CN113008310A - Rayleigh-Raman fusion type distributed optical fiber sensing system and data processing method - Google Patents
Rayleigh-Raman fusion type distributed optical fiber sensing system and data processing method Download PDFInfo
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- CN113008310A CN113008310A CN202110361532.8A CN202110361532A CN113008310A CN 113008310 A CN113008310 A CN 113008310A CN 202110361532 A CN202110361532 A CN 202110361532A CN 113008310 A CN113008310 A CN 113008310A
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35361—Sensor working in reflection using backscattering to detect the measured quantity using elastic backscattering to detect the measured quantity, e.g. using Rayleigh backscattering
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
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Abstract
本发明公开了一种瑞利‑拉曼融合型分布式光纤传感系统和数据处理方法，利用窄线宽激光器作为光源，开关型半导体光放大器进行脉冲调制，利用采样率的相同的光电转换和采集卡同时接收后向瑞利信号和后向拉曼信号，利用变时延脉冲对进行探测，对后向瑞利散射光平移对齐后进行后续处理，而后向拉曼散射光通过交叉重组、平滑降噪及解卷积计算后达到采样率的提升，最后再通过脉冲对的温度曲线重建温度场，实现融合系统温度测量空间分辨率的提升，硬件高度融合的，主要技术指标不受影响，可实现普通单模光纤分布式振动温度同时监测。
The invention discloses a Rayleigh-Raman fusion distributed optical fiber sensing system and a data processing method. A narrow linewidth laser is used as a light source, a switch-type semiconductor optical amplifier is used for pulse modulation, and the same photoelectric conversion and The acquisition card receives the backward Rayleigh signal and the backward Raman signal at the same time, uses the variable delay pulse pair for detection, and performs subsequent processing after shifting and aligning the backward Rayleigh scattered light. After noise reduction and deconvolution calculation, the sampling rate can be improved. Finally, the temperature field is reconstructed through the temperature curve of the pulse pair to improve the spatial resolution of the temperature measurement of the fusion system. The hardware is highly integrated, and the main technical indicators are not affected. Realize the simultaneous monitoring of distributed vibration and temperature of ordinary single-mode fiber.
Description
Technical Field
The invention relates to the technical field of distributed optical fiber sensing, in particular to a Rayleigh-Raman fusion type distributed optical fiber sensing system and a data processing method.
Background
The distributed optical fiber sensing technology is particularly suitable for safety monitoring of buried pipelines such as oil, gas, water, electricity, networks and the like due to the characteristics of continuous multi-point detection, long monitoring distance, simplicity and convenience in installation and the like, at present, a phase-sensitive optical time domain reflectometer is generally utilized to detect vibration signals along the line of an optical cable laid along the buried pipeline, accurate positioning and early warning are carried out on events such as mechanical construction, artificial damage and the like near the pipeline, and possible leakage accidents are prevented from sprouting in time.
When an actual accident happens, a plurality of physical parameters are always changed at the same time, so that the detection of a single physical quantity is difficult to accurately early warn or position an event, and the simultaneous monitoring of distributed vibration temperature is very significant. The existing method of the fusion system is realized by using a multi-core optical fiber, or the technical index of the fusion system is seriously degraded, and the distributed vibration temperature of the common single-mode optical fiber cannot be simultaneously monitored.
Disclosure of Invention
The invention aims to provide a Rayleigh-Raman fusion type distributed optical fiber sensing system and a data processing method, which are used for realizing the simultaneous monitoring of distributed vibration temperature of a common single-mode optical fiber.
In order to achieve the above object, in a first aspect, the present invention provides a rayleigh-raman fusion type distributed optical fiber sensing system, which includes a narrow linewidth laser, a switch-type semiconductor optical amplifier, an erbium-doped optical fiber amplifier, an optical fiber circulator, a wavelength division multiplexer, a calibration component, a sensing optical cable, a multi-stage amplification circuit, a multi-channel acquisition card, and an industrial personal computer, wherein the narrow linewidth laser, the switch-type semiconductor optical amplifier, the erbium-doped optical fiber amplifier, the optical fiber circulator, the wavelength division multiplexer, the calibration component, and the sensing optical cable are sequentially connected, the multi-stage amplification circuit is connected to the optical fiber circulator and the wavelength division multiplexer, and the multi-stage amplification circuit, the multi-channel acquisition card, and the industrial personal computer are sequentially connected.
The Rayleigh-Raman fusion type distributed optical fiber sensing system further comprises a pulse width and time delay control module, and the pulse width and time delay control module is connected with the switch type semiconductor optical amplifier and the multichannel acquisition card respectively.
The calibration assembly comprises a calibration optical fiber and a thermistor, the calibration optical fiber is connected with the wavelength division multiplexer and the sensing optical cable, and the thermistor is connected with the industrial personal computer.
The optical fiber circulator is provided with a first port, a second port and a third port, the first port is connected with the erbium-doped optical fiber amplifier, the second port is connected with the wavelength division multiplexer, and the third port is connected with the multistage amplification circuit.
Wherein the wavelength division multiplexer has a fourth port and a fifth port, both of which are connected to the multi-stage amplification circuit.
In a second aspect, the present invention provides a data processing method for a rayleigh-raman fusion type distributed optical fiber sensing system, which is suitable for the rayleigh-raman fusion type distributed optical fiber sensing system according to the first aspect, and includes the following steps:
the switching type semiconductor optical amplifier is driven by the pulse width and time delay control module to generate pulse pairs with different time delays, and the pulse pairs enter the sensing optical cable to generate backward Rayleigh scattering light and backward Raman scattering light after the emission of a plurality of groups of pulse pairs is finished;
after the backward Rayleigh scattered light is obtained, corresponding time delay translation alignment is carried out on each group of pulse pairs, noise reduction processing is carried out on the obtained two groups of original data curves, then disturbance waveform superposition is carried out, and warning is carried out by utilizing the combined disturbance waveform;
after the backward Raman scattering light is obtained, carrying out cross recombination, smooth noise reduction and deconvolution calculation on a plurality of groups of backward Raman scattering light, and reconstructing a temperature curve obtained by temperature demodulation by using pulse width.
The invention relates to a Rayleigh-Raman fusion type distributed optical fiber sensing system and a data processing method, wherein a narrow linewidth laser is used as a light source, a switch type semiconductor optical amplifier is used for pulse modulation, the backward Rayleigh signal and the backward Raman signal are simultaneously received by using the same photoelectric conversion and acquisition card of the sampling rate, the backward Rayleigh scattering light is detected by using a time-varying delay pulse pair, the backward Rayleigh scattering light is subjected to subsequent processing after being translated and aligned, then the sampling rate is increased after the backward Raman scattering light is subjected to cross recombination, smooth noise reduction and deconvolution calculation, and finally a temperature field is reconstructed by using a temperature curve of the pulse pair, so that the temperature measurement spatial resolution of the fusion system is increased, the hardware is highly fused, the main technical index is not influenced, and the distributed vibration temperature of the common.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rayleigh-raman fusion type distributed optical fiber sensing system provided by the present invention.
Fig. 2 is a schematic diagram of a variable delay pulse pair sampling provided by the present invention.
Fig. 3 is a schematic diagram of the processing of the backward rayleigh scattering data provided by the present invention.
Fig. 4 is a schematic diagram of the processing of the backward raman scattering data provided by the present invention.
Fig. 5 is a schematic step diagram of a data processing method of a rayleigh-raman fusion type distributed optical fiber sensing system provided by the present invention.
The system comprises a 1-narrow linewidth laser, a 2-switch type semiconductor optical amplifier, a 3-erbium-doped optical fiber amplifier, a 4-optical fiber circulator, a 5-wavelength division multiplexer, a 6-calibration optical fiber, a 7-thermistor, an 8-sensing optical cable, a 9-multi-stage amplification circuit, a 10-multi-channel acquisition card, an 11-pulse width and time delay control module, a 12-industrial personal computer, a 41-first port, a 42-second port, a 43-third port, a 51-fourth port and a 52-fifth port.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, the present invention provides a rayleigh-raman fusion type distributed optical fiber sensing system, the Rayleigh-Raman fusion type distributed optical fiber sensing system comprises a narrow linewidth laser 1, a switch type semiconductor optical amplifier 2, an erbium-doped optical fiber amplifier 3, an optical fiber circulator 4, a wavelength division multiplexer 5, a calibration component, a sensing optical cable 8, a multi-stage amplification circuit 9, a multi-channel acquisition card 10 and an industrial personal computer 12, the narrow linewidth laser 1, the switch type semiconductor optical amplifier 2, the erbium-doped optical fiber amplifier 3, the optical fiber circulator 4, the wavelength division multiplexer 5, the calibration assembly and the sensing optical cable 8 are connected in sequence, the multistage amplifying circuit 9 is connected with the optical fiber circulator 4 and the wavelength division multiplexer 5, and the multistage amplifying circuit 9, the multi-channel acquisition card 10 and the industrial personal computer 12 are sequentially connected.
In this embodiment, the sampling rates of the multi-channel APD, the multi-stage amplifier circuit 9 and the multi-channel acquisition card 10 are both 40 MHz; the switch type semiconductor optical amplifier 2 receives an emitted electric pulse signal, continuous light emitted by the narrow-linewidth laser 1 is modulated into a laser pulse signal with a corresponding width, the laser pulse signal is amplified by the erbium-doped optical fiber amplifier 3, and then enters the sensing optical cable 8 after passing through the optical fiber circulator 4, the 1450nm/1550nm/1660nm wavelength division multiplexer 5 and the calibration assembly, the backward rayleigh scattered light and the backward raman scattered light are generated by interaction with the sensing optical cable 8 along with forward transmission of the light pulse in the optical cable, the backward scattered light returns as the original path and is filtered by the 1450/1550/1660 wavelength division multiplexer 5, the backward rayleigh scattered light is emitted through a third port of the optical fiber circulator 4, the backward raman scattered light is emitted from two ports of the 1450/1550/1660 wavelength division multiplexer 5 respectively, and the three paths of photosensitive signals are subjected to photoelectric conversion and multistage amplification through the multichannel APD and the multistage amplification circuit 9, and the data is transmitted to an acquisition card for analog-to-digital conversion and data acquisition, and finally the data is transmitted to the industrial personal computer 12 for data processing.
The sampling rates of the multichannel APD and the multi-stage amplifying circuit 9 and the multichannel acquisition card 10 are both 40MHz, the switch type semiconductor optical amplifier 2 is driven by the pulse width and time delay control module 11 to generate pulse pairs for different tests, the pulse widths of the pulse pairs are respectively 100ns and 105ns, on the basis of the first group of pulse pairs, the last four groups of pulse pairs are sequentially delayed for 25ns to perform pulse triggering, the fifth group of pulse pairs circulate from the first group after being transmitted, and under the condition that the sampling start time is not changed, time delay sampling is equivalently performed.
Further, the rayleigh-raman fusion type distributed optical fiber sensing system further includes a pulse width and time delay control module 11, and the pulse width and time delay control module 11 is respectively connected with the switch type semiconductor optical amplifier 2 and the multi-channel acquisition card 10.
In the present embodiment, the pulse width and delay control module 11 sends an electrical pulse signal to the switching semiconductor optical amplifier 2, and modulates the continuous light sent from the narrow linewidth laser 1 into a laser pulse signal of a corresponding width.
Further, the calibration assembly comprises a calibration optical fiber 6 and a thermistor 7, the calibration optical fiber 6 is connected with the wavelength division multiplexer 5 and the sensing optical cable 8, and the thermistor 7 is connected with the industrial personal computer 12.
In the present embodiment, the calibration optical fiber 6 and the thermistor 7 are used for real-time calibration at the time of temperature demodulation of the raman optical time domain reflectometer.
Further, the optical fiber circulator 4 has a first port 41, a second port 42, and a third port 43, the first port 41 is connected to the erbium-doped fiber amplifier 3, the second port 42 is connected to the wavelength division multiplexer 5, and the third port 43 is connected to the multistage amplification circuit 9.
In the present embodiment, the first port 41 receives the signal amplified by the erbium-doped fiber amplifier 3, the second port 42 transmits the signal passing through the fiber circulator 4 to the calibration fiber 6, and the third port 43 emits the backward rayleigh scattered light to the multistage amplifier circuit 9.
Further, the wavelength division multiplexer 5 has a fourth port 51 and a fifth port 52, and both the fourth port 51 and the fifth port 52 are connected to the multistage amplification circuit 9.
In this embodiment, the fourth port 51 is a 1660 port, and the fifth port 52 is a 1450 port, and mainly functions to emit backward raman scattered light to the multistage amplifier circuit 9.
Referring to fig. 5, the present invention provides a data processing method for a rayleigh-raman fusion type distributed optical fiber sensing system, which is suitable for the rayleigh-raman fusion type distributed optical fiber sensing system, and includes the following steps:
and S101, driving the switch type semiconductor optical amplifier 2 to generate pulse pairs with different time delays through the pulse width and time delay control module 11 until a plurality of groups of pulse pairs are transmitted, and enabling the pulse pairs to enter the sensing optical cable 8 to generate backward Rayleigh scattering light and backward Raman scattering light.
Specifically, the sampling rates of the multi-channel APD and multi-stage amplification circuit 9 and the multi-channel acquisition card 10 are the same, the pulse width and time delay control module 11 drives the switch type semiconductor optical amplifier 2 to generate pulse pairs with different time delays, the pulse widths of the pulse pairs are respectively T and T + delta T, on the basis of the first group of pulse pairs, the following pulse pairs are subjected to pulse triggering after being delayed by delta T in sequence, delta T is an integral multiple of the sampling rate of the acquisition card, and after the N group of pulse pairs are transmitted, the cycle is started from the first group and the sampling time is unchanged, which is equivalent to time delay sampling. As shown in fig. 2, the pulse widths of the pulse pairs are 100ns and 105ns, on the basis of the first group of pulse pairs, the latter four groups of pulse pairs are sequentially delayed by 25ns for pulse triggering, the fifth group of pulse pairs starts to circulate from the first group after being transmitted, and when the sampling start time is not changed, the time delay sampling is performed.
And S102, after the backward Rayleigh scattered light is obtained, corresponding time delay translation alignment is carried out on each group of pulse pairs, noise reduction processing is carried out on the two groups of obtained original data curves, then disturbance waveform superposition is carried out, and warning is carried out by utilizing the combined disturbance waveform.
Specifically, after the backward rayleigh scattered light is obtained, each group of pulse pairs is subjected to corresponding time delay translation alignment, as shown in fig. 3, two groups of phi-OTDR original data curves corresponding to different pulse width translations are obtained, first, the original signals of the two groups of pulse widths are subjected to moving average noise reduction processing, then, an average algorithm is performed to continue noise reduction and reduce the data processing amount, and then, a difference algorithm is used to calculate a disturbance curve and wavelet decomposition is used to perform noise reduction processing. Because the change of the tiny pulse width can not influence the change of the vibration position, the disturbance waveforms obtained by two different pulse widths can be superposed, finally the combined disturbance waveforms are used for alarming, and the vibration signal matrix near the corresponding position is intercepted, and the type of the event generating the disturbance is judged by machine learning.
S103, after the backward Raman scattering light is obtained, carrying out cross recombination, smooth noise reduction and deconvolution calculation on a plurality of groups of backward Raman scattering light, and reconstructing a temperature curve obtained through temperature demodulation by using pulse width.
Specifically, after the backward raman scattering light is obtained, due to the fact that the time delay of N groups of pulse pairs is sequentially increased by delta T, a group of data of N times of photoelectric conversion and sampling rate of the acquisition card can be obtained through cross recombination, smooth noise reduction and deconvolution calculation of the N groups of backward raman scattering light, and then stokes raman scattering signals and anti-stokes raman scattering signals of which T and T + delta T pulse widths correspond to the N times of sampling rate are obtained. Temperature curves corresponding to the T and T + delta T pulse widths are obtained through temperature demodulation, and finally the temperature curves corresponding to the T and T + delta T pulse widths are used for reconstructing the temperature curves of the delta T pulse widths, so that the spatial resolution of temperature measurement in the fusion system is improved.
As shown in fig. 4, since the time delays of five groups of pulse pairs are sequentially increased by 25ns, the interval of one sampling point with the sampling rate of exactly 40MHz corresponds to the time delay of five groups of pulse pairs, a group of 200MHz sampled data can be obtained by using five groups of 40MHz sampled data with exactly one sampling point delayed in time, and five groups of 40MHz backward raman signal cross recombination, smooth noise reduction and deconvolution calculation, so that the stokes raman scattering signals and anti-stokes raman scattering signals with 100ns and 105ns pulse widths corresponding to 200MHz samples can be calculated. Temperature curves corresponding to the pulse widths of 100ns and 105ns are obtained through temperature demodulation, and finally the temperature curves corresponding to the pulse widths of 100ns and 105ns are used for reconstructing a temperature curve with the pulse width of 5ns, so that the temperature measurement spatial resolution of the fusion system reaches 0.5 m.
The invention relates to a Rayleigh-Raman fusion type distributed optical fiber sensing system and a data processing method, wherein a narrow linewidth laser is used as a light source, a switch type semiconductor optical amplifier is used for pulse modulation, the backward Rayleigh signal and the backward Raman signal are simultaneously received by using the same photoelectric conversion and acquisition card of the sampling rate, the backward Rayleigh scattering light is detected by using a time-varying delay pulse pair, the backward Rayleigh scattering light is subjected to subsequent processing after being translated and aligned, then the sampling rate is increased after the backward Raman scattering light is subjected to cross recombination, smooth noise reduction and deconvolution calculation, and finally a temperature field is reconstructed by using a temperature curve of the pulse pair, so that the temperature measurement spatial resolution of the fusion system is increased, the hardware is highly fused, the main technical index is not influenced, and the distributed vibration temperature of the common.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
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| CN114925722A (en) * | 2022-05-06 | 2022-08-19 | 广西师范大学 | Perimeter security intrusion signal detection method based on generalized S transformation and transfer learning |
| CN115014572A (en) * | 2022-06-07 | 2022-09-06 | 四川大学 | Method for improving performance of temperature sensing array by using optical fiber Rayleigh scattering |
| CN115615332A (en) * | 2022-10-19 | 2023-01-17 | 广东电网有限责任公司 | A state online monitoring system of optical fiber composite overhead ground wire |
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