CN114577367B - Optical fiber temperature sensor calibration method and device and computer equipment - Google Patents
Optical fiber temperature sensor calibration method and device and computer equipment Download PDFInfo
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Abstract
The disclosed embodiments relate to a method, an apparatus, a computer device, a storage medium, and a computer program product for calibrating an optical fiber temperature sensor. The method comprises the following steps: acquiring a Stokes curve and an anti-Stokes curve of a signal acquired by an optical fiber to be calibrated and temperatures of a plurality of loss points of the optical fiber to be calibrated; determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-optical fibers of the loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points; and determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature. By adopting the method, the calibration operation flow of the optical fiber temperature sensor can be simplified, the workload is saved, and the calibration efficiency is improved.
Description
Technical Field
The disclosed embodiments relate to the field of optical fiber sensing technologies, and in particular, to a method and an apparatus for calibrating an optical fiber temperature sensor, a computer device, a storage medium, and a computer program product.
Background
The distributed optical fiber temperature sensor is an optical fiber sensor system for measuring the spatial temperature field distribution in real time, has the characteristics of intrinsic passivity, electromagnetic interference resistance, continuous linear temperature measurement, corrosion resistance, convenient installation and integration and the like, and is widely applied to online real-time temperature monitoring and fire and gas liquid leakage early warning in the fields of power cables, tunnels, coal mines, oil wells and the like. However, before the distributed optical fiber temperature sensor is used in a specific application scene, calibration is needed, that is, calibration is performed according to a functional relationship between a ratio of light intensity of anti-stokes light and light intensity of stokes light in the optical fiber temperature sensor and temperature.
In the related technology, the measurement optical fiber is usually calibrated by making a certain temperature difference, a worker is required to carry a high-temperature heat source for calibration, and links with more loss points are required to be calibrated in sections, so that the field operation is very inconvenient.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, a storage medium, and a computer program product for calibrating an optical fiber temperature sensor, which simplify the process and improve the efficiency.
In a first aspect, an embodiment of the present disclosure provides a method for calibrating an optical fiber temperature sensor. The method comprises the following steps:
acquiring a Stokes curve and an anti-Stokes curve of a signal acquired by an optical fiber to be calibrated and temperatures of a plurality of loss points of the optical fiber to be calibrated;
determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-optical fibers of the loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points;
and determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature.
In one embodiment, the determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-fibers of the loss point includes:
respectively carrying out attenuation compensation processing on the Stokes curve and the anti-Stokes curve to obtain a processed Stokes curve and a processed anti-Stokes curve;
and determining the proportional coefficient corresponding to the loss point according to the processed Stokes curve and the processed anti-Stokes curve.
In one embodiment, the determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-fibers of the loss point includes:
obtaining corresponding curve values of the Stokes curve and the front and rear sub-optical fibers of the loss point on the anti-Stokes curve;
determining a first ratio and a second ratio according to the curve values, wherein the first ratio is the ratio of the curve value corresponding to a section of sub-optical fiber after the loss point on the Stokes curve to the curve value corresponding to a section of sub-optical fiber before the loss point on the Stokes curve, and the second ratio is the ratio of the curve value corresponding to a section of sub-optical fiber after the loss point on the anti-Stokes curve to the curve value corresponding to a section of sub-optical fiber before the loss point on the anti-Stokes curve;
and determining a proportional coefficient corresponding to the loss point according to the first ratio and the second ratio.
In one embodiment, the determining the scaling factor corresponding to the loss point according to the first ratio and the second ratio includes:
respectively obtaining first ratio coefficients corresponding to other loss points from the initial position of the optical fiber to be calibrated to the loss point and first ratio coefficients corresponding to the loss points, wherein the first ratio coefficients are the ratio of the first ratio and the second ratio corresponding to the loss points;
and determining a second proportionality coefficient of the loss point as a product of the first proportionality coefficient corresponding to the loss point and the first proportionality coefficients corresponding to the other loss points, and taking the second proportionality coefficient as the proportionality coefficient corresponding to the loss point.
In one embodiment, the determining the linear relationship between the measured temperature of each sub-optical fiber section in the sub-optical fibers and the collected signals of the sub-optical fibers according to the proportionality coefficient and the temperature includes:
acquiring the ratio of the anti-stokes light signal value to the stokes light signal value of the reference optical fiber;
acquiring a reference temperature at a preset position of the reference optical fiber and a normal temperature coefficient of the reference optical fiber;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature.
In one embodiment, the determining a linear relationship between the measured temperature of the sub optical fiber and the collected signal of the sub optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature includes:
under the condition that the sub optical fiber is the first section of the starting end of the optical fiber to be calibrated, determining the proportionality coefficient of the sub optical fiber as a fixed value;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In one embodiment, the determining a linear relationship between the measured temperature of the sub optical fiber and the collected signal of the sub optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature includes:
under the condition that the sub optical fiber is not the first section of the starting end of the optical fiber to be calibrated, determining a proportional coefficient of the sub optical fiber corresponding to a loss point of the sub optical fiber close to the starting end of the optical fiber to be calibrated as the proportional coefficient of the sub optical fiber;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient of the sub-optical fiber and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In a second aspect, the embodiment of the present disclosure further provides a device for calibrating an optical fiber temperature sensor. The device comprises:
the device comprises an acquisition module, a calibration module and a calibration module, wherein the acquisition module is used for acquiring a Stokes curve and an anti-Stokes curve of an acquisition signal of an optical fiber to be calibrated and the temperature of a plurality of loss points of the optical fiber to be calibrated;
the coefficient determining module is used for determining a proportional coefficient corresponding to the loss point according to Stokes curve values and anti-Stokes curve values corresponding to front and rear sub-optical fibers of the loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points;
and the relation determining module is used for determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature.
In one embodiment, the coefficient determining module includes:
the attenuation compensation module is used for respectively carrying out attenuation compensation processing on the Stokes curve and the anti-Stokes curve to obtain a processed Stokes curve and a processed anti-Stokes curve;
and the determining module is used for determining the proportional coefficient corresponding to the loss point according to the processed Stokes curve and the processed anti-Stokes curve.
In one embodiment, the coefficient determining module includes:
the acquisition module is used for acquiring curve values corresponding to the Stokes curve and the front and rear sub-fibers of the loss points on the anti-Stokes curve;
a first determining module, configured to determine a first ratio and a second ratio according to the curve value, where the first ratio is a ratio of a curve value corresponding to a section of sub-fiber after a loss point on the stokes curve to a curve value corresponding to a section of sub-fiber before the loss point on the stokes curve, and the second ratio is a ratio of a curve value corresponding to a section of sub-fiber after a loss point on the anti-stokes curve to a curve value corresponding to a section of sub-fiber before the loss point on the anti-stokes curve;
and the second determining module is used for determining the proportional coefficient corresponding to the loss point according to the first ratio and the second ratio.
In one embodiment, the second determining module includes:
an obtaining module, configured to obtain a first ratio coefficient corresponding to other loss points from an initial position of the optical fiber to be calibrated to the loss point and a first ratio coefficient corresponding to the loss point, where the first ratio coefficient is a ratio of a first ratio corresponding to the loss point to a second ratio;
and the determining submodule is used for determining that the second proportional coefficient of the loss point is the product of the first proportional coefficient corresponding to the loss point and the first proportional coefficient corresponding to the other loss points, and taking the second proportional coefficient as the proportional coefficient corresponding to the loss point.
In one embodiment, the relationship determination module includes:
the first acquisition module is used for acquiring the ratio of the anti-stokes optical signal value to the stokes optical signal value of the reference optical fiber;
the second acquisition module is used for acquiring the reference temperature at the preset position of the reference optical fiber and the normal temperature coefficient of the reference optical fiber;
and the determining module is used for determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature.
In one embodiment, the determining module includes:
the first determining submodule is used for determining that the proportionality coefficient of the sub optical fiber is a fixed value under the condition that the sub optical fiber is the first section of the starting end of the optical fiber to be calibrated;
the second determining submodule is used for determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature;
and the third determining submodule is used for determining the linear relation between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In one embodiment, the determining module includes:
the fourth determining submodule is used for determining that the proportional coefficient of the sub optical fiber close to the corresponding loss point of the starting end of the optical fiber to be calibrated is the proportional coefficient of the sub optical fiber under the condition that the sub optical fiber is not the first section of the starting end of the optical fiber to be calibrated;
a fifth determining submodule, configured to determine a linear relation constant between the measured temperature of the sub optical fiber and the acquired signal of the sub optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient of the sub optical fiber, and the temperature;
and the sixth determining submodule is used for determining the linear relation between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In a third aspect, an embodiment of the present disclosure further provides a computer device. The computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method for calibrating the optical fiber temperature sensor in any embodiment of the disclosure when executing the computer program.
In a fourth aspect, the disclosed embodiments also provide a computer-readable storage medium. The computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of fiber optic temperature sensor calibration according to any of the embodiments of the present disclosure.
In a fifth aspect, the disclosed embodiments also provide a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of the method of fiber optic temperature sensor calibration according to any of the embodiments of the present disclosure.
According to the optical fiber temperature sensor calibration method, the optical fiber temperature sensor calibration device, the computer equipment, the storage medium and the computer program product, the ratio coefficient value of each section of sub-optical fiber on the optical fiber to be calibrated is determined through the acquired Stokes curve and the anti-Stokes curve of the optical fiber to be calibrated, the ratio coefficient of each loss point is determined according to the ratio coefficient value, and the linear relation between the measured temperature of each section of sub-optical fiber in the optical fiber to be calibrated and the acquired signal is determined according to the ratio coefficient and the acquired temperature of each section of sub-optical fiber. According to the embodiment of the calibration method and the calibration device, the linear relation between the temperature and the collected signal can be determined directly through the collected signal and the collected optical fiber temperature, calibration is completed, the calibration operation flow of the optical fiber temperature sensor is simplified, the workload is saved, and the calibration efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating a method for calibrating an optical fiber temperature sensor in one embodiment;
FIG. 2 is a schematic diagram of a signal acquisition device of an optical fiber temperature sensor according to an embodiment;
FIG. 3 is a schematic diagram of a signal collection curve of an optical fiber temperature sensor in one embodiment;
FIG. 4 is a schematic diagram of a processed collected signal curve of a fiber optic temperature sensor in one embodiment;
FIG. 5 is a schematic flow chart illustrating a method for calibrating an optical fiber temperature sensor according to an embodiment;
FIG. 6 is a block diagram of an apparatus for calibrating an optical fiber temperature sensor according to an embodiment;
FIG. 7 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clearly understood, the embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the embodiments of the disclosure and that no limitation to the embodiments of the disclosure is intended.
In order to facilitate the technical solutions provided by the embodiments of the present disclosure for those skilled in the art to understand, the following description will first explain a background technology for implementing the technical solutions.
In the distributed optical fiber temperature sensor, when demodulating temperature through collected stokes (Stokes light) and anti-Stokes (anti-Stokes light) light intensity values, taking the ratio of the Stokes light intensity values to the anti-Stokes light intensity values, and if the attenuation difference of the Stokes light intensity values and the anti-Stokes light intensity values is not considered, the principle formula is as follows:
in the formula: phi is a s Is the stokes intensity; phi is a unit of as The light intensity is anti-stokes light intensity; k is s And K as Coefficients related to the stokes and anti-stokes light scattering cross sections of the optical fiber respectively; upsilon is s And upsilon as The frequencies of the stokes light scattering photons and the anti-stokes light scattering photons are respectively; h is Planck constant, h =6.63 × 10 –34 J · s; Δ ν is raman shift of the silica fiber, Δ ν =1.32 × 10 13 Hz; k is Boltzmann constant, k =1.38 × 10 –23 J/K; t is the fiber temperature.
The intensity ratio of stokes to anti-stokes is in a linear relation with the temperature of 0-120 ℃, and the formula (1) is linearly converted into the formula (2).
Wherein m is a high temperature proportionality coefficient, and b is a normal temperature coefficient, and is related to an optical fiber material.
In order to counteract the influence of light source fluctuation and APD gain fluctuation, reference fiber is introduced, one section of reference fiber is reserved in the initial end of the fiber, and thermistor or platinum resistor is adopted to measure the temperature T of the reference fiber in real time 0 For the reference fiber
For the measurement of optical fiber
From the formulas (3) and (4)
T 1 For measuring the temperature of the optical fiber, the Raman scattering coefficient between the reference optical fiber and the measuring optical fiber and the loss point are related to the inconsistency of anti-stokes loss and astoke loss. b is a mixture of 0 The normal temperature coefficient of the reference optical fiber is a fixed value and is an internal parameter of the equipment. b 1 The normal temperature coefficient of the optical fiber is measured. Since the thermistor or platinum resistor is used in practical applicationThe actual temperature of the reference fiber has a certain measurement error Δ T, which is introduced into the overall measurement error, as shown in equation (6).
And because of the difference of field optical fiber materials, the difference of wavelengths and the inconsistent loss of loss points to anti-stokes and stokes, m and b need to be matched on project field 2 And calibrating, wherein a worker carries a high-temperature heat source to calibrate a certain temperature difference (the temperature difference is usually more than 50 ℃) produced by the measuring optical fiber, and segmented calibration is needed for links with more loss points.
Based on the technical background described above, embodiments of the present disclosure provide a method, an apparatus, a computer device, a storage medium, and a computer program product for calibrating an optical fiber temperature sensor.
Fig. 1 is a schematic flow chart of a method for calibrating an optical fiber temperature sensor in an embodiment, and referring to fig. 1, a method for calibrating an optical fiber temperature sensor is provided. In this embodiment, the method includes the steps of:
step S101, acquiring a Stokes curve and an anti-Stokes curve of a signal acquired by an optical fiber to be calibrated and temperatures of a plurality of loss points of the optical fiber to be calibrated;
in one example, the acquisition signal may be obtained by an apparatus as shown in fig. 2. Wherein, the drive circuit receives the trigger pulse, drives the Laser (LD) to send out a beam of laser, enter the temperature measuring optical fiber; the backward Raman scattering light in the optical fiber is decomposed into stokes scattering light and anti-stokes scattering light with different wavelengths through a wavelength division multiplexer module (FWDM); the photoelectric conversion is carried out through the photoelectric detection module, the two groups of signals are collected through the data acquisition module, and the signal processing module processes the collected signals to obtain the distribution curve of the temperature along the optical fiber.
In the embodiment of the disclosure, a stokes curve and an anti-stokes curve of the collected signal are obtained, wherein the stokes curve reflects the relationship between the signal intensity value of stokes light and the length of an optical fiber, and the anti-stokes curve reflects the relationship between the signal intensity value of anti-stokes light and the length of the optical fiber. And acquiring the temperatures of a plurality of loss points on the optical fiber to be calibrated, wherein the temperature at the loss point is generally acquired through a thermometer when the calibration is performed, namely, the linear relation between the measured temperature of the section of the sub-optical fiber after the loss point and the acquired signal is determined, and the room temperature at the loss point measured by the thermometer can be used as the temperature at the loss point. In one example, the temperature of the fiber a short distance before and after the loss point can be generally considered to be constant.
Step S102, determining a proportionality coefficient corresponding to the loss point according to Stokes curve values and anti-Stokes curve values corresponding to front and rear sub-optical fibers of the loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points;
in the embodiment of the disclosure, after the loss points of the optical fiber are obtained, the stokes curve values before and after each loss point, that is, the intensity values of the stokes light signals before and after each loss point, are determined according to the obtained stokes curve; and determining anti-stokes curve values before and after each loss point according to the acquired anti-stokes curve, namely the intensity values of the signals of the anti-stokes light before and after each loss point. And calculating according to the acquired curve values, and determining the proportional coefficient corresponding to each loss point. And determining all loss points on the optical fiber to be calibrated according to the Stokes curve and the anti-Stokes curve, and dividing the whole optical fiber to be calibrated into a plurality of sections of sub-optical fibers according to the specific positions of the loss points on the optical fiber. Wherein, the calculated proportionality coefficient of each loss point can be generally regarded as the proportionality coefficient of a section of the sub-optical fiber after the loss point.
And S103, determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature.
In the embodiment of the present disclosure, the proportional coefficient of the loss point and the collected temperature at the loss point are substituted into a linear relation between the measured temperature of the optical fiber and the collected signal, the currently collected signal is used as the collected signal, the collected temperature is used as the measured temperature, and the linear relation constant of the linear relation can be obtained after substitution calculation. And according to the proportional coefficient and the linear relation constant, obtaining the linear relation between the measured temperature and the collected signal of each section of the sub-optical fiber in the optical fiber to be calibrated, and completing calibration.
According to the embodiment of the disclosure, the ratio coefficient value of each section of sub-optical fiber on the optical fiber to be calibrated is determined through the acquired stokes curve and anti-stokes curve of the optical fiber to be calibrated, the ratio coefficient of each loss point is determined according to the ratio coefficient value, and the linear relation between the measured temperature and the acquired signal of each section of sub-optical fiber in the optical fiber to be calibrated is determined according to the ratio coefficient and the acquired temperature of each loss point. According to the embodiment of the calibration method and the calibration device, the linear relation between the temperature and the collected signal can be determined directly through the collected signal and the collected temperature, calibration is completed, the calibration operation flow of the optical fiber temperature sensor is simplified, the workload is saved, and the calibration efficiency is improved.
In one embodiment, the determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-fibers of the loss point includes:
respectively carrying out attenuation compensation processing on the Stokes curve and the anti-Stokes curve to obtain a processed Stokes curve and a processed anti-Stokes curve;
and determining the proportional coefficient corresponding to the loss point according to the processed Stokes curve and the processed anti-Stokes curve.
In the embodiment of the disclosure, the stokes curve and the anti-stokes curve acquired by the signal acquisition instrument are subjected to attenuation compensation processing. The curve after the attenuation compensation processing can be regarded as a Stokes curve and an anti-Stokes curve without attenuation in an ideal state, curve values corresponding to the front and rear sub-optical fibers of the loss point on the processed curve are obtained, and the proportionality coefficient of each loss point is determined according to the obtained curve values. In one example, when performing attenuation compensation, the principle formula of attenuation compensation is:
in the above formula, L is the position of the optical fiber,α 1 to be the attenuation coefficient of the stokes light in the fiber,α 2 to account for the attenuation coefficient of the anti-stokes light in the fiber,
、
for the attenuation compensated stokes and anti-stokes curves,
、
the stokes and anti-stokes curves are collected. When attenuation compensation is performed, the product of the position and the attenuation coefficient in the formula can be adjusted according to the actual scene. And performing attenuation compensation on the Stokes curve and the anti-Stokes curve according to the attenuation compensation principle formula to obtain the Stokes curve and the anti-Stokes curve after the attenuation compensation.
Fig. 3 is a schematic diagram of a collected signal curve of an optical fiber temperature sensor according to an exemplary embodiment, and referring to fig. 3, since a stokes curve and an anti-stokes curve directly obtained by a signal collection instrument have attenuation, intensity values before and after a loss point are both in a reduced state, and at this time, the obtained curve values before and after the loss point have errors of different degrees due to different sampling points.After attenuation compensation is performed on the acquired signal curve, the schematic diagram of the processed acquired signal curve shown in fig. 4 can be obtained, and due to the attenuation compensation, the curve a at a distance before the loss point 1 、B 1 Curve a at a later distance 2 、B 2 The curve values of the front section and the rear section of the loss point are more accurate than the original curve.
According to the embodiment of the disclosure, the original stokes curve and the anti-stokes curve acquired by the instrument are subjected to attenuation compensation processing to obtain the processed stokes curve and anti-stokes curve, and the proportionality coefficient of each loss point is determined according to the curve values corresponding to the optical fibers before and after the loss point on the processed curves. The embodiment of the disclosure can reduce the influence of signal attenuation on the acquired curve value, and calculate the accurate proportionality coefficient through the accurate curve value, thereby improving the accuracy of the final calibrated linear relation.
In one embodiment, the determining a proportionality coefficient corresponding to the loss point according to stokes curve values and anti-stokes curve values corresponding to front and rear sub-fibers of the loss point includes:
obtaining corresponding curve values of the Stokes curve and the front and rear sub-optical fibers of the loss point on the anti-Stokes curve;
determining a first ratio and a second ratio according to the curve values, wherein the first ratio is the ratio of the curve value corresponding to a section of sub-optical fiber after the loss point on the Stokes curve to the curve value corresponding to a section of sub-optical fiber before the loss point on the Stokes curve, and the second ratio is the ratio of the curve value corresponding to a section of sub-optical fiber after the loss point on the anti-Stokes curve to the curve value corresponding to a section of sub-optical fiber before the loss point on the anti-Stokes curve;
and determining a proportional coefficient corresponding to the loss point according to the first ratio and the second ratio.
In the embodiment of the disclosure, after the stokes curve and the anti-stokes curve are obtained, the loss point is determined according to the curves, and curve values corresponding to the front and rear sub-fibers of the loss point are obtained. And determining the ratio of the curve value corresponding to the section of sub-optical fiber after the loss point on the Stokes curve to the curve value corresponding to the previous section of sub-optical fiber as a first ratio, and determining the ratio of the curve value corresponding to the section of sub-optical fiber after the loss point on the anti-Stokes curve to the curve value corresponding to the previous section of sub-optical fiber as a first ratio. Wherein the curve value is the intensity value of the light. And after the first ratio and the second ratio of each loss point are obtained, calculating the proportional coefficient corresponding to each loss point according to the relationship between the first ratio, the second ratio and the proportional coefficient. In one example, an average value of curve values of a preset distance before a loss point may be used as a curve value corresponding to a section of sub-fiber before the loss point, and an average value of curve values of a preset distance after the loss point may be used as a curve value corresponding to a section of sub-fiber after the loss point, where the preset distance is a smaller distance set according to an actual scene, and the intensity value of light in the smaller distance may not change greatly.
In one example, as shown in FIG. 4, a segment of the sub-fiber following the loss point on the anti-Stokes curve corresponds to a curve value A 2 The curve value corresponding to the previous segment of sub-fiber is A 1 (ii) a The curve value corresponding to a section of the sub-optical fiber after the loss point on the Stokes curve is B 2 The curve value corresponding to the previous segment of the sub-fiber is B 1 . Then the first ratio is B 2 /B 1 The second ratio is A 2 /A 1 。
According to the method and the device, the first ratio and the second ratio related to the proportional coefficient of the loss point can be determined according to the acquired stokes curve and the curve values corresponding to the front sub-optical fiber and the rear sub-optical fiber of the loss point on the anti-stokes curve, and the proportional coefficient corresponding to each loss point is determined according to the acquired first ratio and the acquired second ratio. According to the embodiment of the disclosure, the first ratio and the second ratio can be calculated by extracting an effective curve value from the obtained curve, so that the proportionality coefficient of each loss point can be obtained, and the proportionality coefficient is provided for determining the linear relation between the measurement temperature and the acquired signal.
In one embodiment, the determining the scaling factor corresponding to the loss point according to the first ratio and the second ratio includes:
respectively obtaining first ratio coefficients corresponding to other loss points from the initial position of the optical fiber to be calibrated to the loss point and first ratio coefficients corresponding to the loss points, wherein the first ratio coefficients are the ratio of the first ratio and the second ratio corresponding to the loss points;
and determining a second proportional coefficient of the loss point as a product of the first proportional coefficient corresponding to the loss point and the first proportional coefficients corresponding to the other loss points, and taking the second proportional coefficient as the proportional coefficient corresponding to the loss point.
In the embodiment of the present disclosure, after the first ratio and the second ratio of each loss point are obtained, the ratio of the first ratio and the second ratio of each loss point is used as the first proportion coefficient corresponding to each loss point. When determining the proportionality coefficient of a loss point, first proportionality coefficients of all other loss points from an initial position of an optical fiber to be calibrated to the loss point and first proportionality coefficients corresponding to the loss point are obtained, and the first proportionality coefficients of all the other loss points and the first proportionality coefficients corresponding to the loss point are multiplied to obtain a second proportionality coefficient, wherein the second proportionality coefficient is the proportionality coefficient of the loss point. The proportional coefficients corresponding to all the loss points on the optical fiber to be calibrated can be determined by calculation according to the method.
In one example, as shown in fig. 4, the first scaling factor corresponding to the loss point is
。
According to the embodiment of the disclosure, after the first ratio and the second ratio corresponding to each loss point are obtained, the first ratio coefficient corresponding to each loss point is obtained through calculation according to the first ratio and the second ratio, and the ratio coefficient corresponding to each loss point on the optical fiber to be calibrated is determined according to the first ratio coefficient. According to the embodiment of the disclosure, the first proportional coefficient of each loss point can be determined through the first ratio and the second ratio, and then the proportional coefficient of each loss point is determined according to the first proportional coefficient of each loss point, so that the proportional coefficient of each loss point can be obtained, and the proportional coefficient is provided for determining the linear relation between the measured temperature and the acquired signal.
In one embodiment, the determining a linear relationship between the measured temperature of each section of the sub-optical fiber and the collected signal of the sub-optical fiber according to the scaling factor and the temperature includes:
acquiring the ratio of the anti-Stokes light signal value to the Stokes light signal value of the reference optical fiber;
acquiring a reference temperature at a preset position of the reference optical fiber and a normal temperature coefficient of the reference optical fiber;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature.
In the embodiment of the disclosure, when the optical fiber temperature sensor is calibrated, a reference optical fiber is further provided. After determining the proportional coefficients corresponding to the loss points and the temperatures corresponding to each loss point, the data of the reference optical fiber is also needed when the linear relationship is calibrated. The method comprises the steps of obtaining the ratio of an anti-Stokes light signal value to a Stokes light signal value of a reference optical fiber, and then obtaining the reference temperature of a preset position of the reference optical fiber and the normal temperature coefficient of the reference optical fiber. According to the ratio, the reference temperature, the normal temperature coefficient, the determined proportionality coefficient and the temperature of each section of sub-optical fiber, and by combining a principle formula, the linear relation between the measured temperature of each section of sub-optical fiber and the collected signal can be obtained.
In one example, the constant of the linear relationship between the measured temperature and the collected signal of the sub-optical fiber after the loss point is shown in fig. 4
。
According to the embodiment of the disclosure, each parameter value of the reference optical fiber can be obtained, and the linear relation between the measured temperature of each section of sub-optical fiber and the collected signal is determined according to the proportional coefficient corresponding to each loss point and the temperature of each loss point.
In one embodiment, the determining a linear relationship between the measured temperature of the sub optical fiber and the collected signal of the sub optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature includes:
under the condition that the sub optical fiber is the first section of the starting end of the optical fiber to be calibrated, determining the proportionality coefficient of the sub optical fiber as a fixed value;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In the embodiment of the present disclosure, when determining the linear relationship between the measured temperature of the sub-optical fibers and the collected signal, it is necessary to determine the scaling factor corresponding to each section of sub-optical fiber. In the case that the sub-fiber is the first segment of the starting end of the sub-fiber to be calibrated, the proportionality coefficient of the segment of the sub-fiber is a fixed value, usually a fixed value of 1. And determining a linear relation constant of the linear relation between the measured temperature of the section of sub-optical fiber and the acquired signal according to the ratio, the reference temperature, the normal temperature coefficient, the fixed value and the temperature of each loss point and by combining a principle formula. And directly determining the linear relation between the measured temperature of the sub-optical fiber and the collected signal according to the linear relation constant and the fixed value.
According to the embodiment of the disclosure, the proportionality coefficient of the first section of the sub-optical fiber from the initial position of the optical fiber to be calibrated can be determined, and the linear relation between the measured temperature of the sub-optical fiber and the collected signal is determined by combining the obtained other parameters according to the proportionality coefficient. The embodiment of the disclosure can determine the linear relation between the temperature of the sub-optical fiber and the measurement signal under the condition that the sub-optical fiber is the first section of the optical fiber to be calibrated.
In one embodiment, the determining a linear relationship between the measured temperature of the sub optical fiber and the collected signal of the sub optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature includes:
under the condition that the sub optical fiber is not the first section of the starting end of the optical fiber to be calibrated, determining a proportional coefficient of the sub optical fiber corresponding to a loss point of the sub optical fiber close to the starting end of the optical fiber to be calibrated as the proportional coefficient of the sub optical fiber;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient of the sub-optical fiber and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
In the embodiment of the present disclosure, when determining the linear relationship between the measured temperature of the sub-optical fibers and the collected signal, it is necessary to determine the scaling factor corresponding to each section of sub-optical fiber. Under the condition that the sub-optical fiber is not the first section of the starting end of the sub-optical fiber to be calibrated, the proportionality coefficient of the section of the sub-optical fiber is in a correlation relation with the proportionality coefficient of the loss point, and the proportionality coefficient of the sub-optical fiber corresponding to the loss point close to the starting end of the optical fiber is usually the proportionality coefficient of the sub-optical fiber, that is, the proportionality coefficient of each loss point can be regarded as the proportionality coefficient of a section of the sub-optical fiber after the loss point. And determining a linear relation constant of the linear relation between the measured temperature of the section of sub-optical fiber and the acquired signal according to the ratio, the reference temperature, the normal temperature coefficient, the ratio coefficient and the temperature of each section of sub-optical fiber by combining a principle formula. And directly determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal according to the linear relation constant and the proportionality coefficient.
According to the embodiment of the disclosure, the proportionality coefficient from the second section of the sub-optical fiber to the last section of the sub-optical fiber from the initial position of the optical fiber to be calibrated can be determined, and the linear relation between the measured temperature of the sub-optical fiber and the collected signal is determined by combining the obtained other parameters according to the proportionality coefficient. The embodiment of the disclosure can determine the linear relation between the temperature of the sub-optical fiber and the measurement signal under the condition that the sub-optical fiber is not the first section of the optical fiber to be calibrated.
Fig. 5 is a schematic flowchart of a method for calibrating an optical fiber temperature sensor according to an exemplary embodiment, and referring to fig. 5, an OTDR curve of an optical fiber to be calibrated is first obtained by a signal acquisition device, and then attenuation compensation is performed on the OTDR curve to obtain the OTDR curve after the attenuation compensation. And determining a proportionality coefficient, namely m, according to curve values before and after the loss point on the OTDR curve after attenuation compensation. And then combining the obtained temperature corresponding to the section of the optical fiber, and calculating by a principle formula to obtain a linear relation constant, namely b 2 . And calibrating the whole optical fiber to be calibrated according to the method, and finishing the process after all the optical fibers are calibrated. Where an OTDR curve refers to a curve of an optical fiber where the intensity of the returned light is related to the length of the fiber.
It should be understood that, although the steps of the flowcharts in the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in the figures may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or at least partially in sequence with other steps or other steps.
Based on the same inventive concept, the embodiment of the present disclosure further provides a device for calibrating an optical fiber temperature sensor, which is used for implementing the above-mentioned method for calibrating an optical fiber temperature sensor. The implementation scheme for solving the problem provided by the apparatus is similar to the implementation scheme described in the above method, so specific limitations in the apparatus embodiments for calibrating one or more optical fiber temperature sensors provided below can refer to the limitations in the above method for calibrating optical fiber temperature sensors, and are not described herein again.
In one embodiment, as shown in FIG. 6, an apparatus for fiber optic temperature sensor calibration is provided. The device comprises:
an obtaining module 601, configured to obtain a stokes curve and an anti-stokes curve of an acquisition signal of an optical fiber to be calibrated, and temperatures at multiple loss points of the optical fiber to be calibrated;
a coefficient determining module 602, configured to determine a proportionality coefficient corresponding to the loss point according to a stokes curve value and an anti-stokes curve value corresponding to a front sub-fiber and a rear sub-fiber of the loss point, where the sub-fibers are obtained by segmenting the optical fiber to be calibrated according to the multiple loss points;
and a relation determining module 603, configured to determine a linear relation between the measured temperature of each section of the sub optical fiber in the sub optical fiber and the collected signal of the sub optical fiber according to the scaling factor and the temperature.
All or part of each module in the device for calibrating the optical fiber temperature sensor can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the collected data in the calibration process. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of calibration of an optical fiber temperature sensor.
It will be appreciated by those skilled in the art that the configuration shown in fig. 7 is a block diagram of only a portion of the configuration associated with the embodiments of the present disclosure, and does not constitute a limitation on the computing devices to which the embodiments of the present disclosure may be applied, and that a particular computing device may include more or less components than those shown in the drawings, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) related to the embodiments of the present disclosure are information and data authorized by the user or sufficiently authorized by each party.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, databases, or other media used in the embodiments provided by the embodiments of the disclosure may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example. The databases involved in the various embodiments provided by the embodiments of the present disclosure may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided in the disclosure may be general processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., without being limited thereto.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express a few implementations of the embodiments of the present disclosure, and the descriptions thereof are specific and detailed, but not construed as limiting the scope of the claims of the embodiments of the present disclosure. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present disclosure, and these are all within the scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be subject to the appended claims.
Claims (9)
1. A method for calibrating an optical fiber temperature sensor, the method comprising:
acquiring a Stokes curve and an anti-Stokes curve of a signal acquired by an optical fiber to be calibrated and temperatures of a plurality of loss points of the optical fiber to be calibrated;
determining a proportionality coefficient corresponding to a first loss point according to Stokes curve values and anti-Stokes curve values corresponding to front and rear sub-optical fibers of the first loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points;
the determining the proportionality coefficient corresponding to the first loss point according to the stokes curve values and anti-stokes curve values corresponding to the front and rear sub-fibers of the first loss point comprises:
obtaining corresponding curve values of the Stokes curve and the sub-optical fibers before and after the first loss point on the anti-Stokes curve;
determining a first ratio and a second ratio according to the curve values, wherein the first ratio is the ratio of the curve value corresponding to a section of sub-optical fiber behind the first loss point on the Stokes curve to the curve value corresponding to a section of sub-optical fiber in the previous section, and the second ratio is the ratio of the curve value corresponding to a section of sub-optical fiber behind the first loss point on the anti-Stokes curve to the curve value corresponding to a section of sub-optical fiber in the previous section;
respectively obtaining a first ratio coefficient corresponding to a second loss point between the initial position of the optical fiber to be calibrated and the position of the first loss point and a first ratio coefficient corresponding to the first loss point, wherein the first ratio coefficient is the ratio of a first ratio and a second ratio corresponding to the first loss point;
determining a second proportionality coefficient of the first loss point as a product of a first proportionality coefficient corresponding to the first loss point and a first proportionality coefficient corresponding to the second loss point, and taking the second proportionality coefficient as the proportionality coefficient corresponding to the first loss point;
and determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature.
2. The method according to claim 1, wherein the determining the proportionality coefficient corresponding to the first loss point according to the stokes curve values and anti-stokes curve values corresponding to the front and rear sub-fibers of the first loss point comprises:
respectively carrying out attenuation compensation processing on the Stokes curve and the anti-Stokes curve to obtain a processed Stokes curve and a processed anti-Stokes curve;
and determining a proportionality coefficient corresponding to the first loss point according to the processed Stokes curve and the processed anti-Stokes curve.
3. The method of claim 1, wherein determining the linear relationship between the measured temperature of each of the sub-fibers and the collected signal of the sub-fiber according to the scaling factor and the temperature comprises:
acquiring the ratio of the anti-Stokes light signal value to the Stokes light signal value of the reference optical fiber;
acquiring a reference temperature at a preset position of the reference optical fiber and a normal temperature coefficient of the reference optical fiber;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature.
4. The method according to claim 3, wherein the determining a linear relationship between the measured temperature of the sub-optical fiber and the collected signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient, and the temperature comprises:
under the condition that the sub optical fiber is the first section of the starting end of the optical fiber to be calibrated, determining the proportionality coefficient of the sub optical fiber as a fixed value;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
5. The method of claim 3, wherein the determining the linear relationship between the measured temperature of the sub-fiber and the collected signal of the sub-fiber according to the ratio, the reference temperature, the normal temperature coefficient, the scaling coefficient and the temperature comprises:
under the condition that the sub optical fiber is not the first section of the starting end of the optical fiber to be calibrated, determining a proportional coefficient of the sub optical fiber corresponding to a loss point of the sub optical fiber close to the starting end of the optical fiber to be calibrated as the proportional coefficient of the sub optical fiber;
determining a linear relation constant between the measured temperature of the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the ratio, the reference temperature, the normal temperature coefficient, the proportionality coefficient of the sub-optical fiber and the temperature;
and determining the linear relation between the measured temperature of the sub-optical fiber and the acquired signal of the sub-optical fiber according to the proportionality coefficient and the linear relation constant.
6. An apparatus for calibrating an optical fiber temperature sensor, the apparatus comprising:
the system comprises a first acquisition module, a second acquisition module and a calibration module, wherein the first acquisition module is used for acquiring a Stokes curve and an anti-Stokes curve of an acquisition signal of an optical fiber to be calibrated and temperatures of a plurality of loss points of the optical fiber to be calibrated;
the coefficient determining module is used for determining a proportional coefficient corresponding to a first loss point according to Stokes curve values and anti-Stokes curve values corresponding to front and rear sub-optical fibers of the first loss point, wherein the sub-optical fibers are obtained by segmenting the optical fiber to be calibrated according to the plurality of loss points;
the coefficient determination module includes:
the second acquisition module is used for acquiring the Stokes curve and curve values corresponding to the front and rear sub-optical fibers of the first loss point on the anti-Stokes curve;
a first determining module, configured to determine a first ratio and a second ratio according to the curve value, where the first ratio is a ratio of a curve value corresponding to a section of sub-fiber after a first loss point on the stokes curve to a curve value corresponding to a section of sub-fiber before the first loss point, and the second ratio is a ratio of a curve value corresponding to a section of sub-fiber after the first loss point on the anti-stokes curve to a curve value corresponding to a section of sub-fiber before the first loss point;
a third obtaining module, configured to obtain a first ratio coefficient corresponding to a second loss point between the starting position of the optical fiber to be calibrated and the position of the first loss point, and a first ratio coefficient corresponding to the first loss point, where the first ratio coefficient is a ratio of a first ratio and a second ratio corresponding to the first loss point;
the determining submodule is used for determining that a second proportional coefficient of the first loss point is a product of a first proportional coefficient corresponding to the first loss point and a first proportional coefficient corresponding to the second loss point, and the second proportional coefficient is used as the proportional coefficient corresponding to the first loss point;
and the relation determining module is used for determining the linear relation between the measured temperature of each section of the sub-optical fiber in the sub-optical fiber and the acquisition signal of the sub-optical fiber according to the proportionality coefficient and the temperature.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, performs the steps of the method of fiber optic temperature sensor calibration according to any of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for calibration of an optical fiber temperature sensor according to any one of claims 1 to 5.
9. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, carries out the steps of the method for fiber optic temperature sensor calibration according to any one of claims 1 to 5.
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