Method for monitoring icing tension of in-operation OPGW based on micrometeorological temperature demodulation BOTDR (Brillouin Optical Time Domain Reflectometer)

Abstract

The invention discloses an in-operation OPGW icing tension monitoring method based on a micrometeorological temperature demodulation BOTDR. The method comprises the following steps: measuring through a Brillouin optical time domain reflectometer to obtain OPGW Brillouin frequency shift data; calibrating a Brillouin frequency shift temperature sensitivity coefficient and a Brillouin frequency shift tension sensitivity coefficient of the OPGW by using the data of the microclimate icing monitoring terminal; according to the Brillouin scattering principle, all Brillouin frequency shifts are converted into Brillouin equivalent temperatures; the external environment temperature of the OPGW is measured through the micro-meteorological icing monitoring terminal and is defined as temperature data of the micro-meteorological icing monitoring terminal; calculating a difference value between the Brillouin equivalent temperature and the temperature data of the microclimate icing monitoring terminal; and when the temperature difference value is greater than or equal to the temperature measurement precision of the Brillouin optical time domain reflectometer, the icing tension is calculated. According to the invention, the Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift tension sensitivity coefficient can be directly calibrated on line, and the calibration result and the icing tension monitoring result are more accurate.

Description

Technical Field

[0001] This invention relates to the field of OPGW icing tension monitoring, and particularly to a method for monitoring OPGW icing tension in operation based on microclimate temperature demodulation BOTDR. Background Technology

[0002] Fiber Optic Composite Overhead Ground Wire (OPGW) is an overhead ground wire that integrates lightning protection and communication functions, and it has been widely used in my country's power grid. OPGW is usually installed at the highest point of overhead transmission lines, above the conductors, to prevent lightning strikes on the lines. Simultaneously, its built-in fiber optic communication capability is crucial to the safe and stable operation of the power system.

[0003] In recent years, icing disasters have occurred frequently across my country, severely impacting daily life and power grid safety. With the development of distributed optical fiber sensing technology, Brillouin scattering-based distributed optical fiber sensing technology has provided a new technical means for OPGW icing monitoring. However, BOTDR (Brillouin Optical Time-Domain Reflectometer) suffers from cross-sensitivity to temperature and strain, limiting its application in OPGW icing monitoring. Accurately measuring the icing tension of OPGW lines using BOTDR can provide crucial data support for subsequent icing monitoring. Therefore, a new method for demodulating BOTDR to achieve OPGW icing tension monitoring is needed.

[0004] Common demodulation methods for BOTDR in engineering applications include the reference fiber method, the dual-parameter matrix method, the combined physical effect measurement method, and the special fiber measurement method. The reference fiber method involves laying a section of fiber near the optical cable that is only affected by temperature, using the temperature information of this fiber to decouple the cable's temperature and strain. However, OPGW lines are directly exposed to harsh outdoor environments, making it unsuitable to lay reference temperature fibers nearby. The dual-parameter matrix method measures the power and frequency shift of Brillouin scattering in the target fiber, using its matrix relationship with temperature and strain to decouple temperature and strain. However, OPGW lines can be hundreds of kilometers long, and many factors can affect Brillouin power measurement in the field, making this method unsuitable for long-distance sensing. The combined physical effect measurement method combines the physical effects of other scattered light in the fiber, such as the temperature-sensitive characteristic of Raman scattering, to achieve decoupling of temperature and strain in Brillouin scattering. However, this method requires the use of Raman scattering, increasing costs, and the inconsistent spatial resolution of the two methods complicates the decoupling technique. The special fiber measurement method directly determines temperature and strain by measuring the unique multi-peak effect of special fibers. However, OPGW uses ordinary single-mode fiber, so this method cannot be used (Li Yongqian, Fan Haijun, Zhang Lixin, et al. A review of solutions to cross-sensitivity in Brillouin scattering [J]. Semiconductor Optoelectronics, 2021, 42(03):301-307).

[0005] Meanwhile, the Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient calibration methods commonly used in BOTDR are all calibrated in laboratory conditions. There is no field calibration method for operating lines, and the laboratory calibration results have certain errors for operating OPGW lines. Summary of the Invention

[0006] This invention provides a method for monitoring icing tension of operating OPGW based on micro-meteorological temperature demodulation BOTDR, which can solve the problem of monitoring icing tension of operating OPGW using BOTDR. At the same time, it utilizes a Brillouin optical time domain reflectometer combined with a micro-meteorological icing monitoring terminal to monitor the icing tension of OPGW lines. A new calibration method for the Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift tension sensitivity coefficient is used to improve the accuracy of calibration results, thereby improving the accuracy of OPGW icing tension monitoring results.

[0007] The present invention addresses the problem that existing BOTDR demodulation methods cannot be applied to OPGW icing monitoring, and also proposes a calibration method for the Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient applicable to in-operation OPGW lines.

[0008] To achieve the objective of this invention, this invention provides a method for monitoring icing tension of an operating OPGW based on microclimate temperature demodulation BOTDR, comprising the following steps:

[0009] The Brillouin frequency shift data of OPGW were obtained by measuring the Brillouin optical time-domain reflectometer.

[0010] The Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient of OPGW were calibrated using data from a micro-meteorological icing monitoring terminal.

[0011] Based on the Brillouin scattering principle, the entire Brillouin frequency shift is converted into the Brillouin equivalent temperature;

[0012] The external ambient temperature of the OPGW is measured by the micro-meteorological icing monitoring terminal and is defined as the temperature data of the micro-meteorological icing monitoring terminal.

[0013] Calculate the difference between the Brillouin equivalent temperature and the temperature data from the microclimate icing monitoring terminal;

[0014] When the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer, the icing tension is calculated.

[0015] When calibrating the Brillouin frequency shift temperature sensitivity coefficient, Brillouin frequency shift data and temperature data from micro-meteorological icing monitoring terminals at multiple non-icing times within a preset time period are selected and plotted on a single chart. The slope of the resulting curve is the Brillouin frequency shift temperature sensitivity coefficient, and the intercept is the Brillouin temperature constant.

[0016] Furthermore, the Brillouin equivalent temperature is converted using the following formula:

[0017]

[0018] In the formula, t1 is the Brillouin equivalent temperature; ν B For Brillouin shift; C t K is the temperature sensitivity coefficient of the Brillouin frequency shift. t is the Brillouin temperature constant.

[0019] Furthermore, the Brillouin temperature shift is determined by the calibrated Brillouin temperature shift sensitivity coefficient, the Brillouin temperature constant, and the temperature of the microclimate icing monitoring terminal.

[0020] Furthermore, the formula for determining the Brillouin temperature shift is:

[0021] ν t =C t ·t2+K t

[0022] In the formula, ν t For Brillouin temperature shift; C t K is the temperature sensitivity coefficient of the Brillouin frequency shift. t t1 is the Brillouin temperature constant; t2 is the temperature of the microclimate icing monitoring terminal.

[0023] Furthermore, when the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time-domain reflectometer, it is expressed as:

[0024] |t1-t2|≥δ t

[0025] In the formula, δ t t1 represents the temperature measurement accuracy of BOTDR; t2 represents the Brillouin equivalent temperature; and t2 represents the temperature of the microclimate icing monitoring terminal.

[0026] Furthermore, the Brillouin tension is calculated using the following formula:

[0027]

[0028] In the formula, F1 is the icing tension; ν B For Brillouin shift; ν t For Brillouin temperature shift; C F K is the Brillouin frequency shift tension sensitivity coefficient; F Let be the Brillouin tension constant.

[0029] Furthermore, during the calibration of the Brillouin frequency shift tension sensitivity coefficient, the Brillouin frequency shift at the icing moment and the temperature and tension of the micrometeorological icing monitoring terminal were selected. Using the relationship between the calibrated Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift, the temperature-affected Brillouin frequency shift at the icing moment was subtracted from the Brillouin frequency shift at the icing moment. The remaining value is the tension-affected Brillouin frequency shift. This tension-affected Brillouin frequency shift and the tension of the micrometeorological icing monitoring terminal were plotted on a graph. The slope of the resulting curve is the Brillouin frequency shift tension sensitivity coefficient, and the intercept is the Brillouin tension constant.

[0030] This invention also provides an in-operation OPGW icing tension monitoring system based on microclimate temperature demodulation BOTDR, the system comprising the following modules:

[0031] The Brillouin frequency shift acquisition module is used to acquire the OPGW Brillouin frequency shift data measured by the Brillouin optical time domain reflectometer.

[0032] The calibration module is used to calibrate the Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient of OPGW using data from the micro-meteorological icing monitoring terminal.

[0033] The Brillouin equivalent temperature conversion module is used to convert all Brillouin frequency shifts into Brillouin equivalent temperatures based on the Brillouin scattering principle.

[0034] The temperature acquisition module is used to measure the external ambient temperature of the OPGW through the micro-meteorological icing monitoring terminal, and is defined as the micro-meteorological icing monitoring terminal temperature data.

[0035] The temperature difference acquisition module is used to calculate the difference between the Brillouin equivalent temperature and the temperature data from the micrometeorological icing monitoring terminal.

[0036] The tension acquisition module calculates the icing tension when the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer.

[0037] The present invention also provides a computer device.

[0038] The present invention also provides a computer-readable storage medium.

[0039] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0040] (1) This invention proposes a new method for monitoring the icing tension of OPGW based on BOTDR demodulation of micro-meteorological temperature by using the Brillouin scattering principle and combining it with micro-meteorological temperature. This method is applicable to the monitoring of icing tension of various types of OPGW.

[0041] (2) In this invention, when the temperature difference exceeds the temperature measurement accuracy, it is determined that the OPGW is affected by the icing tension, and the icing tension is calculated to realize the OPGW icing tension monitoring. The OPGW icing tension can be monitored online.

[0042] (3) The OPGW calibrated by laboratory methods is not the same as the OPGW already in operation, so there will be some errors (it is impossible to directly cut a section of an already operating OPGW for calibration). Moreover, even if the same type of OPGW is used for calibration, differences in construction technology and production batches will also lead to differences in the final results. In contrast, this invention calibrates on-site, which can obtain accurate Brillouin frequency shift temperature sensitivity coefficient, Brillouin temperature constant, Brillouin frequency shift tension sensitivity coefficient, and Brillouin frequency shift tension constant, making the final icing tension monitoring results more accurate. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating the steps of a method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR, as provided in an embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of line measurement in an embodiment of the present invention.

[0045] Figure 3 This is a Brillouin frequency shift diagram in an embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the Brillouin frequency shift temperature calibration results in an embodiment of the present invention.

[0047] Figure 5 This is a schematic diagram of the Brillouin frequency shift tension calibration results in an embodiment of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 1 The present invention provides a method for monitoring icing tension of OPGW in operation based on microclimate temperature demodulation BOTDR, comprising the following steps:

[0050] Step 1: Obtain the OPGW Brillouin frequency shift data by measuring the Brillouin optical time domain reflectometer.

[0051] In one embodiment of the present invention, a schematic diagram of the entire line measurement is shown below. Figure 2 As shown, the Brillouin frequency shift data of the OPGW line was obtained using a Brillouin optical time-domain reflectometer. The obtained Brillouin frequency shift data is as follows: Figure 3 As shown.

[0052] Step 2: Use Brillouin frequency shift data to calibrate the Brillouin frequency shift temperature sensitivity coefficient, Brillouin temperature constant, Brillouin frequency shift tension sensitivity coefficient, and Brillouin frequency shift tension constant of the OPGW line.

[0053] For the calibration of the Brillouin frequency shift temperature sensitivity coefficient, the conventional laboratory calibration method is as follows: An OPGW is placed in a laboratory freezer, and a BOTDR is connected to the OPGW to enable it to monitor the Brillouin frequency shift; then, the temperature of the freezer is continuously changed to obtain the Brillouin frequency shift at the corresponding temperature, and the result is plotted on a graph; the slope of this graph is the Brillouin frequency shift temperature sensitivity coefficient. This embodiment of the invention directly utilizes the temperature data from a micro-meteorological icing monitoring terminal for coefficient calibration. Specifically, Brillouin frequency shift data at different un-iced times within a preset time period are selected, along with temperature data from the micro-meteorological icing monitoring terminal (i.e., the external ambient temperature of the OPGW measured by the micro-meteorological icing monitoring terminal), and these are plotted on a graph (the vertical axis represents the Brillouin frequency shift, and the horizontal axis represents the temperature of the micro-meteorological icing monitoring terminal). The slope of the resulting curve represents the Brillouin frequency shift temperature sensitivity coefficient, and its intercept is the Brillouin temperature constant.

[0054] For the calibration of the Brillouin frequency shift tension sensitivity coefficient, the conventional laboratory calibration method is as follows: connect the BOTDR to the OPGW to enable it to monitor the Brillouin frequency shift, place the OPGW on a tensile testing machine, and continuously change the tensile force of the machine under constant temperature conditions to obtain the Brillouin frequency shift under the corresponding tensile force. Plot this at a graph, with the slope representing the Brillouin frequency shift tension sensitivity coefficient. This embodiment of the invention directly utilizes the tension data from the micro-meteorological icing monitoring terminal for coefficient calibration. Specifically, it selects the Brillouin frequency shift at the icing moment and the temperature and tension of the micro-meteorological icing monitoring terminal. Using the previously calibrated relationship between the Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift, it subtracts the temperature-affected Brillouin frequency shift (Brillouin temperature frequency shift) from the Brillouin frequency shift at the icing moment. The remaining value is the tension-affected Brillouin frequency shift (Brillouin tension frequency shift). This tension-affected Brillouin frequency shift and the tension of the micro-meteorological icing monitoring terminal are then plotted at a graph. The slope of the resulting curve represents the Brillouin frequency shift tension sensitivity coefficient, and its intercept is the Brillouin tension constant.

[0055] ν B =ν t +ν F =[C t ·t3+Kt ]+k F ·[C F ·F1+K F ]

[0056] In the formula: ν B For Brillouin frequency shift, ν t The Brillouin temperature shift is in MHz; ν F For Brillouin tension frequency shift, MHz; K t K F All are constants; C t t3 is the Brillouin frequency shift temperature sensitivity coefficient, MHz / kN; t3 is the temperature at which icing occurs, ℃; C F F1 is the Brillouin frequency shift tension sensitivity coefficient, MHz / kN; F1 is the icing tension of the OPGW, kN; k F The icing tension influence coefficient of OPGW is determined by the following formula:

[0057]

[0058] In the formula F r The minimum critical sensing tension for icing of OPGW is measured by BOTDR in kN.

[0059] The Brillouin temperature shift can be calculated from the calibrated Brillouin temperature shift sensitivity coefficient, the Brillouin temperature constant, and the temperature of the microclimate icing monitoring terminal.

[0060] In one embodiment of the present invention, the Brillouin frequency shift temperature calibration results in the field are as follows: Figure 4 As shown. The Brillouin frequency shift tension calibration results on site are as follows. Figure 5 As shown.

[0061] Step 3: Based on the Brillouin scattering principle, convert the entire Brillouin frequency shift into the Brillouin equivalent temperature.

[0062] In this step, the Brillouin frequency shift data is converted to Brillouin equivalent temperature using the following formula.

[0063]

[0064] In the formula, t1 is the Brillouin equivalent temperature, in °C; ν B For Brillouin frequency shift, MHz; C t The temperature sensitivity coefficient for Brillouin frequency shift is given in MHz / ℃; K. t is the Brillouin temperature constant.

[0065] Step 4: Obtain the ambient temperature t2 of the OPGW through the micro-meteorological icing monitoring terminal.

[0066] The temperature and tension data obtained through the micro-meteorological icing monitoring terminal are defined as the temperature and tension of the micro-meteorological icing monitoring terminal, respectively.

[0067] Micro-meteorological icing monitoring terminals are existing products. They will not be discussed in detail here. This device is installed on power line towers to monitor temperature and tension data.

[0068] Step 5: Calculate the difference between the Brillouin equivalent temperature t1 and the ambient temperature t2 of the OPGW obtained by the micro-meteorological icing monitoring terminal.

[0069] In this step, the temperature difference is calculated using the following formula, and it is determined whether the temperature difference is greater than the temperature measurement accuracy:

[0070] |t1-t2|≥δ t

[0071] In the formula δ t The temperature measurement accuracy of the BOTDR is expressed in °C.

[0072] The temperature measurement accuracy is a range that the BOTDR itself has for temperature monitoring, and this value is a known value for each BOTDR device.

[0073] Step 6: When the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer, the icing tension is calculated using the Brillouin tension formula.

[0074] The Brillouin tension formula is:

[0075] ν t =C t ·t2+K t

[0076]

[0077] In the formula, F1 is the icing tension, N; C F K is the Brillouin frequency shift tension sensitivity coefficient, MHz / ℃; F Let ν be the Brillouin tension constant. t This refers to the Brillouin temperature shift.

[0078] Step 7: Steps 3 to 6 are performed simultaneously on each OPGW line to achieve full-line icing tension monitoring.

[0079] In one embodiment of the present invention, an in-operation OPGW icing tension monitoring system based on microclimate temperature demodulation BOTDR is provided to implement the steps of the method provided in the foregoing embodiments. The system includes the following modules:

[0080] The Brillouin frequency shift acquisition module is used to acquire the OPGW Brillouin frequency shift data measured by the Brillouin optical time domain reflectometer.

[0081] The calibration module is used to calibrate the Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient of OPGW using data from the micro-meteorological icing monitoring terminal.

[0082] The Brillouin equivalent temperature conversion module is used to convert all Brillouin frequency shifts into Brillouin equivalent temperatures based on the Brillouin scattering principle.

[0083] The temperature acquisition module is used to measure the external ambient temperature of the OPGW through the micro-meteorological icing monitoring terminal, and is defined as the micro-meteorological icing monitoring terminal temperature data.

[0084] The temperature difference acquisition module is used to calculate the difference between the Brillouin equivalent temperature and the temperature data from the micrometeorological icing monitoring terminal.

[0085] The tension acquisition module calculates the icing tension when the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer.

[0086] In one embodiment of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method provided in the foregoing embodiments.

[0087] In one embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the method provided in the foregoing embodiments.

[0088] This invention calibrates the Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift tension sensitivity coefficient using a micro-meteorological icing monitoring terminal. The Brillouin frequency shift of the OPGW is measured using a Brillouin optical time-domain reflectometer, and the temperature is measured using the micro-meteorological icing monitoring terminal. The Brillouin frequency shift is converted into an equivalent Brillouin temperature using the Brillouin scattering principle. This equivalent Brillouin temperature is then compared with the temperature measured by the micro-meteorological icing monitoring terminal on the line, and the difference is calculated. When the temperature difference exceeds the temperature measurement accuracy, the icing tension is calculated using the Brillouin tension calculation formula. This enables monitoring of the icing tension of the OPGW in operation. Compared to calibration in a laboratory, this invention allows direct calibration of the Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift tension sensitivity coefficient of the OPGW using data obtained from the Brillouin optical time-domain reflectometer and the micro-meteorological icing monitoring terminal. The calibration results are more accurate, leading to more precise monitoring of the icing tension of the OPGW in operation.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in this invention may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for monitoring icing tension of operating OPGW based on microclimate temperature demodulation BOTDR, characterized in that, Includes the following steps: The Brillouin frequency shift data of OPGW were obtained by measuring the Brillouin optical time-domain reflectometer. The Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient of OPGW were calibrated using data from a micro-meteorological icing monitoring terminal. Based on the Brillouin scattering principle, the entire Brillouin frequency shift is converted into the Brillouin equivalent temperature; The external ambient temperature of the OPGW is measured by the micro-meteorological icing monitoring terminal and is defined as the temperature data of the micro-meteorological icing monitoring terminal. Calculate the difference between the Brillouin equivalent temperature and the temperature data from the microclimate icing monitoring terminal; When the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer, the icing tension is calculated. When calibrating the Brillouin frequency shift temperature sensitivity coefficient, Brillouin frequency shift data and temperature data from micro-meteorological icing monitoring terminals at multiple non-icing times within a preset time period are selected and plotted on a single chart. The slope of the resulting curve is the Brillouin frequency shift temperature sensitivity coefficient, and the intercept is the Brillouin temperature constant.

2. The method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR according to claim 1, characterized in that, The Brillouin equivalent temperature conversion is performed using the following formula: In the formula, t1 is the Brillouin equivalent temperature; ν B For Brillouin shift; C t K is the temperature sensitivity coefficient of the Brillouin frequency shift. t is the Brillouin temperature constant.

3. The method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR according to claim 1, characterized in that, The Brillouin temperature shift is determined by the Brillouin temperature shift sensitivity coefficient, the Brillouin temperature constant, and the temperature of the microclimate icing monitoring terminal obtained through calibration.

4. The method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR according to claim 3, characterized in that, Formula for determining Brillouin temperature shift: n t =C t ·t2+K t In the formula, ν t For Brillouin temperature shift; C t K is the temperature sensitivity coefficient of the Brillouin frequency shift. t t1 is the Brillouin temperature constant; t2 is the temperature of the microclimate icing monitoring terminal.

5. The method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR according to claim 1, characterized in that, When the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer, it is expressed as: |t1-t2|≥δ t In the formula, δ t t1 represents the temperature measurement accuracy of BOTDR; t2 represents the Brillouin equivalent temperature; and t2 represents the temperature of the microclimate icing monitoring terminal.

6. The method for monitoring icing tension of OPGW in operation based on microclimate temperature demodulation BOTDR according to claim 1, characterized in that, Brillouin tension is calculated using the following formula: In the formula, F1 is the icing tension; ν B For Brillouin shift; ν t For Brillouin temperature shift; C F K is the Brillouin frequency shift tension sensitivity coefficient; F Let be the Brillouin tension constant.

7. A method for monitoring icing tension of an OPGW in operation based on microclimate temperature demodulation BOTDR according to any one of claims 1-6, characterized in that, When calibrating the Brillouin frequency shift tension sensitivity coefficient, the Brillouin frequency shift at the icing moment is selected in relation to the temperature and tension of the micro-meteorological icing monitoring terminal. Using the relationship between the calibrated Brillouin frequency shift temperature sensitivity coefficient and the Brillouin frequency shift, the temperature-affected Brillouin frequency shift at the icing moment is subtracted from the Brillouin frequency shift at the icing moment. The remaining value is the tension-affected Brillouin frequency shift. This tension-affected Brillouin frequency shift and the tension of the micro-meteorological icing monitoring terminal are plotted on a graph. The slope of the resulting curve is the Brillouin frequency shift tension sensitivity coefficient, and the intercept is the Brillouin tension constant.

8. A system for monitoring icing tension of an in-operation OPGW based on microclimate temperature demodulation BOTDR, characterized in that, For implementing the method of any one of claims 1-7, the system comprises the following modules: The Brillouin frequency shift acquisition module is used to acquire the OPGW Brillouin frequency shift data measured by the Brillouin optical time domain reflectometer. The calibration module is used to calibrate the Brillouin frequency shift temperature sensitivity coefficient and Brillouin frequency shift tension sensitivity coefficient of OPGW using data from the micro-meteorological icing monitoring terminal. The Brillouin equivalent temperature conversion module is used to convert all Brillouin frequency shifts into Brillouin equivalent temperatures based on the Brillouin scattering principle. The temperature acquisition module is used to measure the external ambient temperature of the OPGW through the micro-meteorological icing monitoring terminal, and is defined as the micro-meteorological icing monitoring terminal temperature data. The temperature difference acquisition module is used to calculate the difference between the Brillouin equivalent temperature and the temperature data from the micrometeorological icing monitoring terminal. The tension acquisition module calculates the icing tension when the temperature difference is greater than or equal to the temperature measurement accuracy of the Brillouin optical time domain reflectometer.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1-7.

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