Cable monitoring method and system

Abstract

The present application discloses a cable monitoring method and system, which can improve the accuracy of cable monitoring. The method includes: obtaining coding change information, the coding change information includes real-time coding information of multiple optical fiber codes, the optical fiber codes are set at different positions on the composite cable, and the optical fiber codes are used to change the coding according to the sensed environmental changes. The initial coding information of each optical fiber code is obtained, and the initial coding information is compared and analyzed with the real-time coding information to obtain the wavelength offset of the optical fiber code. According to the wavelength offset of each optical fiber code, the offset difference between the multiple optical fiber codes is determined. If the offset difference does not exceed the preset offset, it is determined that the composite cable has a temperature change, and the target temperature value of the composite cable is calculated. If the offset difference exceeds the preset offset, it is determined that the composite cable has a stress change, and a stress analysis is performed on the composite cable to obtain a stress analysis result.

Description

Technical Field

[0001] The present application relates to the field of optical fiber monitoring technology, and in particular to a cable monitoring method and system. Background Art

[0002] Existing composite cables can use optical fibers with fiber codes. Since fiber codes have the sensing characteristics of external environmental factors such as temperature and stress, various parameters in the composite cable line can be monitored by identifying the fiber codes. However, this method still cannot independently identify the impact of temperature and stress on the changes in composite cable line parameters, resulting in low monitoring accuracy. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a cable monitoring method and system, which can improve the accuracy of cable monitoring.

[0004] A cable monitoring method according to an embodiment of the first aspect of the present application includes:

[0005] Acquiring coding change information, the coding change information including real-time coding information of a plurality of optical fiber codes, the optical fiber codes being arranged at different positions on the composite cable, the optical fiber codes being used to change coding according to sensed environmental changes;

[0006] Acquire initial coding information of each of the optical fiber codes, and compare and analyze the initial coding information with the real-time coding information to obtain the wavelength offset of the optical fiber code;

[0007] Determining the offset difference between the plurality of optical fiber codes according to the wavelength offset of each optical fiber code;

[0008] If the offset difference does not exceed the preset offset, determining that the composite cable has a temperature change, and calculating a target temperature value of the composite cable;

[0009] If the offset difference exceeds the preset offset, it is determined that stress changes exist in the composite cable, and stress analysis is performed on the composite cable according to the wavelength offsets of the optical fiber codes to obtain stress analysis results.

[0010] According to some embodiments of the present application, one end of the composite cable is connected to a first pole tower, and the other end of the composite cable is connected to a second pole tower, and the coding change information further includes wavelength change times of a plurality of the optical fiber codes; and performing stress analysis on the composite cable according to the wavelength offset of each of the optical fiber codes to obtain a stress analysis result includes:

[0011] Determining whether the wavelength change time exceeds a preset change time;

[0012] If the wavelength change time does not exceed the preset change time, it is determined that the composite cable is dancing, and the dancing direction of the composite cable is determined and the dancing amplitude of the composite cable is calculated according to the wavelength offset of each optical fiber code;

[0013] If the wavelength change time exceeds the preset change time, it is determined that the tower has sunk, then according to the wavelength offsets of the optical fiber codes, a target tower that has sunk is determined from the first tower and the second tower, and the sunk height of the target tower is calculated.

[0014] According to some embodiments of the present application, determining the dancing direction of the composite cable according to the wavelength offset of each optical fiber encoding includes:

[0015] Determine the wavelength variation trend of the optical fiber code according to the wavelength offset of each optical fiber code, and traverse all the optical fiber codes according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower;

[0016] If the wavelength variation trend of each of the optical fiber codes increases synchronously, the side wind direction is determined as the dancing direction of the composite cable, and the side wind direction forms a certain angle with the extension direction;

[0017] If, during the traversal process, the optical fiber code with an increasing wavelength variation trend is traversed first, and then the optical fiber code with a decreasing wavelength variation trend is traversed, the extending direction is determined as the dancing direction of the composite cable;

[0018] If during the traversal process, the optical fiber code with a decreasing wavelength variation trend is traversed first, and then the optical fiber code with an increasing wavelength variation trend is traversed, the direction opposite to the extending direction is determined as the dancing direction of the composite cable.

[0019] According to some embodiments of the present application, the method further includes:

[0020] Obtaining a geographical distance difference between the first tower and the second tower;

[0021] The calculating the dancing amplitude of the composite cable comprises:

[0022] The optical fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two optical fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively;

[0023] Calculating the current tension value of the optical fiber code according to the wavelength offset of each optical fiber code;

[0024] Calculate the current height and current position of the current sag bottom according to the current tension values ​​of the first code, the second code, and the third code, combined with the geographical distance difference;

[0025] The galloping amplitude of the composite cable is determined according to the current height and the current position of the current sag bottom.

[0026] According to some embodiments of the present application, determining the target pole tower having subsided from the first pole tower and the second pole tower according to the wavelength offset of each of the optical fiber codes includes:

[0027] Determine the wavelength variation trend of the optical fiber code according to the wavelength offset of each optical fiber code, and traverse all the optical fiber codes according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower;

[0028] If, during the traversal process, the optical fiber code with a decreasing wavelength variation trend is traversed first, and the optical fiber code with an increasing wavelength variation trend is traversed later, the first pole tower is determined as the target pole tower with settlement;

[0029] If, during the traversal process, the optical fiber code with an increasing wavelength variation trend is traversed first, and the optical fiber code with a decreasing wavelength variation trend is traversed later, the second pole tower is determined as the target pole tower that has subsided.

[0030] According to some embodiments of the present application, the calculating the settlement height of the target tower includes:

[0031] The optical fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two optical fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively; the initial tower height difference between the first tower and the second tower is obtained; the current tower height difference between the first tower and the second tower is determined according to the real-time coding information corresponding to the first code, the second code and the third code respectively; the settlement height of the target tower is obtained according to the difference between the initial tower height difference and the current tower height difference.

[0032] According to some embodiments of the present application, after determining that the composite cable has stress changes, and before performing stress analysis on the composite cable according to the wavelength offsets of the optical fiber codes to obtain stress analysis results, the method further includes:

[0033] A minimum offset is determined among the multiple optical fiber-coded wavelength offsets; and the minimum offset is subtracted from the optical fiber-coded wavelength offset to obtain a new wavelength offset.

[0034] According to some embodiments of the present application, the real-time coding information further includes the real-time energy and real-time distance of the optical fiber coding, and the initial coding information further includes the initial energy of the optical fiber coding; after comparing and analyzing the initial coding information with the real-time coding information, the method further includes:

[0035] If the initial coding information includes a fiber code that does not appear in the real-time coding information, taking the fiber code that does not appear in the real-time coding information as the fourth code, and determining the interruption position and calculating the position information of the interruption position according to the real-time distance of the fourth code;

[0036] Alternatively, if there is a fifth code, the attenuation segment is determined according to the real-time distance of the fifth code and the position information of the attenuation segment is calculated, and the fifth code satisfies: the difference between the real-time energy of the fifth code and the initial energy exceeds a preset energy value.

[0037] A cable monitoring system according to an embodiment of the second aspect of the present application includes:

[0038] A composite cable, comprising a conducting part, a protective tube and an optical fiber segment; the optical fiber segment is provided with at least one optical fiber code, the optical fiber segment is in contact with the conducting part and the optical fiber segment is arranged between the protective tube and the conducting part, and the optical fiber code can change in code according to a sensed environmental change;

[0039] An identification device is connected to the composite cable to monitor the optical fiber coding.

[0040] The cable monitoring method and system according to the embodiments of the present application have at least the following beneficial effects:

[0041] In the embodiment of the present application, optical fiber codes are provided at different positions of the composite cable, and the optical fiber codes can be coded differently according to the sensed environmental changes. Based on this, by obtaining the real-time coding information and initial coding information of multiple optical fiber codes and comparing and analyzing the two, the wavelength offset of the optical fiber codes can be obtained. Further analyzing the wavelength offset of each optical fiber code, the offset difference between multiple optical fiber codes on the composite cable can also be obtained, so as to effectively identify the effects of temperature and stress on the changes in the line parameters of the composite cable according to the overall dynamic change characteristics of the composite cable, so as to independently obtain the temperature change under the influence of temperature and the stress analysis results under the influence of stress, thereby improving the accuracy of cable monitoring.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1 This is a schematic diagram of an application of a cable monitoring system disclosed in an embodiment of the present application;

[0045] Figure 2 A schematic cross-sectional view of a composite cable disclosed in an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of a physical coding structure of an optical fiber coding in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of the structure of an optical fiber segment in an embodiment of the present application;

[0048] Figure 5 Another structural schematic diagram of an optical fiber segment in an embodiment of the present application;

[0049] Figure 6 This is a schematic diagram of a processing system in an embodiment of the present application;

[0050] Figure 7 A schematic diagram of a process flow of a cable monitoring method disclosed in an embodiment of the present application;

[0051] Figure 8 This is a schematic diagram of the specific process of step S740 in the embodiment of the present application.

[0052] Reference numerals:

[0053] The conducting part 110 , the protective tube 120 , the optical fiber segment 130 , the carbon fiber protective layer 131 , the shrink coating 132 , the low temperature sensitivity factor 133 , the optical fiber coding 140 , the optical fiber grating 141 , the joint part 150 , the fiber jumper segment 160 , the identification device 200 and the tower 300 . DETAILED DESCRIPTION

[0054] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no special meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0056] This application provides a cable monitoring method, which can be applied to a cable monitoring system. Figure 1 , Figure 1 Schematic diagram of the structure of a cable monitoring system disclosed in an embodiment of the present application. Figure 1 As shown, the cable monitoring system includes a composite cable and an identification device 200. The composite cable includes a conductive part 110, a protective tube 120 and an optical fiber segment 130. The optical fiber segment 130 is provided with at least one optical fiber code 140. The optical fiber segment 130 is in contact with the conductive part 110 and is arranged between the protective tube 120 and the conductive part 110. The optical fiber code 140 can change its code according to the sensed environmental changes. The identification device 200 is connected to the composite cable to identify the optical fiber code 140.

[0057] like Figure 3 As shown, in one implementation, the fiber coding 140 may include a plurality of fiber gratings 141 of different wavelengths, and the plurality of fiber gratings 141 are arranged at intervals to form identification information, and each fiber coding 140 adopts a different grating structure and combination method. When the light wave irradiates the fiber coding 140, the fiber coding 140 will reflect the light wave combination sequence of the corresponding wavelength to form the coding information, so as to present special reflection and spectral characteristics in the environment of the intelligent composite cable. Among them, the fiber grating 141 can specifically adopt a reflective fiber grating 141 or a transmissive fiber grating 141, etc., without limitation. It can be understood that different fiber codes 140 are arranged on the fiber segment 130 at a certain interval, that is, they are respectively located at different fiber positions on the fiber segment 130, so that each fiber coding 140 is distinguished from each other, so as to realize the unique identification of the fiber position.

[0058] Optionally, the wavelength interval between different fiber gratings 141 in the fiber coding 140 is ≥ 0.75 nanometers, which can ignore the similar changes in the wavelength values ​​of each fiber coding 140 when the same fiber segment 130 is in a similar temperature and stress change environment, thereby improving the stability of wavelength identification. Specifically, the above wavelength interval can be 1 nanometer, 1.5 nanometers or 2 nanometers. For example, if the fiber codes 140 collected for the composite cable indoors are B1201, B1202 and B1203, respectively, after the composite cable is laid in the outdoor environment, the fiber codes 140 collected for the composite cable become b1201, b1202 and b1203, so the wavelength differences of each fiber coding 140 are obtained as b1201-B1201, b1202-B1202, b1202-B1202, respectively. If each wavelength difference is smaller than the wavelength interval, it means that the wavelength difference is within a reasonable and controllable range of variation, and the optical fiber code 140 after laying can be synchronously recorded as B1201, B1202 and B1203.

[0059] In other implementations, the fiber coding 140 may also be composed of coding elements with other optical characteristics. For example, the fiber coding 140 includes multiple reflective surfaces that are replicated on the fiber segment 130 using a laser, and the multiple reflective surfaces have multiple replication depths and mutual spacing, and the reflective surfaces with the same replication depth also have the same reflectivity. When a light wave enters a single reflective surface, the reflective surface will reflect a certain amount of reflected light. By calculating the reflected energy and the light collection time, the identification parameters of the reflective surface can be formed, and the identification parameters of the multiple reflective surfaces together form the coding information of the fiber coding 140.

[0060] In this embodiment, the conductive part 110 may be made of conductive materials such as metals that have temperature and stress conduction effects, and the protective tube 120 may be a round tube made of copper or aluminum. Optionally, the conductive part 110 includes mutually twisted metal wires, so that when the composite cable is cabled, a contraction process is adopted, and the twisted metal wires are used to fix and protect the protective tube 120 and the optical fiber segment 130.

[0061] In this embodiment, the identification device 200 is used to send light waves to the composite cable, and then perform photoelectric conversion, sampling and analysis based on the light waves reflected from the composite cable to obtain the wavelength value, energy and distance and other encoding information of each optical fiber code 140. Specifically, the identification device 200 includes at least a light source module and a photodetector. The light source module can use a narrow-band light source or other laser, and the photodetector can use an avalanche photodiode with a signal amplification effect.

[0062] It can be seen that, by using the cable monitoring system of the embodiment of the present application, the optical fiber code 140 on the optical fiber segment 130 can directly contact the conducting part 110, receive the conduction of the external temperature and stress by the conducting part 110, and thus change the code according to the sensed environmental changes, thereby achieving a more accurate dynamic perception effect, and at the same time, the protective tube 120 and the conducting part also play a protective role for the optical fiber segment 130. Based on this, the identification device 200 further monitors the various parameters of the entire composite cable line in real time by identifying the changes in the optical fiber code 140 of each optical fiber segment 130, which is conducive to further improving the accuracy of cable monitoring.

[0063] In some optional embodiments, such as Figure 4 As shown, a carbon fiber protective layer 131 is provided on the optical fiber segment 130. The carbon fiber protective layer 131 can protect the optical fiber segment 130 which is not subjected to stress, which is beneficial to prolonging the service life of the optical fiber, and can also maintain insulation while having temperature and stress conductivity, thereby reducing voltage and electromagnetic interference.

[0064] Optional, in actual processing, you can use Figure 6 The processing system shown in Figure 1 is as follows. Figure 6As shown, a high-temperature heating groove 610, a diameter stopper 620 and a cooling groove 630 are sequentially arranged between the two rollers 600, and two carbon fiber injection holes 611 are arranged on both sides of the high-temperature heating groove 610. When the two rollers 600 rotate clockwise, the optical fiber segment 130 is driven to enter the high-temperature heating groove 610, and the high-temperature heating groove 610 heats the optical fiber segment 130 so that the outer coating of the optical fiber segment 130 is softened and has a covering ability, and at the same time, the carbon fiber is sprayed out from the carbon fiber injection hole 611. As the optical fiber segment 130 moves, the sprayed carbon fiber can be evenly coated on the outer coating of the optical fiber segment 130. Afterwards, the optical fiber segment 130 covered with carbon fiber is squeezed to a specified diameter when passing through the diameter stopper 620, and then subjected to a cooling treatment in the cooling groove 630, the processing of the carbon fiber protective layer 131 is completed. Compared with the traditional process of using glue to bond and fix the optical fiber and the carbon fiber, this method does not change the temperature-sensitive characteristics of the optical fiber encoding 140, and the effect is better.

[0065] In some optional embodiments, such as Figure 5 As shown, the optical fiber code 140 is provided with a shrink coating 132, and the shrinkage rate of the shrink coating 132 is 1×10 -6 K to 3×10 -6 K, the optical fiber segment 130 includes a low temperature sensitive factor 133. By adding the shrink coating 132 and infiltrating the low temperature sensitive factor 133 into the optical fiber, the temperature sensitivity of the optical fiber code 140 can be effectively reduced, and the monitoring error caused by the temperature sensitivity of the optical fiber code 140 being greater than the stress sensitivity can be reduced.

[0066] In some optional implementations, the spatial interval L between different fiber codes 140 satisfies: L>(f*c) / (n*2), where f is the light pulse time of the identification device 200, c is the speed of light, and n is the group refractive index of the fiber segment 130, which can ensure the correlation between the spatial interval of the fiber code 140 and the spatial sampling accuracy of the identification device 200.

[0067] In other optional implementations, the spatial interval between different optical fiber codes 140 can be set to 10 meters to 50 meters to match the actual cable setting requirements, while ensuring the amount of data collected and avoiding increased identification difficulty due to too many optical fiber codes 140.

[0068] In some optional embodiments, the number of composite cables is at least two, and two adjacent composite cables are connected by a joint part 150, and the joint part 150 is arranged at the pole tower 300, and the joint part 150 is provided with an optical fiber code 140. Specifically, the joint part 150 may include a joint box and a series section of the optical fiber, and the series section is arranged in the joint box, so the joint box plays a protective role for the series section. The two ends of the series section are respectively connected to different optical fiber segments 130, and the series section is provided with an optical fiber code 140, so that the connection of the optical fiber code 140 in the entire cable line is realized. In addition, since the joint part 150 has the characteristics of being observable by human eyes and geographical positioning, by collecting the geographical location data of the laying path (including the pole tower 300, the pipe well and other laying path points, etc.) of the composite cable between the joint parts 150 (or between the joint part 150 and the identification device 200), it is possible to combine multiple information such as optical fiber positioning, optical fiber sensing, optical fiber coding 140 and geographical positioning on the entire cable line, so as to facilitate the rapid positioning of the specific optical fiber position according to the cable monitoring results.

[0069] In some optional embodiments, the composite cable further includes a fiber jumper segment 160 disposed indoors, and the fiber jumper segment 160 may also be provided with an optical fiber code 140, and the identification device 200 is connected to the optical fiber segment 130 via the fiber jumper segment 160. Since the temperature in the indoor environment is relatively constant and there is no stress interference, the optical fiber code 140 of the fiber jumper segment 160 may be in a wavelength-stable state, and therefore the optical fiber code 140 identified for the fiber jumper segment 160 may be used as a wavelength fluctuation reference value of each optical fiber code 140 in the outdoor environment, which plays a certain calibration role.

[0070] A cable monitoring method disclosed in an embodiment of the present application is described in detail below.

[0071] like Figure 7 As shown, Figure 7 Schematic diagram of a cable monitoring method disclosed in an embodiment of the present application. Figure 7 As shown, the method comprises the following steps:

[0072] Step S700: Acquire coding change information, where the coding change information includes real-time coding information of multiple optical fiber codes.

[0073] In the embodiment of the present application, the real-time coding information of multiple optical fiber codes on the composite cable can be obtained by the identification device. The real-time coding information includes but is not limited to: the real-time coding of the optical fiber code, the real-time energy and the real-time distance between the optical fiber code and the identification device.

[0074] Step S710: Acquire initial coding information of each optical fiber code, and compare and analyze the initial coding information with the real-time coding information to obtain the wavelength offset of the optical fiber code.

[0075] In the embodiment of the present application, the initial coding information may be the coding information collected by the identification device on the composite cable when the composite cable is laid, specifically including the initial coding of the fiber coding, the initial energy, and the initial distance between the fiber coding and the identification device. Then, the wavelength offset of the fiber coding = the real-time coding of the fiber coding - the initial coding of the fiber coding. Optionally, if the fiber coding includes multiple fiber gratings (or coding elements), the difference between the initial coding and the real-time coding of each fiber grating (or coding element) in the fiber coding can be averaged to obtain the wavelength offset.

[0076] Exemplarily, assuming that the initial coding of the fiber coding includes the initial coding of 4 coding elements B1201001, B1201002, B1201003 and B1201004, and the real-time coding includes the real-time coding of 4 coding elements b1201001, b1201002, b1201003 and b1201004, the wavelength offset p of the fiber coding is:

[0077] p=((b1201001-B1201001)+(b1201002-B1201002)+(b1201003-B1201003)+(b1201004-B1201004))÷4.

[0078] In some optional implementations, after generating the initial coding information, the original coding information can also be obtained. The original coding information is the coding information collected from the composite cable when the composite cable is connected to the identification device in an indoor environment, specifically including the original coding and original energy of the optical fiber coding. According to the original coding and initial coding of each optical fiber coding, the initial tension value and initial temperature value of each optical fiber coding can be calculated. According to the initial tension value of each optical fiber coding, the tension curve of the composite cable can also be generated. In combination with the initial tension value of each optical fiber coding and the position information (such as obtained by locating the adjacent towers through a geographic information system) and height information of the adjacent towers connected to the composite cable, the initial tower height difference between the initial sag bottom of the composite cable and the adjacent towers, the initial height of the initial sag bottom, the initial position of the initial sag bottom, and the initial height of each adjacent tower can also be calculated.

[0079] Step S720: Determine the offset difference between the multiple fiber codes according to the wavelength offset of each fiber code.

[0080] Among them, the method of determining the offset difference between multiple fiber codes includes but is not limited to any of the following: taking the minimum offset and the minimum offset from the wavelength offsets of multiple fiber codes, and then calculating the difference between the maximum offset and the minimum offset as the offset difference; or, performing variance calculation on the wavelength offsets of multiple fiber codes to obtain the offset difference.

[0081] Step S730: If the offset difference does not exceed the preset offset, it is determined that there is a temperature change in the composite cable, and a target temperature value of the composite cable is calculated.

[0082] The preset offset can be measured through experiments and manually set and adjusted. For example, the preset offset is 0.06 nm, and there is no limit to this.

[0083] In one implementation, when the number of composite cables is at least two, the two ends of each composite cable will be connected to different pole towers respectively, and when the pole tower is connected to the composite cable through at least two pull wires, the multiple fiber codes include the fiber code between the pull wires. Based on this, the target temperature value of the composite cable can be calculated according to the fiber code between the pull wires and its corresponding initial temperature value, that is: target temperature value = (fiber code between the pull wires ÷ first conversion parameter) + initial temperature value. Among them, the first conversion parameter is used to represent the conversion relationship between wavelength and temperature, and is set manually. For example, the first conversion parameter is 0.09nm / ℃, which is not limited. It can be seen that the length of the cable segment between the pull wires and the stress interference it receives are both small, and it is not easy to form dancing. Therefore, the temperature calculation based on the fiber code between the pull wires has good stability.

[0084] It can be understood that the above-mentioned method of calculating the temperature value of the optical fiber coding between the pulling lines can be applied to any other optical fiber coding and will not be described in detail.

[0085] In another implementation, the minimum offset can be taken from the wavelength offsets of multiple fiber codes, and the initial temperature value of the fiber code corresponding to the minimum offset can be obtained, so as to calculate the target temperature value of the fiber code according to the minimum offset and the corresponding initial temperature value, that is, target temperature value = (minimum offset ÷ first conversion parameter) + initial temperature value. It can be seen that when the wavelength offset of the fiber code is the smallest, the stress interference of the fiber code is also the smallest, so the temperature calculation based on the minimum offset can also reflect the temperature change more accurately.

[0086] Step S740: If the offset difference exceeds the preset offset, it is determined that there is stress change in the composite cable, and stress analysis is performed on the composite cable according to the wavelength offset of each optical fiber code to obtain a stress analysis result.

[0087] In some optional implementations, after determining that there is stress change in the composite cable, the minimum offset can be subtracted from the wavelength offset of each fiber code according to the minimum offset among the wavelength offsets of multiple fiber codes to obtain a new wavelength offset. Afterwards, stress analysis is performed on the composite cable according to the new wavelength offsets of each fiber code to obtain a stress analysis result. It can be seen that since the fiber code with the smallest wavelength offset is subjected to the smallest stress interference, the wavelength offset caused by temperature change can be subtracted based on the minimum offset, thereby improving the accuracy of stress analysis.

[0088] It can be understood that when the offset difference is small, the temperature change is determined, and when the offset is large, the stress change is determined, which is consistent with the characteristic that the temperature sensitivity of optical fiber coding is greater than the stress sensitivity. Therefore, setting a preset offset can realize the separation and calculation of conduction properties in complex environments based on quantitative data thresholds.

[0089] In an optional implementation, one end of the composite cable is connected to the first pole tower, and the other end of the composite cable is connected to the second pole tower, and the coding change information also includes the wavelength change time of the multiple optical fiber codes. Figure 8 , Figure 8 Schematic diagram of the specific process of step S740 in the embodiment of the present application. Figure 8 As shown, step S740 is specifically as follows:

[0090] Step S741: If the offset difference exceeds a preset offset, it is determined that stress changes exist in the composite cable.

[0091] Step S742: Determine whether the wavelength change time exceeds the preset change time. If not, execute step S743; if yes, execute step S744.

[0092] The preset change time can be measured through experiments and manually set and adjusted. For example, the preset change time is 60 seconds, and there is no limitation on this.

[0093] Step S743: if it is determined that the composite cable is dancing, the dancing direction of the composite cable is determined and the dancing amplitude of the composite cable is calculated according to the wavelength offset of each optical fiber code.

[0094] In some implementations, determining the dancing direction of the composite cable based on the wavelength offsets encoded by each optical fiber may include:

[0095] According to the wavelength offset of each fiber code, the wavelength change trend of the fiber code is determined, and all fiber codes are traversed according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower. In other words, if the geographical distance between the first tower and the identification device is less than the geographical distance between the second tower and the identification device, when the fiber codes are traversed in sequence according to the extension direction, the real-time distances of these fiber codes will increase in sequence. Specifically, if the wavelength offset is greater than 0, the wavelength change trend is determined to be increasing, and if the wavelength offset is less than 0, the wavelength change trend is determined to be decreasing.

[0096] Based on this, if the wavelength change trend of each fiber optic code is synchronously increased, the side wind direction is determined as the dancing direction of the composite cable, and the side wind direction is at a certain angle to the extension direction. If during the traversal process, the fiber optic code with an increasing wavelength change trend is first traversed, and then the fiber optic code with a decreasing wavelength change trend is traversed, the extension direction is determined as the dancing direction of the composite cable. If during the traversal process, the fiber optic code with a decreasing wavelength change trend is first traversed, and then the fiber optic code with an increasing wavelength change trend is traversed, the direction opposite to the extension direction is determined as the dancing direction of the composite cable.

[0097] It can be seen that based on the wavelength change law of the composite cable, the specific cable dancing direction can be determined, the cable wind dance dynamic data can be constructed, and the actual wind conditions of the cable laying environment can be analyzed, which is convenient for making rapid warnings and precise response measures.

[0098] In some implementations, the geographical distance difference between the first tower and the second tower may be obtained according to the location information of the first tower and the second tower. Then, calculating the galloping amplitude of the composite cable may include the following steps:

[0099] First, the fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively.

[0100] Afterwards, the current tension value of the optical fiber coding is calculated according to the wavelength offset of each optical fiber coding. The current tension value can be calculated as follows: the current tension value of the optical fiber coding = wavelength offset × 10 t (t is the second conversion coefficient, used to indicate the conversion relationship between tension and wavelength), and other manually set tension value calculation formulas may also be used without limitation. Optionally, the tension curve of the composite cable may also be updated according to the current tension values ​​encoded by each optical fiber.

[0101] Then, according to the current tension values ​​of the first code, the second code, and the third code, combined with the geographical distance difference, the current height and current position of the current sag bottom are calculated. Specifically, the first height difference h1 between the current sag bottom and the first tower can be calculated according to the current tension value F1 of the first code and the current tension value F2 of the second code, that is: h1 = (F2-F1) 2 ÷(8×a), a is the cable self-weight factor. According to the first coded tension value F1 and the third coded tension value F3, calculate the second height difference h2 between the current sag bottom and the second tower, that is: h2=(F3-F1) 2 ÷(8×a). Then, according to the initial height H1 of the first tower, the initial height H2 of the second tower, the first height difference h1 and the second height difference h2, the current height H0 and the current position L0 of the current sag bottom are calculated. That is, the current height H0=H1-h1 (or H0=H2-h2), the current position L0 represents the straight-line distance between the current sag bottom and the first tower, and the current position L0=the geographical distance difference between the first tower and the second tower÷(real-time distance of the third code-real-time distance of the second code)×(real-time distance of the first code-real-time distance of the second code).

[0102] Finally, the dancing amplitude of the composite cable is determined according to the current height and current position of the current sag bottom. That is, the current height and current position of the current sag bottom are respectively compared with the initial height and initial position of the initial sag bottom to obtain the dancing amplitude, so as to restore the wind dance change form of the composite cable. It can be understood that the above method of calculating the current height and current position of the current sag bottom is also applicable to the fiber position of other fiber codes.

[0103] Step S744: if it is determined that there is tower settlement, a target tower that has settled is determined from the first tower and the second tower according to the wavelength offset of each optical fiber code, and the settlement height of the target tower is calculated.

[0104] In some implementations, determining the target tower where settlement has occurred may specifically include the following steps: determining the wavelength variation trend of the optical fiber code according to the wavelength offset of each optical fiber code, and traversing all optical fiber codes according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower.

[0105] If, during the traversal process, the optical fiber code with a decreasing wavelength variation trend is first traversed, and then the optical fiber code with an increasing wavelength variation trend is traversed, the first pole tower is determined as the target pole tower that has subsided. If, during the traversal process, the optical fiber code with an increasing wavelength variation trend is first traversed, and then the optical fiber code with a decreasing wavelength variation trend is traversed, the second pole tower is determined as the target pole tower that has subsided. It can be seen that based on the wavelength variation law of the composite cable, the specific pole tower that has subsided can be quickly located.

[0106] In some implementations, calculating the settlement height of the target tower may specifically include the following steps:

[0107] First, the fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively.

[0108] Afterwards, the initial tower height difference between the first tower and the second tower is obtained, and the current tower height difference is determined according to the real-time coding information corresponding to the first coding, the second coding and the third coding, that is, the current tower height difference = |first height difference h1 - second height difference h2|.

[0109] Finally, the settlement height of the target tower is obtained according to the difference between the initial tower height difference and the current tower height difference.

[0110] Further, in some optional implementations, after comparing and analyzing the initial coding information with the real-time coding information, at least the following situations may be included, thereby effectively identifying the fiber interruption, line loss and temperature abnormality on the entire cable line, facilitating rapid location of abnormalities and alarm processing, specifically:

[0111] In one case, if the initial coding information includes a fiber code that does not appear in the real-time coding information, the fiber code that does not appear in the real-time coding information is taken as the fourth code, and the interruption position corresponding to the fourth code is determined according to the real-time distance of the fourth code. Specifically, the interruption position represents the surface straight-line distance between the fourth code and the first tower, that is, the interruption position = the geographical location difference between the first tower and the second tower ÷ (real-time distance of the third code - real-time distance of the second code) × (real-time distance of the fourth code - real-time distance of the second code).

[0112] Or, in another case, if there is a fifth code, the attenuation segment position corresponding to the fifth code is determined according to the real-time distance of the fifth code, and the fifth code satisfies: the difference between the real-time energy of the fifth code and the initial energy exceeds the preset energy value, and the preset energy value is set manually, such as the preset energy value is 1.2db, which is not limited. Specifically, the attenuation segment position represents the straight-line distance on the surface between the fifth code and the first tower, that is, the attenuation segment position = the geographical location difference between the first tower and the second tower ÷ (real-time distance of the third code - real-time distance of the second code) × (real-time distance of the fifth code - real-time distance of the second code).

[0113] Alternatively, in another case, if the sixth code exists, the sixth code satisfies: among multiple optical fiber codes, the difference between the wavelength offset of the sixth code and the wavelength offset of other optical fiber codes exceeds the preset difference, then the temperature anomaly position corresponding to the sixth code is determined according to the real-time distance of the sixth code, that is, the temperature anomaly position = the geographical location difference between the first tower and the second tower ÷ (real-time distance of the third code - real-time distance of the second code) × (real-time distance of the sixth code - real-time distance of the second code).

[0114] It can be seen that the implementation of the above method embodiment can effectively identify the effects of temperature and stress on the changes in composite cable line parameters based on the overall dynamic change characteristics of the composite cable, so as to independently obtain the temperature changes under the influence of temperature and the stress analysis results under the influence of stress, thereby improving the accuracy of cable monitoring.

[0115] An embodiment of the present application further provides an electronic device, which includes a memory and a processor. The memory stores a program, and when the program is executed by the processor, the above-mentioned cable monitoring method is implemented.

[0116] An embodiment of the present application also provides a storage medium for computer-readable storage, wherein the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the above-mentioned cable monitoring method.

[0117] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0118] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0119] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. A cable monitoring method, characterized in that: The method comprises: Acquiring coding change information, the coding change information including real-time coding information of a plurality of optical fiber codes, the optical fiber codes being arranged at different positions on the composite cable, the optical fiber codes being used to change coding according to sensed environmental changes; Acquire initial coding information of each of the optical fiber codes, and compare and analyze the initial coding information with the real-time coding information to obtain the wavelength offset of the optical fiber code; Determining the offset difference between the plurality of optical fiber codes according to the wavelength offset of each optical fiber code; If the offset difference does not exceed the preset offset, determining that the composite cable has a temperature change, and calculating a target temperature value of the composite cable; If the offset difference exceeds the preset offset, it is determined that there is a stress change in the composite cable, and a stress analysis is performed on the composite cable according to the wavelength offsets of each optical fiber code to obtain a stress analysis result; One end of the composite cable is connected to a first pole tower, and the other end of the composite cable is connected to a second pole tower. The coding change information also includes wavelength change times of a plurality of the optical fiber codes. The stress analysis of the composite cable is performed according to the wavelength offset of each of the optical fiber codes to obtain a stress analysis result, including: Determining whether the wavelength change time exceeds a preset change time; If the wavelength change time does not exceed the preset change time, it is determined that the composite cable is dancing, and the dancing direction of the composite cable is determined and the dancing amplitude of the composite cable is calculated according to the wavelength offset of each optical fiber code; If the wavelength change time exceeds the preset change time, it is determined that the tower has sunk, then according to the wavelength offsets of the optical fiber codes, a target tower that has sunk is determined from the first tower and the second tower, and the sunk height of the target tower is calculated.

2. The method according to claim 1, characterized in that Determining the dancing direction of the composite cable according to the wavelength offset of each optical fiber encoding includes: Determine the wavelength variation trend of the optical fiber code according to the wavelength offset of each optical fiber code, and traverse all the optical fiber codes according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower; If the wavelength variation trend of each of the optical fiber codes increases synchronously, the side wind direction is determined as the dancing direction of the composite cable, and the side wind direction forms a certain angle with the extension direction; If, during the traversal process, the optical fiber code with an increasing wavelength variation trend is traversed first, and then the optical fiber code with a decreasing wavelength variation trend is traversed, the extending direction is determined as the dancing direction of the composite cable; If during the traversal process, the optical fiber code with a decreasing wavelength variation trend is traversed first, and then the optical fiber code with an increasing wavelength variation trend is traversed, the direction opposite to the extending direction is determined as the dancing direction of the composite cable.

3. The method according to claim 1, characterized in that The method further comprises: Obtaining a geographical distance difference between the first tower and the second tower; The calculating the dancing amplitude of the composite cable comprises: The optical fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two optical fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively; Calculating the current tension value of the optical fiber code according to the wavelength offset of each optical fiber code; Calculate the current height and current position of the current sag bottom according to the current tension values ​​of the first code, the second code, and the third code, combined with the geographical distance difference; The galloping amplitude of the composite cable is determined according to the current height and the current position of the current sag bottom.

4. The method according to claim 1, characterized in that: The step of determining a target pole tower that has sunk from among the first pole tower and the second pole tower according to the wavelength offsets of the optical fiber codes comprises: Determine the wavelength variation trend of the optical fiber code according to the wavelength offset of each optical fiber code, and traverse all the optical fiber codes according to the extension direction of the composite cable, wherein the extension direction is the direction from the first tower along the composite cable to the second tower; If, during the traversal process, the optical fiber code with a decreasing wavelength variation trend is traversed first, and the optical fiber code with an increasing wavelength variation trend is traversed later, the first pole tower is determined as the target pole tower with settlement; If, during the traversal process, the optical fiber code with an increasing wavelength variation trend is traversed first, and the optical fiber code with a decreasing wavelength variation trend is traversed later, the second pole tower is determined as the target pole tower that has subsided.

5. The method according to claim 2, characterized in that: The calculating the settlement height of the target tower comprises: The optical fiber code with the smallest wavelength offset is taken as the first code corresponding to the current sag bottom, and the two optical fiber codes with the largest wavelength offsets are taken as the second code corresponding to the first tower and the third code corresponding to the second tower respectively; Obtaining an initial tower height difference between the first tower and the second tower; Determine a current tower height difference between the first tower and the second tower according to real-time coding information corresponding to the first coding, the second coding, and the third coding respectively; The settlement height of the target tower is obtained according to the difference between the initial tower height difference and the current tower height difference.

6. The method according to any one of claims 1 to 5, characterized in that: After determining that the composite cable has stress changes, and before performing stress analysis on the composite cable according to the wavelength offsets of the optical fiber codes to obtain stress analysis results, the method further includes: determining a minimum offset among the wavelength offsets of the optical fiber codes; The minimum offset is subtracted from the wavelength offset of the optical fiber code to obtain a new wavelength offset.

7. The method according to any one of claims 1 to 5, characterized in that: The real-time coding information also includes the real-time energy and real-time distance of the optical fiber coding, and the initial coding information also includes the initial energy of the optical fiber coding; after comparing and analyzing the initial coding information with the real-time coding information, the method further includes: If the initial coding information includes a fiber code that does not appear in the real-time coding information, taking the fiber code that does not appear in the real-time coding information as the fourth code, and determining the interruption position corresponding to the fourth code according to the real-time distance of the fourth code; Alternatively, if there is a fifth code, the attenuation segment position corresponding to the fifth code is determined according to the real-time distance of the fifth code, and the fifth code satisfies: the difference between the real-time energy of the fifth code and the initial energy exceeds a preset energy value.

8. A cable monitoring system, which implements the method according to any one of claims 1 to 5, characterized in that: include: A composite cable, comprising a conducting part, a protective tube and an optical fiber segment; the optical fiber segment is provided with at least one optical fiber code, the optical fiber segment is in contact with the conducting part and the optical fiber segment is arranged between the protective tube and the conducting part, and the optical fiber code can change in code according to a sensed environmental change; An identification device is connected to the composite cable to monitor the optical fiber coding.

9. The cable monitoring system according to claim 8, characterized in that: The conductive portion includes metal wires twisted together.

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