CN105928634B - The temperature measuring device for high-voltage cable and method of the relevant domain analysis of single-ended Brillouin light - Google Patents

The temperature measuring device for high-voltage cable and method of the relevant domain analysis of single-ended Brillouin light Download PDF

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CN105928634B
CN105928634B CN201610249590.0A CN201610249590A CN105928634B CN 105928634 B CN105928634 B CN 105928634B CN 201610249590 A CN201610249590 A CN 201610249590A CN 105928634 B CN105928634 B CN 105928634B
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light
optical
fiber
temperature measuring
signal
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CN105928634A (en
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张建忠
李铸平
张明江
刘毅
王云才
张明涛
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Taiyuan University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32Measuring 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32Measuring 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
    • G01K11/322Measuring 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 Brillouin scattering

Abstract

The present invention relates to high-tension cable thermometric, the temperature measuring device for high-voltage cable and method of the relevant domain analysis of specially single-ended Brillouin light.It is double-end type to solve existing BOCDA systems, and systemic breakdown can be caused when occurring breakpoint in sensor fibre and can not be worked, therefore, using by certain the problem of restricting.The temperature measuring equipment includes detectable signal source, the first fiber coupler, single side-band modulator, the first image intensifer, light scrambler, electrooptic modulator, pulse signal generator, variable optical delay line, the second image intensifer, the second fiber coupler, optical circulator, sensor fibre, fiber optic loop, optical band pass filter, photodetector, data collecting card, computer;The detectable signal source is super-radiance light emitting diode either wide range chaos semiconductor laser or ASE noise source.The present invention uses the BOCDA sensor-based systems of single-ended structure, can be to avoid the restricted problem that can not work normally when there is breakpoint in both-end BOCDA sensor-based system optical fiber.

Description

The temperature measuring device for high-voltage cable and method of the relevant domain analysis of single-ended Brillouin light
Technical field
The present invention relates to high-tension cable thermometric, the temperature measuring device for high-voltage cable of the relevant domain analysis of specially single-ended Brillouin light And method.
Background technology
High-tension cable is the main means of electric system middle and long distance transmission high-power power, is called national economy " blood vessel " and " nerve ".In order to more safely and steadly run, high-tension cable by the way of underground laying, such as:Cable tunnel Road, cable duct, direct buried etc..Due to the heavy-duty service of underground laying bad environments and high-tension cable, high-tension cable is easily Aging causes cable safety accident to take place frequently.
The current-carrying capacity of high-tension cable and the temperature of cable conductor are closely related, according to the temperature changing trend of high-tension cable, Its operating status can be assessed, finds that the event of overload of high-tension cable prevents to improve the service life of high-tension cable in time The generation of cable fault.
Currently, the method for domestic and international Monitoring High Voltage Cable temperature, is broadly divided into according to temperature positioning method:1)Point type thermometric Technology;2)Quasi-distributed thermometry;3)Distributed temperature measuring technology.Point type thermometry mainly uses thermal resistance or thermocouple, But the on-line monitoring to whole high-tension cable temperature is can not achieve, can not find its overtemperature fault condition in time.Quasi-distributed survey Temperature technique mainly uses fiber grating as sensor, however, its monitoring distance is related with the quantity of monitoring point, it is several to monitor The quantity of ten kilometers of high-tension cable, monitoring point can sharply increase, this can cause the demodulating process of signal complicated, system it is reliable Property and economic cost are all difficult to receive.
Distributed temperature measuring technology mainly uses optical fibers as temperature sensor, the Raman based on optical fiber or Brillouin scattering effect It answers, realizes the continuous real-time monitoring to whole high-tension cable each point temperature.Distributed temperature measuring technology based on fiber raman scattering (Chinese invention patent, 103364107 A of CN), monitoring distance is shorter, cannot be satisfied the temperature prison of tens kilometers of high-tension cables It surveys.Brillouin intensity an order of magnitude higher than Raman scattering intensities, has on the temperature monitoring to long range high-tension cable There is larger advantage.
Distributed temperature measuring technology based on optical fiber Brillouin scattering effect, can be divided into:Time domain system and relevant domain system two Class.Time domain system realizes the positioning of high-tension cable temperature using pulse signal(Chinese invention patent, 105157872 A of CN), There are contradictions between monitoring distance and spatial resolution, cause spatial resolution generally at several meters.So low spatial resolution There are larger errors for the temperature evaluation current-carrying capacity that can cause using high-tension cable, can not correctly reflect that high-tension cable is really transported Row situation.In order to improve the spatial resolution of system, based on frequency by the continuous light of sinusoidal signal modulation as detectable signal Relevant domain system is used, including:Brillouin light is concerned with domain reflection technology(BOCDR, Brillouin Optical Correlation Domain Reflectometry)With Brillouin light coherent field analytical technology(BOCDA, Brillouin Optical Correlation Domain Analysis).Relative to BOCDR systems(Optics Express, 2008, vol.16, no.16, 12148), monitoring distance of the BOCDA systems with bigger(Optics Express, 2012, vol.20, no.24, 27094).But there are still the contradictory problems between monitoring distance and spatial resolution in principle. Recently, we have proposed utilize chaotic laser light(Chinese invention patent, 105136178 A of CN)Substitute existing BOCDA systems intermediate frequency Rate is realized the distributed sensing of fiber optic temperature by the continuous light of sinusoidal signal modulation, solves monitoring distance and spatial resolution Contradiction, still, BOCDA systems needs disclosed in 105136178 A of Chinese invention patent CN are noted respectively at sensor fibre both ends Enter pump light and detection light(As double-end type), systemic breakdown can be caused when occurring breakpoint in sensor fibre and can not be worked, Therefore, by the BOCDA distributed optical fiber sensing systems based on chaotic laser light be applied to high-tension cable temperature measure in, application by To certain restriction.
Invention content
The present invention solves existing BOCDA systems and needs to be injected separately into pump light and detection light at sensor fibre both ends(As Double-end type), systemic breakdown can be caused when occurring breakpoint in sensor fibre and can not be worked, therefore, using centainly being restricted The problem of, a kind of relevant domain analysis of single-ended Brillouin light is provided(BOCDA)Temperature measuring device for high-voltage cable and method.
The present invention adopts the following technical scheme that realization:The high-tension cable thermometric dress of the relevant domain analysis of single-ended Brillouin light It sets, by a single-mode fiber jumper, there are two the incidence ends of the first fiber coupler of exit end to connect with tool in detectable signal source It connects;The top exit end of first fiber coupler is sequentially connected to single side-band modulator, the first light amplification using single-mode fiber jumper The top incidence end of device, light scrambler and the second fiber coupler;The lower section exit end of first fiber coupler utilizes single-mode optics The lower section that fine wire jumper is sequentially connected to electrooptic modulator, variable optical delay line, the second image intensifer and the second fiber coupler is incident End, electrooptic modulator are connect with pulse signal generator;The exit end of second fiber coupler utilizes single-mode fiber jumper and light The incidence end of circulator connects;The reflection end of optical circulator is connect with one end of the sensor fibre of high-tension cable to be measured, height to be measured The another of the sensor fibre of voltage cable is terminated with fiber optic loop;Optical circulator exit end is sequentially connected to light belt using single-mode fiber jumper The signal input part of bandpass filter and photodetector;The signal output end of photodetector is connected with by coaxial cable for high frequency Data collecting card, data collecting card are connect with computer;The detectable signal source is super-radiance light emitting diode (superluminescent diode, SLD)Either wide range chaos semiconductor laser or ASE noise sources.
The high-tension cable temp measuring method of the relevant domain analysis of single-ended Brillouin light, this method is in single-ended cloth of the present invention Deep light, which is concerned in the temperature measuring device for high-voltage cable of domain analysis, to be realized, this method is realized using following steps:
The wide spectrum optical signal of detectable signal source output is divided into two-way through the first fiber coupler, and top exit end is sent out All the way as detection light, the another way that lower section exit end is sent out is as pump light;Detection light first passes through single side-band modulator tune A Stokes detection sideband is made, modulated detection light enters after the amplification of the first image intensifer, then through light scrambler It is mapped to incidence end on the upside of the second fiber coupler;Detection light can greatly improve transmission range, and energy after amplification improves power Enhance Stimulated Brillouin Scattering Process, to improve the temperature measuring distance of sensor fibre;It is inclined that the effect of light scrambler can curb light Influence of the polarization state to sensor-based system.
The pump light of exit end output below first fiber coupler, after electrooptic modulator, by pulse signal generator Generated pulse signal modulation, the list that modulated pump light controls pump light and transmit in opposite directions by variable optical delay line Sideband detects the position of light relevant effect in sensor fibre;Pump light signals after delay are amplified through the second image intensifer again Afterwards, can get sufficiently high power, with ensure any position in entire sensor fibre and single-side belt detection light occur by Swash brillouin gain effect;Amplified pump light is again incident on incidence end on the downside of the second fiber coupler.
The single-side belt detection light exported from the exit end of the second fiber coupler and the pump light being pulse modulation are incident on Incidence end on the left of optical circulator, and injected in sensor fibre from the reflection end of optical circulator;It is connected in the other end of sensor fibre Fiber optic loop constitute broadband mirrors;Reflected Stokes sideband is set to detect light and phase by adjusting variable optical delay line It meets to the pump light of transmission, and is interfered with pump light and generate interference beat frequency optical signal;Interfere beat frequency optical signal from ring The exit end of row device exports, and interference beat frequency optical signal receives after optical band pass filter filters out, then by photodetector, simultaneously will It is converted into electric signal, and the electric signal detected is then input to data collecting card, and data collecting card is by collected signal It is input to computer after A/D is converted, analysis is carried out to beat signal using computer and processing obtains high-tension cable somewhere Temperature regime.
Compared with existing high-tension cable thermometry, the present invention uses the BOCDA sensor-based systems of single-ended structure, both can be with Excited Brillouin gain effect based on optical fiber realizes the long distance monitoring to high-tension cable temperature, and can be to avoid both-end The restricted problem that can not work normally when there is breakpoint in BOCDA sensor-based system optical fiber.
Description of the drawings
Fig. 1 is the structural schematic diagram that temperature measuring device for high-voltage cable of the present invention uses the first fibre optic installations mode.
Fig. 2 is schematic diagram of the present invention using high-tension cable cross section when second of fibre optic installations mode.
In figure, 1- detectable signals source;The first fiber couplers of 2-;3- single side-band modulators;The first image intensifers of 4-; 5- light scramblers;6- electrooptic modulators;7- pulse signal generators;8- variable optical delay lines;The second image intensifers of 9-; The second fiber couplers of 10-;11- optical circulators;12- sensor fibres;13- fiber optic loops;14- optical band pass filters;15- Photodetector;16- data collecting cards;17- computers;18- high-tension cables;The cable tunnels 19- or cable duct.
Specific implementation mode
The temperature measuring device for high-voltage cable of the relevant domain analysis of single-ended Brillouin light, detectable signal source 1 passes through a single mode optical fiber There are two the incidence ends of the first fiber coupler 2 of exit end to connect with tool for wire jumper;The top exit end of first fiber coupler Single side-band modulator 3, the first image intensifer 4, light scrambler 5 and the second fiber coupler are sequentially connected to using single-mode fiber jumper 10 top incidence end;The lower section exit end of first fiber coupler 2 is sequentially connected to electrooptic modulator using single-mode fiber jumper 6, the lower section incidence end of variable optical delay line 8, the second image intensifer 9 and the second fiber coupler 10, electrooptic modulator 6 and pulse Signal generator 7 connects;The exit end of second fiber coupler 10 utilizes the incidence end of single-mode fiber jumper and optical circulator 11 Connection;The reflection end of optical circulator 11 is connect with one end of the sensor fibre 12 of high-tension cable 18 to be measured, high-tension cable 18 to be measured The another of sensor fibre 12 be terminated with fiber optic loop 13;11 exit end of optical circulator is sequentially connected to light belt using single-mode fiber jumper The signal input part of bandpass filter 14 and photodetector 15;The signal output end of photodetector 15 passes through coaxial cable for high frequency It is connected with data collecting card 16, data collecting card 16 is connect with computer 17;The detectable signal source 1 is superradiation light-emitting two Pole pipe(superluminescent diode, SLD)Either wide range chaos semiconductor laser or ASE noise sources.
When it is implemented, 1 preferred super-radiance light emitting diode of detectable signal source, that is, SLD light sources.SLD light sources are a kind of width Spectrum, high-output power, high reliability, the semiconductor light-emitting device of low coherence, optical property between LD and LED it Between, have both wide spectrum and powerful advantage.SLD light sources are mainly by luminous tube tube core, thermal resistor and semiconductor cooler Composition.Current commercialization SLD light sources are very ripe, can be 150nm with output spectral width, and Output optical power reaches the light of 200mW Signal.The detectable signal of use is the wide range optical signal of SLD outputs, and there is low-down coherence length, this coherence length to determine Determine the spatial resolution of the present invention, and it is unrelated with distance sensing.This fundamentally solves traditional pulse temporal sensing system System or frequency by Sine Modulated continuous light coherent field sensor-based system during Monitoring High Voltage Cable temperature, monitoring distance and Contradiction between spatial resolution.It uses light source for SLD, has both the advantage of LD and LED respectively, can get wide spectrum, Low coherence State, high-power optical signal.SLD is more simpler than chaotic laser light source structure, Output optical power more wider than the spectrum of chaotic laser light Higher;It is more simpler than erbium-doped fiber amplifier or semiconductor optical amplifier structure, than the power higher of ASE noise optical signals. Therefore, the BOCDA distributed optical fiber sensing systems based on SLD, it is more distributed than the BOCDA based on chaotic laser light source and image intensifer Sensor-based system has greater compactness of structure, and monitoring distance is farther, spatial resolution higher.
When it is implemented, the coupling ratio of the first fiber coupler 2 is 50:50;First image intensifer 4 and the second image intensifer 9 using commercial erbium-doped fiber amplifier or semiconductor optical amplifier;Variable optical delay line 8 is classified using the multichannel of photoswitch control Fibre delay line series connection high precision electric control variable optical delay line cascading forms, for example, AM General photoelectricity company is automatically controlled Variable optical delay line MDL-002, delay resolution are less than 0.3 micron, to ensure that apparatus of the present invention realize long range and high-altitude Between resolution ratio sensing temperature detection.
Two kinds of system of laying may be used in the sensor fibre 12 of high-tension cable temp measuring system of the present invention, the first is applied If mode be sensor fibre is attached directly to high-tension cable surface it is as shown in Figure 1;Second of system of laying is in high-voltage electricity In cable process, it is as shown in Figure 2 that sensor fibre 12 is placed in cable slack layer.Since both system of laying cut both ways, Depending on specifically should be according to site specific using which kind of mode.Sensor fibre 12 of the present invention is the common list of commercialization Mode fiber is G.652 serial.
The high-tension cable temp measuring method of the relevant domain analysis of single-ended Brillouin light, this method is in single-ended cloth of the present invention Deep light, which is concerned in the temperature measuring device for high-voltage cable of domain analysis, to be realized, this method is realized using following steps:
The wide spectrum optical signal that detectable signal source 1 exports divides through the first fiber coupler 2 for two-way, top exit end hair What is gone out is used as detection light all the way, and the another way that lower section exit end is sent out is as pump light;Detection light first passes through single side-band modulator 3 It is modulated into Stokes detection sideband, modulated detection light is after the first image intensifer 4 amplifies, then through light scrambler 5 are incident on 10 upside incidence end of the second fiber coupler;Detection light can greatly improve transmission range after amplification improves power, And Stimulated Brillouin Scattering Process can be enhanced, to improve the temperature measuring distance of sensor fibre;The effect of light scrambler 5 can curb The influence that polarization state generates.
The pump light of first fiber coupler, 2 lower section exit end output is occurred after electrooptic modulator 6 by pulse signal Pulse signal modulation caused by device 7, modulated pump light control pump light and opposite transmission by variable optical delay line 8 Single-side belt detect light in sensor fibre 12 be concerned with effect position;Pump light signals after delay are again through the second image intensifer After 9 amplifications, sufficiently high power is can get, to ensure any position in entire sensor fibre 12 and single-side belt detection light Excited Brillouin gain effect occurs;Amplified pump light is again incident on 10 downside incidence end of the second fiber coupler.
The single-side belt detection light exported from the exit end of the second fiber coupler 10 and the pump light being pulse modulation are incident It is injected in sensor fibre 12 to 11 left side incidence end of optical circulator, and from the reflection end of optical circulator 11;In sensor fibre 12 The fiber optic loop 13 of other end connection constitutes broadband mirrors;Make reflected Stokes side by adjusting variable optical delay line It meets with the pump light transmitted in opposite directions with detection light, and is interfered with pump light and generate interference beat frequency optical signal;Interference is clapped Frequency optical signal is exported from the exit end of circulator 11, interferes beat frequency optical signal after optical band pass filter 14 filters out, then by photoelectricity Detector 15 receives, while being translated into electric signal, and the electric signal detected is then input to data collecting card 16, data Collected signal is input to computer 17 by capture card 16 after A/D is converted, and is divided beat signal using computer Analysis and processing obtain the temperature regime in high-tension cable somewhere.

Claims (6)

  1. A kind of temperature measuring device for high-voltage cable of domain analysis 1. single-ended Brillouin light is concerned with, which is characterized in that detectable signal source(1)It is logical Crossing a single-mode fiber jumper, there are two the first fiber couplers of exit end with tool(2)Incidence end connection;First optical fiber coupling The top exit end of clutch is sequentially connected to single side-band modulator using single-mode fiber jumper(3), the first image intensifer(4), light disturbs Inclined device(5)With the second fiber coupler(10)Top incidence end;First fiber coupler(2)Lower section exit end utilize single mode Optical patchcord is sequentially connected to electrooptic modulator(6), variable optical delay line(8), the second image intensifer(9)With the second fiber coupler (10)Lower section incidence end, electrooptic modulator(6)With pulse signal generator(7)Connection;Second fiber coupler(10)Go out It penetrates end and utilizes single-mode fiber jumper and optical circulator(11)Incidence end connection;Optical circulator(11)Reflection end and sensing to be measured Optical fiber(12)One end connection, sensor fibre to be measured(12)The other end be terminated with fiber optic loop(13);Optical circulator(11)Outgoing End is sequentially connected to optical band pass filter using single-mode fiber jumper(14)And photodetector(15)Signal input part;Photoelectricity is visited Survey device(15)Signal output end data collecting card is connected with by coaxial cable for high frequency(16), data collecting card(16)With calculating Machine(17)Connection;The detectable signal source(1)For super-radiance light emitting diode either wide range chaos semiconductor laser or ASE noise sources.
  2. The temperature measuring device for high-voltage cable of domain analysis 2. single-ended Brillouin light according to claim 1 is concerned with, which is characterized in that Sensor fibre(12)It is attached directly to the surface of high-tension cable;Or in high-tension cable process, by sensor fibre(12) It is placed in cable slack layer.
  3. The temperature measuring device for high-voltage cable of domain analysis 3. single-ended Brillouin light according to claim 1 or 2 is concerned with, feature exist In the first image intensifer(4)With the second image intensifer(9)Using commercial erbium doped optical fibre light amplifier or semiconductor optical amplifier.
  4. The temperature measuring device for high-voltage cable of domain analysis 4. single-ended Brillouin light according to claim 1 or 2 is concerned with, feature exist In variable optical delay line(8)Light delay can be changed using the multichannel classification fibre delay line series connection high precision electric control of photoswitch control Line cascading forms.
  5. The temperature measuring device for high-voltage cable of domain analysis 5. single-ended Brillouin light according to claim 4 is concerned with, which is characterized in that Variable optical delay line(8)Using the automatically controlled variable optical delay line MDL-002 of AM General photoelectricity company.
  6. The high-tension cable temp measuring method of domain analysis 6. a kind of single-ended Brillouin light is concerned with, it is characterised in that this method is wanted in such as right It asks the single-ended Brillouin light described in 1 to be concerned in the temperature measuring device for high-voltage cable of domain analysis to realize, this method is to use following steps It realizes:
    Detectable signal source(1)The wide spectrum optical signal of output is through the first fiber coupler(2)It is divided into two-way, top exit end hair What is gone out is used as detection light all the way, and the another way that lower section exit end is sent out is as pump light;Detection light first passes through single side-band modulator (3)It is modulated into a Stokes detection sideband, modulated detection light passes through the first image intensifer(4)After amplification, then through light Scrambler(5)It is incident on the second fiber coupler(10)Upside incidence end;Detection light can be carried greatly after amplification improves power High-transmission distance, and Stimulated Brillouin Scattering Process can be enhanced, to improve the temperature measuring distance of sensor fibre;Light scrambler(5) Effect can curb polarization state generation influence;
    First fiber coupler(2)The pump light of lower section exit end output, through electrooptic modulator(6)Afterwards, occurred by pulse signal Device(7)Generated pulse signal modulation, modulated pump light pass through variable optical delay line(8)To control pump light and opposite The single-side belt of transmission detects light in sensor fibre(12)In be concerned with effect position;Pump light signals after delay are again through the second light Amplifier(9)After amplification, sufficiently high power is can get, to ensure in entire sensor fibre(12)In any position and list Sideband detects light and excited Brillouin gain effect occurs;Amplified pump light is again incident on the second fiber coupler(10)Downside Incidence end;
    From the second fiber coupler(10)Exit end output single-side belt detection light and the pump light that is pulse modulation be incident on Optical circulator(11)Left side incidence end, and from optical circulator(11)Reflection end inject sensor fibre(12)In;In sensor fibre (12)The other end connection fiber optic loop(13)Constitute broadband mirrors;By adjust variable optical delay line make it is reflected this Lentor sideband detection light meets with the pump light transmitted in opposite directions, and is interfered with pump light and generate interference beat frequency light letter Number;Interfere beat frequency optical signal from circulator(11)Exit end output, interference beat frequency optical signal through optical band pass filter(14)Filter After going out, then by photodetector(15)It receives, while being translated into electric signal, the electric signal detected is then input to number According to capture card(16), data collecting card(16)Collected signal is input to computer after A/D is converted(17), utilize meter Calculation machine analyzes beat signal and is handled to obtain the temperature regime in high-tension cable somewhere.
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