CN110243494A - Temperature measuring device for high-voltage cable and method based on the single-ended BOTDA of super continuum source - Google Patents
Temperature measuring device for high-voltage cable and method based on the single-ended BOTDA of super continuum source Download PDFInfo
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- 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
- G01K11/322—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 Brillouin scattering
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Abstract
The present invention is temperature measuring device for high-voltage cable and method based on the single-ended BOTDA of super continuum source.Traditional high-tension cable thermometric not can guarantee distance sensing and monitor effective measurement of blind spot；The present invention is that the single-ended BOTDA based on super continuous spectrums can effectively avoid the immeasurable problem of both-end Brillouin optical time domain analysis breakpoint, and use super continuum source as laser source, it is with ultra-wide spectrum, enough output powers, it can be achieved that superelevation spatial resolution and overlength detection range monitoring capability.System has high spatial resolution, solves the accurate monitoring problem of real time temperature of high-tension cable.Apparatus of the present invention include super continuum source, three adjustable light wave-filters, three 1 × 2 fiber couplers, two Polarization Controllers, two high-speed electro-optic modulators, microwave signal source, three image intensifers, 2 × 1 fiber couplers, optical circulator, sensor fibre, fiber reflector, impulse generator, three photodetectors, data collecting card, computers, high-tension cable.
Description
Technical field
The present invention is applied to high-tension cable field of temperature measurement, the specially high-voltage electricity based on the single-ended BOTDA of super continuum source
Cable temperature measuring equipment and method, using the backward Rayleigh scattering and stimulated Brillouin scattering effect of super continuum source in a fiber,
It can be realized the continuous measurement to high-tension cable temperature high spatial resolution, long range.
Background technique
High-tension cable is one kind of power cable, and transmission voltage range is 1kv-1000kv, be applied to power transmission and
Distribution etc..With the increase of electricity, high-tension cable is chronically under overload operation state, and cable is made to generate big calorimetric, so that
Core temperature increase, cable heated expansion, insulating layer under high temperature environment can accelerated ageing, very influence cable life, high pressure
Cable insulation reduces, and breakdown accident occurrence probability becomes larger, there is very big security risk, if running environment is severe, there is height
Temperature-heat-source, etchant gas etc. damage the presence of cable substance, and high-voltage cable insulating layer can be weaker, and accident can more frequently.
The monitoring of high-tension cable running temperature is most important for high pressure electrical power trans mission/distribution system.The variation of high-tension cable temperature,
On the one hand the reason of coming from cable resistance itself, on the other hand due to the variation of natural environment around high-tension cable, in order to
The safe operation of high voltage power transmisson system needs to establish high voltage power cable real-time online temp measuring system.Currently, based on distributed light
The temperature sensor of fibre sensing is answered because it has many advantages, such as that measurement accuracy is high, measures distance, strong antijamming capability
In online monitoring system for high voltage power cable temperature.
The high-tension cable thermometry of present comparative maturity is the Distributed Optical Fiber Sensing Techniques based on Raman scattering, is utilized
Cable carries out temperature detection monitoring.A kind of self-compensating fiber Raman cable temperature monitoring of decaying and alarm system (Chinese invention patent,
CN103364107A), this optical fiber Raman distributed temperature sensor can be eliminated along cable because of bending, strain, node damage
Consumption, the influence especially to work long hours with the variation of optical fiber attenuation caused by the factors such as working environment difference, realizes oneself of decaying
Compensation improves the Stability and dependability of system thermometric.But its monitoring distance is limited, spatial resolution is low, cannot achieve length
Distance applications.Distributed optical fiber temperature measurement technology of the another kind based on Raman scattering current-carrying capacity of cable monitoring system (application No. is
201721110404.1) temperature information of the horizontal and vertical each section of cable can accurately be obtained, but optical fiber is lost makes on the way
It is limited to obtain Fibre Optical Sensor distance.
Because Brillouin scattering is compared to Raman scattering, energy intensity is big, detection is easy, to long range high-tension cable
Dynamic range is bigger on temperature monitoring, and transmission range is farther.And distributed temperature is realized using the Brillouin scattering in optical fiber
The system of measurement, due to working under non-linear stimulated scattering state, generated Brillouin scattering light intensity is larger, and has
Higher temperature sensitivity is a kind of system of great practical value.Distributing optical fiber sensing of the tradition based on Brillouin scattering
Two types can be divided into: one is domain systems when perceiving temperature/strain light along optical fiber using pulse signal, another
It is using the continuous light of sinusoidal signal frequency modulation as the light correlation domain system of transducing signal.
High-tension cable thermometry based on related domain analysis is usually spatial resolution height, but limited transmission distance.
The temperature measuring device for high-voltage cable of the relevant domain analysis of single-ended Brillouin light and method (Chinese invention patent, 105928634 A of CN) choosing
Super-radiance light emitting diode is selected as system source, although spatial resolution improves, measurement distance is unable to satisfy demand.
Based on time-domain analysis high-tension cable thermometry generally use pulse signal realize high-tension cable temperature positioning (in
State's patent of invention, 105157872 A of CN), monitoring distance and spatial resolution because pulse width limitation so that space
Resolution ratio usually in rice magnitude, is unable to monitor the blind area of high-tension cable.
The high-tension cable thermometric requirement high in face of measurement accuracy, measurement distance range is remote, we have proposed one kind based on super
The monitoring to high-tension cable temperature may be implemented in the temperature measuring device for high-voltage cable and method of the single-ended BOTDA of continuous spectrum light source, excellent
Point is this system output power, and dynamic range is big, and spatial resolution is high, can carry out high-precision cable temperature to whole cable
Real-time monitoring.
Summary of the invention
The present invention proposes temperature measuring device for high-voltage cable and method based on the single-ended BOTDA of super continuum source, utilizes super company
Continuous spectrum light source replaces the measurement and positioning of light pulse signal realization fiber optic temperature.Can solve in current HV CABLE SYSTEM there is
Distance sensing and spatial resolution between both contradictory problems.And it avoids and breaks in both-end BOTDA sensor-based system optical fiber
The restricted problem that can not work normally when point.It realizes to high-tension cable in real time without blind monitoring.
Based on the temperature measuring device for high-voltage cable of the single-ended BOTDA of super continuum source, including it is super continuum source, first adjustable
Humorous optical filter, 1 × 2 first fiber couplers, the first Polarization Controller, the first high-speed electro-optic modulator, microwave signal source,
It is one image intensifer, 2 × 1 fiber couplers, optical circulator, sensor fibre, fiber reflector, the second Polarization Controller, second high
Fast electrooptic modulator, impulse generator, 1 × 2 second fiber couplers, the second image intensifer, third image intensifer, 1 × 2 third
Fiber coupler, the second adjustable light wave-filter, third adjustable light wave-filter, the first photodetector, the second photodetection
Device, third photodetector, data collecting card, computer, high-tension cable；
Wherein, the exit end of super continuum source is connect with the incidence end of the first adjustable light wave-filter；The filter of first tunable optical
The exit end of wave device is connect by single-mode fiber jumper with the incidence end of 1 × 2 first fiber couplers；
First exit end of 1 × 2 first fiber couplers is connected by single-mode fiber jumper and the first Polarization Controller incidence end
It connects；First Polarization Controller exit end is connect by single-mode fiber jumper with the incidence end of the first high-speed electro-optic modulator；First
The exit end of high-speed electro-optic modulator is connect by single-mode fiber jumper with the incidence end of the first image intensifer；Microwave signal source
RF output end is connect by coaxial cable for high frequency with the rf inputs of the first high-speed electro-optic modulator；First image intensifer
Exit end is connect by single-mode fiber jumper with first incidence end of 2 × 1 fiber couplers；The outgoing of 2 × 1 fiber couplers
End is connected by the incidence end of single-mode fiber jumper and optical circulator；The reflection end of optical circulator and one end of sensor fibre connect
It connects；The other end of sensor fibre is connect with fiber reflector；
Second exit end of 1 × 2 first fiber couplers is connected by single-mode fiber jumper and the second Polarization Controller incidence end
It connects；Second Polarization Controller exit end is connect by single-mode fiber jumper with the incidence end of the second high-speed electro-optic modulator；Second
The exit end of high-speed electro-optic modulator is connect by single-mode fiber jumper with the incidence end of 1 × 2 second fiber couplers；Pulse hair
The signal output end of raw device is connect with the signal input part of the second high-speed electro-optic modulator；The first of 1 × 2 second fiber couplers
A exit end is connect by single-mode fiber jumper with the incidence end of the second image intensifer；The exit end of second image intensifer passes through list
Mode fiber wire jumper is connect with second incidence end of 2 × 1 fiber couplers；
Second exit end of 1 × 2 second fiber couplers is entered using a single-mode fiber jumper and the first photodetector
Penetrate end connection；
The exit end of optical circulator is connect by single-mode fiber jumper with the incidence end of third image intensifer；Third image intensifer
Exit end is connect with the incidence end of 1 × 2 third fiber coupler；
First exit end of 1 × 2 third fiber coupler passes through the incidence of single-mode fiber jumper and the second adjustable light wave-filter
End connection；Second exit end of 1 × 2 third fiber coupler is entered by single-mode fiber jumper and third adjustable light wave-filter
Penetrate end connection；The exit end of second adjustable light wave-filter is connected by the incidence end of single-mode fiber jumper and the second photodetector
It connects；The exit end of third adjustable light wave-filter is connect by single-mode fiber jumper with the incidence end of third photodetector；The
The signal output end of one photodetector and the first signal input part of data collecting card connect；The signal of second photodetector
The connection of the second signal input terminal of output end and data collecting card；The signal output end and data collecting card of third photodetector
Third signal input part connection；The signal output end of data collecting card and the signal input part of computer connect.
Based on the high-tension cable temp measuring method of the single-ended BOTDA of super continuum source, this method is being based on super continuum source
It is realized in the temperature measuring device for high-voltage cable of single-ended BOTDA, this method is realized using following steps:
A. the super continuum source signal that super continuum source issues first passes around cardiac wave in the generation of the first adjustable light wave-filter
The laser signal of a length of 1550nm；Laser signal is divided into two-way through 1 × 2 first fiber couplers: first via laser signal conduct
Optical signal is detected, the second road laser signal is as pump light signals；Detection optical signal first passes through the first Polarization Controller, makes laser
Signal reaches best polarization state；Using the first high-speed electro-optic modulator, and the sinusoidal signal modulation exported by microwave signal source,
So that detection optical SSB signal frequency shift amount close to Brillouin shift, then through the first image intensifer amplification after, through 2 × 1 light
Fine coupler and optical circulator conjunction beam enter sensor fibre after going in ring；Pump light signals first adjust through the second Polarization Controller inclined
Polarization state, then the pulse signal modulation exported through impulse generator, then through 1 × 2 second fiber couplers, the second image intensifer, 2
× 1 fiber coupler and optical circulator beam splitting, amplification enter sensor fibre together with detection optical signal after closing beam again, going in ring；
B. the pump light after pulse modulated enters sense light as pump light all the way by after 1 × 2 second fiber coupler beam splitting
Fibre, as described in step a, another way is converted to electric signal through the first photodetector as reference light, then through data collecting card
After acquisition, it is input in computer；
C. the detection optical SSB that the pump light signals and the fiber reflector through sensor fibre distal end being pulse modulation are reflected back
Signal, it is opposite at a certain position in sensor fibre and meets, when detection plain edge band signal frequency and pump light it is backward scattered
When penetrating light frequency difference and becoming smaller, with the back scattering optical coupling of pump light excited Brillouin will occur for detection plain edge band signal
Scattering, when frequency is exactly equal to Brillouin shift amount, detection plain edge band signal reaches maximum；Plain edge is detected in pumping light amplification
While band signal, pump light itself can also generate backward Rayleigh scattering optical signal；When after to Rayleigh scattering pump light and
Optical sideband is detected after the output of the exit end of optical circulator, then amplifies through third image intensifer, 1 × 2 third fiber coupler, divide
Shu Hou is filtered by the second adjustable light wave-filter and third adjustable light wave-filter respectively；It is filtered through the second adjustable light wave-filter
Backward Rayleigh scattering pump light out is converted to electric signal by the second photodetector and is input in data collecting card, can through third
The detection optical sideband that tuned light wave filter filters out is converted to electric signal by third photodetector and is input in data collecting card；It will
Collected data are input in computer, by calculating after pump light to the cross-correlation between Rayleigh scattering signal and reference signal
Function, so that it may determine the position signal of fiber optic temperature or strain, and the power by calculating detection plain edge band signal with
Relationship between modulating frequency can determine the brillouin gain spectrum of optical fiber, to realize to optical fiber any position high-tension cable
Temperature detected.
Sensor fibre is attached directly to the surface of high-tension cable or sensor fibre is placed in height when processing high-tension cable
Voltage cable buffer layer.
It is of the present invention a kind of single-ended based on super continuum source compared with existing high-tension cable temperature monitoring method
The temperature measuring device for high-voltage cable and method of BOTDA has the advantages that
1, compared with Raman distributed Fibre Optical Sensor thermometry, Brillouin scattering and Raman scattering are more sensitive to temperature.
Wherein the temperature sensitivity of Brillouin scattering is 0.3% DEG C-1, the temperature sensitivity of Raman scattering is 0.8% DEG C-1, but Brillouin dissipates
Intensity an order of magnitude higher than Raman scattering is penetrated, signal-to-noise ratio is relatively high.Therefore, the single-ended BOTDA skill of super continuum source is utilized
Art can obtain higher temperature resolution and farther transmission range.
2, the temperature measuring device for high-voltage cable and method (Chinese invention patent, CN of the relevant domain analysis of single-ended Brillouin light
105928634 A) select super-radiance light emitting diode as system source, although spatial resolution improves, it utilizes relevant
Domain analysis measurement, system distance are unable to satisfy engineering demand.The present invention uses super continuum source, and output power is higher, can
To overcome defect existing for 105928634 A of patent of invention CN.
3, compared with Brillouin light time domain system thermometry, the present invention is to be used as detection using based on super continuum source
Signal, due to the low coherence of super continuous spectrums, the high power of the laser of light source output can make detection range that can more lengthen, thus
Solve the problems, such as that distance sensing is limited.But also have with apart from unrelated spatial resolution, up to millimeter magnitude, even more
Height solves the problems, such as that traditional monitoring temperature measuring device for high-voltage cable has monitoring blind spot；System can continuously be obtained along detection
The metrical information of the dozens or even hundreds of kilometer of optical cable, wrong report and rate of failing to report substantially reduce, and are suitable for remote real time monitoring.
Detailed description of the invention
Fig. 1 is the temperature measuring device for high-voltage cable and method of the present invention based on the single-ended BOTDA of super continuum source
Structural schematic diagram.
In figure: 1- super continuum source, the first adjustable light wave-filter of 2-, first fiber coupler of 3-1 × 2,4- first
Polarization Controller, the first high-speed electro-optic modulator of 5-, 6- microwave signal source, the first image intensifer of 7-, the fiber coupler of 8-2 × 1,
9- optical circulator, 10- sensor fibre, 11- fiber reflector, the second Polarization Controller of 12-, the second high-speed electro-optic modulator of 13-,
The fiber coupler of 14- impulse generator, 15-1 × 2 second, the second image intensifer of 16-, 17- third image intensifer, 18-1 × 2
Three fiber couplers, the second adjustable light wave-filter of 19-, 20- third adjustable light wave-filter, the first photodetector of 21-,
The second photodetector of 22-, 23- third photodetector, 24- data collecting card, 25- computer, 26- high-tension cable.
Fig. 2 is that high-tension cable optical fiber is laid with cross-sectional structure figure.
Specific embodiment
Temperature measuring device for high-voltage cable based on the single-ended BOTDA of super continuum source includes that super continuum source 1, first is adjustable
Humorous 2,1 × 2 first fiber coupler 3 of optical filter, the first Polarization Controller 4, the first high-speed electro-optic modulator 5, microwave signal
Source 6, the first image intensifer 7,2 × 1 fiber couplers 8, optical circulator 9, sensor fibre 10, fiber reflector 11, second polarize
Controller 12, the second high-speed electro-optic modulator 13,14,1 × 2 second fiber coupler 15 of impulse generator, the second image intensifer
16, third image intensifer 17,1 × 2 third fiber coupler 18, the second adjustable light wave-filter 19, the filtering of third tunable optical
Device 20, the first photodetector 21, the second photodetector 22, third photodetector 23, data collecting card 24, computer
25, high-tension cable 26；
Wherein, the exit end of super continuum source 1 is connect with the incidence end of the first adjustable light wave-filter 2；First tunable optical
The exit end of filter 2 is connect by single-mode fiber jumper with the incidence end of 1 × 2 first fiber couplers 3；
First exit end of 1 × 2 first fiber couplers 3 passes through 4 incidence end of single-mode fiber jumper and the first Polarization Controller
Connection；First Polarization Controller, 4 exit end is connect by single-mode fiber jumper with the incidence end of the first high-speed electro-optic modulator 5；
The exit end of first high-speed electro-optic modulator 5 is connect by single-mode fiber jumper with the incidence end of the first image intensifer 7；Microwave letter
The RF output end in number source 6 is connect by coaxial cable for high frequency with the rf inputs of the first high-speed electro-optic modulator 5；First light
The exit end of amplifier 7 is connect by single-mode fiber jumper with first incidence end of 2 × 1 fiber couplers 8；2 × 1 optical fiber couplings
The exit end of clutch 8 is connect by single-mode fiber jumper with the incidence end of optical circulator 9；The reflection end and sensing of optical circulator 9
One end of optical fiber 10 connects；The other end of sensor fibre 10 is connect with fiber reflector 11；
Second exit end of 1 × 2 first fiber couplers 3 passes through 12 incidence end of single-mode fiber jumper and the second Polarization Controller
Connection；Second Polarization Controller, 12 exit end is connected by the incidence end of single-mode fiber jumper and the second high-speed electro-optic modulator 13
It connects；The exit end of second high-speed electro-optic modulator 13 passes through the incidence end of single-mode fiber jumper and 1 × 2 second fiber couplers 15
Connection；The signal output end of impulse generator 14 is connect with the signal input part of the second high-speed electro-optic modulator 13；1 × 2 second
First exit end of fiber coupler 15 is connect by single-mode fiber jumper with the incidence end of the second image intensifer 16；Second light
The exit end of amplifier 16 is connect by single-mode fiber jumper with second incidence end of 2 × 1 fiber couplers 8；
Second exit end of 1 × 2 second fiber couplers 15 utilizes a single-mode fiber jumper and the first photodetector 21
Incidence end connection；
The exit end of optical circulator 9 is connect by single-mode fiber jumper with the incidence end of third image intensifer 17；Third light amplification
The exit end of device 17 is connect with the incidence end of 1 × 2 third fiber coupler 18；
First exit end of 1 × 2 third fiber coupler 18 passes through single-mode fiber jumper and the second adjustable light wave-filter 19
Incidence end connection；Second exit end of 1 × 2 third fiber coupler 18 is filtered by single-mode fiber jumper and third tunable optical
The incidence end of device 20 connects；The exit end of second adjustable light wave-filter 19 passes through single-mode fiber jumper and the second photodetector
22 incidence end connection；The exit end of third adjustable light wave-filter 20 passes through single-mode fiber jumper and third photodetector 23
Incidence end connection；The signal output end of first photodetector 21 is connect with the first signal input part of data collecting card 24；
The signal output end of second photodetector 22 is connect with the second signal input terminal of data collecting card 24；Third photodetector
23 signal output end is connect with the third signal input part of data collecting card 24；The signal output end and meter of data collecting card 24
The signal input part of calculation machine 25 connects.
High-tension cable thermometric monitoring method based on the single-ended BOTDA of super continuum source, this method are being based on super continuous spectrums
It is realized in the temperature measuring device for high-voltage cable of the single-ended BOTDA of light source, this method is realized using following steps:
A. the super continuum source signal that super continuum source 1 issues first passes around 2 generation center of the first adjustable light wave-filter
Wavelength is the laser signal of 1550nm；Light source forms super continuum source by quasi c. w. Raman fiber lasers and true wave fiber
1；The super continuum source signal that super continuum source 1 issues first passes around the first adjustable light wave-filter 2 and generates central wavelength
For the laser signal of 1550nm；Super continuous spectrums optical signal divides through 1 × 2 first fiber couplers 3 for two-way: first via chaotic laser light
Signal is as detection optical signal, and the second road chaotic laser light signal is as pump light signals；Detection optical signal first passes through the first polarization
Controller 4 makes laser signal reach best polarization state；Using the first high-speed electro-optic modulator 5, and it is defeated by microwave signal source 6
Sinusoidal signal modulation out so that detection optical SSB signal frequency shift amount close to Brillouin shift, then through the first light amplification
After device 7 amplifies, enter sensor fibre 10 after 2 × 1 fiber couplers 8 and optical circulator 9 close beam, go in ring；Pump light signals are first
Polarization state is adjusted through the second Polarization Controller 12, then the pulse signal modulation exported through impulse generator 14, then through 1 × 2 the
Two fiber couplers 15, amplification, close beam again, go in ring at 9 beam splitting of second image intensifer 16,2 × 1 fiber couplers 8 and optical circulator
Enter sensor fibre 10 together with detection optical signal afterwards；
B. the pump light after pulse modulated enters sensing as pump light all the way by after 1 × 2 second fiber coupler, 15 beam splitting
Optical fiber 10, as described in step a, another way is converted to electric signal through the first photodetector 21 as reference light, then through data
After capture card 24 acquires, it is input in computer 25；
C. the detection light list that the pump light signals and the fiber reflector 11 through 10 distal end of sensor fibre being pulse modulation are reflected back
Sideband signals, it is opposite at a certain position in sensor fibre 10 and meets, when the frequency and pump light for detecting plain edge band signal
When rear orientation light frequency difference becomes smaller, detection plain edge band signal will be excited with the back scattering optical coupling of pump light
Brillouin scattering, when frequency is exactly equal to Brillouin shift amount, detection plain edge band signal reaches maximum；It is visited in pumping light amplification
While surveying plain edge band signal, pump light itself can also generate backward Rayleigh scattering optical signal；When after to Rayleigh scattering pump
Pu light and detection optical sideband are after the output of the exit end of circulator 9, then through third image intensifer 17,1 × 2 third fiber coupler
After 18 amplifications, beam splitting, filtered respectively by the second adjustable light wave-filter 19 and third adjustable light wave-filter 20；It is adjustable through second
The backward Rayleigh scattering pump light that humorous optical filter 19 filters out is converted to electric signal by the second photodetector 22 and is input to data
In capture card 24, the detection optical sideband filtered out through third adjustable light wave-filter 20 is converted to telecommunications by third photodetector 23
It number is input in data collecting card 24；Collected data are input in computer 25, Xiang Ruili after calculating pump light is passed through
The cross-correlation function of scattered signal and reference signal, so that it may determine the position signal of fiber optic temperature or strain, at the same time,
The relationship between power and modulating frequency by calculating detection plain edge band signal can determine the brillouin gain spectrum of optical fiber, from
And obtain the temperature value of high-tension cable any position.
Sensor fibre 10 is attached directly to the surface of high-tension cable 26, or when processing high-tension cable 26, by sense light
Fibre 10 is placed in high-tension cable buffer layer.
When it is implemented, light source forms super continuum source 1 by quasi c. w. Raman fiber lasers and true wave fiber, warp
The first adjustable light wave-filter 2 filtering output laser is crossed, laser center wavelength can harmony.1 × 2 first fiber couplers 3,1 × 2
Second fiber coupler 15,1 × 2 third fiber coupler 18,2 × 1 fiber couplers 8 coupling ratio be 50:50.First high speed
Electrooptic modulator 5, the second high-speed electro-optic modulator 13 use LN81S-FC type intensity modulator.Microwave signal source 6 uses
Model-SNP1012-520-01 type microwave signal source.Impulse generator 14 uses HP 8015A type pulse signal generator.The
One image intensifer 7, the second image intensifer 16, third image intensifer 17 use erbium-doped fiber amplifier.The filtering of first tunable optical
Device 2, the second adjustable light wave-filter 19, third adjustable light wave-filter 20 are tunable using XTM-50 type wavelength and bandwidth first
Optical filter.Sensor fibre 10 uses G652 single mode optical fiber or G655 single mode optical fiber, and the length is 300km.
Sense light in temperature measuring device for high-voltage cable and method of the present invention based on the single-ended BOTDA of super continuum source
There are two types of laying methods for 10 tool of fibre, the first laying method is that sensor fibre is directly attached to high-tension cable surface, such as Fig. 1 institute
Show, second of laying method is in process, sensor fibre 10 to be placed in high-tension cable buffer layer, two methods are each
It is advantageous, depending on actual conditions.
Claims (3)
1. the temperature measuring device for high-voltage cable based on the single-ended BOTDA of super continuum source, it is characterised in that: including super continuum source
(1), the first adjustable light wave-filter (2), 1 × 2 first fiber couplers (3), the first Polarization Controller (4), the first high speed electricity
Optical modulator (5), microwave signal source (6), the first image intensifer (7), 2 × 1 fiber couplers (8), optical circulator (9), sensing
Optical fiber (10), fiber reflector (11), the second Polarization Controller (12), the second high-speed electro-optic modulator (13), impulse generator
(14), 1 × 2 second fiber couplers (15), the second image intensifer (16), third image intensifer (17), 1 × 2 third optical fiber coupling
Clutch (18), the second adjustable light wave-filter (19), third adjustable light wave-filter (20), the first photodetector (21),
Two photodetectors (22), third photodetector (23), data collecting card (24), computer (25), high-tension cable (26)；
Wherein, the exit end of super continuum source (1) is connect with the incidence end of the first adjustable light wave-filter (2)；First is adjustable
The exit end of humorous optical filter (2) is connect by single-mode fiber jumper with the incidence end of 1 × 2 first fiber couplers (3)；
First exit end of 1 × 2 first fiber couplers (3) is entered by single-mode fiber jumper with the first Polarization Controller (4)
Penetrate end connection；First Polarization Controller (4) exit end passes through the incidence of single-mode fiber jumper and the first high-speed electro-optic modulator (5)
End connection；The exit end of first high-speed electro-optic modulator (5) passes through the incidence end of single-mode fiber jumper and the first image intensifer (7)
Connection；The RF output end of microwave signal source (6) is defeated by the radio frequency of coaxial cable for high frequency and the first high-speed electro-optic modulator (5)
Enter end connection；The exit end of first image intensifer (7) is entered by first of single-mode fiber jumper and 2 × 1 fiber couplers (8)
Penetrate end connection；The exit end of 2 × 1 fiber couplers (8) is connect by single-mode fiber jumper with the incidence end of optical circulator (9)；
The reflection end of optical circulator (9) is connect with one end of sensor fibre (10)；The other end and fiber reflector of sensor fibre (10)
(11) it connects；
Second exit end of 1 × 2 first fiber couplers (3) is entered by single-mode fiber jumper with the second Polarization Controller (12)
Penetrate end connection；Second Polarization Controller (12) exit end is entered by single-mode fiber jumper and the second high-speed electro-optic modulator (13)
Penetrate end connection；The exit end of second high-speed electro-optic modulator (13) passes through single-mode fiber jumper and 1 × 2 second fiber couplers
(15) incidence end connection；The signal output end of impulse generator (14) and the signal of the second high-speed electro-optic modulator (13) input
End connection；First exit end of 1 × 2 second fiber couplers (15) passes through single-mode fiber jumper and the second image intensifer (16)
Incidence end connection；The exit end of second image intensifer (16) pass through single-mode fiber jumper and 2 × 1 fiber couplers (8) the
Two incidence end connections；
Second exit end of 1 × 2 second fiber couplers (15) utilizes a single-mode fiber jumper and the first photodetector
(21) incidence end connection；
The exit end of optical circulator (9) is connect by single-mode fiber jumper with the incidence end of third image intensifer (17)；Third light
The exit end of amplifier (17) is connect with the incidence end of 1 × 2 third fiber coupler (18)；
First exit end of 1 × 2 third fiber coupler (18) passes through single-mode fiber jumper and the second adjustable light wave-filter
(19) incidence end connection；Second exit end of 1 × 2 third fiber coupler (18) is adjustable by single-mode fiber jumper and third
The incidence end of humorous optical filter (20) connects；The exit end of second adjustable light wave-filter (19) passes through single-mode fiber jumper and the
The incidence end of two photodetectors (22) connects；The exit end of third adjustable light wave-filter (20) by single-mode fiber jumper with
The incidence end of third photodetector (23) connects；The signal output end of first photodetector (21) and data collecting card (24)
The first signal input part connection；The signal output end of second photodetector (22) and the second signal of data collecting card (24)
Input terminal connection；The signal output end of third photodetector (23) and the third signal input part of data collecting card (24) connect
It connects；The signal output end of data collecting card (24) is connect with the signal input part of computer (25).
2. this method is in base as described in claim 1 based on the high-tension cable temp measuring method of the single-ended BOTDA of super continuum source
It is realized in the temperature measuring device for high-voltage cable of the single-ended BOTDA of super continuum source, which is characterized in that this method uses following steps
It realizes:
A. the super continuum source signal that super continuum source (1) issues first passes around the first adjustable light wave-filter (2) generation
Central wavelength is the laser signal of 1550nm；Super continuous spectrums optical signal is divided into two-way through 1 × 2 first fiber couplers (3): first
Road laser signal is as detection optical signal, and the second road laser signal is as pump light signals；Detection optical signal first passes through first partially
It shakes controller (4), laser signal is made to be optimal polarization state；Using the first high-speed electro-optic modulator (5), and by microwave signal
Source (6) output sinusoidal signal modulation so that detection optical SSB signal frequency shift amount close to Brillouin shift, then through first
After image intensifer (7) amplification, enter sensor fibre after 2 × 1 fiber couplers (8) and optical circulator (9) close beam, go in ring
(10)；Pump light signals first adjust polarization state, then the pulse exported through impulse generator (14) through the second Polarization Controller (12)
Signal modulation, then through 1 × 2 second fiber couplers (15), the second image intensifer (16), 2 × 1 fiber couplers (8) and light
Circulator (9) beam splitting, amplification enters sensor fibre (10) together with detection optical signal after closing beam again, going in ring；
B. the pump light after pulse modulated enters biography as pump light all the way by after 1 × 2 second fiber coupler (15) beam splitting
Photosensitive fibre (10), as described in step a, another way is converted to electric signal through the first photodetector (21) as reference light, then
After data collecting card (24) acquisition, it is input in computer (25)；
C. the detection that the pump light signals and the fiber reflector (11) through sensor fibre (10) end being pulse modulation are reflected back
Optical SSB signal is met in opposite directions at a certain position in sensor fibre (10), when the frequency and pump of detection plain edge band signal
When the rear orientation light frequency difference of Pu light becomes smaller, detection plain edge band signal will be sent out with the back scattering optical coupling of pump light
Raw stimulated Brillouin scattering, when frequency is exactly equal to Brillouin shift amount, detection plain edge band signal reaches maximum；In pump light
While amplification detection plain edge band signal, pump light itself can also generate backward Rayleigh scattering optical signal；When after to Rayleigh dissipate
The pump light penetrated and detection optical sideband are after the output of the exit end of optical circulator (9), then through third image intensifer (17), 1 × 2 the
After three fiber couplers (18) amplification, beam splitting, respectively by the second adjustable light wave-filter (19) and third adjustable light wave-filter
(20) it filters；The backward Rayleigh scattering pump light filtered out through the second adjustable light wave-filter (19) is by the second photodetector (22)
Electric signal is converted to be input in data collecting card (24), the detection optical sideband filtered out through third adjustable light wave-filter (20) by
Third photodetector (23) is converted to electric signal and is input in data collecting card (24)；Collected data are input to calculating
In machine (25), computing cross-correlation will be carried out to Rayleigh scattering signal and reference signal after pump light, that is, can determine that fiber optic temperature
Position signal, at the same time, by calculate detection plain edge band signal power and modulating frequency between relationship can obtain
The brillouin gain spectrum of optical fiber detects the temperature of optical fiber any position high-tension cable to realize.
3. the high-tension cable temp measuring method according to claim 2 based on the single-ended BOTDA of super continuum source, feature exist
In sensor fibre (10) is attached directly to the surface of high-tension cable (26), or when processing high-tension cable (26), by sense light
Fine (10) are placed in high-tension cable buffer layer.
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