswitch (3) passes through the fiber port of optical fiber and acousto-optic modulator (4)
(401) it connects, driver (5) is connect by signal wire with the signal port (402) of acousto-optic modulator (4), acousto-optic modulator (4)
Output port (403) connect with the first port (601) of circulator (6) by optical fiber, the second port of circulator (6)
(602) it connects tested buried cable (7), the third port (603) of circulator (6) is defeated by optical fiber and photodetector (8)
Inbound port connection, the output port of photodetector (8) are connect with capture card (9), and capture card (9) is connected to computer (10)
On；
Distributed feedback laser (1) is for emitting laser, to realize the optical time domain reflection test of system；
Narrow band laser (2) is used to emit laser, and with the laser of distributed feedback laser (1) transmitting in same frequency range,
But narrow band laser (2) is compared with distributed feedback laser (1), and the laser frequency band of narrow band laser transmitting is narrower, is easy hair
Raw interference is used for the test of phase sensitive optical time domain reflection；
For photoswitch (3) for selecting laser light source, photoswitch (3) can choose swashing of allowing distributed feedback laser () 1 to issue
Light passes through, and also can choose the laser for allowing narrow band laser (2) to issue and passes through, and when photoswitch (3), selection allows distributed Feedback to swash
When the laser that light device (1) issues passes through, system works in optical time domain reflection test pattern；When photoswitch (3), selection allows narrowband to swash
When the laser that light device (2) issues passes through, system works in phase sensitive optical time domain reflection test pattern；
For acousto-optic modulator (4) for modulating laser, it will become pulse laser from the continuous laser modulation of photoswitch (3), it
Pulse laser is sent to circulator (6) afterwards；
Driver (5) is used to send modulated signal to acousto-optic modulator (4), and acousto-optic modulator (4) is issued according to driver (5)
Modulated signal is modulated laser；
The laser sent after acousto-optic modulator (4) modulation is sent to tested buried cable (7) first by circulator (6), then again
Tested buried cable (7) reflected laser is sent to photodetector (8)；
Photodetector (8) is used to convert the optical signal that circulator (6) are sent to electric signal, then this part electric signal is sent
Give capture card (9)；
After capture card (9) acquires the electric signal of photodetector (8) transmission, collected electric signal is sent to computer
(10), then by computer (10) signal analysis and processing is carried out.
2. a kind of buried cable fault locating system of the breaking point detection in conjunction with vibration detection according to claim 1,
Be characterized in that: distributed feedback laser (1) is the laser of built-in fiber Bragg grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755735.3U CN209676237U (en) | 2019-05-24 | 2019-05-24 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755735.3U CN209676237U (en) | 2019-05-24 | 2019-05-24 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209676237U true CN209676237U (en) | 2019-11-22 |
Family
ID=68575465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920755735.3U Active CN209676237U (en) | 2019-05-24 | 2019-05-24 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209676237U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011728A (en) * | 2019-05-24 | 2019-07-12 | 昆仑杰信（北京）科技有限责任公司 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
| CN111289222A (en) * | 2020-01-21 | 2020-06-16 | 丽水正阳电力建设有限公司 | Optical fiber breakpoint monitoring device based on phase-sensitive optical time domain reflection technology |
| CN111397849A (en) * | 2020-04-20 | 2020-07-10 | 深圳市特发信息股份有限公司 | Optical fiber damage monitoring system by analyzing various environment vibration signals |
-
2019
- 2019-05-24 CN CN201920755735.3U patent/CN209676237U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011728A (en) * | 2019-05-24 | 2019-07-12 | 昆仑杰信（北京）科技有限责任公司 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
| CN111289222A (en) * | 2020-01-21 | 2020-06-16 | 丽水正阳电力建设有限公司 | Optical fiber breakpoint monitoring device based on phase-sensitive optical time domain reflection technology |
| CN111397849A (en) * | 2020-04-20 | 2020-07-10 | 深圳市特发信息股份有限公司 | Optical fiber damage monitoring system by analyzing various environment vibration signals |
| CN111397849B (en) * | 2020-04-20 | 2021-08-06 | 深圳市特发信息股份有限公司 | Optical fiber damage monitoring system by analyzing various environment vibration signals |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110011728A (en) | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection | |
| KR101397775B1 (en) | Evaluating the position of a time-varying disturbance | |
| CN209676237U (en) | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection | |
| CN113405577B (en) | Measuring method and measuring device | |
| CN105509868B (en) | Phase sensitive optical time domain reflection distributed fiber-optic sensor system phase calculation method | |
| US10634551B2 (en) | Reflectometric vibration measurement system and relative method for monitoring multiphase flows | |
| CN207036249U (en) | A kind of highly sensitive distributed optical fiber vibration sensing system | |
| CN109120335A (en) | A kind of buried cable failure terrestrial positioning instrument and localization method | |
| CN102645268A (en) | Optical frequency division multiplexing phase-sensitive optical time domain reflectometer | |
| CN102739311A (en) | Chaotic visible laser-based optical fiber fault positioning device and positioning method thereof | |
| CN101393268A (en) | Earthquake early-warning system based on communication optical cable | |
| CN206440242U (en) | A kind of distributed displacement transducer based on BOTDA and fixed point strain optical cable | |
| US20240060852A1 (en) | Fiber optic cable location system and method | |
| CN107238412A (en) | It is a kind of while monitoring vibration, stress, the distributed fiberoptic sensor of temperature | |
| CN101393269A (en) | Method for monitoring geology by utilizing communication optical cable | |
| CN109595470A (en) | A kind of distributed pipeline detection method and system | |
| CN103278271A (en) | Distributed optical fiber monitoring system and monitoring method thereof | |
| CN101465052A (en) | Safety monitoring system and method for circumference | |
| CN106612146A (en) | System for rapidly finding and precisely positioning ground position of fault point of communication optical fiber | |
| JP3147616B2 (en) | Distributed waveguide sensor | |
| CN110518969A (en) | A kind of positioning device and method of optic cable vibration | |
| CN109991511A (en) | A kind of overhead transmission line lightning stroke monitoring device and monitoring method | |
| CN103439630A (en) | Power cable fault point positioning method and system | |
| CN101324446B (en) | Destabilization sensing localization method | |
| CN112629821B (en) | Method and device for determining optical cable position, electronic equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |