CN106872071A - A kind of temp measuring method based on optical frequency domain reflection technology - Google Patents
A kind of temp measuring method based on optical frequency domain reflection technology Download PDFInfo
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- CN106872071A CN106872071A CN201611270831.6A CN201611270831A CN106872071A CN 106872071 A CN106872071 A CN 106872071A CN 201611270831 A CN201611270831 A CN 201611270831A CN 106872071 A CN106872071 A CN 106872071A
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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 temp measuring method based on optical frequency domain reflection technology, step includes：Gathered signal, respectively reference signal and measurement signal twice respectively；The wavelength domain beat signal of reference signal and measurement signal is transformed into distance domain by FFT respectively；Using Moving Window scanning in the reference signal and measurement signal of distance domain, distance domain signal is divided into each local distance domain signal；Each local distance domain signal of the local distance domain signal of reference signal and measurement signal is transformed into wavelength domain using FFT inverse transformations；The local Rayleigh scattering light spectrum signal of reference signal and measurement signal is carried out into computing cross-correlation, the cross-correlation peak value amount of movement of each position is obtained, in occurrence temperature or the position of the external disturbance of strain, cross-correlation peak value can be off-center, and deviation value is to inductive sensing amount.The present invention has obvious advantage in spatial resolution, sensitivity, sensing accuracy.
Description
Technical field
The present invention relates to optical cable detection technique field, particularly a kind of temp measuring method based on optical frequency domain reflection technology.
Background technology
Distribution type fiber-optic is measured has many reference amounts, intellectuality, Large Copacity, multichannel, high sensitivity etc. no with sensing technology
Alternative advantage.Traditional OTDR methods are although in measuring distance, spatial resolution, sensitivity, sensing measurement performance, response speed
There is important breakthrough on degree, but these indexs also need further to improve, it is necessary to explore the distribution of a new generation in some applications
Optical fiber measurement and sensing technology.OFDR technologies are the emerging directions of distribution type fiber-optic measurement and sensing technology.From development shape at present
Condition sees that OFDR has obvious advantage compared with conventional Time-domain OTDR technique in spatial resolution, sensitivity, sensing accuracy, the present invention
It is namely based on a kind of new distribution type optical fiber temperature-measurement method of OFDR technologies proposition.
The content of the invention
For problems of the prior art, the invention provides one kind in spatial resolution, sensitivity, sensing accuracy
On have the temp measuring method based on optical frequency domain reflection technology of obvious advantage.
The purpose of the present invention is achieved through the following technical solutions.
A kind of temp measuring method based on optical frequency domain reflection technology, step includes：
1) gathered signal twice respectively, wherein being once reference signal, i.e., do not applied the outside of temperature or strain
Disturbance, another time is measurement signal, that is, apply the external disturbance of temperature or strain；
2) the wavelength domain beat signal of reference signal and measurement signal is transformed into distance domain by FFT respectively；
3) distance domain signal is divided into each in the reference signal and measurement signal of distance domain using Moving Window scanning
Ground distance domain signal；
4) each local distance domain signal of the local distance domain signal of reference signal and measurement signal is utilized into FFT contravariant
Change and be transformed into wavelength domain, that is, correspond to the reference signal of each position in optical fiber and the local Rayleigh Scattering Spectra letter of measurement signal
Number；
5) the local Rayleigh scattering light spectrum signal of reference signal and measurement signal is carried out into computing cross-correlation, now needs to use
Computing cross-correlation processes the reference signal of each position in correspondence optical fiber and the local Rayleigh Scattering Spectra letter of measurement signal successively
Number, the cross-correlation peak value amount of movement of each position is obtained, in occurrence temperature or the position of the external disturbance of strain, cross-correlation peak value
Can be off-center, deviation value is to inductive sensing amount.
Compared to prior art, the advantage of the invention is that：Compared with traditional OTDR distributed temperature measuring methods, in space
Resolution ratio, there is obvious advantage in sensitivity, sensing accuracy.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Specific embodiment
With reference to Figure of description and specific embodiment, the present invention is described in detail.
A kind of temp measuring method based on optical frequency domain reflection technology, step includes：
1) gathered signal twice respectively, wherein being once reference signal, i.e., do not applied the outside of temperature or strain
Disturbance, another time is measurement signal, that is, apply the external disturbance of temperature or strain；
2) the wavelength domain beat signal of reference signal and measurement signal is transformed into distance domain by FFT respectively；
3) distance domain signal is divided into each in the reference signal and measurement signal of distance domain using Moving Window scanning
Ground distance domain signal；
4) each local distance domain signal of the local distance domain signal of reference signal and measurement signal is utilized into FFT contravariant
Change and be transformed into wavelength domain, that is, correspond to the reference signal of each position in optical fiber and the local Rayleigh Scattering Spectra letter of measurement signal
Number；
5) the local Rayleigh scattering light spectrum signal of reference signal and measurement signal is carried out into computing cross-correlation, now needs to use
Computing cross-correlation processes the reference signal of each position in correspondence optical fiber and the local Rayleigh Scattering Spectra letter of measurement signal successively
Number, the cross-correlation peak value amount of movement of each position is obtained, in occurrence temperature or the position of the external disturbance of strain, cross-correlation peak value
Can be off-center, deviation value is to inductive sensing amount.
Claims (1)
1. a kind of temp measuring method based on optical frequency domain reflection technology, it is characterised in that step includes：
1) gathered signal twice respectively, wherein being once reference signal, i.e., do not applied the external disturbance of temperature or strain,
Another time is measurement signal, that is, apply the external disturbance of temperature or strain；
2) the wavelength domain beat signal of reference signal and measurement signal is transformed into distance domain by FFT respectively；
3) distance domain signal is divided into each this distance in the reference signal and measurement signal of distance domain using Moving Window scanning
Delocalization signal；
4) each local distance domain signal of the local distance domain signal of reference signal and measurement signal is turned using FFT inverse transformations
Wavelength domain is changed to, that is, corresponds to the reference signal and the local Rayleigh scattering light spectrum signal of measurement signal of each position in optical fiber；
5) the local Rayleigh scattering light spectrum signal of reference signal and measurement signal is carried out into computing cross-correlation, is now needed with mutually
Reference signal and the local Rayleigh scattering light spectrum signal of measurement signal that computing processes each position in correspondence optical fiber successively are closed, is obtained
To the cross-correlation peak value amount of movement of each position, in occurrence temperature or the position of the external disturbance of strain, cross-correlation peak value can be inclined
From center, deviation value is to inductive sensing amount.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270952A (en) * | 2017-07-27 | 2017-10-20 | 天津求实飞博科技有限公司 | Based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber |
| WO2020058830A1 (en) * | 2018-09-17 | 2020-03-26 | Universita' Degli Studi Di Firenze | Apparatus for optical investigation of photonic circuits |
| CN113155267A (en) * | 2021-03-09 | 2021-07-23 | 电子科技大学 | OFDR system vibration detection method and system based on secondary correlation, storage medium and terminal |
| CN113188461A (en) * | 2021-05-06 | 2021-07-30 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN113237431A (en) * | 2021-05-06 | 2021-08-10 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN114252022A (en) * | 2021-12-21 | 2022-03-29 | 南京航空航天大学 | Optical fiber multi-dimensional monitoring method and device based on GNSS signals |
| CN114777903A (en) * | 2022-04-27 | 2022-07-22 | 浙江大学 | Multi-point vibration detection method and device for optical frequency domain reflectometer based on signal cross correlation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270952A (en) * | 2017-07-27 | 2017-10-20 | 天津求实飞博科技有限公司 | Based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber |
| CN107270952B (en) * | 2017-07-27 | 2020-03-31 | 天津求实飞博科技有限公司 | Long-distance optical fiber distributed disturbance sensing signal processing method based on optical frequency domain reflection |
| WO2020058830A1 (en) * | 2018-09-17 | 2020-03-26 | Universita' Degli Studi Di Firenze | Apparatus for optical investigation of photonic circuits |
| CN113155267A (en) * | 2021-03-09 | 2021-07-23 | 电子科技大学 | OFDR system vibration detection method and system based on secondary correlation, storage medium and terminal |
| CN113188461A (en) * | 2021-05-06 | 2021-07-30 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN113237431A (en) * | 2021-05-06 | 2021-08-10 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN113237431B (en) * | 2021-05-06 | 2022-03-18 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN113188461B (en) * | 2021-05-06 | 2022-05-17 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN114252022A (en) * | 2021-12-21 | 2022-03-29 | 南京航空航天大学 | Optical fiber multi-dimensional monitoring method and device based on GNSS signals |
| CN114777903A (en) * | 2022-04-27 | 2022-07-22 | 浙江大学 | Multi-point vibration detection method and device for optical frequency domain reflectometer based on signal cross correlation |
| CN114777903B (en) * | 2022-04-27 | 2023-06-27 | 浙江大学 | Optical frequency domain reflectometer multipoint vibration detection method and device based on signal cross correlation |
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