CN115682948A - Urban rail monitoring method and system based on distributed optical fiber - Google Patents
Urban rail monitoring method and system based on distributed optical fiber Download PDFInfo
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Abstract
The application discloses a distributed optical fiber-based urban rail monitoring method and system, which comprises the following steps: emitting probe light to one end of the sensing optical fiber and emitting pump light to the other end of the sensing optical fiber; receiving a backward Brillouin scattering signal returned by the induction optical fiber; obtaining a Brillouin frequency spectrum from the backward Brillouin scattering signal and the detection light frequency; obtaining strain of the induction optical fiber by the Brillouin frequency spectrum, and further obtaining the track displacement; judging whether the track displacement exceeds a preset threshold value or not; if not, judging the track to be in a healthy state; if the track state exceeds the preset threshold value, judging the track is in an unhealthy state, and sending an alarm signal; the system adopts the method. The method and the device have the advantages of real-time monitoring, multiple measurement points, long measurement distance, intrinsic safety and no electromagnetic interference, realize higher-precision measurement, process and analyze data, record and store data and provide decision and analysis basis.
Description
Technical Field
The present disclosure relates generally to the field of rail detection, and more particularly, to a method and system for monitoring urban rails based on distributed optical fibers.
Background
In the field of urban rail transit, the key operation and maintenance objects are trains and rails. The occurrence of a rail accident will have serious consequences. The walking rail is broken at low temperature in winter due to the problem of equipment installation process, so that the rail is broken and large rail gaps are formed; these problems all bring great danger to train running. At present, the urban rail transit industry generally adopts a manual inspection mode, and discrete point measurement is carried out in a mode of combining visual inspection, a steel plate ruler and a feeler gauge, so that the method has the defects of large measurement data interval, large human error and dependence on the detection habit and experience of a measurer, and cannot form an effective data analysis basis.
In view of this, it is urgently needed to research and provide a safe, efficient and accurate urban rail monitoring method and system, so as to ensure safety and reliability of trains, improve efficiency and save energy, realize intelligent operation and maintenance management of urban rails, and meet actual requirements of urban rail transit operation and maintenance in China.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a distributed optical fiber-based urban rail monitoring method and system.
In a first aspect, a distributed optical fiber-based urban rail monitoring method is provided, which includes the following steps:
emitting probe light to one end of the sensing optical fiber and emitting pump light to the other end of the sensing optical fiber;
receiving a backward Brillouin scattering signal returned by the induction optical fiber;
obtaining a Brillouin frequency spectrum from the backward Brillouin scattering signal and the detection light frequency;
obtaining strain of the induction optical fiber by the Brillouin frequency spectrum, and further obtaining the track displacement;
judging whether the track displacement exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
According to the technical scheme provided by the embodiment of the application, the backward Brillouin scattering signal returned by the induction optical fiber is received, and meanwhile, the Raman scattering signal returned by the induction optical fiber is also received;
obtaining a Raman spectrum from the Raman scattering signal;
obtaining temperature strain of the sensing optical fiber by Raman spectrum, and further obtaining track temperature;
judging whether the track temperature exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
According to the technical scheme provided by the embodiment of the application, before receiving the backward Brillouin scattering signal and the Raman scattering signal returned by the induction optical fiber, the noise reduction processing is carried out on the received signal.
According to the technical scheme provided by the embodiment of the application, the backward Brillouin scattering signal is received uninterruptedly, the frequency difference between the pumping light and the detection light is continuously scanned and received uninterruptedly, the Brillouin frequency spectrums of different positions of the sensing optical fiber are obtained, and further the strain capacity of the whole sensing optical fiber is obtained.
According to the technical scheme provided by the embodiment of the application, the Raman scattering signals are continuously received, the receiving time is recorded, the position of the temperature strain of the sensing optical fiber is obtained, and the temperature strain of the whole sensing optical fiber is further obtained.
In a second aspect, there is provided a system using the distributed optical fiber-based urban rail monitoring method described above, including:
the induction optical fiber is laid on the urban rail walking rail;
the detection module is provided with a first laser unit and a second laser unit, and the first laser unit is connected with one end of the sensing optical fiber and used for emitting detection light to the sensing optical fiber; the second laser unit is connected with the other end of the sensing optical fiber and used for emitting pump light to the sensing optical fiber; the detection module is also provided with a first detection unit for receiving a backward Brillouin scattering signal returned by the induction optical fiber; the detection module is also provided with a data acquisition unit which is connected with the first detection unit and used for receiving and processing the Brillouin scattering signal to obtain a Brillouin frequency spectrum;
the monitoring module comprises a data processing unit and a data analysis unit; the data processing unit is connected with the data acquisition unit and used for receiving the Brillouin spectrum sent by the data acquisition unit, processing the Brillouin spectrum to obtain strain information of the sensing optical fiber and further obtain the track displacement; the data analysis unit is connected with the data processing unit and is used for judging whether the track displacement exceeds a preset threshold value or not; if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, judging that the track is in an unhealthy state, and sending an alarm signal;
and the terminal is connected with the data analysis unit and used for receiving the alarm signal sent by the data analysis unit.
According to the technical scheme provided by the embodiment of the application, the detection module further comprises a second detection unit, wherein the second detection unit is connected with the sensing optical fiber and is used for receiving the Raman scattering signal returned by the sensing optical fiber; the data acquisition unit is connected with the second detection unit and is used for receiving and processing the Raman scattering signal to obtain a Raman spectrum; the data processing unit is also used for receiving the Raman scattering signal and processing the Raman scattering signal to obtain the temperature strain of the induction optical fiber so as to obtain the track temperature; the data analysis unit is also used for judging whether the track temperature exceeds a preset threshold value; if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
According to the technical scheme provided by the embodiment of the application, the terminal comprises a large-screen display device, a mobile phone of an attendant or a client display device.
According to the technical scheme provided by the embodiment of the application, the first detection unit and the second detection unit receive the brillouin signal and the raman signal in real time and uninterruptedly.
According to the technical scheme provided by the embodiment of the application, the induction optical fiber comprises an inner core, a middle layer structure coating the inner core and an outer layer structure coating the middle layer; the inner core is a tightly-wrapped stress sensing optical fiber, the middle layer coating structure is a stranded steel wire or an FRP (fiber reinforced plastic) reinforcement, and the outer layer coating structure is an MDPE (polyethylene) sheath.
The invention has the beneficial effects that:
because this application still launches the pump light to the response optic fibre other end, the pump light can realize enlargiing the power of probing light. The pump light and the probe light are respectively injected from two ends of the optical fiber, when the frequency difference between the pump light and the probe light is equal to the Brillouin frequency shift of a certain section in the optical fiber, the stimulated Brillouin amplification effect can be generated in the region, and energy transfer occurs between the two beams of light. The measured signal is more accurate, so that higher-precision measurement can be realized; meanwhile, the length of the induction optical fiber can be used for measuring the length of the track, the measuring means of the induction optical fiber is distributed, the measuring precision is high, and meanwhile, the real-time monitoring, the number of measuring point positions, the measuring distance and the intrinsic safety are realized, and the electromagnetic interference is avoided; the data is processed and analyzed, and the remote monitoring is realized while the data is recorded and stored and decision and analysis basis is provided.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an urban rail monitoring system according to the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
A distributed optical fiber-based urban rail monitoring method comprises the following steps:
emitting probe light to one end of the sensing optical fiber and emitting pump light to the other end of the sensing optical fiber;
receiving a backward Brillouin scattering signal returned by the induction optical fiber;
obtaining a Brillouin frequency spectrum from the backward Brillouin scattering signal and the detection light frequency;
obtaining strain of the induction optical fiber by the Brillouin frequency spectrum, and further obtaining the track displacement;
judging whether the track displacement exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
Referring to fig. 1, the sensing fiber is generally a whole fiber, and is laid on the running rail of the urban rail.
Emitting detection light to one end of the induction optical fiber, wherein the detection light is mainly used for detection; the Brillouin scattering signal is received, a Brillouin spectrum is further obtained, strain of the induction optical fiber is obtained through the Brillouin spectrum, and the displacement of the rail can be further obtained as the induction optical fiber is laid on the urban rail. The track displacement is the distance between a certain position of the track and the healthy track in different directions, and specifically comprises micro displacement, deformation, inclination, settlement, arching and the like. Judging whether the displacement exceeds a preset threshold value or not so as to judge whether the track is healthy or not; if the terminal is unhealthy, an alarm signal can be sent, and the staff receives the alarm signal from different terminals to intervene in the treatment in time, so that accidents are reduced. The preset threshold value is the maximum distance of a certain position deviation healthy track which is acceptable for normal running of the rail train.
The sensing optical fiber is closely attached to the outer side of the urban rail, when the rail is deformed at a certain position, the frequency shift of light in the optical cable can be changed, the displacement corresponding to the rail can be calculated through demodulation of light signals, and meanwhile, whether the displacement exceeds a threshold value or not is judged, and alarm information is sent if the displacement exceeds the threshold value. The rail displacement is remotely monitored and used as a basis for data study and judgment and decision-making.
Because this application still launches the pump light to the response optic fibre other end, the pump light can realize enlargiing the power of probing light. The pump light and the probe light are respectively injected from two ends of the optical fiber, when the frequency difference between the pump light and the probe light is equal to the Brillouin frequency shift of a certain section in the optical fiber, the stimulated Brillouin amplification effect can be generated in the region, and energy transfer occurs between the two beams of light. The measured signal is more accurate, so that higher-precision measurement can be realized; meanwhile, the measuring means of the induction optical fiber is distributed, and the length of the induction optical fiber can be measured; the data is processed and analyzed, and the remote monitoring is realized while the data is recorded and stored and decision and analysis basis is provided.
In an embodiment of the present application, the backward brillouin scattering signal returned by the sensing optical fiber is received, and simultaneously, the raman scattering signal returned by the sensing optical fiber is also received;
obtaining a Raman spectrum from the Raman scattering signal;
obtaining temperature strain of the sensing optical fiber by Raman spectrum, and further obtaining track temperature;
judging whether the track temperature exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
Referring to fig. 1, a raman scattering signal is received. The Raman scattering phenomenon can occur when light propagates in the sensing optical fiber, stokes light and anti-Stokes light are generated, the light energy-power loss ratio is obtained according to the frequency ratio of the anti-Stokes light and the Stokes light, and the sensing temperature of the sensing optical fiber is obtained, namely the track temperature. And further storing and analyzing the track temperature, alarming when the track temperature exceeds a preset threshold value, and timely intervening and processing by workers to realize remote track monitoring. The temperature measurement performance of +/-1 ℃ measurement error can be realized at the sensing tail end 50 kilometers, and the false alarm rate is avoided. Meanwhile, the displacement, namely the deformation and the temperature of the track are monitored, and the monitoring is more comprehensive.
In an embodiment of the present application, before receiving the backward brillouin scattering signal and the raman scattering signal returned by the sensing optical fiber, noise reduction processing is performed on the received signal.
Specifically, the noise reduction processing includes the steps of:
carrying out grid division on the collected receiving signals, and taking the corner points of each grid as nodes;
selecting characteristic points of received signals and tracking the characteristic points between the previous frame and the next frame;
calculating global homography matrixes of the previous frame and the next frame of the tracked feature points, and projecting the positions of nodes of the previous frame to the current frame;
storing the motion vector of the feature point on the current frame, which is less than a certain threshold value from the node, into the motion vector Buffer of the node;
performing median filtering on the motion vector Buffer, and taking the result after the median filtering as the motion vector of the node;
traversing all grids, solving a homography matrix of the grid motion by using the motion vectors of the four nodes of the grids, and then constructing a mapping graph with pixels in the grids by using the homography matrix;
aligning the pixel positions according to the mapping maps, overlapping the mapping maps, and constructing the mapping maps of accumulated motion among different frames;
averaging the pixels with the pixel gray value difference smaller than a certain threshold value between different aligned frames to serve as the gray value of the current frame;
and obtaining the optimal signal-to-noise ratio through non-local mean image filtering.
The method comprises the steps of preprocessing, feature point tracking, motion solving, motion filtering, mapping construction, pixel alignment, fusion and other image noise reduction algorithm steps, wherein the noise reduction processing is carried out on an original signal, and meanwhile, the optimal signal-to-noise ratio is obtained through non-local mean image filtering. Because the received signal is subjected to noise reduction, the received signal can be more accurate, the demodulated strain quantity and strain temperature are more accurate, and measurement and monitoring with higher accuracy are realized.
In an embodiment of the present application, the backward brillouin scattering signal is received uninterruptedly, and the frequency difference between the pumping light and the probe light is received uninterruptedly by continuous scanning, so as to obtain brillouin frequency spectrums at different positions of the sensing optical fiber, and further obtain the strain capacity of the whole sensing optical fiber.
Specifically, by scanning the frequency of the probe light, a brillouin spectrum of any point of the optical fiber can be obtained, so that distributed strain is obtained, and further strain of the whole induction optical fiber is obtained. The comprehensive and long-distance monitoring of the urban rails is realized, and the monitoring range is wider.
In an embodiment of the present application, the raman scattering signal is continuously received, and the receiving time is recorded, so as to obtain the position of the temperature strain of the sensing optical fiber, and further obtain the temperature strain of the entire sensing optical fiber.
Specifically, the distance of propagation can be known according to the speed and the time of light propagation, so can obtain the position of strain temperature, and then obtain the position of track temperature, on track deformation monitoring basis, realize that urban rail is comprehensive, long distance temperature monitoring, and monitoring range is wider.
Example two
The system of the urban rail monitoring method based on the distributed optical fiber comprises the following steps: the induction optical fiber is laid on the urban rail walking rail; the detection module is provided with a first laser unit and a second laser unit, and the first laser unit is connected with one end of the sensing optical fiber and used for emitting detection light to the sensing optical fiber; the second laser unit is connected with the other end of the sensing optical fiber and used for emitting pump light to the sensing optical fiber; the detection module is also provided with a first detection unit for receiving a backward Brillouin scattering signal returned by the induction optical fiber; the detection module is also provided with a data acquisition unit which is connected with the first detection unit and used for receiving and processing the Brillouin scattering signal to obtain a Brillouin frequency spectrum; the monitoring module comprises a data processing unit and a data analysis unit; the data processing unit is connected with the data acquisition unit and used for receiving the Brillouin spectrum sent by the data acquisition unit, processing the Brillouin spectrum to obtain strain information of the sensing optical fiber and further obtain the track displacement; the data analysis unit is connected with the data processing unit and is used for judging whether the track displacement exceeds a preset threshold value or not; if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, judging that the track is in an unhealthy state, and sending an alarm signal; and the terminal is connected with the data analysis unit and used for receiving the alarm signal sent by the data analysis unit.
Referring specifically to fig. 1, the detection module is generally a detection host. The first laser unit or the second laser unit is an ultra-narrow linewidth semiconductor laser light source used for sending probe light or pumping light. The first detection unit is used for weak signal detection, and the data acquisition unit is used for ultra-high-speed data acquisition, so that the monitoring is more accurate and reliable.
The system injects detection light and pumping light into two ends of the induction optical fiber, when the frequency difference between the pumping light and the detection light and the Brillouin frequency phase shift of a certain section in the optical fiber are equal, a stimulated Brillouin amplification effect can be generated in the region, and energy transfer occurs between two beams of light. The measuring precision is higher, the length of the induction optical fiber can be measured, the measuring means of the induction optical fiber is distributed, and the monitoring has the characteristics of real-time monitoring, more measuring point positions, long measuring distance, intrinsic safety and no electromagnetic interference; meanwhile, the data is processed and analyzed, the data is recorded and stored, and a decision and analysis basis is provided, and meanwhile, remote monitoring is achieved.
In an embodiment of the present application, the detection module further includes a second detection unit, where the second detection unit is connected to the sensing optical fiber and is configured to receive a raman scattering signal returned by the sensing optical fiber; the data acquisition unit is connected with the second detection unit and is used for receiving and processing the Raman scattering signal to obtain a Raman spectrum; the data processing unit is also used for receiving the Raman scattering signals and processing the Raman scattering signals to obtain the temperature strain of the induction optical fiber so as to obtain the track temperature; the data analysis unit is also used for judging whether the track temperature exceeds a preset threshold value; if not, judging the track to be in a healthy state; if the track state exceeds the preset threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
The system realizes dual monitoring and control of track displacement and track temperature, has high precision and small error, and can be used as an effective data analysis basis.
In an embodiment of the application, the terminal includes a large-screen display device, a mobile phone of an attendant, or a client display device.
Specifically, the alarm information can be sent to the terminal in a short message mode, and the terminal can be a large-screen display device, a mobile phone of an attendant or a client display device, so that safety and reliability of the train, efficiency improvement and energy conservation are ensured, and intelligent operation and maintenance management of the subway is realized.
In an embodiment of the present application, the first detection unit and the second detection unit receive the brillouin signal and the raman signal in real time and uninterruptedly.
Specifically, by receiving signals and scanning the frequency of the detected light in real time and uninterruptedly, the brillouin spectrum of any point of the optical fiber can be obtained, thereby obtaining distributed strain and temperature measurement.
In one embodiment of the present application, the sensing optical fiber includes an inner core, a middle layer structure coating the inner core, and an outer layer structure coating the middle layer; the inner core is a tightly-wrapped stress sensing optical fiber, the middle layer coating structure is a stranded steel wire or an FRP (fiber reinforced plastic) reinforcement, and the outer layer coating structure is an MDPE (polyethylene) sheath.
Specifically, the FRP reinforcement is a reinforcement of a Fiber Reinforced composite (Fiber Reinforced polymer); the MDPE sheath is made of Medium density polyethylene (Medium density polyethylene) material.
The sensing optical fiber consists of a tightly-packed stress sensing optical fiber of a central core, an outer layer stranded steel wire or FRP (fiber reinforced Plastic) reinforcement and an MDPE (Medium-Density polyethylene) sheath, so that the service life of the sensing optical fiber can reach 30 years.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A distributed optical fiber-based urban rail monitoring method is characterized by comprising the following steps:
emitting probe light to one end of the sensing optical fiber and emitting pump light to the other end of the sensing optical fiber;
receiving a backward Brillouin scattering signal returned by the induction optical fiber;
obtaining a Brillouin frequency spectrum from the backward Brillouin scattering signal and the detection light frequency;
obtaining strain of the induction optical fiber by the Brillouin frequency spectrum, and further obtaining the track displacement;
judging whether the track displacement exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the preset threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
2. The method of claim 1, wherein the urban rail transit monitoring system comprises a monitoring center,
receiving backward Brillouin scattering signals returned by the induction optical fiber, and simultaneously receiving Raman scattering signals returned by the induction optical fiber;
obtaining a Raman spectrum from the Raman scattering signal;
obtaining temperature strain of the sensing optical fiber by Raman spectrum, and further obtaining track temperature;
judging whether the track temperature exceeds a preset threshold value or not;
if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
3. The urban rail monitoring method based on the distributed optical fiber as claimed in claim 1 or 2, wherein noise reduction processing is performed on the received signal before receiving the backward Brillouin scattering signal and the Raman scattering signal returned by the sensing optical fiber.
4. The urban orbit monitoring method based on the distributed optical fiber according to claim 1, characterized in that the backward brillouin scattering signal is received uninterruptedly, and the frequency difference between the pumping light and the probe light is received uninterruptedly and continuously by scanning, so as to obtain brillouin spectra at different positions of the sensing optical fiber, and further obtain the strain of the whole sensing optical fiber.
5. The distributed optical fiber-based urban rail monitoring method according to claim 2, wherein the raman scattering signal is continuously received, and the receiving time is recorded to obtain the position of the temperature strain of the sensing optical fiber, thereby obtaining the temperature strain of the entire sensing optical fiber.
6. A system adopting the distributed optical fiber-based urban rail monitoring method according to claims 1 to 5, comprising:
the induction optical fiber is laid on the urban rail walking rail;
the detection module is provided with a first laser unit and a second laser unit, and the first laser unit is connected with one end of the sensing optical fiber and used for emitting detection light to the sensing optical fiber; the second laser unit is connected with the other end of the sensing optical fiber and used for emitting pump light to the sensing optical fiber; the detection module is also provided with a first detection unit for receiving a backward Brillouin scattering signal returned by the induction optical fiber; the detection module is also provided with a data acquisition unit which is connected with the first detection unit and used for receiving and processing the Brillouin scattering signal to obtain a Brillouin frequency spectrum;
the monitoring module comprises a data processing unit and a data analysis unit; the data processing unit is connected with the data acquisition unit and used for receiving the Brillouin spectrum sent by the data acquisition unit, processing the Brillouin spectrum to obtain strain information of the sensing optical fiber and further obtain the track displacement; the data analysis unit is connected with the data processing unit and is used for judging whether the track displacement exceeds a preset threshold value or not; if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, judging that the track is in an unhealthy state, and sending an alarm signal;
and the terminal is connected with the data analysis unit and used for receiving the alarm signal sent by the data analysis unit.
7. The system of the distributed optical fiber-based urban rail monitoring method according to claim 6, wherein the detection module further comprises a second detection unit, the second detection unit is connected to the sensing optical fiber and is configured to receive the Raman scattering signal returned by the sensing optical fiber;
the data acquisition unit is connected with the second detection unit and is used for receiving and processing the Raman scattering signal to obtain a Raman spectrum;
the data processing unit is also used for receiving the Raman scattering signal and processing the Raman scattering signal to obtain the temperature strain of the induction optical fiber so as to obtain the track temperature;
the data analysis unit is also used for judging whether the track temperature exceeds a preset threshold value; if not, judging the track to be in a healthy state; if the track state exceeds the set threshold value, the track is judged to be in an unhealthy state, and an alarm signal is sent.
8. The system of the distributed optical fiber-based urban rail monitoring method according to claim 7, wherein the terminal comprises a large-screen display device, a mobile phone of an attendant, or a client display device.
9. The system of the distributed optical fiber-based urban rail monitoring method according to claim 7, wherein the first detection unit and the second detection unit receive the brillouin signal and the raman signal in real time and uninterruptedly.
10. The system of the distributed optical fiber-based urban rail monitoring method according to claim 6, wherein the sensing optical fiber comprises an inner core, a middle layer structure coating the inner core, and an outer layer structure coating the middle layer; the inner core is a tightly-wrapped stress sensing optical fiber, the middle layer coating structure is a stranded steel wire or an FRP (fiber reinforced plastic) reinforcement, and the outer layer coating structure is an MDPE (polyethylene) sheath.
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| CN117490738A (en) * | 2023-10-31 | 2024-02-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Optical fiber sensing method, optical fiber sensing device, computer equipment, medium and computer product |
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| CN117490738A (en) * | 2023-10-31 | 2024-02-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Optical fiber sensing method, optical fiber sensing device, computer equipment, medium and computer product |
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