CN108562237A - A kind of device and method carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers - Google Patents
A kind of device and method carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers Download PDFInfo
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- CN108562237A CN108562237A CN201810007584.3A CN201810007584A CN108562237A CN 108562237 A CN108562237 A CN 108562237A CN 201810007584 A CN201810007584 A CN 201810007584A CN 108562237 A CN108562237 A CN 108562237A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
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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
Abstract
The invention discloses a kind of device and method carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers, increase HCN gas chambers in traditional probe beam deflation sensing device and synchronize acquisition, ensures each swept frequency range consistency by HCN absorption line peak positions establish scanning starting and terminate wavelength.Device and method of the present invention reduce the performance requirement to existing tunable laser, while reducing the error of spectroscopic studying amount, effectively increase distributed measurement precision.The present invention provides a kind of optical fiber strain measure methods based on OFDR technologies carrying out Wavelength calibration using HCN gas chambers, the strain to each position is realized present invention utilizes OFDR methods or temperature is measured in real time, using HCN gas chambers to the characteristic of the Accurate Calibration of tunable laser swept-frequency signal, the problem for overcoming the accuracy deficiency of tunable laser output wavelength, realizes the strain real-time and accurate measurement of optical fiber.
Description
Technical field
The invention belongs to Distributed Optical Fiber Sensing Techniques fields, and in particular to a kind of to be sensed in probe beam deflation using HCN gas chambers
The device and method that spectroscopic calibration is carried out in system.
Background technology
It is more that high-precision distributed sensing is widely used in structural health detection, surface surface type measurement, optical fiber 3D shape sensing etc.
In a field, and it is particularly important in the real-time and accurate measurement distributed sensing of fibre strain or temperature.Mark in 1998
What Froggatt was proposed moves achievable high-precision high score using single mode optical fiber Rayleigh Scattering Spectra in probe beam deflation (OFDR)
Distributed sensing (the High-spatial-resolution distributed strain measurement in of resolution
optical fiber with Rayleigh scatter).The technology require measurement process twice (be once reference state,
It is once that physical quantity changes state) laser sweep range, start wavelength strict conformance, that is, the spectrum of frequency sweep twice
Strictly it is aligned.The inconsistent of light source frequency sweep spectrum can cause the Rayleigh Scattering Spectra resolved to change, and reduce sensing essence
Degree, causes the technology measurement error.However, the output wavelength of tunable laser is due to dry by itself and environment at present
It disturbs, there may be gap, the frequency sweep repeatability of tuning source is relatively difficult to achieve for the wavelength of output and the wavelength of theory setting.With France
For a tunable laser of Yenista companies, tuning repeatability is in ± 5pm, and the higher laser of repeatability, such as
Agilent 81607A, although repeatability is in 1pm, its price is very expensive.Find a kind of effective and economic answer
In probe beam deflation sensing technology carry out spectrum alignment scheme to improve physical quantity precision have great significance and
Value.
Invention content
According to problem of the existing technology, use HCN gas chambers in probe beam deflation sensor-based system the invention discloses a kind of
The device of spectroscopic calibration is carried out, including：Scanning light source for providing light source for probe beam deflation system, the scanning light source
Light source outlet end is connected with photo-coupler one, and the photo-coupler one is connected by the ports c with main interferometer, the trunk
Interferometer is connected with the input terminal of data collecting card；The photo-coupler one is connected by the ports b with coupler, the coupling
Device is connected by the ports b with HCN Wavelength calibration modules, and the HCN Wavelength calibrations module is connected with data collecting card, described
HCN gas chambers and photodetector, output end and the photodetector phase of the HCN gas chambers are provided in HCN Wavelength calibration modules
Connection；The third photo-coupler is connected by the ports c with auxiliary interferometer, the output end and data of the auxiliary interferometer
Capture card is connected, and the data collecting card is connected with computer.
The main interferometer includes photo-coupler, circulator, the second photo-coupler of sensor fibre and balanced detector, the optocoupler
The input terminal of clutch is connected with the ports c of photo-coupler one, output end and circulator and the second optocoupler of the photo-coupler
Clutch is connected, and second photo-coupler is connected with balanced detector, and output end and the data of the balanced detector are adopted
The input terminal of truck is connected；The circulator is connected with sensor fibre, the output end of the circulator and the second optical coupling
Device is connected.
The auxiliary interferometer includes the 4th photo-coupler, the first faraday rotation mirror, the second faraday rotation mirror, the first photoelectricity
Detector and clock Shaping Module, the output end and the first faraday rotation mirror of the 4th photo-coupler and the second faraday rotation
Tilting mirror is connected, and the input terminal of the 4th photo-coupler is connected with the first photodetector, first photodetector
It is connected with clock Shaping Module, the output end of the clock Shaping Module is connected with data collecting card.
A method of spectroscopic calibration is carried out in probe beam deflation sensor-based system using HCN gas chambers, is included the following steps：
S1：Acquisition system is opened, the zero crossing of auxiliary interferometer signal is set as outer triggering signal Sa；
S2：If the frequency sweep start wavelength of tunable laser is λst, termination wavelength is λen, frequency sweep unlatching, capture card is in triggering letter
Number SaTriggering under synchronous recording main interferometer transducing signal A1MAnd HCN gas chamber data A1H；
S3：To HCN gas cell signals A1HFitting obtain each attenuation peak of gas absorption spectrum line, by after fitting attenuation peak with
Gas absorption spectrum line is compared, and the number corresponding to respective attenuation peak is found, and determines corresponding wavelength, searches decaying peak center institute
Corresponding sampling point position chooses one of absorption peak wavelength as λ0, record its corresponding sampling point position P1, simultaneously will
Main interferometer sensing data A1MIn P1The initial position that a data are measured as this；
S4：Choose the corresponding wavelength X of two attenuation peaksaAnd λb, calculate wherein Additional interference instrument signal zero crossing number be calculated as
N0, calibrate and obtain Additional interference instrument zero crossing wavelength interval Δ λmin, Δ λmin=(λb-λa)/N0；
S5：P is chosen in main interferometer1The point sampled data that N points are recorded as this below, obtained length are the one-dimensional of N
Ordered series of numbers is denoted as reference signal S1, obtain record swept frequency range Δ λ=N × Δ λmin；
S6：After strain or temperature change occurs, S2, S3 and S5 are repeated, another dimension row that length is N is obtained and is denoted as reference signal
Measuring signal S2；
S7：Respectively to S1And S2Fast Fourier Transform (FFT) is carried out, optical frequency domain information is transformed into each position in sensor fibre
Apart from domain information, the signal of each position in sensor fibre is scanned using Moving Window, light is transformed into using inverse Fourier transform
Frequency domain, the Rayleigh scattering light spectrum signal of the reference signal and measuring signal of corresponding each position；
S8：Computing cross-correlation is carried out to the Rayleigh scattering light spectrum signal of reference signal and measuring signal, it is opposite to obtain measuring signal
Cross-correlation peak value in each position of reference signal deviates center and measures, to obtain tested strain value.
By adopting the above-described technical solution, one kind provided by the invention carries out spectrum alignment in probe beam deflation sensing technology
Device and method, in traditional probe beam deflation sensing device increase HCN gas chambers synchronize acquisition, absorbed by HCN
Spectral line peak position establishes scanning starting and terminates wavelength and then ensure each swept frequency range consistency.It is of the present invention
Device and method reduce the performance requirement to existing tunable laser, while reducing the error of spectroscopic studying amount, effectively
Improve distributed measurement precision.The present invention provides it is a kind of using HCN gas chambers carry out Wavelength calibration based on OFDR technologies
Optical fiber strain measure method realizes the strain to each position present invention utilizes OFDR methods or temperature is surveyed in real time
Amount, using HCN gas chambers to the characteristic of the Accurate Calibration of tunable laser swept-frequency signal, overcomes tunable laser output wavelength
The problem of accuracy deficiency realizes the strain real-time and accurate measurement of optical fiber.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing skill
Attached drawing is briefly described needed in art description, it should be apparent that, the accompanying drawings in the following description is only the application
Described in some embodiments without creative efforts, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow chart for the method carrying out spectrum alignment using HCN gas chambers in probe beam deflation sensing technology；
Fig. 2 is the schematic device for carrying out spectrum alignment using HCN gas chambers in probe beam deflation sensing technology；
Fig. 3 is the HCN gas absorption spectrum line standard spectrums after normalization；
Reference numeral in figure：1, computer, 2, scanning light source, 3, photo-coupler one, 4, photo-coupler, 5, circulator, 6, pass
Photosensitive fibre, the 7, second photo-coupler, 8, balanced detector, 9 third photo-couplers, 10 the 4th photo-couplers, the 11, first faraday
Revolving mirror, the 12, second faraday rotation mirror, 13 first photodetectors, 14, clock Shaping Module, 15, HCN gas chambers, 16, light
Electric explorer, 17, data collecting card, 18, HCN Wavelength calibration modules, 19 auxiliary interferometers, 20, main interferometer.
Specific implementation mode
To keep technical scheme of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to the present invention
Technical solution in embodiment is clearly completely described：
A kind of device carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers as shown in Figure 1, including：
Scanning light source 2 for providing light source for probe beam deflation system, the wherein optical frequency of scanning light source 2 can carry out linear scan,
The light source outlet end of scanning light source 2 is connected with photo-coupler 1, and photo-coupler 1 is connected by the ports c with main interferometer 20
It connects, main interferometer 20 is connected with the input terminal of data collecting card 17；Photo-coupler 1 is connected by the ports b with coupler 9
It connects, the coupler 9 is connected by the ports b with HCN Wavelength calibrations module 18, and HCN Wavelength calibrations module 18 is acquired with data
Card 17 is connected, and HCN gas chambers 15 and photodetector 16, the output end of HCN gas chambers 15 are provided in HCN Wavelength calibrations module 18
It is connected with photodetector 16；Third photo-coupler 9 is connected by the ports c with auxiliary interferometer 19, auxiliary interferometer 19
Output end be connected with data collecting card 17, data collecting card 17 is connected with computer 1.
Further, the main interferometer 20 includes photo-coupler 4, circulator 5,6 second photo-coupler 7 of sensor fibre and balance
Detector 8, the input terminal of photo-coupler 4 are connected with the ports c of photo-coupler 1, the output end and ring of the photo-coupler 4
Shape device 5 is connected with the second photo-coupler 7, and the second photo-coupler 7 is connected with balanced detector 8, the balanced detector 8
Output end is connected with the input terminal of data collecting card 17；The circulator 5 is connected with sensor fibre 6, the circulator 5
Output end is connected with the second photo-coupler 7.
Further, the auxiliary interferometer 19 includes the 4th photo-coupler 10, the first faraday rotation mirror 11, the second faraday
Revolving mirror 12, the first photodetector 13 and clock Shaping Module 14, the output end of the 4th photo-coupler 10 and the first faraday
Revolving mirror 11 is connected with the second faraday rotation mirror 12, input terminal and 13 phase of the first photodetector of the 4th photo-coupler 10
Connection, the first photodetector 13 are connected with clock Shaping Module 14, the output end and data of the clock Shaping Module 14
Capture card 17 is connected.
A method of spectroscopic calibration is carried out in probe beam deflation sensor-based system using HCN gas chambers：Include the following steps：
S1：Acquisition system is opened, the zero crossing of auxiliary interferometer signal is set as outer triggering signal Sa；
S2：If the frequency sweep start wavelength of tunable laser is λst, termination wavelength is λen, frequency sweep unlatching, capture card is in triggering letter
Number SaTriggering under synchronous recording main interferometer transducing signal A1MAnd HCN gas chamber data A1H；
S3：To HCN gas cell signals A1HFitting obtain each attenuation peak of gas absorption spectrum line, by after fitting attenuation peak with
Gas absorption spectrum line is compared, and the number corresponding to respective attenuation peak is found, and determines corresponding wavelength, searches decaying peak center institute
Corresponding sampling point position chooses one of absorption peak wavelength as λ0, record its corresponding sampling point position P1, simultaneously will
Main interferometer sensing data A1MIn P1The initial position that a data are measured as this；
S4：Choose the corresponding wavelength X of two attenuation peaksaAnd λb, calculate wherein Additional interference instrument signal zero crossing number be calculated as
N0, calibrate and obtain Additional interference instrument zero crossing wavelength interval Δ λmin, Δ λmin=(λb-λa)/N0；
S5：P is chosen in main interferometer1The point sampled data that N points are recorded as this below, obtained length are the one-dimensional of N
Ordered series of numbers is denoted as reference signal S1, obtain record swept frequency range Δ λ=N × Δ λmin；
S6：After strain or temperature change occurs, S2, S3 and S5 are repeated, another dimension row that length is N is obtained and is denoted as reference signal
Measuring signal S2；
S7：Respectively to S1And S2Fast Fourier Transform (FFT) is carried out, optical frequency domain information is transformed into each position in sensor fibre
Apart from domain information, the signal of each position in sensor fibre is scanned using Moving Window, light is transformed into using inverse Fourier transform
Frequency domain, the Rayleigh scattering light spectrum signal of the reference signal and measuring signal of corresponding each position；
S8：Computing cross-correlation is carried out to the Rayleigh scattering light spectrum signal of reference signal and measuring signal, it is opposite to obtain measuring signal
Cross-correlation peak value in each position of reference signal deviates center and measures, to obtain tested strain value.
Embodiment：
1st step, the scanning range range start wavelength for determining scanning light source, since HCN gas chambers 15 are in a wavelength range
In (1525nm-1565nm), there is absorbability to the light of certain specific wavelengths, and there is very high precision, thus select
The corresponding wavelength X of a certain absorption line peak value of HCN gas chambers1, λ here1Take 1540.43120nm.It takes and is set in tunable laser
Set frequency sweep start wavelength λ2Termination wavelength is λ3, to make the accurate wavelength start wavelength λ of calibration2λ should be slightly less than1, while by sweeping
λ can be selected by retouching the precision conditions of light source1For 1540.00nm；
2nd step opens acquisition system, and the zero crossing of 19 signal of auxiliary interferometer is arranged as outer triggering signal, auxiliary interference
The generation interference signal of instrument passes through opto-electronic conversion and clock shaping, interference beat signal is shaped as square wave, since we are right
The DATA REASONING processing of sensor fibre 6 needs to use Fast Fourier Transform (FFT), and the frequency interval sampled in this way is consistent, auxiliary here
The zero crossing of interferometer 19 is helped to become the condition at equal intervals of frequency of meeting, so the square-wave signal come out from auxiliary interferometer 19 can be with
External timing signal as harvester；
3rd step, laser sweep are opened, synchronous recording main interferometer sensing data A1MAnd 15 data A of HCN gas chambers1H, trunk
20 sensing data of interferometer is to form beat frequency interference signal through Rayleigh scattering by sensing section in sensor fibre 6, and HCN gas chambers 15 are one
In wavelength range (1525nm-1565nm), there is absorbability to the light of certain specific wavelengths, and there is very high essence
Degree, the data of HCN gas chambers 15 meet accurate Wavelength calibration condition；
4th step, to HCN data A1HFitting obtains each attenuation peak of gas absorption spectrum line, by the attenuation peak and figure after fitting
In gas absorption spectrum line compared, find the number corresponding to respective attenuation peak, determine corresponding wavelength, search in attenuation peak
Sampling point position corresponding to the heart records λ1The corresponding sampling point position P of wavelength1, in interferometer sensing data A1MIn P1It is a
Initial position of the data as the secondary measurement；In order to keep the zero crossing wavelength interval of sampling accurate as much as possible, needing to exhaust can
Points more than energy, that is, the wavelength between two attenuation peaks chosen is as long as possible, chooses the corresponding wavelength X of two attenuation peaks here1
For 1540.43120nm and λ2For 1544.51503nm, the zero crossing number of wherein Additional interference instrument signal is calculated, N is calculated as0, school
Additional interference instrument zero crossing wavelength interval Δ λ will definitely be arrivedmin；
5th step, the strain value and temperature change value that measure sensor fibre 6 are needed using sensor fibre conduct when not changing
Reference quantity, then P1The sampled data that N points are recorded as this, that is, reference signal S are chosen below1, obtain record frequency sweep model
Enclose Δ λ=N × Δ λmin；
6th step after strain or temperature change occurs, repeats the 3rd step to 5 steps, obtains measuring signal S2；
7th step, respectively to S1And S2Fast Fourier Transform (FFT) is carried out, optical frequency domain information is transformed into each position in sensor fibre
Apart from domain information, the signal of each position in sensor fibre is scanned using Moving Window, is transformed into using inverse Fourier transform
Optical frequency domain, the Rayleigh scattering light spectrum signal of the reference signal and measuring signal of corresponding each position；
8th step carries out computing cross-correlation to the Rayleigh scattering light spectrum signal of reference signal and measuring signal, obtains measuring signal phase
Center amount is deviateed for the cross-correlation peak value of each position of reference signal, obtains measurand, i.e., corresponding dependent variable and temperature
Spend variable quantity.
It is measured in real time in conclusion realizing the strain to each position present invention utilizes OFDR methods, utilizes HCN gas
To the characteristic of the Accurate Calibration of tunable laser swept-frequency signal, the accuracy for overcoming tunable laser output wavelength is insufficient for room 15
The problem of, realize the strain of optical fiber and the real-time and accurate measurement of temperature change.
Above-mentioned scheme is described in detail with reference to specific strain sensing device, it is described below：
Scanning light source 2 exports the light of continuous wavelength with certain sweep speed, and the light that scanning light source 2 is sent out is from 90/10 optical coupling
The passways a of device 3 input, and are divided into two-beam signal by 90/10 photo-coupler 3, wherein weak a branch of optical signal is defeated from the passways b
Go out, the passways a by 50/50 photo-coupler 11 enter photo-coupler 11, and it is equal to be divided into light intensity by 50/50 photo-coupler 11
Two-beam signal, wherein a branch of optical signal is exported from the passways b of 50/50 photo-coupler 11, into HCN gas chambers 17, fixed frequency
By gas molecules sorb in gas chamber, the optical signal after being absorbed is converted to the optical signal of rate range by photodetector 18
Electric signal, to the wave-length coverage of Calibrating source, the sample rate by adjusting Data Acquisition Card 19 is acquired analog signal.
In addition light beam is exported from the passways c of 50/50 photo-coupler 11, and light enters from the passways a of 50/50 photo-coupler 12, from
The ports c and d of photo-coupler are emitted, anti-by the first faraday rotation mirror 13 of two-arm and the second faraday rotation mirror 14 respectively
It penetrates, returns to the port c, d of coupler 12, two-beam interferes in photo-coupler, defeated from 12 ports b of photo-coupler
Go out, emergent light enters detector 15, and the optical signal detected is converted to interference beat signal and is transmitted to clock shaping by detector
Module, clock Shaping Module will interfere beat signal to be shaped as square wave, the signal transmission after shaping to Data Acquisition Card 19, as
The external timing signal of harvester.The stronger a branch of optical signal being emitted from 90/10 photo-coupler 3 is defeated from 3 passways c
Go out, the passways a by 50/50 photo-coupler 4 enter photo-coupler 4, are divided into equal two of light intensity by 50/50 photo-coupler 4
Beam optical signal, wherein a branch of optical signal is exported from the passways b of 50/50 photo-coupler 4, a into 50/50 photo-coupler 7 is logical
Road junction, another beam optical signal is exported from the passways c of 50/50 photo-coupler 4, into the passways a of circulator 5, from circulator 5
The ports c enter sensor fibre, and the back-scattering light of sensor fibre enters from the ports c of circulator 5, from the ends b of circulator 4
Mouth output, the optical signal entered into the passways b of 50/50 photo-coupler 7 and the passways a carry out conjunction beam, form beat frequency interference
And exported from the ports c of 50/50 photo-coupler 7 and the ports d to the first polarization beam apparatus 8 and the second polarization beam apparatus 9, then into
Enter balanced detector 10, the analog electrical signal of output is transmitted to Data Acquisition Card 19, Data Acquisition Card 19 by balanced detector 10
Collected analog electrical signal is transmitted to computer 1 under the external timing signal effect that clock Shaping Module 21 is formed, is counted
Calculation machine 1 carries out data processing to the interference signal that Data Acquisition Card 19 acquires, and realizes the base that Wavelength calibration is carried out using HCN gas chambers
In the optical fiber strain measure of OFDR technologies.
The data handling procedure of real-time wavelength scaling method for length scanning system includes to being acquired after gas chamber
Data are handled, and according to the function of gas chamber, gas molecule only absorbs the light signal energy of specific wavelength, and
The degree of different wave length position optical power attenuation is different, and Fig. 3 is provided after gas chamber, the wavelength location of optical power down and returns
One change after decline degree, each attenuation peak after absorbing gas in figure is numbered, and is divided into two portions R and P
Point, it is each decaying peak center corresponding to wavelength can by 1 acquisition of tabling look-up,
Table 1
According to the function of gas chamber, it is fitted processing firstly the need of the data to acquisition, fits HCN gas absorption spectrum lines
Each attenuation peak is fitted each attenuation peak of gas absorption spectrum line using Voigt curves, by the attenuation peak after fitting
It is compared with the gas absorption spectrum line in Fig. 3, finds the number corresponding to respective attenuation peak, 1 may know that this by tabling look-up
The wavelength decayed corresponding to peak center, by searching for the sampled point corresponding to decaying peak center, according to the sample rate sampling
The point corresponding sampling time, it is known that the wavelength corresponding to decaying peak center and sampling time, can be realized to scanning light source into
Row real-time calibration.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, and it is any
Those familiar with the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invents
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of device carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers, it is characterised in that：Packet
It includes：Scanning light source (2) for providing light source for probe beam deflation system, the light source outlet end of the scanning light source (2) and light
Coupler one (3) is connected, and the photo-coupler one (3) is connected by the ports c with main interferometer (20), the main interferometer
(20) it is connected with the input terminal of data collecting card (17)；The photo-coupler one (3) is connected by the ports b with coupler (9)
It connects, the coupler (9) is connected by the ports b with HCN Wavelength calibrations module (18), the HCN Wavelength calibrations module (18)
It is connected with data collecting card (17), HCN gas chambers (15) and photodetector is provided in the HCN Wavelength calibrations module (18)
(16), the output end of the HCN gas chambers (15) is connected with photodetector (16)；The third photo-coupler (9) passes through the ends c
Mouth is connected with auxiliary interferometer (19), and the output end of the auxiliary interferometer (19) is connected with data collecting card (17), institute
Data collecting card (17) is stated with computer (1) to be connected.
A kind of spectroscopic calibration is carried out in probe beam deflation sensor-based system using HCN gas chambers 2. according to claim 1
Device, it is further characterized in that：The main interferometer (20) includes photo-coupler (4), circulator (5), (6) second light of sensor fibre
The input terminal of coupler (7) and balanced detector (8), the photo-coupler (4) is connected with the ports c of photo-coupler one (3),
The output end of the photo-coupler (4) is connected with circulator (5) and the second photo-coupler (7), second photo-coupler (7)
It is connected with balanced detector (8), the output end of the balanced detector (8) is connected with the input terminal of data collecting card (17)
It connects；The circulator (5) is connected with sensor fibre (6), output end and the second photo-coupler (7) phase of the circulator (5)
Connection.
A kind of spectroscopic calibration is carried out in probe beam deflation sensor-based system using HCN gas chambers 3. according to claim 1
Device, it is further characterized in that：The auxiliary interferometer (19) includes the 4th photo-coupler (10), the first faraday rotation mirror
(11), the second faraday rotation mirror (12), the first photodetector (13) and clock Shaping Module (14), the 4th optical coupling
The output end of device (10) is connected with the first faraday rotation mirror (11) and the second faraday rotation mirror (12), the 4th optocoupler
The input terminal of clutch (10) is connected with the first photodetector (13), first photodetector (13) and clock sizing die
Block (14) is connected, and the output end of the clock Shaping Module (14) is connected with data collecting card (17).
4. a kind of method carrying out spectroscopic calibration in probe beam deflation sensor-based system using HCN gas chambers, it is characterised in that：Including
Following steps：
S1：Acquisition system is opened, the zero crossing of auxiliary interferometer signal is set as outer triggering signal Sa；
S2：If the frequency sweep start wavelength of tunable laser is λst, termination wavelength is λen, frequency sweep unlatching, capture card is in triggering letter
Number SaTriggering under synchronous recording main interferometer transducing signal A1MAnd HCN gas chamber data A1H；
S3：To HCN gas cell signals A1HFitting obtains each attenuation peak of gas absorption spectrum line, by the attenuation peak and gas after fitting
Body absorption line is compared, and the number corresponding to respective attenuation peak is found, and determines corresponding wavelength, and it is right to search decaying peak center institute
The sampling point position answered chooses one of absorption peak wavelength as λ0, record its corresponding sampling point position P1, while will lead
Interferometer sensing data A1MIn P1The initial position that a data are measured as this；
S4：Choose the corresponding wavelength X of two attenuation peaksaAnd λb, calculate wherein Additional interference instrument signal zero crossing number be calculated as
N0, calibrate and obtain Additional interference instrument zero crossing wavelength interval Δ λmin, Δ λmin=(λb-λa)/N0；
S5：P is chosen in main interferometer1The point sampled data that N points are recorded as this below, obtained length are a dimension of N
Row are denoted as reference signal S1, obtain record swept frequency range Δ λ=N × Δ λmin；
S6：After strain or temperature change occurs, S2, S3 and S5 are repeated, another one-dimensional ordered series of numbers that length is N is obtained and is denoted as measuring letter
Number S2；
S7：Respectively to S1And S2Carry out Fast Fourier Transform (FFT), by optical frequency domain information be transformed into each position in sensor fibre away from
Delocalization information is scanned the signal of each position in sensor fibre using Moving Window, optical frequency is transformed into using inverse Fourier transform
Domain, the Rayleigh scattering light spectrum signal of the reference signal and measuring signal of corresponding each position；
S8：Computing cross-correlation is carried out to the Rayleigh scattering light spectrum signal of reference signal and measuring signal, it is opposite to obtain measuring signal
Cross-correlation peak value in each position of reference signal deviates center and measures, to obtain tested strain value.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682403A (en) * | 2019-01-29 | 2019-04-26 | 南京大学 | The method of tunable laser nonlinear frequency sweeping is corrected in a kind of optical frequency domain reflectometer |
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| CN113670350A (en) * | 2020-05-15 | 2021-11-19 | 大连理工大学 | High-precision optical frequency domain reflection method, device and system |
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| CN109682403A (en) * | 2019-01-29 | 2019-04-26 | 南京大学 | The method of tunable laser nonlinear frequency sweeping is corrected in a kind of optical frequency domain reflectometer |
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| CN110375782A (en) * | 2019-07-29 | 2019-10-25 | 武汉隽龙科技股份有限公司 | Improve the device and method of OFDR single sweep operation demodulation speed |
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| CN113670350B (en) * | 2020-05-15 | 2022-06-21 | 大连理工大学 | High-precision optical frequency domain reflection method, device and system |
| CN112082584A (en) * | 2020-06-05 | 2020-12-15 | 哈尔滨工业大学 | Optical fiber distributed physical quantity measuring method, device and system based on laser tuning control |
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| CN113218320A (en) * | 2021-05-06 | 2021-08-06 | 山东大学 | OFDR (offset-field-of-view) large strain measurement method based on distance domain compensation |
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