CN106644398A - Submarine optical cable fault point positioning method - Google Patents
Submarine optical cable fault point positioning method Download PDFInfo
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- CN106644398A CN106644398A CN201611265326.2A CN201611265326A CN106644398A CN 106644398 A CN106644398 A CN 106644398A CN 201611265326 A CN201611265326 A CN 201611265326A CN 106644398 A CN106644398 A CN 106644398A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
Abstract
The invention discloses a submarine optical cable fault point positioning method comprising the following steps: in step S01, preliminary detection signals are obtained, and the preliminary detection signals have strong reflected light at a fault point; in step S02, first space distance of the fault point relative to an optical time domain reflecting device is obtained according to the preliminary detection signals; in step S03, a vibration point is chosen, the vibration point near the fault point is chosen for vibrating an optical cable, and second detection signals that are received by the optical time domain reflecting device when the optical cable vibrates are recorded; in step S04, the vibration point is positioned and the fault point is updated, second space distance of the vibration point relative to the fault point is obtained according to the second detection signals and the preliminary detection signals, and the position of the fault point is updated according to the second space distance; in step S05, whether vibration point signals are submerged by fault point signals is determined, positioning operation is completed when the vibration point signals are submerged, otherwise step S03 is repeated to enable a new vibration point to be close to the fault point. According to the method disclosed in the invention, a submarine optical cable only needs to be vibrated at a plurality of vibration points, no physical damage such as bending torsion and the like can be caused to the optical cable, and high feasibility can be realized.
Description
Technical field
The present invention relates to optical cable applied technical field, more particularly to a kind of submarine optical fiber cable fault point positioning method.
Background technology
In recent years, with the attention of China's marine field, marine industries are fast-developing, related communication facility such as Submarine Optical
The construction scale of cable also gradually expands.However, frequently ship operation and seabed engineering form threat, Er Qiehai to coastal waters optical cable
Base ring border is complicated, and earthquake takes place frequently, so extra large cable failure accident possibility is also being continuously increased, to national economy and national defense construction band
Carry out massive losses.Therefore, the fault location of submarine optical fiber cable and maintenance are it is critical that problem.
Existing land optic cable FLT is mainly based upon the OTDR of backward Rayleigh scattering loss detection, and (optical time domain is anti-
Penetrate instrument) technology, this mode has the advantages such as low cost, device simple, event of failure discriminating power be strong, measuring distance is remote, by
It is not specific position of failure point in the fiber lengths of the simply trouble point of OTDR measurements, and there is strand contracting in optical cable, therefore need
Particular location is found out according to optical cable construction figure.But in seabed, because underwater environment is complicated, optical cable laying position is failed to understand,
It is difficult to find concrete position of failure point according to trouble point fiber lengths, and OTDR technique to there is positioning precision low, time-consuming
Shortcoming, localization of fault it is inaccurate can cause fiber optic cable maintenance expense increase severely, accordingly, it would be desirable to improve fault location skill
Art.
Have at present a kind of Cable's Fault location technology based on Raman scattering and Brillouin scattering be based on heating (or strain
Effect) method, this method realized progressively by the phase position of measurement plus warm spot (or effects of strain point) and trouble point
Approach, be greatly improved fault location precision.However, to optical cable heating operating difficulties under marine environment, difficulty of construction is very big,
Extra large cable armor is solid, and strain is difficult to be applied in optical fiber, therefore, it is this based on Raman scattering and the fault location of Brillouin scattering
Method is difficult to be applied in actual marine environment.
The content of the invention
In view of the deficiency that prior art is present, the invention provides a kind of submarine optical fiber cable fault point positioning method, can be used for
The fault location of submarine optical fiber cable, simple to operate and high precision.
In order to realize above-mentioned purpose, following technical scheme is present invention employs：
A kind of submarine optical fiber cable fault point positioning method, including：
S01, the preliminary detectable signal of acquisition：Start optical time domain reflecting device to send pulsed light, it is preliminary that acquisition is reflected back
Detectable signal, the preliminary detectable signal has strong reflection in trouble point；
S02, trouble point Primary Location：Trouble point is obtained relative to the of optical time domain reflecting device according to preliminary detectable signal
One space length；
S03, selection oscillation point：As oscillation point and optical cable is vibrated at trouble point selected around, record optic cable vibration
When the quadratic probing signal that receives of optical time domain reflecting device, wherein, the oscillation point the optical time domain reflecting device with it is described
Between trouble point；
S04, vibration point location and trouble point update：Oscillation point phase is obtained according to quadratic probing signal and preliminary detectable signal
For the second space distance of trouble point, and position of failure point is updated accordingly；
S05, judge whether oscillation point signal is submerged in the signal of trouble point, if oscillation point signal is submerged, position
Complete, oscillation point is identical with position of failure point；Otherwise, repeat step S03, makes new oscillation point closer to trouble point.
Used as one of which embodiment, the optical time domain reflecting device is φ-OTDR reflectometers.
Used as one of which embodiment, the optical time domain reflecting device can also be C-OTDR reflectometers.
Used as one of which embodiment, the mode for vibrating optical cable is by salvaging vibration optical cable.
Used as one of which embodiment, in step S05, new oscillation point is by between oscillation point and the trouble point
Two parts ratio for being divided into of optical cable be 7:1-10:1.
Used as one of which embodiment, in step S05, new oscillation point is by between oscillation point and the trouble point
Two parts ratio for being divided into of optical cable be 9:1.
Used as one of which embodiment, step S02 includes：
S021, show that between trouble point and optical time domain reflecting device first is fine long according to preliminary detectable signal；
S022, twisted between shrinkage and the construction drawing localization of faults and optical time domain reflecting device according to first fine long, optical cable
First space length, wherein, the construction drawing is used to determine optical cable bending, circuitous length.
Used as one of which embodiment, step S04 includes：
S041, correction quadratic probing signal：Contrast quadratic probing signal and the position of trouble point in preliminary detectable signal, obtain
Go out the linear measure longimetry deviation value of optical time domain reflecting device, and quadratic probing signal translated according to linear measure longimetry deviation value,
Make the position consistency of the trouble point in the position of quadratic probing signal fault point and preliminary detectable signal；
Quadratic probing signal after S042, translation deducts preliminary detectable signal, draws the between trouble point and oscillation point
Two is fine long；
S043, shrinkage and the second space between the construction drawing localization of faults and oscillation point are twisted according to second fine long, optical cable
Distance and orientation；
S044, according between trouble point and oscillation point second space distance and the anti-position for pushing away and updating trouble point in orientation
Put.
The present invention is based on Rayleigh scattering phase-sensitive optical time domain reflection technology or coherent light time domain reflection technology, by people
The signal that work vibration submarine optical fiber cable is produced combines absolute fix realizing the relative positioning of trouble point, only need to be in multiple vibrations
Point vibration submarine optical fiber cable, makes oscillation point Step wise approximation trouble point to realize the positioning of trouble point, will not produce bending to optical cable and turn round
Turn to wait physics sexual abuse, simple to operate, feasibility is high.
Description of the drawings
Fig. 1 is the submarine optical fiber cable localization of fault model schematic of the embodiment of the present invention；
Fig. 2 is the submarine optical fiber cable localization of fault process schematic of the embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further described.It should be appreciated that specific embodiment described herein is only to explain the present invention, and without
It is of the invention in limiting.
Refering to Fig. 1, during the submarine optical fiber cable localization of fault of the embodiment of the present invention, only need to be in one end linker of submarine optical fiber cable
Send pulsed light as optical time domain reflecting device 1 and receive reflection in phase-sensitive (φ-OTDR) reflectometer of Rayleigh scattering
Signal, pulsed light is in trouble point A0Strong reflection is produced, reflected signal is detected by φ-OTDR technique, obtained the external world and disturb
Dynamic information and trouble point reflective information, by analyzing trouble point A0The transmission time of reflected signal can be to trouble point A0Carry out just
Step positioning, obtains trouble point A0Fibre apart from optical time domain reflecting device 1 is long, calculates its approximate spatial locations；When anti-in optical time domain
The place end of injection device 1 and trouble point A0Between somewhere salvage submarine optical fiber cable when, during salvaging produce certain amplitude vibration
Signal, is detected by φ-OTDR technique to reflected signal, obtains external disturbance information, trouble point reflective information and salvaging
The vibration information of point.The optical time domain reflecting device 1 can also be C-OTDR reflectometers.
Based on this principle, with reference to shown in Fig. 2, the submarine optical fiber cable fault point positioning method of the present embodiment includes：
S01, the preliminary detectable signal p of acquisition：Start optical time domain reflecting device to send pulsed light, it is preliminary that acquisition is reflected back
Detectable signal p, preliminary detectable signal p is in trouble point A0There is strong reflection；
S02, trouble point Primary Location：Trouble point A is obtained according to preliminary detectable signal p0Relative to optical time domain reflecting device
The first space length L；
S03, selection oscillation point An：In trouble point A0As oscillation point A at selected around onenAnd optical cable is vibrated, record optical cable
The quadratic probing signal q that optical time domain reflecting device is received during vibration, wherein, oscillation point AnIn optical time domain reflecting device and trouble point
A0Between；
S04, vibration point location and trouble point A0Update：Vibration is obtained according to quadratic probing signal q and preliminary detectable signal p
Point AnRelative to trouble point A0Second space apart from Ln, and trouble point A is updated accordingly0Position；
S05, judge oscillation point AnWhether signal is submerged in trouble point A0In signal, if oscillation point AnSignal is submerged, then
Positioning is completed, oscillation point AnWith trouble point A0Position is identical；Otherwise, repeat step S03, updates oscillation point, makes new oscillation point more
Near trouble point A0。
In the present embodiment, during concrete operations, the mode for vibrating optical cable is by salvaging optical cable so as to produce certain amplitude
Vibration.In step S05, new oscillation point is by a front oscillation point AnWith trouble point A0Between two parts ratio for being divided into of optical cable
For 7:1-10:1, the preferably ratio is 9:1, oscillation point A can be madenClose trouble point A quickly0。
Step S02 is specifically included：
S021, drawn according to preliminary detectable signal p and obtain trouble point A0Between optical time domain reflecting device first is fine long
a0；
S022, shrinkage and construction drawing localization of faults A are twisted according to the first fine long a0, optical cable0With optical time domain reflecting device it
Between the first space length L, wherein, construction drawing be used for determine optical cable bending, circuitous length.
Step S04 is specifically included：
S041, correction quadratic probing signal q：Trouble point A in contrast quadratic probing signal q and preliminary detectable signal p0Position
Put, draw the linear measure longimetry deviation value d of optical time domain reflecting device, and quadratic probing signal q is entered according to linear measure longimetry deviation value d
Row translation, makes quadratic probing signal q trouble point A0Position and preliminary detectable signal p in trouble point A0Position consistency；
Quadratic probing signal q after S042, translation deducts preliminary detectable signal p, draws trouble point A0With oscillation point AnBetween
The second fine long ln；
S043, according to the second fine long ln, optical cable twist shrinkage and construction drawing localization of faults A0With oscillation point AnBetween second
Space length LnAnd orientation；
S044, according to trouble point A0With oscillation point AnBetween second space apart from LnAnd orientation is counter pushes away and update trouble point
A0Position.
In step S042, trouble point A is drawn0With oscillation point AnBetween the second fine long lnPrinciple be：It is secondary after translation
Detectable signal q is deducted after preliminary detectable signal p, calculates the distance between the strong reflection peak crest nearest with it poor, range difference
It is multiplied with the light velocity v in optical cable for the time difference between the strong reflection peak crest nearest with its, and divided by 2, the range difference is
Second fine long ln。
When in the reflected signal that φ-OTDR are received, vibration signal position AnTrouble point A is submerged in completely0When in signal, i.e.,
It is believed that oscillation point AnPosition substantially with trouble point A0Overlap, now, localization of fault is completed, last oscillation point AnPosition
As trouble point A0Position.
This programme compared with traditional Brillouin OTDR FLTs, at least with two advantages：
First, the program is detected by artificial vibration signal, simple in operation, only need to pull submarine optical fiber cable with crowfoot,
Without the need for other equipment and operation, feasibility is high；And traditional Brillouin's OTDR fault location needs to carry out optical cable warming operation, this
Under water enforcement difficulty is very big；
Second, the program will not produce the physics sexual abuses such as flexion torsion to optical cable；And the mode of Brillouin needs to take one
Section optical cable is put into temperature control box, and this has to optical cable and to a certain degree damages；
In sum, the present invention is based on Rayleigh scattering phase-sensitive optical time domain reflection technology or coherent light time domain reflection skill
Art, the signal produced by artificial vibration submarine optical fiber cable combines absolute fix realizing the relative positioning of trouble point, only need to be
Multiple oscillation points vibrate submarine optical fiber cable, make oscillation point Step wise approximation trouble point to realize the positioning of trouble point, and optical cable will not be produced
The physics sexual abuses such as raw flexion torsion, simple to operate, feasibility is high.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the application principle, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (8)
1. a kind of submarine optical fiber cable fault point positioning method, it is characterised in that include：
S01, the preliminary detectable signal (p) of acquisition：Start optical time domain reflecting device to send pulsed light, obtain the preliminary spy being reflected back
Signal (p) is surveyed, the preliminary detectable signal (p) is in trouble point (A0) there is strong reflection；
S02, trouble point Primary Location：Trouble point (A is obtained according to preliminary detectable signal (p)0) relative to optical time domain reflecting device
First space length (L)；
S03, selection oscillation point (An)：In trouble point (A0) at selected around one as oscillation point (An) and vibrate optical cable, recording light
Quadratic probing signal (q) that optical time domain reflecting device is received when cable vibrates, wherein, the oscillation point (An) anti-in the optical time domain
Injection device and the trouble point (A0) between；
S04, vibration point location and trouble point update：Oscillation point is obtained according to quadratic probing signal (q) and preliminary detectable signal (p)
(An) relative to trouble point (A0) second space distance (Ln), and trouble point (A is updated accordingly0) position；
S05, judge oscillation point (An) whether signal be submerged in trouble point (A0) in signal, if oscillation point (An) signal is submerged,
Then positioning is completed, oscillation point (An) and trouble point (A0) position is identical；Otherwise, repeat step S03, make new oscillation point closer to
Trouble point (A0)。
2. submarine optical fiber cable fault point positioning method according to claim 1, it is characterised in that the optical time domain reflecting device
For φ-OTDR reflectometers.
3. submarine optical fiber cable fault point positioning method according to claim 1, it is characterised in that the optical time domain reflecting device
Can also be C-OTDR reflectometers.
4. submarine optical fiber cable fault point positioning method according to claim 1, it is characterised in that the mode of vibration optical cable is logical
Cross salvaging vibration optical cable.
5. submarine optical fiber cable fault point positioning method according to claim 1, it is characterised in that new in step S05
Oscillation point is by oscillation point (An) with the trouble point (A0) between two parts ratio for being divided into of optical cable be 7:1-10:1.
6. submarine optical fiber cable fault point positioning method according to claim 5, it is characterised in that new in step S05
Oscillation point is by oscillation point (An) with the trouble point (A0) between two parts ratio for being divided into of optical cable be 9:1.
7. according to the arbitrary described submarine optical fiber cable fault point positioning method of claim 1-6, it is characterised in that step S02
Including：
S021, trouble point (A is drawn according to preliminary detectable signal (p)0) first fine long (a0) and optical time domain reflecting device between；
S022, shrinkage and the construction drawing localization of faults (A are twisted according to first fine long (a0), optical cable0) and optical time domain reflecting device between
The first space length (L), wherein, the construction drawing be used for determine optical cable bending, circuitous length.
8. submarine optical fiber cable fault point positioning method according to claim 7, it is characterised in that step S04 includes：
S041, correction quadratic probing signal (q)：Contrast quadratic probing signal (q) and trouble point (A in preliminary detectable signal (p)0)
Position, draw linear measure longimetry deviation value (d) of optical time domain reflecting device, and to quadratic probing signal (q) according to linear measure longimetry
Deviation value (d) is translated, and makes quadratic probing signal (q) trouble point (A0) position and preliminary detectable signal (p) in failure
Point (A0) position consistency；
Quadratic probing signal (q) after S042, translation deducts preliminary detectable signal (p), draws trouble point (A0) and oscillation point (An)
Between the second fine long (ln)；
S043, according to the second fine long (ln), optical cable twist shrinkage and the construction drawing localization of faults (A0) and oscillation point (An) between
Two space length (Ln) and orientation；
S044, according to trouble point (A0) and oscillation point (An) between second space distance (Ln) and orientation is counter pushes away and update failure
Point (A0) position.
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| CN107391844A (en) * | 2017-07-21 | 2017-11-24 | 深圳市置辰海信科技有限公司 | Extra large cable operation construction period Dynamic calculation method |
| CN108519216A (en) * | 2018-04-12 | 2018-09-11 | 金帆智华（北京）科技有限公司 | A kind of optical cable recognition methods based on ground surface vibration frequency |
| CN109120335A (en) * | 2018-09-26 | 2019-01-01 | 昆仑杰信（北京）科技有限责任公司 | A kind of buried cable failure terrestrial positioning instrument and localization method |
| CN111025306A (en) * | 2019-11-15 | 2020-04-17 | 浙江浙能天然气运行有限公司 | Vibration positioning method and system based on phase-sensitive OTDR |
| CN111049572A (en) * | 2018-10-12 | 2020-04-21 | 中国石油天然气股份有限公司 | Buried optical fiber fault point earth surface positioning system and method |
| CN111404598A (en) * | 2020-04-20 | 2020-07-10 | 深圳市特发信息股份有限公司 | Engineering construction communication optical cable positioning system based on phase sensitive optical time domain reflection |
| CN112578220A (en) * | 2020-11-26 | 2021-03-30 | 贵州电网有限责任公司 | Underground cable fault on-line positioning system and method |
| CN112798025A (en) * | 2021-03-19 | 2021-05-14 | 武汉昊衡科技有限公司 | Method for improving OFDR measurement spatial resolution and OFDR system |
| CN114563783A (en) * | 2022-04-26 | 2022-05-31 | 苏州光格科技股份有限公司 | Submarine cable route detection system and method |
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| CN111404598A (en) * | 2020-04-20 | 2020-07-10 | 深圳市特发信息股份有限公司 | Engineering construction communication optical cable positioning system based on phase sensitive optical time domain reflection |
| CN112578220A (en) * | 2020-11-26 | 2021-03-30 | 贵州电网有限责任公司 | Underground cable fault on-line positioning system and method |
| CN112798025A (en) * | 2021-03-19 | 2021-05-14 | 武汉昊衡科技有限公司 | Method for improving OFDR measurement spatial resolution and OFDR system |
| CN112798025B (en) * | 2021-03-19 | 2021-08-10 | 武汉昊衡科技有限公司 | Method for improving OFDR measurement spatial resolution and OFDR system |
| CN114563783A (en) * | 2022-04-26 | 2022-05-31 | 苏州光格科技股份有限公司 | Submarine cable route detection system and method |
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