CN107990997A - A kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems and method - Google Patents
A kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems and method Download PDFInfo
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- CN107990997A CN107990997A CN201711157684.6A CN201711157684A CN107990997A CN 107990997 A CN107990997 A CN 107990997A CN 201711157684 A CN201711157684 A CN 201711157684A CN 107990997 A CN107990997 A CN 107990997A
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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
A kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems and method, belong to technical field of optical fiber sensing.The system includes computer, multi-channel synchronous frequency sweep lock-in amplifier, light source driving circuit, short wavelength semiconductor laser, long wavelength semiconductor laser, optical fiber wave multiplexer, fiber coupler, Raman wavelength division multiplexer, optical detection module and temperature-measuring optical fiber.The two-way different frequency signals that multi-channel synchronous frequency sweep lock-in amplifier produces respectively are carried out at the same time two semiconductor lasers step frequency modulation, double frequency cross-correlation test device synchronizes measurement to the backward Raman scattering light of two kinds of different frequencies, realizes that quick self-correcting districution temperature demodulates using incoherent optical frequency domain reflection technology.The present invention can complete the optical fiber back scattering curved measurement of double light sources in a measurement period, time of measuring than conventional method reduces half, and the fiber optic Distributed Temperature measurement for low cost, high accuracy and high reliability provides a kind of technical solution of great competitiveness.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, is related to a kind of double light source self-correction formula fiber optic Distributed Temperatures and quickly measures
System and method.
Background technology
Fiber optic distributed temperature sensor (DTS) is to scatter light according to the backward anti-Stokes Raman of laser in a fiber
Intensity calculate fiber optic temperature, belong to a kind of intensity modulation type method for sensing, although being dissipated by the Stokes of measurement at the same time
Penetrate luminous intensity and certain compensation has been carried out to the intensity of light source and optical transmission loss, but due to Stokes and anti-Stokes scattering
Channel spacing is in hundred nanometer scales, if fiber transmission attenuation can not occur in two kinds of scattering wave bands after system does temperature calibration
The change of ratio, then temperature measurement result error just occurs.OH radical ions and hydrogen atom relatively hold under high temperature or hyperbaric environment
Easily enter fibre core through coat and produce a degree of added losses, make essences of the fiber raman scattering DTS after long-term work
Degree is remarkably decreased, until measured temperature distributed data Enlarging-Errors to not having use value completely.Accordingly, it is capable to no suppression high temperature is high
The drift of DTS is depressed, it is to determine the long-term availability in its high temperature oil gas well to improve the long-time stability of DTS and measurement accuracy
It is crucial.
In order to eliminate distributed temperaturing error caused by optical transmission loss change, both-end penalty method and double Light Source Compensation methods
It is suggested in succession Deng automatic correcting method.Document Fernandez A F, Rodeghiero P, Brichard B, et
al.Radiation-tolerant Raman distributed temperature monitoring system for
large nuclear infrastructures[J].Ieee Transactions on Nuclear Science,2005.52
(6):2689-2694 uses both-end penalty method, and the Raman scattering for measuring sensor fibre both ends respectively by photoswitch switching is distributed
Curve, reduces the influence that fibre loss measures DTS.Document Hwang D, Yoon D J, Kwon I B, et al.Novel
auto-correction method in a fiber-optic distributed-temperature sensor using
reflected anti-Stokes Raman scattering[J].Optics Express,2010.18(10):9747-
9754 propose to realize self-correction with the anti-Stokes Raman scattering light of reflection, and the laser of the speculum reflection of optical fiber connector produces
Backward Raman scattering light be reflected by a reflector again after by optical fiber incide DTS hosts, using similar to both-end penalty method
Self-correction can be achieved in temperature demodulation method, but the increase of speculum has decayed the energy of pump light and anti-Stokes optical signal
Amount, reduces the Measurement Resolution of system.Document Suh K, Lee C.Auto-correction method for
differential attenuation in a fiber-optic distributed-temperature sensor[J]
.Optics Letters,2008.33(16):1845-1847 proposes double Light Source Compensation methods, using the light of two different wave lengths
Source, the centre wavelength of first light source is equal with the stokes scattering wavelength of second light source, the middle cardiac wave of second light source
Length is equal with the anti-Stokes scattering wavelength of first light source, is reviewed one's lessons by oneself so as to fulfill to loss difference change in temperature demodulation
Just, this method has the engineering practical value of higher.However, both-end penalty method add sensor in-site installation complexity and
Difficulty, although double Light Source Compensation methods can overcome the problem, the switch operating of light source, makes the time of measuring of system add 2
Times.Thus, the formal fiber optic Distributed Temperature Fast measurement system of self-correcting that a kind of double light sources of design work at the same time has more extensive
Application value.
The content of the invention
It is an object of the invention to propose a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems and method,
Aim to solve the problem that the problem of switching of conventional method medium wavelength causes time of measuring to increase by twice, and reduce optical path loss, improve system
Performance indicator is fibre optical sensor in the space of the application extension bigger in the fields such as oil gas well mining.
Technical scheme：
A kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems, including computer 1, multi-channel synchronous frequency sweep
Lock-in amplifier 2, light source driving circuit 3, short wavelength semiconductor laser 4, long wavelength semiconductor laser 5, optical fiber wave multiplexer
6th, fiber coupler 7, Raman wavelength division multiplexer 8, optical detection module 9 and temperature-measuring optical fiber 10；
The computer 1 sends instruction to multi-channel synchronous frequency sweep lock-in amplifier 2；The light source driving circuit 3
After receiving the two-way modulated signal that multi-channel synchronous frequency sweep lock-in amplifier 2 produces, short wavelength semiconductor laser 4 is driven respectively
With long wavelength semiconductor laser 5；The short wavelength semiconductor laser 4 and the output light of long wavelength semiconductor laser 5
After optical fiber wave multiplexer 6, merging is input to fiber coupler 7, and the small part light separated in fiber coupler 7 is used as to enter with reference to light
Optical detection module 9 is mapped to, most of light is incided after being reflected by Raman wavelength division multiplexer 8 in temperature-measuring optical fiber 10；The thermometric
The backward Raman scattering light produced in optical fiber 10 incides optical detection module 9 after Raman wavelength division multiplexer 8 filters out；The survey
After the backward Rayleigh scattering light produced in warm optical fiber 10 is reflected by Raman wavelength division multiplexer 8, the portion that is separated by fiber coupler 7
Optical detection module 9 is incided in light splitting；The optical detection module 9 will receive optical signal be converted into being input to after electric signal it is more logical
Road synchronization frequency sweep lock-in amplifier 2；The multi-channel synchronous frequency sweep lock-in amplifier 2 in photosignal at the same time include two
The small-signal of kind modulating frequency demodulate at the same time；The computer 1 exports multi-channel synchronous frequency sweep lock-in amplifier 2
Signal measurements be acquired, handle and show.
A kind of double light source self-correction formula fiber optic Distributed Temperature method for fast measuring, using incoherent optical frequency domain reflection technology,
With the carrying out different frequencies intensity modulated to two light sources at the same time, the backward Raman scattering through cross-correlation test algorithm to two kinds of frequencies
Light demodulate at the same time, realizes the high accuracy to districution temperature and quick measurement；Comprise the following steps that：
Computer 1 sends instruction to multi-channel synchronous frequency sweep lock-in amplifier 2 first；Light source driving circuit 3 receives more logical
The step frequency swept modulated signal for the two-way different frequency that road synchronization frequency sweep lock-in amplifier 2 produces drives shortwave at the same time respectively
Long semiconductor laser 4 and long wavelength semiconductor laser 5；Then short wavelength semiconductor laser 4 and long wavelength semiconductor swash
The output light of light device 5 merges after optical fiber wave multiplexer 6 is input to fiber coupler 7, and the small part light separated is used as to enter with reference to light
Optical detection module 9 is mapped to, most of light is incided after being reflected by Raman wavelength division multiplexer 8 in temperature-measuring optical fiber 10；Temperature-measuring optical fiber 10
The backward Raman scattering light of middle generation incides optical detection module 9 after Raman wavelength division multiplexer 8 filters out；Temperature-measuring optical fiber 10 at the same time
After the backward Rayleigh scattering light of middle generation is reflected by Raman wavelength division multiplexer 8, the part light separated after fiber coupler 7 enters
It is mapped to optical detection module 9；The reference light received, Raman diffused light and Rayleigh scattering light are converted into telecommunications by optical detection module 9
Number it is input to multi-channel synchronous frequency sweep lock-in amplifier 2；Multi-channel synchronous frequency sweep lock-in amplifier 2 to wrapping at the same time in photosignal
After the small-signal of the two kinds of modulating frequencies contained is carried out while demodulated, the measurement result after all frequency scannings is transferred to calculating
Machine 1；Last computer 1 recovers two Rayleigh scattering curves and two backward Raman scattering songs by inversefouriertransform algorithm
After line, carry out the demodulation of self-correcting districution temperature and show.
The multi-channel synchronous frequency sweep lock-in amplifier 2 has the function of step frequency scanning survey, frequency sweeping ranges
For 1kHz-100MHz.
The multi-channel synchronous frequency sweep lock-in amplifier 2 has the function of that two frequencies measure at the same time, i.e., single input is logical
The amplitude and phase of two frequency signals in road can be measured simultaneously out, and the cross jammings of two frequency measurements is less than-
60dB。
The central wavelength difference of the short wavelength semiconductor laser 4 and the long wavelength semiconductor laser 5 is
100nm, makes the Stokes Raman of the short wavelength semiconductor laser 4 scatter light and the long wavelength semiconductor laser 5
Anti-Stokes Raman scattering light peak wavelength it is equal.
The optical fiber wave multiplexer 6 is a kind of optical fibre wavelength division multiplexer.
The splitting ratio of the fiber coupler 7 is 10:90 to 50:50.
The optical detection module 9 is amplified by 2 PIN photodiodes, 1 avalanche photodide and low noise mutual conductance
Circuit forms.
The principle of the present invention is as follows：Positioning to the locus of backward Raman (Rayleigh) scattering light in optical fiber uses non-phase
Dry probe beam deflation (IOFDR) technology, measures while realizing double light sources.The two of multi-channel synchronous frequency sweep lock-in amplifier generation
Road different frequency signals carry out step frequency modulation to two semiconductor lasers respectively, and two laser light sources worked at the same time enter
Backward Raman (Rayleigh) the scattering light that two kinds of respective frequencies are produced in temperature-measuring optical fiber is mapped to, multi-channel synchronous is input in the same time and sweeps
The photosignal comprising two kinds of different frequencies of frequency lock-in amplifier and two inside multi-channel synchronous frequency sweep lock-in amplifier
The reference signal of different frequency is carried out at the same time computing cross-correlation, after completing to frequency scan, you can calculate two light sources respectively
The frequency response of the Raman diffused light of generation.Computer recovers two backward Raman scattering songs by inversefouriertransform algorithm
After line and two backward Raman scattering curves, a self-correcting districution temperature demodulation is completed.
Beneficial effects of the present invention：One measurement period can complete the optical fiber back scattering curved measurement of double light sources, than
The time of measuring reduction half of traditional double light source self-correction methods.Small-power continuous semiconductor laser substitutes the double light sources of tradition
High peak power pulse light source in DTS, since the development of semiconductor laser reaches its maturity, alternative wavelength is very rich
Richness, makes the implementation of the present invention very easy, and reduces system cost and complexity.The present invention is low cost, high accuracy and height
The fiber optic Distributed Temperature measurement of reliability provides a kind of technical solution of great competitiveness.
Brief description of the drawings
Attached drawing 1 is the structure diagram of the present invention.
Attached drawing 2 is double modulation of source frequency change schematic diagrams of single measurement.
Attached drawing 3 is the principle schematic that triple channel steps in synchronization frequency scanning formula lock-in amplifier.
Attached drawing 4 is the amplitude-frequency response of the double light source Raman rear orientation lights measured at the same time.
In figure：1 computer；2 multi-channel synchronous frequency sweep lock-in amplifiers；3 light source driving circuits；
4 short wavelength semiconductor lasers；5 long wavelength semiconductor lasers；6 optical fiber wave multiplexers；
7 fiber couplers；8 Raman wavelength division multiplexers；9 optical detection modules；10 temperature-measuring optical fibers；
The modulating frequency of 11 short wavelength semiconductor lasers；The modulating frequency of 12 long wavelength semiconductor lasers；
13 field programmable gate arrays；14 Raman scattering optical channel double frequency cross-correlation test devices；
15 Rayleigh scattering optical channel double frequency cross-correlation test devices；16 refer to optical channel double frequency cross-correlation test device；
17 short wavelength light source modulated digital signal generators；18 long wavelength's light source modulated digital signal generators；
19 digital communication controllers；20 communication interfaces；21 Raman scattering photosignal input interfaces；
22 Rayleigh scattering photosignal input interfaces；23 refer to photosignal input interface；
24 short wavelength light source modulated signal output interfaces；25 long wavelength's light source modulated signal output interfaces；
26 Raman scattering photosignal analog-digital converters；27 Rayleigh scattering photosignal analog-digital converters；
28 refer to photosignal analog-digital converter；29 short wavelength light source modulated signal digital analog converters；
30 long wavelength's light source modulated signal digital analog converters；
The amplitude-frequency response for the Stokes Raman scattering light that 31 short wavelength lasers produce；
The amplitude-frequency response for the anti-Stokes Raman scattering light that 32 long wavelength lasers produce.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with technical solution and attached drawing.
A kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems, mainly include computer 1, multi-channel synchronous
Frequency sweep lock-in amplifier 2, light source driving circuit 3, short wavelength semiconductor laser 4, long wavelength semiconductor laser 5, optical fiber close
Ripple device 6, fiber coupler 7, Raman wavelength division multiplexer 8, optical detection module 9 and temperature-measuring optical fiber 10.
Computer 1 sends instruction to multi-channel synchronous frequency sweep lock-in amplifier 2；It is same that light source driving circuit 3 receives multichannel
The step frequency swept modulated signal for the two-way different frequency that step frequency sweep lock-in amplifier 2 produces drives short wavelength at the same time respectively
Semiconductor laser 4 and long wavelength semiconductor laser 5；Short wavelength semiconductor laser 4 and long wavelength semiconductor laser 5
Output light merges after optical fiber wave multiplexer 6 is input to fiber coupler 7, and the small part light separated is used as incides light spy with reference to light
Module 9 is surveyed, most of light is incided after being reflected by Raman wavelength division multiplexer 8 in temperature-measuring optical fiber 10；Produced in temperature-measuring optical fiber 10
Backward Raman scattering light incides optical detection module 9 after Raman wavelength division multiplexer 8 filters out；What is produced in temperature-measuring optical fiber 10 is backward
After Rayleigh scattering light is reflected by Raman wavelength division multiplexer 8, the part light separated after fiber coupler 7 incides optical detection mould
Block 9；Optical detection module 9 by the reference light received, Raman diffused light and Rayleigh scattering light be converted into electric signal be input to it is more logical
Road synchronization frequency sweep lock-in amplifier 2；Multi-channel synchronous frequency sweep lock-in amplifier 2 measures reference light, Rayleigh scattering light and drawing at the same time
After the amplitude and phase of two frequency signals in graceful scattering light, amplitude and phase that cross correlation algorithm is calculated are transmitted to meter
Calculation machine 1；Computer 1 is demodulated and shown according to inversefouriertransform algorithm and the high-precision districution temperature of automatic correcting method realization.
Wherein, multi-channel synchronous frequency sweep lock-in amplifier 2 be a kind of triple channel step in synchronization frequency scanning formula lock mutually amplify
Device, frequency measurement scope are 1kHz-100MHz.The most higher modulation current that light source driving circuit 3 is is 1A, bandwidth 100MHz.
Short wavelength semiconductor laser 4 is the semiconductor laser diode that centre wavelength is 974nm.Long wavelength semiconductor swashs
Light device 5 is the semiconductor laser diode that centre wavelength is 1064nm.Optical fiber wave multiplexer 6 is the wavelength-division that transmission peak wavelength is 1064nm
Multiplexer.The splitting ratio of fiber coupler 7 is 10:90.The centre wavelength of 8 transmission end of Raman wavelength division multiplexer is 1020nm, band
Width is 20nm.Optical detection module 9 is by 2 PIN photodiodes, 1 avalanche photodide and low noise mutual conductance amplifying circuit
Composition, bandwidth 100MHz.Temperature-measuring optical fiber 10 uses 50/125 μm of multimode sensor fibre.
Attached drawing 2 is double modulation of source frequency change schematic diagrams of single measurement.The modulation frequency of short wavelength semiconductor laser
The excursion of rate 11 and the modulating frequency of long wavelength semiconductor laser 12 is all 50kHz-50MHz, and step frequency is
50kHz；The difference on the frequency of the modulating frequency 11 of short wavelength semiconductor laser and the modulating frequency 12 of long wavelength semiconductor laser
For 50kHz.
Attached drawing 3 is the principle schematic that triple channel steps in synchronization frequency scanning formula lock-in amplifier.Field-programmable gate array
Digital communication controllers 19 in row 13 receive the control instruction of communication interface 20；Short wavelength in field programmable gate array 13
Modulation of source digital signal generator 17 and long wavelength's light source modulated digital signal generator 18 produce two-way different modulating at the same time
The step frequency modulated signal of frequency, respectively by short wavelength light source modulated signal output interface 24 and long wavelength's light source modulated signal
Output interface 25 exports；Raman scattering photosignal input interface 21, Rayleigh scattering photosignal input interface 22 and reference light
Electric signal input interface 23 is respectively connected to Raman scattering photosignal, Rayleigh scattering photosignal and the ginseng of optical detection module output
After examining photosignal, respectively by Raman scattering photosignal analog-digital converter 26, Rayleigh scattering photosignal analog-digital converter 27
Digital signal is converted to with reference to photosignal analog-digital converter 28；Field programmable gate array 13 gather digital signal and
The difference that short wavelength light source modulated digital signal generator 17 and long wavelength's light source modulated digital signal generator 18 produce respectively
The reference sine/cosine signals of frequency, while it is input to Raman scattering optical channel double frequency cross-correlation test device 14, Rayleigh scattering light
The inspection of bifrequency synchronization cross-correlation is carried out in passage double frequency cross-correlation test device 15 and reference optical channel double frequency cross-correlation test device 16
Survey and calculate；The amplitude and phase value calculated is transferred to communication interface 20 by digital communication controllers 19.
Attached drawing 4 is the amplitude-frequency response of the double light source Raman rear orientation lights measured at the same time.Stokes Raman scattering light
Amplitude-frequency response 31 is short wavelength's semiconductor laser 4 under the modulation of step frequency electric signal, multi-channel synchronous frequency sweep lock-in amplifier 2
The amplitude of the frequency response of the Stokes Raman scattering light produced in the optical fiber of measurement；Anti-Stokes Raman scatters the width of light
It is long wavelength semiconductor laser 5 under different step frequency electric signal modulation that frequency response, which answers 32, and multi-channel synchronous frequency sweep lock is mutually put
The amplitude of the frequency response of the anti-Stokes Raman scattering light produced in the optical fiber that big device 2 measures.
The foregoing is merely the preferred embodiment of the present invention, is not intended to limit the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems, it is characterised in that including computer (1), more
Channel Synchronous frequency sweep lock-in amplifier (2), light source driving circuit (3), short wavelength semiconductor laser (4), long wavelength semiconductor
Laser (5), optical fiber wave multiplexer (6), fiber coupler (7), Raman wavelength division multiplexer (8), optical detection module (9) and temperature measuring optical
Fine (10)；
The computer (1) sends instruction to multi-channel synchronous frequency sweep lock-in amplifier (2)；The light source driving circuit
(3) after receiving the two-way modulated signal that multi-channel synchronous frequency sweep lock-in amplifier (2) produces, short wavelength's semiconductor is driven to swash respectively
Light device (4) and long wavelength semiconductor laser (5)；The short wavelength semiconductor laser (4) and long wavelength semiconductor laser
For the output light of device (5) after optical fiber wave multiplexer (6), merging is input to fiber coupler (7), is separated in fiber coupler (7)
Small part light is used as incides optical detection module (9) with reference to light, and most of light incides after being reflected by Raman wavelength division multiplexer (8)
In temperature-measuring optical fiber (10)；The backward Raman scattering light produced in the temperature-measuring optical fiber (10) is filtered through Raman wavelength division multiplexer (8)
Optical detection module (9) is incided after going out；The backward Rayleigh scattering light produced in the temperature-measuring optical fiber (10) is answered by Raman wavelength-division
After being reflected with device (8), the part light separated by fiber coupler (7) incides optical detection module (9)；The optical detection mould
Block (9) will receive after optical signal is converted into electric signal and be input to multi-channel synchronous frequency sweep lock-in amplifier (2)；Described is more logical
The small-signal of two kind modulating frequencies of the road synchronization frequency sweep lock-in amplifier (2) to being included at the same time in photosignal is carried out while solved
Adjust；The signal measurements that the computer (1) exports multi-channel synchronous frequency sweep lock-in amplifier (2) are acquired, handle
And display.
2. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 1, its feature exist
In the multi-channel synchronous frequency sweep lock-in amplifier (2) has the function of step frequency scanning survey, and frequency sweeping ranges are
1kHz-100MHz；The multi-channel synchronous frequency sweep lock-in amplifier (2) has the function of that two frequencies measure at the same time, i.e., single
The amplitude and phase of two frequency signals in input channel can be measured simultaneously out, and the cross jamming of two frequency measurements is small
In -60dB.
3. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 1 or 2, its feature
It is, the short wavelength semiconductor laser (4) and the central wavelength difference of the long wavelength semiconductor laser (5) are
100nm, makes the Stokes Raman of the short wavelength semiconductor laser (4) scatter light and the long wavelength semiconductor laser
(5) peak wavelength of anti-Stokes Raman scattering light is equal.
4. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 3, its feature exist
In, the short wavelength semiconductor laser (4) and the central wavelength difference of the long wavelength semiconductor laser (5) are 100nm,
The Stokes Raman of the short wavelength semiconductor laser (4) is set to scatter light and the long wavelength semiconductor laser (5)
The peak wavelength of anti-Stokes Raman scattering light is equal.
5. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 1,2 or 4, it is special
Sign is that the optical fiber wave multiplexer (6) is a kind of optical fibre wavelength division multiplexer.
6. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 3, its feature exist
In the optical fiber wave multiplexer (6) is a kind of optical fibre wavelength division multiplexer.
7. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 1,2,4 or 6, its
It is characterized in that, the splitting ratio of the fiber coupler (7) is 10:90 to 50:50.
8. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 5, its feature exist
In the splitting ratio of the fiber coupler (7) is 10:90 to 50:50.
9. a kind of double light source self-correction formula fiber optic Distributed Temperature Fast measurement systems according to claim 7, its feature exist
In the optical detection module (9) amplifies electricity by 2 PIN photodiodes, 1 avalanche photodide and low noise mutual conductance
Road forms.
10. a kind of double light source self-correction formula fiber optic Distributed Temperature method for fast measuring, it is characterised in that using incoherent light frequency domain
Reflection technology, while with the carrying out different frequency intensity modulated to two light sources, after cross-correlation test algorithm is to two kinds of frequencies
To Raman diffused light demodulate at the same time, realize the high accuracy to districution temperature and quick measurement；Comprise the following steps that：
Computer (1) sends instruction to multi-channel synchronous frequency sweep lock-in amplifier (2) first；Light source driving circuit (3) receives more
The step frequency swept modulated signal for the two-way different frequency that Channel Synchronous frequency sweep lock-in amplifier (2) produces drives at the same time respectively
Short wavelength semiconductor laser (4) and long wavelength semiconductor laser (5)；Then short wavelength semiconductor laser (4) and long wave
The output light of long semiconductor laser (5) merges after optical fiber wave multiplexer (6) is input to fiber coupler (7), the few portion separated
Light splitting incides optical detection module (9) as with reference to light, and most of light incides thermometric after being reflected by Raman wavelength division multiplexer (8)
In optical fiber (10)；The backward Raman scattering light produced in temperature-measuring optical fiber (10) incides after Raman wavelength division multiplexer (8) filters out
Optical detection module (9)；The backward Rayleigh scattering light produced at the same time in temperature-measuring optical fiber (10) is reflected by Raman wavelength division multiplexer (8)
Afterwards, the part light separated after fiber coupler (7) incides optical detection module (9)；Optical detection module (9) is by what is received
Reference light, Raman diffused light and Rayleigh scattering light are converted into electric signal and are input to multi-channel synchronous frequency sweep lock-in amplifier (2)；It is more
The small-signal of two kind modulating frequencies of the Channel Synchronous frequency sweep lock-in amplifier (2) to being included at the same time in photosignal carries out at the same time
After demodulation, the measurement result after all frequency scannings is transferred to computer (1)；Last computer (1) is become by anti-Fourier
After scaling method recovers two Rayleigh scattering curves and two backward Raman scattering curves, the demodulation of self-correcting districution temperature is carried out simultaneously
Display.
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| CN110553674A (en) * | 2018-05-30 | 2019-12-10 | 华为技术有限公司 | Measuring method and measuring device |
| CN111006786A (en) * | 2019-11-22 | 2020-04-14 | 太原理工大学 | Double-path high-precision temperature demodulation method based on distributed optical fiber Raman sensing system |
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| CN113507317A (en) * | 2021-07-09 | 2021-10-15 | 电子科技大学中山学院 | Optical fiber fault monitoring device and method based on incoherent optical frequency domain reflection |
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