NL2024922B1 - Temperature self-correction method by using fitting attenuation difference in distributed optical fiber raman temperature measuring system - Google Patents
Temperature self-correction method by using fitting attenuation difference in distributed optical fiber raman temperature measuring system Download PDFInfo
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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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- 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
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Abstract
The invention relates to a temperature self-correction method by using a fitting attenuation difference in a distributed optical fiber Raman temperature measuring system. In the invention, a Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained through a temperature demodulation principle; an attenuation coefficient difference-temperature fitting curve equation is obtained through a fitting curve; a temperature demodulation equation is obtained through the fitting curve equation and a ratio of light fluxes; after demodulation, primary correction of a temperature is realized; then; a Rayleigh noise is solved by combining with a relationship between Stokes light and anti-Stokes light signals and the Rayleigh noise; a corrected temperature demodulation formula is further obtained; re-correction is realized after demodulation; and a goal of temperature self-correction is achieved. Compared with a conventional method for eliminating the Rayleigh noise; the temperature self-correction method has the advantages that a temperature correction amount is improved; the precise measurement of the temperature is realized; an error problem caused by processing by regarding that Stokes light and anti-Stokes light attenuation coefficients are approximately equal is solved; and the requirement of precise detection of the temperature in a goaf and an adjacent old goaf of a coal mine is met.
Description
BACKGROUND Technical Field The invention relates to the technical field of an optical fiber sensing instrument, in particular to a temperature self-correction method by using a fitting attenuation difference in a distributed optical fiber Raman temperature measuring system. Related Art With the sustained and rapid development of economy, demands of our country on energy sources are increasing. In order to ensure mining safety of a coal mine and to prevent spontaneous combustion, temperatures in a goaf and an adjacent old goaf of the coal mine must be detected. At present, a distributed optical fiber Raman temperature measuring system is used for coal mine spontaneous combustion temperature monitoring. Stokes light and anti-Stokes light in Raman scattering light have different sensitivity on the temperature, so that position and temperature information of each point on an optical fiber is accurately measured by combining a ratio demodulation method with an optical time domain reflection technology, and the detection on an optical fiber temperature field is realized.
Inherent loss may be generated by different wavelengths of Stokes Raman scattering light and anti-Stokes Raman scattering light in the optical fiber, and additional loss may be generated by optical fiber bending, stress and environment temperature change, so that the Stokes Raman scattering light and the anti-Stokes Raman scattering light have different attenuation. During temperature demodulation, the two are generally regarded as being approximately equal to be processed, or empirical values are directly used, so that a demodulation result generates a great error. Therefore, a novel method is needed for solving a temperature error problem caused by attenuation coefficients.
SUMMARY The invention is directed to provide a temperature self-correction method by using a fitting attenuation difference in a distributed optical fiber Raman temperature measuring system, has the advantage of replacing inherent loss and additional loss by the fitting attenuation difference during temperature demodulation, and solves an error problem caused by processing by regarding that the two attenuation coefficients are approximately equal.
The temperature self-correction method by using the fitting attenuation difference in the distributed optical fiber Raman temperature measuring system is provided.
The temperature correction method comprises the following steps that: Step (1): a single-mode optical fiber with a total length being L is taken to be used as a sensing optical fiber 6; an optical fiber section I 8 and an optical fiber section II 9 with the same length on the sensing optical fiber 6 are put into a thermostat 7, a distance from a center point of the optical fiber section I 8 to a head end of the sensing optical fiber 6 is identical to a distance from a center point of the optical fiber section IT 9 to a tail end of the sensing optical fiber 6, and other parts of the sensing optical fiber 6 are put in a room temperature environment; a temperature control range of the thermostat 7 is set; a temperature is sequentially increased from a minimum value of the temperature control range to a maximum value of the temperature control range according to the same temperature interval; and corresponding output signal values after each time of temperature change are measured by the distributed optical fiber Raman temperature measuring system; Step (2): according to a ratio of a Stokes light flux to an anti-Stokes light flux in the optical fiber section I 8 and the optical fiber section II 9, a Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained; according to the output signal values and the attenuation difference equation, a relationship diagram between an attenuation difference and a temperature is obtained; and after fitting, an attenuation difference-temperature fitting curve equation is obtained; Step (3): according to the ratio of the Stokes light flux to the anti-Stokes light flux and the attenuation difference-temperature fitting curve equation, a temperature demodulation equation introducing a fitting attenuation difference can be obtained, and measured temperature values of the two optical fiber sections are obtained through the equation; Step (4): located environments of the optical fiber section I 8 and the optical fiber section II 9 are identical, so that Rayleigh noise attenuation coefficient change caused by environment change is avoided; after parameters of a pulse light source, a located environment of a detector and a type of the optical fiber are determined, Rayleigh noise in Stokes light and anti-Stokes light can be regarded as a constant value, so that a relationship equation between the Stokes light flux and the Rayleigh noise, and a relationship equation between the anti-Stokes light flux and the Rayleigh noise are obtained; Step (5): according to positions of the optical fiber section I 8 and the optical fiber section II 9, three groups of data in the output signal values, and a demodulated temperature value, through the temperature demodulation equation introducing the fitting attenuation difference and the relationship equations between the light fluxes and the Rayleigh noise, a Rayleigh noise value 1s obtained; and Step (6): according to the temperature demodulation equation introducing the fitting attenuation difference and the relationship equation between the light fluxes and the Rayleigh noise, by combining with the Rayleigh noise value, a final temperature demodulation equation introducing the fitting attenuation difference and further eliminating the Rayleigh noise is obtained.
Preferably, the ratio of the Stokes light flux to the anti-Stokes light flux in the optical fiber is: I(T) = Pl) = (exp [oa] exp (Ast - Aas) dus(1) kT: | in the Step (2), the Stokes light and anti-Stokes light attenuation coefficient difference equation is: As — Oa = In (7(7% - 10) / L— 210) In (7 (Tre) in the Step (2), the attenuation difference-temperature fitting curve equation is: Aa =kKT +b. and in the Step (3), the temperature demodulation equation introducing the fitting attenuation difference is:
Ti= ce [In An) _ [Ac + loAar] + LES hAv (Tw) Tho wherein fs is a Stokes light flux; %as is an anti-Stokes light flux; / is a distance of a certain measuring point on the optical fiber; L is a total length of a temperature measuring optical fiber; C is a constant including a detection efficiency of the detector, a relative Raman gain and the like; Kg is a Boltzmann constant; h is a Planck constant; Av is a Raman frequency shift; ag is the Stokes light attenuation coefficient; as is the anti-Stokes light attenuation coefficient; T is the measured temperature value; and k and b are multinomial coefficients of the fitting curve.
Preferably, in the Step (4), the relationship equation between the Stokes light flux and the Rayleigh noise is: ¢s(!) = Dist (1) + Örst and the relationship equation between the anti-Stokes light flux and the Rayleigh noise IS: Pas) = Gras({) + Pras and in the Step (6), the final temperature demodulation equation introducing the fitting attenuation difference and further eliminating the Rayleigh noise is: 7) = (fo | 20-2: / pitt | — [Aar + lohan] + Ly hAv das(!) — (ras gas(1o) — as Tio wherein ¢ 1s the Rayleigh noise in the Stokes light, and das is the Rayleigh noise in the anti-Stokes light.
Compared with the prior art, the temperature self-correction method has the beneficial effects that: in the invention, the Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained through the temperature demodulation principle; the attenuation coefficient difference-temperature fitting curve equation is obtained through the fitting curve; the temperature demodulation equation is obtained through the fitting curve equation and the ratio of the light fluxes; after demodulation, primary correction of the temperature is realized; then, the Rayleigh noise is solved by combining with the relationship between the Stokes light and anti-Stokes light signals and the Rayleigh noise; a corrected temperature demodulation formula is further obtained; and re-correction is realized after demodulation. Compared with a conventional method for eliminating the Rayleigh noise, the temperature self-correction method has the advantages that a temperature correction amount is improved; the precise measurement 5 of the temperature is realized; an error problem caused by processing by regarding that Stokes light and anti-Stokes light attenuation coefficients are approximately equal is solved; and the requirement of precise detection of the temperature in a goaf and an adjacent old goaf of a coal mine is met.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is flow diagram of a temperature self-correction method by using a fitting attenuation difference in a distributed optical fiber Raman temperature measuring system; FIG. 2 is a device logical connection diagram of the temperature self-correction method by using the fitting attenuation difference in the distributed optical fiber Raman temperature measuring system; FIG. 3 is an attenuation difference fitting curve diagram of the temperature self-correction method by using the fitting attenuation difference in the distributed optical fiber Raman temperature measuring system; and FIG. 4 is a temperature correction diagram of the temperature self-correction method by using the fitting attenuation difference in the distributed optical fiber Raman temperature measuring system.
In the drawings, each reference number represents following parts:
1. industrial control computer, 2. high-speed pulse light source, 3. 1*3 Raman wavelength division multiplexer, 4. double-channel DTS special APD module, 5. high-speed data acquisition card, 6. sensing optical fiber, 7. constant-temperature water bath box, 8. optical fiber section I, and 9. optical fiber section II.
DETAILED DESCRIPTION The following further explains and describes the invention through specific embodiments. The invention provides a temperature self-correction method by using a fitting attenuation difference in a distributed optical fiber Raman temperature measuring system.
As shown in FIG. 1-FIG.4, the temperature self-correction method by using the fitting attenuation difference in the distributed optical fiber Raman temperature measuring system is provided.
The temperature correction method comprises the following steps that: Step (1): a single-mode optical fiber with a total length being L is taken to be used as a sensing optical fiber 6; an optical fiber section I 8 and an optical fiber section II 9 with the same length on the sensing optical fiber 6 are put into a thermostat 7, a distance from a center point of the optical fiber section I 8 to a head end of the sensing optical fiber 6 is identical to a distance from a center point of the optical fiber section IT 9 to a tail end of the sensing optical fiber 6, and other parts of the sensing optical fiber 6 are put in a room temperature environment, a temperature control range of the thermostat 7 is set; a temperature is sequentially increased from a minimum value of the temperature control range to a maximum value of the temperature control range according to the same temperature interval; and corresponding output signal values after each time of temperature change are measured by the distributed optical fiber Raman temperature measuring system; Step (2): according to a ratio of a Stokes light flux to an anti-Stokes light flux in the optical fiber section I 8 and the optical fiber section II 9, a Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained; according to the output signal values and the attenuation difference equation, a relationship diagram between an attenuation difference and a temperature is obtained; and after fitting, an attenuation difference-temperature fitting curve equation is obtained; Step (3): according to the ratio of the Stokes light flux to the anti-Stokes light flux and the attenuation difference-temperature fitting curve equation, a temperature demodulation equation introducing a fitting attenuation difference can be obtained, and measured temperature values of the two optical fiber sections are obtained through the equation; Step (4): located environments of the optical fiber section I 8 and the optical fiber section II 9 are identical, so that Rayleigh noise attenuation coefficient change caused by environment change is avoided; after parameters of a pulse light source, a located environment of a detector and a type of the optical fiber are determined, Rayleigh noise in Stokes light and anti-Stokes light can be regarded as a constant value, so that a relationship equation between the Stokes light flux and the Rayleigh noise, and a relationship equation between the anti-Stokes light flux and the Rayleigh noise are obtained; Step (5): according to positions of the optical fiber section I 8 and the optical fiber section II 9, three groups of data in the output signal values, and a demodulated temperature value, through the temperature demodulation equation introducing the fitting attenuation difference and the relationship equations between the light fluxes and the Rayleigh noise, a Rayleigh noise value is obtained; and Step (6): according to the temperature demodulation equation introducing the fitting attenuation difference and the relationship equation between the light fluxes and the Rayleigh noise, by combining with the Rayleigh noise value, a final temperature demodulation equation introducing the fitting attenuation difference and further eliminating the Rayleigh noise is obtained. The Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained through the temperature demodulation principle; the attenuation coefficient difference-temperature fitting curve equation is obtained through the fitting curve; the temperature demodulation equation is obtained through the fitting curve equation and the ratio of the light fluxes; after demodulation, primary correction of the temperature is realized; then, the Rayleigh noise is solved by combining with the relationship between the Stokes light and anti-Stokes light signals and the Rayleigh noise; a corrected temperature demodulation formula is further obtained; and re-correction is realized after demodulation, and the goal of temperature self-correction is achieved. Compared with a conventional method for eliminating the Rayleigh noise, the temperature self-correction method has the advantages that a temperature correction amount is improved; the precise measurement of the temperature is realized; an error problem caused by processing by regarding that Stokes light and anti-Stokes light attenuation coefficients are approximately equal is solved; and the requirement of precise detection of the temperature in a goaf and an adjacent old goaf of a coal mine is met.
The ratio of the Stokes light flux to the anti-Stokes light flux in the optical fiber is: I(T) = Ol) = Cexp = eXP (Olst-Olas)l Pas(1) ksT: == in the Step (2), the Stokes light and anti-Stokes light attenuation coefficient difference equation is: In JI Tr ~ Ja . In (7 (Tro) in the Step (2), the attenuation difference-temperature fitting curve equation is: Aa =kKT +b. and in the Step (3), the temperature demodulation equation introducing the fitting attenuation difference is: KB Ia) | Ti={— (in ZE) — [Aar +loAon]+ 3" hAv I (Ti) Tio wherein ¢s 1s a Stokes light flux; ós is an anti-Stokes light flux; / is a distance of a certain measuring point on the optical fiber; L is a total length of a temperature measuring optical fiber; C is a constant including a detection efficiency of the detector, a relative Raman gain and the like; Kgis a Boltzmann constant; h is a Planck constant; Av is a Raman frequency shift; os is the Stokes light attenuation coefficient; Oasis the anti-Stokes light attenuation coefficient; T is the measured temperature value; and k and bare multinomial coefficients of the fitting curve; in the Step (4), the relationship equation between the Stokes light flux and the Rayleigh noise is: Ós(!) = Dist (1) + Prt and the relationship equation between the anti-Stokes light flux and the Rayleigh noise is: Gas!) = Gras!) + Pras and in the Step (6), the final temperature demodulation equation introducing the fitting attenuation difference and further eliminating the Rayleigh noise is: ks (7) — st (70) — dst | _ LNE BI) Nee hAv hs(/ ) — Pras das(! 0) - Pras Tio wherein ¢ is the Rayleigh noise in the Stokes light, and ms is the Rayleigh noise in the anti-Stokes light.
In a use process, an industrial control computer controls a high-speed pulse light source 2 through a serial port.
Pulse light output by the high-speed pulse light source 2 is injected into the sensing optical fiber 6 through a wavelength division multiplexing coupling wave filtering module.
Through the optical fiber section I and the optical fiber section II put into the thermostat 7, various weak backscattering light is generated in the sensing optical fiber 6. After the separation by the wavelength division multiplexing coupling wave filtering module of a 1x3 Raman wavelength division multiplexer 3, temperature-sensitive anti-Stokes Raman scattering light and temperature-insensitive Stokes Raman scattering light are obtained.
A double-channel DTS special APD module 4 converts two kinds of received weak scattering light signals into electric signals and amplifies the electric signals.
When sending out the pulse light, the high-speed pulse light source 2 triggers a high-speed data acquisition card 5. The high-speed data acquisition card 5 starts to collect signals output by the double-channel DTS special APD module 4, and then transmits the two paths of collected electric signals to the industrial control computer 1 for temperature demodulation operation.
Based on the above, according to the embodiment of the invention, the Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained through the temperature demodulation principle; the attenuation coefficient difference-temperature fitting curve equation is obtained through the fitting curve; the temperature demodulation equation is obtained through the fitting curve equation and the ratio of the light fluxes; after demodulation, the primary correction of the temperature is realized; then, the Rayleigh noise is solved by combining with the relationship between the Stokes light and anti-Stokes light signals and the Rayleigh noise; the corrected temperature demodulation formula is further obtained; and re-correction is realized after demodulation.
Compared with the conventional method for eliminating the Rayleigh noise, the temperature self-correction method has the advantages that the temperature correction amount is improved; the precise measurement of the temperature is realized, the error problem caused by processing by regarding that the Stokes light and anti-Stokes light attenuation coefficients are approximately equal is solved; the requirement of precise detection of the temperature in the goaf and the adjacent old goaf of the coal mine is met; and the error problem caused by processing by regarding that the two attenuation coefficients are approximately equal is solved.
The above scheme is subjected to feasibility verification by combining with concrete experiment data hereafter, and detail descriptions are shown as follows: According to a verification experiment of the invention, the optical fiber section I and the optical fiber section II, respectively having distances being 25 m from the head end and the tail end, on the temperature measuring optical fiber 6 with the total length being 170 m are used and are put into the thermostat 7; the thermostat is used for controlling the temperature to be sequentially raised to obtain the output signal values; the attenuation coefficient difference is obtained through demodulation; and after fitting, the attenuation difference-temperature fitting curve equation is obtained: Aa(T)=7.8508::107T-1.3532x10°.
The temperature obtained through demodulation by using the temperature demodulation formula introducing the fitting attenuation difference is shown as a curve b in FIG. 4. A curve a is a temperature curve obtained through demodulation by processing by regarding that the attenuation differences are approximately equal. The solved Rayleigh noise ós 1s 62.5517, and the solved Rayleigh noise ras is 28.7723. A final temperature curve obtained through demodulation after fitting attenuation difference introduction and further Rayleigh noise elimination is shown as a curve d in the FIG. 4. A curve c is a temperature curve obtained through demodulation after Rayleigh noise elimination and after the processing by regarding that the attenuation differences are approximately equal.
As shown in the FIG. 4, we can see that compared with a condition of not introducing the fitting attenuation difference, the condition of introducing the fitting attenuation difference realizes the obvious temperature rise, and compared with a condition of eliminating the Rayleigh noise without fitting attenuation difference introduction, the condition of eliminating Rayleigh noise after fitting attenuation difference introduction realizes the temperature more similar to a real value, and the measured temperature 1s corrected. The feasibility of the method is verified.
It is apparent to a person skilled in the art that the invention is not limited to details in the foregoing exemplary embodiments, and the invention can be implemented in another specific form without departing from the spirit or basic features of the invention. Therefore, the embodiments should be considered to be exemplary in all respects and not limitative. The scope of the invention is not defined by the foregoing description but by the appended claims.
The invention is intended to include all the variations that are equivalent in significance and scope to the claims.
No reference numerals in the claims should be considered as limitations to the related claims.
In addition, it should be understood that, although this specification is described according to each implementation, each implementation may not include only one independent technical solution.
The description manner of this specification is merely for clarity.
This specification should be considered as a whole by a person skilled in the art, and the technical solution in each embodiment may also be properly combined, to form other implementations that can be understood by the person skilled in the art.
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| CN111141413B (en) * | 2019-12-26 | 2020-11-10 | 武汉新楚电力集团有限公司 | Distributed optical fiber temperature measurement system and method based on double-end temperature calibration |
| CN111207857B (en) * | 2020-01-16 | 2021-02-26 | 国兴汇金(深圳)科技有限公司 | Method for measuring optical fiber length by using distributed optical fiber temperature sensor |
| CN111337160A (en) * | 2020-05-06 | 2020-06-26 | 杭州山旭光电有限公司 | Distributed optical fiber temperature measurement system based on double-end demodulation |
| CN111795759A (en) * | 2020-06-09 | 2020-10-20 | 许昌许继软件技术有限公司 | Method and system for dispersion correction of distributed Raman fiber temperature measurement system |
| CN112050967B (en) * | 2020-08-05 | 2022-04-05 | 中电科思仪科技股份有限公司 | Optical fiber temperature automatic calibration and compensation method of optical fiber temperature distribution tester |
| CN112629703B (en) * | 2020-11-20 | 2023-08-11 | 中海石油(中国)有限公司湛江分公司 | Method for processing distributed optical fiber temperature measurement data and improving precision |
| CN112857612B (en) * | 2021-04-14 | 2023-03-31 | 西安和其光电科技股份有限公司 | Distributed optical fiber temperature measurement calculation method |
| CN115931168B (en) * | 2023-03-13 | 2023-06-16 | 之江实验室 | A Compensation Method for Attenuation Difference of Distributed Optical Fiber Temperature Sensing System |
| CN117606643B (en) * | 2023-11-17 | 2024-05-31 | 中国三峡新能源(集团)股份有限公司 | Distributed optical fiber temperature measurement and noise reduction method, system, equipment and medium |
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| JP5743200B2 (en) * | 2011-05-16 | 2015-07-01 | 横河電機株式会社 | Optical fiber temperature distribution measuring device |
| JP2013092388A (en) * | 2011-10-24 | 2013-05-16 | Yokogawa Electric Corp | Fiber temperature distribution measurement device |
| CN102901583A (en) * | 2012-08-07 | 2013-01-30 | 北京航空航天大学 | Distributed temperature measurement system based on optical fiber radiation attenuation temperature dependency |
| CN104568228B (en) * | 2015-01-04 | 2017-04-12 | 山东微感光电子有限公司 | Calibration method when attenuation coefficients of DTS are different |
| CN104864979B (en) * | 2015-06-16 | 2016-11-16 | 北京航天易联科技发展有限公司 | A kind of modification method of distributed Raman fiber temp measuring system measurement error |
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| US8496376B2 (en) * | 2007-07-18 | 2013-07-30 | Sensortran, Inc. | Dual source auto-correction in distributed temperature systems |
| CN109580033A (en) * | 2018-12-03 | 2019-04-05 | 三峡大学 | A kind of concrete dam distributed optical fiber temperature measurement data error compensation method |
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| Title |
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| NICK VAN DE GIESEN ET AL: "Double-Ended Calibration of Fiber-Optic Raman Spectra Distributed Temperature Sensing Data", SENSORS, vol. 12, no. 12, 27 April 2012 (2012-04-27), pages 5471 - 5485, XP055255217, DOI: 10.3390/s120505471 * |
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