CN106644160A - System and method for distributed temperature measurement in ultra-long optical cable - Google Patents
System and method for distributed temperature measurement in ultra-long optical cable Download PDFInfo
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- CN106644160A CN106644160A CN201710091383.1A CN201710091383A CN106644160A CN 106644160 A CN106644160 A CN 106644160A CN 201710091383 A CN201710091383 A CN 201710091383A CN 106644160 A CN106644160 A CN 106644160A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 15
- 238000009529 body temperature measurement Methods 0.000 title abstract 3
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 230000001427 coherent effect Effects 0.000 claims abstract description 40
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims description 66
- 238000012545 processing Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000011218 segmentation Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 abstract 4
- 238000005259 measurement Methods 0.000 description 7
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 230000008054 signal transmission Effects 0.000 description 4
- 210000001367 artery Anatomy 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
Abstract
The invention discloses a system for distributed temperature measurement in an ultra-long optical cable. The system comprises a first Raman coherent light frequency domain detection system, a second Raman coherent light frequency domain detection system, an upstream single-mode optical fiber, a downstream single-mode optical fiber and repeaters; two ends of the upstream single-mode optical fiber and the downstream single-mode optical fiber are connected with the first Raman coherent light frequency domain detection system and the second Raman coherent light frequency domain detection system respectively; detection pulse light of the first Raman coherent light frequency domain detection system and the second Raman coherent light frequency domain detection system penetrates into the upstream single-mode optical fiber and the downstream single-mode optical fiber; and the repeaters are mounted in all subsections of the upstream single-mode optical fiber and the downstream single-mode optical fiber respectively. By adopting the system disclosed by the invention, the problems that the temperature measurement resolution ratio of a traditional long-distance optical fiber group is low and the signal-to-noise ratio loss is large, a back scattering signal cannot be returned along an original path when an isolator is adopted so that a scattering light signal is difficult to detect are solved.
Description
Technical field
The present invention relates to fiber optic cable monitor technical field, and in particular to a kind of method of optical cable temperature monitoring, repeater and logical
Letter system.
Background technology
In extra long distance cable system, the temperature of monitoring system can be important, because temperature affects the biography of optical cable
Defeated situation and service life.Known monitoring temperature method includes that determining (R-COTDR) using Raman coherent light time domain reflection sets
In standby and technology, but technique, input optical fibre is pulsed light, when its spatial resolution and signal to noise ratio, dynamic range, measurement
Between between there is contradiction.
In more detail, to improve the spatial resolution of measurement must just reduce pulsewidth, and the pulsewidth of pulsed light is narrower, input
The optical pulse energy of optical fiber is lower, and the bandwidth needed for measurement is also wider, and energy is reduced and Measurement bandwidth increase can all make system
Signal to noise ratio be deteriorated, so the measurement required time will be significantly elongated.R-COTDR uses continuous light, such system
Signal to noise ratio just and spatial resolution it doesn't matter, it is possible to improve spatial resolution in the case where signal to noise ratio is not lost.
In recent years, with the gradually development of dense wavelength division multiplexing technology and erbium-doped fiber amplifier (EDFA) technology, in
It is also progressively ripe after technology, therefore data throughout is remarkably improved, it is widely applied.Cores of the EDFA as repeater
Heart element, will generally use isolator, to prevent circuit in reflected light inversely amplifies the infringement caused to EDFA, but use is isolated
Device can cause the backscatter signals can not be by along backtracking, so that be difficult to detect scattered light signal.
The content of the invention
The technical problem to be solved in the present invention be to provide in a kind of overlength optical cable be used for distributed satellite systems system and
Method, using the system and method for being used for distributed satellite systems in a kind of overlength optical cable traditional long-distance optical fiber group is solved
Temperature survey resolution ratio is low, snr loss is big, and using isolator can cause backscatter signals can not by along backtracking,
So that it is difficult to detect the problem of scattered light signal.
The technical scheme of the offer of the present invention is to provide a kind of system for being used for distributed satellite systems in overlength optical cable,
Including the first Raman coherent light frequency domain detection system, the second Raman coherent light frequency domain detection system, up single-mode fiber, descending list
Mode fiber and repeater, described up single-mode fiber and descending single-mode fiber two ends is examined respectively with the first Raman coherent light frequency domain
Examining system and the second Raman coherent light frequency domain detection system connect；First Raman coherent light frequency domain detection system and the second Raman phase
The direct impulse light of dry light frequency domain detecting system is in the inside of up single-mode fiber and descending single-mode fiber；Described up single mode
Repeater is mounted in optical fiber and descending single-mode fiber each segmentation.
Described repeater includes the first image intensifer, the second image intensifer, the first loopback passage and the second loopback passage,
Described the first image intensifer and the second image intensifer connects and constitutes ring-type by the first loopback passage and the second loopback passage
Structure.
Described up single-mode fiber and descending single-mode fiber is each optical fiber at least including more than one.
It is used for the measuring method of distributed temperature in its overlength optical cable, comprises the following steps：
The first step, by the first Raman coherent light frequency domain detection system and the second Raman coherent light frequency domain detection system and up single mode
Optical fiber and descending single-mode fiber are attached；
Second step, repeater is arranged in each segmentation of up single-mode fiber and descending single-mode fiber；
3rd step, by the direct impulse of the first Raman coherent light frequency domain detection system and the second Raman coherent light frequency domain detection system
Light is injected into up single-mode fiber and descending single-mode fiber；
Back scattering Raman optical signal in 4th step, the up single-mode fiber of collection and descending single-mode fiber, to obtain a large amount of optical cables
The temperature information of the optical fiber every bit along the line under normal operation, and set up initial data archives；
5th step, according to step（Four）The initial data archives of gained, carry out data processing, so as to the temperature for obtaining the optical cable is supervised
Survey the Mean curve of data.
Described data processing is averaged for long-time Monitoring Data.
Using technical scheme provide it is a kind of in overlength optical cable be used for distributed satellite systems system and
Method, operationally, using Raman coherent light frequency domain detection system（R-COFDR）, R-COFDR is connected with single-mode fiber
Connect, described single-mode fiber is that optical cable is carried, the direct impulse light of R-COFDR is injected into single-mode fiber, and collect single mode
Back scattering Raman optical signal in optical fiber, to obtain the temperature information of the optical fiber every bit along the line under a large amount of optical cables normally run,
Set up initial data archives.The R-COFDR analyzes initial data archives, and long-time Monitoring Data is averaged, to obtain
The Mean curve of the temperature monitoring data of the optical cable.
The repeater of the present invention is logical including the first image intensifer, the second image intensifer, the first loopback passage and the second loopback
Road, described the first image intensifer and the second image intensifer connects and constitutes ring by the first loopback passage and the second loopback passage
Shape structure, the repeater package for being provided is logical containing the first image intensifer, the second image intensifer, the first loopback passage and the second loopback
Road, the first image intensifer and the second image intensifer all have input and export, and are all used for the amplification to optical signal, the first ring
Returning passage is used to for the Raman Back Scattering light in downlink to introduce uplink, and by second image intensifer, it is right
Optical signal transmission and amplification, then enter the R-COFDR positioned at initial end by uplink, complete the number to optical signal
According to process and detection.Second loopback passage is used to for the Raman Back Scattering light in uplink to introduce downlink, and passes through
First image intensifer, to optical signal transmission and amplification, then by uplink in multistage EDFA amplified step by step,
Into the R-COFDR positioned at right-hand member, the data processing to optical signal and detection are completed, and then draw required temperature value.
The up single-mode fiber and descending single-mode fiber of the present invention is each optical fiber at least including more than one, is had respectively extremely
A few up single-mode fiber and descending single-mode fiber, you can composition optical fiber circuit, are more suitable for multifiber and combine.
The data processing of the present invention is averaged for long-time Monitoring Data, and mean value can disappear only a few distortion data
Remove, so that measurement data is truer.
Compared with prior art, without using isolator, it is possible to be enough in the optical cable that there are long repeater span
R-COFDR is monitored, and high resolution, snr loss is little.
In sum, tradition can be solved using the system and method for being used for distributed satellite systems in a kind of overlength optical cable
Long-distance optical fiber group temperature survey resolution ratio is low, snr loss big, and backscatter signals can be caused using isolator
Can not be by along backtracking, so that be difficult to detect the problem of scattered light signal.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the repeater structure figure of the present invention；
Description of reference numerals：1st, the first Raman coherent light frequency domain detection system, 2, repeater, 3, descending single-mode fiber, 4, up
Single-mode fiber, the 5, second Raman coherent light frequency domain detection system, the 21, first image intensifer, the 22, second image intensifer, 23, second
Loopback passage, the 24, first loopback passage.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment to invention be described further：
As shown in Fig. 1～2, a kind of system for being used for distributed satellite systems in overlength optical cable, including the first Raman coherent light
Frequency domain detection system 1, the second Raman coherent light frequency domain detection system 5, up single-mode fiber 4, descending single-mode fiber 3 and repeater
2, up single-mode fiber 4 and the two ends of descending single-mode fiber 3 respectively with the first Raman coherent light frequency domain detection system 1 and the second Raman
Coherent light frequency domain detection system 5 connects；First Raman coherent light frequency domain detection system 1 and the second Raman coherent light frequency domain detection system
The direct impulse light of system 5 is in the inside of up single-mode fiber 4 and descending single-mode fiber 3；Up single-mode fiber 4 and descending single-mode optics
Repeater 2 is mounted in fine 3 each segmentation.
Further repeater 2 includes the first image intensifer 21, the second image intensifer 22, the first loopback passage 24 and second
Loopback passage 23, described the first image intensifer 21 and the second image intensifer 22 is logical by the first loopback passage 24 and the second loopback
Road 23 connects and constitutes circulus, and the repeater package for being provided is led to containing the first image intensifer, the second image intensifer, the first loopback
Road and the second loopback passage, the first image intensifer and the second image intensifer all have input and export, and are all used to believe light
Number amplification, the first loopback passage is used to for the Raman Back Scattering light in downlink to introduce uplink, and by described
Second image intensifer, to optical signal transmission and amplification, then enters the R-COFDR positioned at initial end by uplink,
Complete the data processing to optical signal and detection.Second loopback passage is used to introduce the Raman Back Scattering light in uplink
Downlink, and by first image intensifer, to optical signal transmission and amplification, then by uplink in it is multistage
EDFA is amplified step by step, enters the R-COFDR positioned at right-hand member, completes the data processing to optical signal and detection, and then
Draw required temperature value.
Further up single-mode fiber 4 and descending single-mode fiber 3 are each optical fiber at least including more than one, there is difference
At least one up single-mode fiber and descending single-mode fiber, you can composition optical fiber circuit, are more suitable for multifiber and combine.
A kind of system for being used for distributed satellite systems in overlength optical cable provided using technical scheme, is pressed
The connection of each equipment and part is carried out according to technical scheme, using Raman coherent light frequency domain detection system（R-
COFDR）, R-COFDR and single-mode fiber are attached and the direct impulse light of R-COFDR are injected into single-mode fiber, by
It is attached according to required after device.
Jing is tested, and is all connected with normally in confirmation all parts and equipment, it is possible in the case of stable operation, you can be powered
Tested.Tested in accordance with the following methods during test：
The first step, by the first Raman coherent light frequency domain detection system 1 and the second Raman coherent light frequency domain detection system 5 and up list
Mode fiber 4 and descending single-mode fiber 3 are attached；
Second step, repeater 2 is arranged in each segmentation of up single-mode fiber 4 and descending single-mode fiber 3；
3rd step, by the first Raman coherent light frequency domain detection system 1 and the detection arteries and veins of the second Raman coherent light frequency domain detection system 5
Wash off and be injected into up single-mode fiber 4 and descending single-mode fiber 3；
Back scattering Raman optical signal in 4th step, the up single-mode fiber 4 of collection and descending single-mode fiber 3, to obtain a large amount of light
The temperature information of the optical fiber every bit along the line under the normal operation of cable, and set up initial data archives；
5th step, according to step（Four）The initial data archives of gained, carry out data processing, so as to the temperature for obtaining the optical cable is supervised
Survey the Mean curve of data.
Further data processing is averaged for long-time Monitoring Data, and mean value can disappear only a few distortion data
Remove, so that measurement data is truer.
Compared with prior art, without using isolator, it is possible to be enough in the optical cable that there are long repeater span
R-COFDR is monitored, and high resolution, snr loss is little.
In sum, tradition can be solved using the system and method for being used for distributed satellite systems in a kind of overlength optical cable
Long-distance optical fiber group temperature survey resolution ratio is low, snr loss big, and backscatter signals can be caused using isolator
Can not be by along backtracking, so that be difficult to detect the problem of scattered light signal.
Claims (5)
1. a kind of system for being used for distributed satellite systems in overlength optical cable, including the first Raman coherent light frequency domain detection system
（1）, the second Raman coherent light frequency domain detection system（5）, up single-mode fiber（4）, descending single-mode fiber（3）And repeater（2）,
It is characterized in that：Described up single-mode fiber（4）With descending single-mode fiber（3）Two ends respectively with the first Raman coherent light frequency domain
Detecting system（1）With the second Raman coherent light frequency domain detection system（5）Connection；First Raman coherent light frequency domain detection system（1）
With the second Raman coherent light frequency domain detection system（5）Direct impulse light in up single-mode fiber（4）With descending single-mode fiber（3）
Inside；Described up single-mode fiber（4）With descending single-mode fiber（3）Repeater is mounted in each segmentation（2）.
2. it is according to claim 1 it is a kind of in overlength optical cable be used for distributed satellite systems system, it is characterised in that：
Described repeater（2）Including the first image intensifer（21）, the second image intensifer（22）, the first loopback passage（24）With the second ring
Return passage（23）, described the first image intensifer（21）With the second image intensifer（22）By the first loopback passage（24）With second
Loopback passage（23）Connect and constitute circulus.
3. it is according to claim 1 it is a kind of in overlength optical cable be used for distributed satellite systems system, it is characterised in that：
Described up single-mode fiber（4）With descending single-mode fiber（3）For the optical fiber for respectively at least including more than one.
4. a kind of measuring method for being used for distributed temperature in overlength optical cable, comprises the following steps：
The first step, by the first Raman coherent light frequency domain detection system（1）With the second Raman coherent light frequency domain detection system（5）With it is upper
Row single-mode fiber（4）And descending single-mode fiber（3）It is attached；
Second step, by repeater（2）Installed in up single-mode fiber（4）With descending single-mode fiber（3）Each segmentation in；
3rd step, by the first Raman coherent light frequency domain detection system（1）With the second Raman coherent light frequency domain detection system（5）Spy
Survey pulsed light and be injected into up single-mode fiber（4）With descending single-mode fiber（3）；
4th step, the up single-mode fiber of collection（4）With descending single-mode fiber（3）In back scattering Raman optical signal, it is big to obtain
The temperature information of the optical fiber every bit along the line under the normal operation of amount optical cable, and set up initial data archives；
5th step, according to step（Four）The initial data archives of gained, carry out data processing, so as to the temperature for obtaining the optical cable is supervised
Survey the Mean curve of data.
5. it is according to claim 4 it is a kind of in overlength optical cable be used for distributed temperature measuring method, it is characterised in that：
Described data processing is averaged for long-time Monitoring Data.
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| CN201710091383.1A CN106644160B (en) | 2017-02-21 | 2017-02-21 | System and method for distributed temperature measurement in ultra-long optical cable |
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| CN106644160B CN106644160B (en) | 2023-11-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588926A (en) * | 2017-10-30 | 2018-01-16 | 中光华研电子科技有限公司 | A kind of fault monitoring system and method for overlength optical cable |
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| CN201903355U (en) * | 2010-10-29 | 2011-07-20 | 上海华魏光纤传感技术有限公司 | Super-long distance distributed optical fiber sensing device |
| CN202710206U (en) * | 2012-06-07 | 2013-01-30 | 北京航空航天大学 | Fiber Raman temperature measuring system allowing cascade distribution |
| CN103759852A (en) * | 2011-12-30 | 2014-04-30 | 上海华魏光纤传感技术有限公司 | Ultra remote distributed-type optical fiber Raman temperature sensing device |
| CN104614091A (en) * | 2015-02-05 | 2015-05-13 | 中国科学院合肥物质科学研究院 | All-fiber long-distance high-spatial-resolution single-photon temperature sensor |
| CN204575099U (en) * | 2014-12-25 | 2015-08-19 | 长城信息产业股份有限公司 | Distributed raman amplification and EDFA technology is utilized to improve the device of remote BOTDR system temperature resolution |
| CN105805556A (en) * | 2015-09-30 | 2016-07-27 | 李儒峰 | Distributed optical fiber leakage monitoring system |
-
2017
- 2017-02-21 CN CN201710091383.1A patent/CN106644160B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6370131A (en) * | 1986-09-12 | 1988-03-30 | Hitachi Cable Ltd | Optical fiber type temperature distribution measuring apparatus |
| CN201903355U (en) * | 2010-10-29 | 2011-07-20 | 上海华魏光纤传感技术有限公司 | Super-long distance distributed optical fiber sensing device |
| CN103759852A (en) * | 2011-12-30 | 2014-04-30 | 上海华魏光纤传感技术有限公司 | Ultra remote distributed-type optical fiber Raman temperature sensing device |
| CN202710206U (en) * | 2012-06-07 | 2013-01-30 | 北京航空航天大学 | Fiber Raman temperature measuring system allowing cascade distribution |
| CN204575099U (en) * | 2014-12-25 | 2015-08-19 | 长城信息产业股份有限公司 | Distributed raman amplification and EDFA technology is utilized to improve the device of remote BOTDR system temperature resolution |
| CN104614091A (en) * | 2015-02-05 | 2015-05-13 | 中国科学院合肥物质科学研究院 | All-fiber long-distance high-spatial-resolution single-photon temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107588926A (en) * | 2017-10-30 | 2018-01-16 | 中光华研电子科技有限公司 | A kind of fault monitoring system and method for overlength optical cable |
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