CN110231106A - A kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method - Google Patents
A kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method Download PDFInfo
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- G—PHYSICS
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- 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
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- 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
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The temperature for being fitted decaying difference the present invention relates to a kind of distributed fiber Raman temp measuring system reviews one's lessons by oneself correction method, the present invention obtains stokes light and anti-Stokes light attenuation coefficient eikonal equation by temperature demodulation principle, fit curve equation of the attenuation coefficient difference about temperature is obtained by matched curve, pass through the ratio between fit curve equation and luminous flux, obtain temperature demodulation equation, the preliminary amendment of temperature is realized after demodulation, in conjunction with the relationship of stokes light and anti-Stokes optical signal and rayleigh noise, solve rayleigh noise, further obtain revised temperature demodulation formula, it realizes after demodulation and corrects again, achieve the purpose that temperature self-correction, temperature adjustmemt amount is improved compared with eliminating rayleigh noise with conventional method, realize the precise measurement of temperature, it avoids stokes light place approximately equal with anti-Stokes light attenuation coefficient Bring error problem is managed, the accurate detection of coal mine gob and adjacent old dead zone temperature is met.
Description
Technical field
The present invention relates to Fibre Optical Sensor Instrument technology fields, and in particular to a kind of distributed fiber Raman temp measuring system fitting
The temperature of decaying difference reviews one's lessons by oneself correction method.
Background technique
As economy continues the development of high speed, demand of the China to the energy is increasing, in order to guarantee the exploitation peace of coal mine
Entirely, spontaneous combustion is prevented, it is necessary to detect to coal mine gob and adjacent old dead zone temperature, coal mine autoignition temperature monitors at present
The distributed fiber Raman temp measuring system of use, due in Raman diffused light stokes light and anti-Stokes light to temperature
It is sensitive different, the position of each point and temperature on optical fiber are accurately measured by ratio demodulation method combination optical time domain reflection technology and believed
Breath realizes the detection to fiber optic temperature field.
Since Stokes Raman scattering light in optical fiber and the wavelength difference of anti-Stokes Raman scattering light can generate this
Matter loss, fibre-optical bending, stress and variation of ambient temperature can generate added losses, therefore Stokes Raman scatters light and instead this
Lentor Raman scattering optical attenuation is different, and in temperature demodulation, the two is often subjected to approximately equal processing or is directly used
Empirical value, this makes demodulation result generate large error, therefore a kind of new method is needed to overcome attenuation coefficient bring temperature error
Problem.
Summary of the invention
The temperature for being fitted decaying difference the object of the present invention is to provide a kind of distributed fiber Raman temp measuring system reviews one's lessons by oneself pros
Method has the advantages of replacing essence loss and added losses with fitting decaying difference in temperature demodulation, solves and two are declined
Subtract coefficient and carries out approximately equal processing bring error problem.
A kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method, and temperature correction includes
Following steps；
Step (1): take the single mode optical fiber of an overall length L as sensor fibre 6, by the equal length on sensor fibre 6
Fiber segment I 8 and fiber segment II 9 are placed in insulating box 7, and the central point of fiber segment I 8 is at a distance from 6 head end of sensor fibre and optical fiber
The central point of section II 9 is equidistant with 6 end of sensor fibre, and the other parts of sensor fibre 6 are placed under room temperature environment, setting
The temperature-control range of insulating box 7, and it is incremented by successively to maximum value from temperature-control range minimum value by identical temperature interval, pass through distribution
Optical fiber Raman thermometry system measures corresponding output signal value after each temperature change；
Step (2): according in fiber segment I 8 and fiber segment II 9 Stokes luminous flux and anti-Stokes luminous flux it
Than obtaining the attenuation coefficient eikonal equation of Stokes and anti-Stokes light, according to output signal value and decaying eikonal equation, obtaining
The relational graph of decaying difference and temperature obtains fit curve equation of the decaying difference about temperature after fitting；
Step (3): according to the ratio between luminous flux of stokes light and anti-Stokes light and its decaying difference about temperature
Fit curve equation can get the temperature demodulation equation for introducing fitting decaying difference, and obtain two sections of optical fiber by the equation and be surveyed
Temperature value；
Step (4): the fiber segment I 8 is identical with II 9 local environment of fiber segment, avoids auspicious caused by environmental change
The variation of the attenuation coefficient of sharp noise, and after the determination of the type of the environment locating for the parameter of light-pulse generator, detector and optical fiber,
Contained rayleigh noise is considered as definite value in Stokes and anti-Stokes light, to obtain Stokes and anti-stoke
The relation equation of this luminous flux and rayleigh noise；
Step (5): it according to three groups of data in the position of fiber segment I 8 and fiber segment II 9, output signal value and demodulates
Temperature value, by introduce be fitted decaying difference temperature demodulation equation and luminous flux and rayleigh noise relation equation, obtain it is auspicious
Sharp noise figure；
Step (6): being fitted decay the temperature demodulation equation of difference and the relation equation of luminous flux and rayleigh noise according to introducing,
In conjunction with rayleigh noise value, final introducing fitting decaying difference and the further temperature demodulation equation for eliminating rayleigh noise are obtained.
Preferably, the ratio between Stokes luminous flux and anti-Stokes luminous flux in optical fiber are as follows:
The attenuation coefficient eikonal equation of Stokes and anti-Stokes light in step (2) are as follows:
Fit curve equation of the decaying difference about temperature in step (2) are as follows:
Δ α=kT+b；
The temperature demodulation equation of fitting decaying difference is introduced in step (3) are as follows:
Wherein, φstFor Stokes luminous flux, φasFor anti-Stokes luminous flux；L be optical fiber on certain measurement point away from
From L is thermometric light overall length, and C is constant, the detection efficient including detector, opposite Raman gain etc.；KBIt is normal for Boltzmann
Number, h are planck constant, and Δ v is Raman frequency shift, αstFor Stokes light attenuation coefficient, αasFor anti-Stokes optical attenuation system
Number, T are measured temperature value, and k, b are the multinomial coefficient of matched curve.
Preferably, the relation equation of Stokes and anti-Stokes luminous flux and rayleigh noise in step (4) are as follows:
φst(l)=φtst(l)+φrst,
φas(l)=φtas(l)+φras；
Final introducing fitting decaying is poor in step (6) and further eliminates the temperature demodulation equation of rayleigh noise are as follows:
Wherein φrstFor rayleigh noise contained by stokes light, φrasFor rayleigh noise contained by anti-Stokes light.
Compared with prior art, its advantages are embodied in:
The present invention obtains stokes light and anti-Stokes light attenuation coefficient eikonal equation by temperature demodulation principle, passes through
Matched curve obtains fit curve equation of the attenuation coefficient difference about temperature and is obtained by the ratio between fit curve equation and luminous flux
Temperature demodulation equation out realizes the preliminary amendment of temperature after demodulation, in conjunction with stokes light and anti-Stokes optical signal with
The relationship of rayleigh noise, solves rayleigh noise, further obtains revised temperature demodulation formula, realizes after demodulation and repair again
Just, with conventional method eliminate rayleigh noise compared with improve temperature adjustmemt amount, realize the precise measurement of temperature, avoid by
Stokes light processing bring error problem approximately equal with anti-Stokes light attenuation coefficient, meet coal mine gob and
The accurate detection of adjacent old dead zone temperature.
Detailed description of the invention
Fig. 1 is that a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself the flow chart of correction method；
Fig. 2 is that a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself the device logic company of correction method
Map interlinking；
Fig. 3 is that a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself the decaying difference fitting of correction method
Curve graph；
Fig. 4 is that a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself the temperature adjustmemt of correction method
Figure.
In attached drawing, component representated by each label is as follows:
1, industrial control computer, 2, high-speed pulse light source, 3,1 × 3Ramman wavelength division multiplexer, 4, binary channels DTS it is special
With APD mould group, 5, high-speed data acquisition card, 6, sensor fibre, 7, constant water bath box, 8, fiber segment I, 9, fiber segment II.
Specific embodiment
Explanation is further explained to the present invention below by way of specific embodiment.
The temperature that the present invention provides a kind of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method, such as Fig. 1-
Shown in 4, a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method, temperature correction include with
Lower step；
Step (1): take the single mode optical fiber of an overall length L as sensor fibre 6, by the equal length on sensor fibre 6
Fiber segment I 8 and fiber segment II 9 are placed in insulating box 7, and the central point of fiber segment I 8 is at a distance from 6 head end of sensor fibre and optical fiber
The central point of section II 9 is equidistant with 6 end of sensor fibre, and the other parts of sensor fibre 6 are placed under room temperature environment, setting
The temperature-control range of insulating box 7, and it is incremented by successively to maximum value from temperature-control range minimum value by identical temperature interval, pass through distribution
Optical fiber Raman thermometry system measures corresponding output signal value after each temperature change；
Step (2): according in fiber segment I 8 and fiber segment II 9 Stokes luminous flux and anti-Stokes luminous flux it
Than obtaining the attenuation coefficient eikonal equation of Stokes and anti-Stokes light, according to output signal value and decaying eikonal equation, obtaining
The relational graph of decaying difference and temperature obtains fit curve equation of the decaying difference about temperature after fitting；
Step (3): according to the ratio between luminous flux of stokes light and anti-Stokes light and its decaying difference about temperature
Fit curve equation can get the temperature demodulation equation for introducing fitting decaying difference, and obtain two sections of optical fiber by the equation and be surveyed
Temperature value；
Step (4): the fiber segment I 8 is identical with II 9 local environment of fiber segment, avoids auspicious caused by environmental change
The variation of the attenuation coefficient of sharp noise, and after the determination of the type of the environment locating for the parameter of light-pulse generator, detector and optical fiber,
Contained rayleigh noise is considered as definite value in Stokes and anti-Stokes light, to obtain Stokes and anti-stoke
The relation equation of this luminous flux and rayleigh noise；
Step (5): it according to three groups of data in the position of fiber segment I 8 and fiber segment II 9, output signal value and demodulates
Temperature value, by introduce be fitted decaying difference temperature demodulation equation and luminous flux and rayleigh noise relation equation, obtain it is auspicious
Sharp noise figure；
Step (6): being fitted decay the temperature demodulation equation of difference and the relation equation of luminous flux and rayleigh noise according to introducing,
In conjunction with rayleigh noise value, final introducing fitting decaying difference and the further temperature demodulation equation for eliminating rayleigh noise are obtained, is led to
Excess temperature demodulation principle obtains stokes light and anti-Stokes light attenuation coefficient eikonal equation, is decayed by matched curve
Fit curve equation of the coefficient difference about temperature obtains temperature demodulation equation by the ratio between fit curve equation and luminous flux, solution
The preliminary amendment that temperature is realized after tune, in conjunction with the relationship of stokes light and anti-Stokes optical signal and rayleigh noise, solution
Rayleigh noise out further obtains revised temperature demodulation formula, realizes after demodulation and correct again, reaches temperature self-correction
Purpose improves temperature adjustmemt amount compared with conventional method elimination rayleigh noise, realizes the precise measurement of temperature, avoid
By stokes light processing bring error problem approximately equal with anti-Stokes light attenuation coefficient, coal mine gob is met
And the accurate detection of adjacent old dead zone temperature.
The ratio between Stokes luminous flux and anti-Stokes luminous flux in optical fiber are as follows:
The attenuation coefficient eikonal equation of Stokes and anti-Stokes light in step (2) are as follows:
Fit curve equation of the decaying difference about temperature in step (2) are as follows:
Δ α=kT+b；
The temperature demodulation equation of fitting decaying difference is introduced in step (3) are as follows:
Wherein, φstFor Stokes luminous flux, φasFor anti-Stokes luminous flux；L be optical fiber on certain measurement point away from
From L is thermometric light overall length, and C is constant, the detection efficient including detector, opposite Raman gain etc.；KBIt is normal for Boltzmann
Number, h are planck constant, and Δ v is Raman frequency shift, αstFor Stokes light attenuation coefficient, αasFor anti-Stokes optical attenuation system
Number, T are measured temperature value, and k, b are the multinomial coefficient of matched curve.
The relation equation of Stokes and anti-Stokes luminous flux and rayleigh noise in step (4) are as follows:
φst(l)=φtst(l)+φrst,
φas(l)=φtas(l)+φras；
Final introducing fitting decaying is poor in step (6) and further eliminates the temperature demodulation equation of rayleigh noise are as follows:
Wherein, φrstFor rayleigh noise contained by stokes light, φrasFor rayleigh noise contained by anti-Stokes light.
In use, industrial personal computer controls high-speed pulse light source 2 by serial ports, the pulsed light that high-speed pulse light source 2 exports passes through
Wavelength-division multiplex couples in filter module injection sensor fibre 6, by the fiber segment I and fiber segment II in merging insulating box 7, is passing
A variety of faint back-scattering lights are generated in photosensitive fine 6 through 1 × 3Ramman wavelength division multiplexer, 3 wavelength-division multiplex coupling filter module point
Thermally sensitive anti-Stokes Raman scattering light and temperature-resistant Stokes Raman scattering light are obtained from after, it is double
Receive two kinds of faint scattered light signals are converted to electric signal and amplified, high-speed pulse by the dedicated APD mould group 4 of channel DTS
Light source 2 triggers high-speed data acquisition card 5 while issuing pulsed light, and high-speed data acquisition card 5 starts dedicated to binary channels DTS
APD mould group 4 exports earth signal and is acquired, and collected two path signal is then transmitted to industrial personal computer 1 and carries out temperature demodulation
Operation.
In conclusion the present invention of the embodiment of the present invention obtains stokes light and anti-Stokes by temperature demodulation principle
Light attenuation coefficient eikonal equation obtains fit curve equation of the attenuation coefficient difference about temperature by matched curve, bent by fitting
The ratio between line equation and luminous flux obtain temperature demodulation equation, the preliminary amendment of temperature are realized after demodulation, in conjunction with stokes light
With the relationship of anti-Stokes optical signal and rayleigh noise, rayleigh noise is solved, it is public further to obtain revised temperature demodulation
Formula is realized after demodulation and is corrected again, is improved temperature adjustmemt amount compared with conventional method elimination rayleigh noise, is realized temperature
Precise measurement, avoid and ask stokes light processing bring error approximately equal with anti-Stokes light attenuation coefficient
Topic, meets the accurate detection of coal mine gob and adjacent old dead zone temperature, solves two attenuation coefficients carrying out approximate phase
Deng processing bring error problem.
Feasibility verifying is carried out to above scheme below with reference to specific experimental data, described below:
Confirmatory experiment of the present invention is using the light with head and the tail both ends distance 25m respectively on the temperature-measuring optical fiber 6 of root overall length 170m
Fine section I, II is put into insulating box 7, is successively increased with insulating box control temperature, obtains output signal value, and it is poor to demodulate attenuation coefficient,
Fit curve equation of the decaying difference about temperature is obtained after fitting are as follows:
Δ α (T)=7.8508 × 10-7T-1.3532×10-5
The b curve in temperature such as Fig. 4 that temperature demodulation formula by being introduced into decaying difference demodulates, a curve is that will decay
Difference is the approximately equal temperature curve for handling and demodulating, the rayleigh noise φ solvedrstAnd φrasRespectively 62.5517,
28.7723, the final d for being introduced into fitting decaying difference and further eliminating in the temperature curve such as Fig. 4 demodulated after rayleigh noise is bent
Line, c curve are that will decay after difference does approximately equal processing to eliminate the temperature curve that rayleigh noise demodulates.
As shown in Figure 4, it can be seen that introduce fitting decaying difference temperature compared with being not introduced into and be obviously improved, introduce fitting and decline
Elimination rayleigh noise temperature compared with being not introduced into and eliminating rayleigh noise is corrected closer to true value, measured temperature after subtracting difference,
Demonstrate the feasibility of this method.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms, therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention, and any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (3)
1. a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference reviews one's lessons by oneself correction method, it is characterised in that: temperature is repaired
Correction method includes the following steps；
Step 1: taking the single mode optical fiber of an overall length L as sensor fibre, by I He of fiber segment of the equal length on sensor fibre
Fiber segment II is placed in insulating box, the central point of fiber segment I at a distance from sensor fibre head end and the central point of fiber segment II with
Sensor fibre end is equidistant, and the other parts of sensor fibre are placed under room temperature environment, and the temperature-control range of insulating box is arranged,
And it is incremented by successively to maximum value from temperature-control range minimum value by identical temperature interval, it is surveyed by distributed fiber Raman temp measuring system
Corresponding output signal value after each temperature change out；
Step 2: according to the Stokes luminous flux and the ratio between anti-Stokes luminous flux in fiber segment I and fiber segment II, obtaining
It is poor to obtain decaying according to output signal value and decaying eikonal equation for the attenuation coefficient eikonal equation of Stokes and anti-Stokes light
With the relational graph of temperature, fit curve equation of the decaying difference about temperature is obtained after fitting；
Step 3: bent about the fitting of temperature according to the ratio between luminous flux of stokes light and anti-Stokes light and its decaying difference
Line equation can get the temperature demodulation equation for introducing fitting decaying difference, and obtain two sections of optical fiber measured temperature values by the equation；
Step 4: the fiber segment I is identical with II local environment of fiber segment, avoids rayleigh noise caused by environmental change
The variation of attenuation coefficient, and after the determination of the type of the environment locating for the parameter of light-pulse generator, detector and optical fiber, Stokes
And contained rayleigh noise is considered as definite value in anti-Stokes light, to obtain Stokes and anti-Stokes luminous flux
With the relation equation of rayleigh noise；
Step 5: according to three groups of data in the position of fiber segment I and fiber segment II, output signal value and the temperature value demodulated,
By introducing the relation equation of the temperature demodulation equation and luminous flux and rayleigh noise that are fitted decaying difference, rayleigh noise value is obtained；
Step 6: according to the relation equation for introducing the temperature demodulation equation and luminous flux and rayleigh noise that are fitted decaying difference, in conjunction with auspicious
Sharp noise figure obtains final introducing fitting decaying difference and the further temperature demodulation equation for eliminating rayleigh noise, passes through the solution
Equation is adjusted to complete temperature self-correction.
2. a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference according to claim 1 reviews one's lessons by oneself pros
Method, it is characterised in that: the ratio between Stokes luminous flux and anti-Stokes luminous flux in fiber segment I and fiber segment II are as follows:
The attenuation coefficient eikonal equation of Stokes and anti-Stokes light in step 2 are as follows:
Fit curve equation of the difference that decays in step 2 about temperature are as follows:
Δ α=kT+b；
The temperature demodulation equation of fitting decaying difference is introduced in step 3 are as follows:
Wherein, φstFor Stokes luminous flux, φasFor anti-Stokes luminous flux；L is the distance of certain measurement point on optical fiber, L
For thermometric light overall length, C is constant, the detection efficient including detector, opposite Raman gain etc., KBFor Boltzmann constant, h
For planck constant, Δ v is Raman frequency shift, αstFor Stokes light attenuation coefficient, αasFor anti-Stokes light attenuation coefficient, T
For measured temperature value, k, b are the multinomial coefficient of matched curve.
3. a kind of temperature of distributed fiber Raman temp measuring system fitting decaying difference according to claim 1 reviews one's lessons by oneself pros
Method, it is characterised in that: the relation equation of Stokes and anti-Stokes luminous flux and rayleigh noise in step 4 are as follows:
φst(l)=φtst(l)+φrst
φas(l)=φtas(l)+φras；
Final introducing fitting decaying is poor in step 6 and further eliminates the temperature demodulation equation of rayleigh noise are as follows:
Wherein, φrstFor rayleigh noise contained by stokes light, φrasFor rayleigh noise contained by anti-Stokes light.
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| NL2024922A NL2024922B1 (en) | 2019-07-08 | 2020-02-17 | Temperature self-correction method by using fitting attenuation difference in distributed optical fiber raman temperature measuring system |
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| CN111141413A (en) * | 2019-12-26 | 2020-05-12 | 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 |
| CN111207857A (en) * | 2020-01-16 | 2020-05-29 | 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 |
| 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 |
| CN112050967A (en) * | 2020-08-05 | 2020-12-08 | 中电科仪器仪表有限公司 | Optical fiber temperature automatic calibration and compensation method of optical fiber temperature distribution tester |
| 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 |
| CN112629703A (en) * | 2020-11-20 | 2021-04-09 | 中法渤海地质服务有限公司湛江分公司 | Distributed optical fiber temperature measurement data processing and precision improving method |
| 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 |
| CN112857612A (en) * | 2021-04-14 | 2021-05-28 | 西安和其光电科技股份有限公司 | Distributed optical fiber temperature measurement calculation method and system |
| CN115931168A (en) * | 2023-03-13 | 2023-04-07 | 之江实验室 | Attenuation difference compensation method for distributed optical fiber temperature sensing system |
| CN115931168B (en) * | 2023-03-13 | 2023-06-16 | 之江实验室 | Attenuation difference compensation method of distributed optical fiber temperature sensing system |
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| CN110231106B (en) | 2020-10-09 |
| NL2024922B1 (en) | 2020-09-30 |
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