Optical cable burial depth detection system

Abstract

The invention relates to the technical field of optical fiber sensing, in particular to an optical cable burial depth detection system. The system comprises a phase-sensitive optical time domain reflection device which is connected to a to-be-measured optical cable and is used for collecting first vibration data according to a collection instruction, adding time information into the first vibration data and uploading the first vibration data to a background processing module; the vibration acquisition equipment is used for acquiring second vibration data according to the acquisition instruction, adding time information into the second vibration data and uploading the second vibration data to the background processing module; the background processing module is used for generating an acquisition instruction and respectively issuing the acquisition instruction to the phase-sensitive optical time domain reflection equipment and the vibration acquisition equipment; and the processor is used for receiving the first vibration data and the second vibration data, aligning the first vibration data and the second vibration data according to the time information, and obtaining the burial depth of the to-be-measured optical cable according to the aligned first vibration data and second vibration data. The system can realize simple, rapid and accurate measurement of the burial depth of the optical cable.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber sensing technology, and more specifically, to an optical cable buried depth detection system. Background Art

[0002] As an important part of modern communication technology, optical cables have long been an indispensable tool in the construction of information infrastructure. However, due to historical reasons and early technical problems, the specific burial depth of each section of optical cables was not recorded in detail when the optical cables were laid in the early days. In addition, with the passage of time and the influence of natural environmental factors such as rain erosion, the actual location of many optical cables has shifted, making it difficult to determine the buried depth of the optical cables. This situation poses a significant challenge when troubleshooting optical cable faults; furthermore, since the buried depth of the optical cable cannot be accurately determined, it also brings significant inconvenience to other construction activities: in the absence of accurate buried depth information, there is a risk of accidental damage to the optical cable, so manual careful excavation has to be adopted to avoid such accidents. This method is not only time-consuming but also labor-intensive. Therefore, monitoring the precise buried depth of optical cables has become one of the key steps in the field of optical cables.

[0003] At present, there are certain limitations in the optical cable burial depth detection system. The traditional detection system uses a single optical cable burial depth detection method, which is difficult to adapt to the changing detection environment. In addition, some optical cable burial depth detection methods are costly and inefficient, and the background data processing is complex. The technical requirements of the detection personnel are high, and it is impossible to achieve simple and accurate detection of optical cables. Therefore, it is necessary to make necessary improvements to the optical cable burial depth detection system. Summary of the invention

[0004] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide an optical cable buried depth detection system to achieve simple, fast and accurate measurement of the buried depth of the optical cable.

[0005] According to a first aspect of the present application, a system for detecting buried depth of optical cable is provided, and the system specifically comprises:

[0006] A phase-sensitive optical time-domain reflectometry device, the phase-sensitive optical time-domain reflectometry device is connected to the optical cable to be tested, and is used to collect first vibration data formed by the detection vibration in the optical cable to be tested according to the received collection instruction, and after adding time information to the first vibration data, upload the first vibration data to the background processing module; wherein the detection vibration is generated by applying at a vibration applying position, and the vibration applying position is determined according to the optical cable route of the optical cable to be tested and is located directly above the optical cable route;

[0007] A vibration collection device, used for collecting second vibration data formed on the ground by the detection vibration according to the received collection instruction, and uploading the second vibration data to the background processing module after adding time information to the second vibration data;

[0008] The background processing module is used to generate the acquisition instruction and send the acquisition instruction to the phase-sensitive optical time domain reflection device and the vibration acquisition device respectively; and is also used to receive the uploaded first vibration data and the second vibration data, align the first vibration data and the second vibration data according to the time information, and obtain the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data.

[0009] It can be understood that in the present invention, the detected vibration is collected by a phase-sensitive optical time-domain reflection device and a vibration collection device, and the collected vibration data is uploaded to the background processing module for processing. The buried depth of the optical cable to be tested is obtained according to the processed data, which can realize simple, fast and accurate measurement of the buried depth of the optical cable.

[0010] Optionally, the acquisition instruction includes a countdown duration, and the countdown duration is set at a plurality of time points at the same time interval;

[0011] The phase-sensitive optical time-domain reflectometry device uploads the first vibration data to the background processing module once at one time point; the background processing module generates a first vibration real-time waveform image according to the first vibration data;

[0012] The vibration collection device uploads the second vibration data to the background processing module once at a time point, and the background processing module generates a second vibration real-time waveform image according to the second vibration data;

[0013] After the countdown time is completed, the background processing module pre-processes and aligns all the first vibration data and the second vibration data received to generate an integrated waveform image.

[0014] It is understandable that the phase-sensitive optical time-domain reflectometer and the vibration acquisition device can upload vibration data according to the countdown instruction, and the background processing module generates a waveform image from the vibration data, thereby realizing the division of labor among various devices and modules and making data processing clear and organized.

[0015] Optionally, preprocessing and aligning all the received first vibration data and the second vibration data to generate an integrated waveform image specifically includes:

[0016] Perform frame loss detection and supplementation processing on all the first vibration data received to generate a first waveform image;

[0017] Perform frame loss detection, supplementation processing, and filtering processing on all the received second vibration data to generate a second waveform image;

[0018] The first waveform image and the second waveform image are aligned according to time information to generate an integrated waveform image.

[0019] Optionally, the frame loss detection, supplementary processing and filtering processing of the vibration data can solve the correspondence problem between the waveform image time and image generated by the vibration data, provide accurate original data for the subsequent operation of aligning the waveform images, and reduce the interference of other irrelevant data; the integrated waveform image provides key calculation materials for the entire optical cable buried depth detection; the phase-sensitive optical time domain reflection device collects the first vibration data and the vibration collection device collects the second vibration data separately, and the collected first vibration data and the second vibration data need to be placed on the same time axis for alignment to have comparison significance, so the first vibration data and the second vibration data need to be aligned according to the time information.

[0020] Optionally, the vibration collection device and the vibration applying position are arranged at the same ground position.

[0021] It can be understood that the vibration collection device and the vibration application position are set at the same ground position, that is, the vibration is immediately collected by the vibration collection device after it is applied, without any distance deviation, and the vibration is simultaneously transmitted downward to the optical cable to be tested. The burial depth of the optical cable to be tested can be measured based on the time difference, and there is no need for large-scale excavation to measure the burial depth, which has a convenient and efficient measurement effect.

[0022] Optionally, obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data specifically includes:

[0023] The peak difference between the aligned first vibration data and the second vibration data is obtained, and the peak difference distance is calculated by a velocity formula, and the peak difference distance is used as the buried depth of the optical cable to be tested.

[0024] It is understandable that, by adopting the method of setting the vibration collection device and the vibration application position at the same ground position, the burial depth of the optical cable to be tested is calculated by the average peak difference between the first vibration data and the second vibration data. This method can omit the measurement on the ground and directly obtain the burial depth based on the mathematical formula.

[0025] Optionally, the vibration collection device is arranged at a ground position at a certain horizontal distance from the vibration applying position.

[0026] It can be understood that the vibration collection device is set at a ground position at a certain horizontal distance from the vibration application position, and can compare the buried depth of the optical cable to be measured with the horizontal distance between the vibration collection device and the vibration application position, and transfer the buried depth of the optical cable to be measured to the measurement of the horizontal distance on the ground. There is no need for large-scale excavation to measure the buried depth, thereby achieving a convenient and efficient measurement effect.

[0027] Optionally, obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data specifically includes:

[0028] If the start time points of the first vibration data and the second vibration data after alignment coincide, the horizontal distance between the vibration collection device and the vibration application position is used as the buried depth of the optical cable to be tested;

[0029] If the starting time points of the first vibration data and the second vibration data after alignment do not coincide, the horizontal distance between the vibration acquisition device and the vibration application position is adjusted, and the detection vibration is reapplied until a certain horizontal distance is found so that the first vibration data and the second vibration data coincide with the starting time point corresponding to the re-application of the detection vibration.

[0030] It is understandable that adjusting the horizontal distance according to the starting time point can determine the adjustment of the horizontal distance only based on the comparison of the two vibration data images, which has certain convenience and efficiency. According to the first vibration data and the second vibration data after the time information is aligned, the time point of receiving the detection vibration is the same. Under the assumption that the vibration propagation speed is the same, the starting time points coincide, indicating that the vertical distance of the detection vibration transmitted from the vibration application position to the optical cable to be measured is the same as the horizontal distance transmitted from the detection vibration application position to the position of the vibration collection device. Then, the horizontal distance between the vibration collection device and the vibration application position can be directly used as the buried depth of the optical cable to be measured. The measurement steps are simple and accurate, which effectively improves the efficiency of the buried depth detection measurement of the optical cable to be measured; when the starting time points do not coincide, it is only necessary to adjust the horizontal distance between the setting position of the vibration collection device and the vibration application position, and re-apply the detection vibration, which is simple and convenient to operate.

[0031] Optionally, the adjusting the horizontal distance between the vibration collection device and the vibration applying position specifically includes:

[0032] Keeping the vibration applying position unchanged, moving the setting position of the vibration collecting device to increase or decrease the horizontal distance between the setting position of the vibration collecting device and the vibration applying position;

[0033] The straight line connecting the vibration applying position and the vibration collecting device is perpendicular to the optical cable routing direction.

[0034] It can be understood that one of the methods for adjusting the horizontal distance provided in the present application is to keep the vibration application position unchanged and move the setting position of the vibration collection device, so as to realize convenient adjustment of the horizontal distance; and limiting the straight line connecting the vibration application position and the vibration collection device to be perpendicular to the optical cable route, so as to improve the measurement accuracy.

[0035] Optionally, the adjusting the horizontal distance between the vibration collection device and the vibration applying position specifically includes:

[0036] Keeping the setting position of the vibration collection device unchanged, moving the vibration application position to increase or decrease the horizontal distance between the setting position of the vibration collection device and the vibration application position;

[0037] The moving track of the vibration application position is projected onto the route of the optical cable to be tested.

[0038] It can be understood that the present application provides another method for adjusting the horizontal distance, which is to keep the setting position of the vibration collection device unchanged and move the vibration application position, so as to achieve convenient adjustment of the horizontal distance; by limiting the moving trajectory of the vibration application position, the measurement process can be facilitated and the measurement accuracy can be improved.

[0039] It is understandable that to measure the buried depth of the optical cable to be measured, the horizontal distance between the setting position of the vibration collection device and the vibration application position can be adjusted, that is, the length of the horizontal distance can be increased or decreased, or the vibration application position and the vibration collection device can be directly placed in the same ground position. This can simplify the measurement process and provide a solution for a certain position in actual situations that cannot be moved due to terrain, equipment and other problems, thereby improving the flexibility of the detection system.

[0040] Optionally, the vibration application position is determined according to the optical cable route of the optical cable to be tested, specifically including:

[0041] Positioning vibrations are applied to several ground positions along a path intersecting with the optical cable route of the optical cable to be tested, and the vibration intensity of each positioning vibration is collected through the optical cable to be tested, and the positioning vibration with the largest vibration intensity is used as the vibration application position.

[0042] It is understandable that in the process of vibration propagation, as the vibration propagation distance continues to increase, the vibration intensity will continue to decay, and the positioning vibration with the maximum vibration intensity is detected on the optical cable to be tested, indicating that the straight-line distance between the ground position of the positioning vibration and the optical cable to be tested is the shortest, indicating that the ground position is located directly above the optical cable route. The positioning and determination of the vibration application position can be completed by connecting the phase-sensitive optical time domain reflection device of the optical cable to be tested without the need for additional equipment, and the operation is simple and convenient, which improves the detection efficiency and reduces the operating cost.

[0043] Optionally, the system further comprises:

[0044] The time information is generated by a time synchronization device; both the phase-sensitive optical time domain reflectometry device and the vibration collection device are equipped with the time synchronization device; the time synchronization device includes a GPS unit.

[0045] The time synchronization device is respectively configured on the phase-sensitive optical time-domain reflection device and the vibration collection device, and the time synchronization device generates corresponding time information respectively, so that the vibration collection device can run detection separately from the phase-sensitive optical time-domain reflection device, thereby reducing the data interaction process and improving the detection efficiency; the GPS unit has a simple structure and can effectively obtain the positioning time at the millisecond level, thereby reducing the cost of the equipment while ensuring the positioning accuracy; at the same time, the time information provided by the GPS can be used to identify the vibration data generated by the knocking of this application, thereby reducing the interference of noise data.

[0046] Based on any of the above aspects, an optical cable burial depth detection system provided in an embodiment of the present application can collect the first vibration data according to the received collection instruction by using a phase-sensitive optical time domain reflection device and upload it to the background processing module after adding time information, and at the same time use a vibration collection device to collect the second vibration data according to the received collection instruction and upload it to the background processing module after adding time information, and finally use the background processing module to receive the uploaded first vibration data and the second vibration data, align the first vibration data and the second vibration data according to the time information, so as to obtain the burial depth of the optical cable to be measured. The system provides a variety of methods for measuring the burial depth to be measured and the processing of background data, which can realize the rapid and accurate measurement of the burial depth of the optical cable, and does not need to estimate the propagation speed of vibration in different soil environments. It is easy to operate and cost-controlled, and can adapt to the measurement of the burial depth of optical cables in different environmental conditions, optimize the maintenance and repair process of optical cables, reduce operating costs, and meet increasingly stringent industry safety standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 This is a module diagram of the optical cable buried depth detection system provided in this embodiment.

[0049] Figure 2 A flowchart for generating a waveform image provided in this embodiment.

[0050] Figure 3 This is a flow chart of the integrated waveform image generation method provided in this embodiment.

[0051] Figure 4 A flow chart of the method for obtaining burial depth provided in this embodiment.

[0052] Figure 5 This is an integrated waveform image diagram provided in this embodiment.

[0053] Icon: phase-sensitive optical time-domain reflectometry device 11, vibration collection device 12, background processing module 13. DETAILED DESCRIPTION

[0054] The drawings of this application are only used for illustrative purposes and should not be construed as limiting the present application. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0055] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] This embodiment provides a technical solution that can solve the above-mentioned problem. The specific implementation methods of this application are described in detail below in conjunction with the accompanying drawings.

[0058] For example, Figure 1 As shown, this embodiment provides an optical cable buried depth detection system, including:

[0059] A phase-sensitive optical time-domain reflectometer 11, which is connected to the optical cable to be tested, and is used to collect first vibration data formed by the detection vibration in the optical cable to be tested according to the received collection instruction, and after adding time information to the first vibration data, upload the first vibration data to the background processing module 13; wherein the detection vibration is generated by applying at a vibration applying position, and the vibration applying position is determined according to the optical cable route of the optical cable to be tested and is located directly above the optical cable route;

[0060] It is understandable that in this embodiment, in order to ensure the accuracy of the detected buried depth of the optical cable, the vibration application position is located directly above the optical cable route; it is understandable that when constructing today's optical cables, it is necessary to accurately record relevant data such as buried depth, and form a digital layout of the underground construction of optical cables with other sections of constructed optical cables. In this way, when it is necessary to detect the optical cable, the exact position directly above the optical cable can be found on the ground through the digital layout. However, there are still some optical cables that were built historically. Due to the immaturity of information technology at that time, it is impossible to form a digital optical cable route. It is only by designing a marker stake at a certain distance on the ground when constructing the optical cable to mark the fuzzy position of the optical cable route underground. Therefore, the exact position directly above a certain optical cable route in these historical optical cables cannot be determined, and it is necessary to locate the position directly above the optical cable route by knocking.

[0061] This application has already determined the direction of the optical cable route in advance through other labels such as markers, and then set multiple route knocking points at certain intervals and knock them separately. The route knocking point position corresponding to the maximum amplitude of the vibration data obtained by the phase-sensitive optical time domain reflectometry device is directly above the optical cable route. It can be understood that vibrations propagate in the soil, and the intensity will be continuously weakened as the transmission distance becomes longer. Therefore, if the knocking point is knocked directly above the optical cable route, the vibration can be transmitted at a vertical distance, and the transmission distance is the shortest, so the vibration intensity is weakened the least, and the amplitude of the vibration data formed after reaching the optical cable is the largest, thereby finding the top of the optical cable route.

[0062] In this embodiment, the detection vibration may be a vibration of a certain preset frequency. By applying a vibration of a certain preset frequency as the detection vibration, the corresponding information of the detection vibration can be extracted more conveniently.

[0063] Specifically, in a preferred implementation manner of this embodiment, the detection vibration can be generated by knocking on the ground, and the corresponding equipment and operation are simple, and only a knocking tool such as a rubber hammer is needed to apply the detection vibration.

[0064] It is understandable that the phase-sensitive optical time domain reflection device is based on the strong perception of the light transmitted in the optical fiber to the surrounding environment, through the effect of vibration on the transmitted light, and after reflection demodulation, it is compared with the reference light, and whether vibration is generated according to the changes in the waveforms such as phase and amplitude; it is understandable that the main components of the optical cable are optical fiber and protective materials, so it is well equipped with the strong perception of the optical fiber to the environment. Because the optical cable is very sensitive to environmental changes, when a certain position on the optical cable receives vibration, the properties of the light transmitted in the optical cable will change, and the changed light is reflected back to the phase-sensitive optical time domain reflection device, and the phase-sensitive optical time domain reflection device restores the light with changed waveforms such as phase and amplitude to obtain a vibration signal. It is understandable that compared with the transmission speed of vibration in the soil, the transmission speed of light in the optical fiber is more than 5 orders of magnitude ahead, so the phase-sensitive optical time domain reflection device can quickly detect the vibration signal, and the transmission time of the vibration from the vibration position of the optical cable to the phase-sensitive optical time domain reflection device can be ignored. The phase-sensitive optical time-domain reflectometry device may include but is not limited to DVS (Distributed Optical Fiber Vibration Sensing System), DAS (Distributed Optical Fiber Audio Sensing System), and the like.

[0065] It is understandable that, according to the propagation principle of vibration, the detection vibration propagates in all directions. During the propagation process, the detection vibration is received by the optical cable to be tested buried underground. At the same time, the position point of the optical cable to be tested corresponding to the vibration application position is further obtained through the phase-sensitive optical time domain reflection device. The distance from the vibration application position to the position point is the shortest distance from the vibration application position to the optical cable to be tested, that is, the burial depth of the optical cable to be tested. After receiving the detection vibration, the optical cable to be tested is received and processed by the phase-sensitive optical time domain reflection device connected to the optical cable to be tested to form the first vibration data.

[0066] The vibration collection device 12 is used to collect the second vibration data formed by the detection vibration on the ground according to the received collection instruction, and after adding time information to the second vibration data, upload the second vibration data to the background processing module 13;

[0067] It can be understood that in this embodiment, since the propagation direction of the detection vibration is to propagate in all directions, the detection vibration will not only propagate downward during the propagation process, but also propagate horizontally along the ground direction. It can be received by the vibration collection device set at a ground position at a certain horizontal distance from the vibration application position to form the second vibration data.

[0068] The background processing module 13 is used to generate the acquisition instruction and send the acquisition instruction to the phase-sensitive optical time domain reflection device 11 and the vibration acquisition device 12 respectively; it is also used to receive the uploaded first vibration data and the second vibration data, align the first vibration data and the second vibration data according to the time information, and obtain the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data.

[0069] Specifically, Figure 2 As shown, the process of waveform image generation can be divided into the following steps:

[0070] S110, the collection instruction includes a countdown duration, and the countdown duration is set at a plurality of time points at the same time interval;

[0071] S120, the phase-sensitive optical time-domain reflectometry device uploads the first vibration data to the background processing module once at a time point; the background processing module generates a first vibration real-time waveform image according to the first vibration data;

[0072] S130, the vibration collection device uploads the second vibration data to the background processing module once at a time point, and the background processing module generates a second vibration real-time waveform image according to the second vibration data;

[0073] S140: After the countdown period is completed, the background processing module pre-processes and aligns all the first vibration data and the second vibration data received to generate an integrated waveform image.

[0074] Specifically, Figure 3 As shown, the preprocessing and alignment of all the received first vibration data and the second vibration data to generate an integrated waveform image can be subdivided into the following steps:

[0075] S141, performing frame loss detection and supplementation processing on all the first vibration data received to generate a first waveform image;

[0076] S142, performing frame loss detection, supplementation processing, and filtering processing on all the received second vibration data to generate a second waveform image;

[0077] S143: Align the first waveform image and the second waveform image according to time information to generate an integrated waveform image.

[0078] It is understandable that the alignment is specifically to set the first vibration data and the second vibration data on the same time axis according to the time information in the first vibration data and the second vibration data, and the sequence relationship between the first vibration data and the second vibration data can be clearly obtained through the time axis.

[0079] Exemplarily, the present application provides an embodiment to introduce the detailed work of the background processing module, which is as follows:

[0080] Connect the spare core of the optical cable to be tested to the phase-sensitive optical time-domain reflectometry device. Preferably, the phase-sensitive optical time-domain reflectometry device is installed in the machine room and the optical cross-box; the inspector prepares the inspection on the ground above the optical cable whose burial depth needs to be measured. The background processing module includes an APP developed according to the optical cable burial depth detection system. The APP is used to achieve long-distance connection with the phase-sensitive optical time-domain reflectometry device; tapping is performed at a position near the optical cable route of the optical cable to be tested to estimate the rough length of the optical cable to be tested, and then the position of the vibration collection device and the position range of the vibration application are set according to the length, so as to improve the accuracy of the burial depth data; and then the APP is used to establish a connection with the server of the vibration collection device at the same time;

[0081] After the APP is successfully connected to the phase-sensitive optical time-domain reflectometer and the vibration acquisition device, an acquisition instruction is sent through the APP for the phase-sensitive optical time-domain reflectometer and the vibration acquisition device to receive, wherein the acquisition instruction includes a countdown duration, preferably, set to 10 seconds in this example; when the APP sends the acquisition instruction, the time module of the APP also starts the corresponding countdown work; when the phase-sensitive optical time-domain reflectometer and the vibration acquisition device receive the acquisition instruction, they immediately report real-time vibration data to the APP.

[0082] It is understandable that the real-time vibration data of the phase-sensitive optical time-domain reflection device and the vibration collection device will be uploaded in the form of each data packet, and will carry the corresponding time when the vibration data is collected, the time is accurate to milliseconds, and a frame of vibration data will be reported at a fixed time interval. Preferably, in this example, the fixed time interval is set according to the needs of the actual measurement situation. The length of each frame of vibration data is set to A, and it is automatically reported to the APP after compression and encryption. It is understandable that the length of each frame of vibration data is pre-negotiated by the phase-sensitive optical time-domain reflection device and the vibration collection device to prevent frame loss during data transmission.

[0083] After the APP obtains the vibration data reported by the phase-sensitive optical time-domain reflectometer, it decompresses and decrypts the data and unpacks the data according to the protocol to obtain the original vibration data array listTemp of each frame of the phase-sensitive optical time-domain reflectometer and the corresponding time, wherein listTemp is a double array; the processing module of the APP traverses the array listTemp and normalizes the array listTemp, specifically dividing each value of the array listTemp by 2 15 , ensure that each value in the array listTemp is within ±1;

[0084] Perform frame loss detection and frame loss supplement on the array listTemp:

[0085] ·Pre-assign a frame array list 1 , the array list 1 Used to fill the lost frames, the list 1 The length of the list is consistent with the frame length reported by the phase-sensitive optical time-domain reflectometer, that is, the length is also A. 1 The value of each point is -2;

[0086] Assign an empty array Arr. The processing of the empty array Arr is divided into the following two cases:

[0087] The APP compares the time of each frame of vibration data received to determine the time interval between the current frame and the next frame:

[0088] 1. If the time interval is a set fixed time interval, the current frame data and the corresponding time are added to the array Arr;

[0089] 2. If the time interval is not the set fixed time interval, divide the time difference between the current frame and the next frame by the set fixed time interval value to get the number of lost frames a, then add the current frame to the array Arr, and then add a number of the array list 1 Add it to the array Arr, and record the time of each frame, and calculate it in this way to obtain an N-frame array Arr.

[0090] It is understandable that this operation is to prevent the situation in which the time and vibration data cannot correspond one to one after the phase-sensitive optical time-domain reflectometry device uploads frame loss during network transmission.

[0091] After the APP obtains the vibration data reported by the vibration collection device, it decompresses and decrypts and unpacks the data according to the protocol to obtain each frame of vibration data and the corresponding time. The vibration data reported by the vibration collection device is processed by frame loss detection and frame loss supplement as described above, and saved in the array Arr 1 In the same process, we also get an M frame array Arr 1 .

[0092] It is understandable that after the APP processes the acquired data packets, three waveform display panels are set on the display panel, and the display panel TU 1 The display panel TU is a real-time waveform image of the first vibration of the phase-sensitive optical time-domain reflectometer. 2 Display the second vibration real-time waveform image of the vibration collection device, display panel TU 3 The display is an integrated waveform image. 1 The timer plays a frame of the array in Arr at a preset time interval. 2 The timer plays a frame of Arr at a preset time interval 1 The time interval is preset according to the actual measurement situation.

[0093] When the APP enters the countdown, the inspector knocks on the ground area where the vibration is applied 3 to 5 times at irregular time intervals. This action provides multiple vibration signals for the vibration collection device and the optical cable to be tested buried underground.

[0094] After the countdown ends, it is determined that the number of waveform frames of the vibration acquisition device is the number of frames corresponding to the time set by the acquisition instruction, and the original vibration data Arr of the vibration acquisition device is obtained. 1 Preferably, because in this example, the countdown is set to 10 seconds, it is determined that the number of waveform frames of the vibration acquisition device is 40 frames.

[0095] According to the characteristic algorithm of the vibration collection device pair, a set of filter arrays with positive and negative values ​​are obtained, and the filter array is traversed in reverse, and the value of each filter array is divided by 2. 14 , get the normalized filter array Arr 2 ;

[0096] Define a 2 An empty double array dataTemp of the same length as Arr 1 The empty double array dataOut of the same length uses the dataTemp and the dataOut as the intermediate processing parameters of the convolution filter to convert the original vibration data Arr 1 and the filter array Arr 2 Perform convolution filtering to obtain a new vibration data array Arr of the vibration collection device 3 .

[0097] According to the phase-sensitive optical time domain reflectometry device vibration data array Arr and the vibration acquisition device vibration data array Arr 3 , obtain the first frame time of the array, and compare the first frame time, take the array corresponding to the later first frame time as the starting point of the merged waveform image, and the array corresponding to the earlier first frame time is offset and intercepted forward according to the time and point time difference, until it is offset to the same time starting point as the array corresponding to the later first frame time.

[0098] The Arr and Arr 3 The normalization process is performed so that the values ​​of the two waveform arrays are between ±1, and then the Arr and Arr are colored differently. 3 Describe in APPTU 3 The waveform is displayed on the panel. Since the ground is hit 3 to 5 times during the countdown time, the TU 3 There will be 3 to 5 waveforms with larger vibration amplitudes on the waveform graph, thereby obtaining the integrated waveform image.

[0099] Specifically, the vibration application position is determined according to the optical cable route of the optical cable to be tested, and specifically includes:

[0100] Positioning vibrations are applied to several ground positions along a path intersecting with the optical cable route of the optical cable to be tested, and the vibration intensity of each positioning vibration is collected through the optical cable to be tested, and the positioning vibration with the largest vibration intensity is used as the vibration application position.

[0101] In this embodiment, the positioning vibration can be a vibration with a preset amplitude. By applying a vibration with a preset amplitude as the positioning vibration, the amplitude of the applied positioning vibration is ensured to be the same, and the ground position of the positioning vibration with the maximum vibration intensity can be more conveniently obtained; wherein, the positioning vibration can be generated by a vibration generating device in the prior art that can generate vibrations of the same amplitude.

[0102] It is understandable that during the vibration propagation process, as the vibration propagation distance continues to increase, the vibration intensity will continue to decay. Then, at a certain position point on the optical cable to be tested, the positioning vibration with the maximum vibration intensity is detected, indicating that the vibration attenuation of the positioning vibration is the smallest, indicating that the straight-line distance between the ground position of the positioning vibration and the corresponding position point of the optical cable to be tested is the shortest, indicating that the ground position is located directly above the optical cable route. The positioning determination of the vibration application position can be completed by connecting the phase-sensitive optical time domain reflection device of the optical cable to be tested without the need for additional equipment, and the operation is simple and convenient, which improves the detection efficiency while reducing the operating cost.

[0103] Specifically, the time information is generated by a time synchronization device; both the phase-sensitive optical time-domain reflectometry device and the vibration collection device are equipped with the time synchronization device; and the time synchronization device includes a GPS unit.

[0104] It is understandable that the phase-sensitive optical time-domain reflectometer device and the vibration acquisition device are respectively configured with a time synchronization device to generate the corresponding time information, so that the vibration acquisition device can run detection separately from the phase-sensitive optical time-domain reflectometer device. The phase-sensitive optical time-domain reflectometer device and the vibration acquisition device only need to upload the detected vibration data, thereby reducing the data interaction process and improving the detection efficiency.

[0105] In a preferred implementation of this embodiment, the time synchronization device includes a GPS unit. The GPS unit has a simple structure and can effectively obtain millisecond-level positioning time, thereby reducing the cost of the equipment while ensuring positioning accuracy.

[0106] It is understandable that the phase-sensitive optical time-domain reflection device and the vibration collection device are respectively designed with GPS modules, which can identify the vibration data generated by the knocking of this application through the time information generated by their respective GPS, thereby reducing the interference of noise data. Because in the process of knocking, in addition to the vibration of the knocking of this application, there will be many other interfering vibrations on the ground, and these interfering vibrations can also generate noise data in the vibration collection device, so the time information generated by the respective GPS is needed to mark the vibration of the knocking of this application, so as to distinguish the vibration data and noise data required by this application, and facilitate subsequent comparative analysis; furthermore, because the knocking can be performed at the knocking point in two ways, a single knock and multiple knocks, when multiple knocks are used, the two devices will generate multiple vibration data, and the time information generated by the GPS is also needed to mark each vibration data of the two devices one by one.

[0107] Example 1

[0108] Exemplarily, the present application provides Example 1, which is a method 1 for the system to measure the buried depth of the optical cable to be measured:

[0109] Specifically, the vibration collection device and the vibration applying position are arranged at the same ground position.

[0110] Specifically, obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data specifically includes:

[0111] The peak difference between the aligned first vibration data and the second vibration data is obtained, and the peak difference distance is calculated by a velocity formula, and the peak difference distance is used as the buried depth of the optical cable to be tested.

[0112] It is understandable that in this embodiment, it is necessary to obtain the point difference of 3 to 5 wave crest vibrations of the first vibration data and the second vibration data according to the integrated waveform image, calculate each wave crest difference, and then calculate the distance between two points of each wave crest difference according to the propagation speed, and average the distance between two points of each wave crest difference to obtain the buried depth of the optical cable to be measured. Then, the buried depth of the optical cable to be measured is displayed on the APP, and the buried depth of the optical cable is calculated at this time.

[0113] Example 2

[0114] Illustratively, the present application provides Example 2, which is a second method for the system to measure the buried depth of the optical cable to be measured:

[0115] Specifically, the vibration collection device is arranged at a ground position at a certain horizontal distance from the vibration applying position.

[0116] Specifically, Figure 4As shown, the step of obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data can be specifically divided into the following steps:

[0117] S210: If the start time points of the aligned first vibration data and the second vibration data coincide with each other, the horizontal distance between the vibration collection device and the vibration application position is used as the buried depth of the optical cable to be tested;

[0118] S220: If the starting time points of the first vibration data and the second vibration data after alignment do not coincide with each other, adjusting the horizontal distance between the vibration acquisition device and the vibration application position, and re-applying the detection vibration, until a certain horizontal distance is found so that the starting time point of the first vibration data and the second vibration data corresponding to the re-application of the detection vibration coincides with each other.

[0119] It can be understood that the time Δt required for the detection vibration generated at the vibration application position to propagate longitudinally in the soil to the optical cable is 1 , the time Δt required for the detection vibration generated at the vibration application position to propagate laterally in the soil to the vibration collection device 2 , detect the time point t when the vibration starts to occur at the vibration application position 0 The time point t at which the phase-sensitive optical time-domain reflectometry device starts to receive the detected vibration 1 The time point t when the vibration collection device starts to receive the detection vibration 2 ;

[0120] It is understandable that:

[0121] Δt 1 =t 1 -t 0

[0122] Among them, t 1 and t 0 are all positive integers, and numerically, t 1 T 0 big.

[0123] akin:

[0124] Δt 2 =t 2 -t 0

[0125] Among them, t 2 and t 0 are all positive integers, and numerically, t 2 T 0 big.

[0126] According to the above Δt 1 and Δt2 From the formula, we can see that each vibration is generated at the same ground position, so the detection vibration starts at the same time, so the same data t is used. 0 It is understandable that the alignment operation for the first vibration data and the second vibration data should be performed at the time point t at which the vibration in the first vibration data begins to be generated. 0 and the time point t at which the vibration starts to occur in the second vibration data 0 The alignment is performed so that the first vibration data and the second vibration data share the same time axis, thereby being able to more clearly compare the time sequence of the two.

[0127] It is understandable that the monitoring vibration is generated at the vibration application position, and the detection vibration is usually propagated around the vibration source. Two directions of the vibration are taken as the detection directions of this application: one is the detection vibration propagating horizontally from the ground to the vibration collection device, and the other is the detection vibration propagating vertically from the soil to the optical cable to be tested. Assume that the longitudinal distance from the vibration application position to the optical cable is L 1 The lateral distance from the vibration application position to the vibration collection device is L 2 .L 2 can be directly measured from the ground, and L 1 The buried depth to be measured.

[0128] Assume that the speed of the detection vibration generated at the vibration application position propagating longitudinally in the soil to the optical cable to be tested is V 1 The speed at which the vibration generated at the vibration application position propagates laterally in the soil to the vibration collection device is V 2 , combined with Δt 1 and Δt 2 , according to the speed formula:

[0129] L 1 =V 1 ×Δt 1

[0130] L 2 =V 2 ×Δt 2

[0131] It is understandable that the detection vibration is propagated by soil. In this embodiment, the detection vibration is propagated in soil within a certain range, and the composition of the soil is similar, so it can be considered that V 1 and V 2 They are numerically equal, that is:

[0132] V 1 =V 2

[0133] Then we can get L 1Only subject to Δt 1 The impact of L 2 Only subject to Δt 2 And because according to the above Δt 1 and Δt 2 From the formula, we know that Δt 1 and Δt 2 The formula uses the same data t 0 As the only intermediate quantity, Δt 1 Only subject to 1 The influence of Δt 1 Only subject to 2 Influence. It can be concluded that L 1 Only subject to 1 The impact of L 2 Only subject to 2 impact.

[0134] Therefore, it is only necessary to adjust the time point t at which the phase-sensitive optical time-domain reflectometer starts to receive the detection vibration. 1 and the time point t at which the vibration collection device starts to receive the detection vibration 2 If the vibration is applied to the optical cable, the longitudinal distance L 1 and the lateral distance L from the vibration application position to the vibration collection device 2 Adjust to be equal, L 2 It can be directly measured on the ground to obtain L 1 , and the buried depth of the optical cable can be obtained.

[0135] In this embodiment, the starting time point represents the time point when the detection vibration is received. Figure 5 As shown, the above steps have processed and aligned the first vibration data and the second vibration data to generate an integrated waveform image (a), a waveform image (b) collected by the phase-sensitive optical time-domain reflectometer, and a waveform image (c) collected by the vibration collection device.

[0136] In this embodiment, since the first vibration data and the second vibration data are aligned in the same time axis, the time information in the first vibration data and the second vibration data actually reflects the distance from the vibration application position to the optical cable to be tested and the vibration acquisition device respectively. Therefore, the burial depth of the optical cable to be tested is obtained according to the starting time points of the aligned first vibration data and the second vibration data, and the horizontal distance between the vibration acquisition device and the vibration application position.

[0137] If the starting time points of the aligned first vibration data and the second vibration data coincide, the horizontal distance between the vibration collection device and the vibration application position is used as the buried depth of the optical cable to be measured. In this embodiment, there is no need to measure the propagation speed of the vibration, the calculation steps are simple and accurate, and the efficiency of the buried depth detection calculation of the optical cable to be measured is effectively improved.

[0138] Specifically, when the starting time points do not coincide, it means that the shortest distances from the vibration application position to the optical cable to be tested and the vibration collection device are not equal, and it is necessary to adjust the horizontal distance between the vibration collection device and the vibration application position so that the starting time points of the first vibration data and the second vibration data coincide.

[0139] Specifically, the adjusting the horizontal distance between the vibration collection device and the vibration applying position specifically includes:

[0140] Keeping the vibration applying position unchanged, moving the setting position of the vibration collecting device to increase or decrease the horizontal distance between the setting position of the vibration collecting device and the vibration applying position;

[0141] The straight line connecting the vibration applying position and the vibration collecting device is perpendicular to the optical cable routing direction.

[0142] It is understandable that when the starting time points do not overlap, the starting time points of the first vibration data and the second vibration data have a sequential relationship, and there is a certain time difference between the starting time points of the two. The adjustment operation is specifically as follows:

[0143] Keeping the vibration application position unchanged and moving the setting position of the vibration collection device, it is necessary to obtain the time difference between the first vibration data and the second vibration data corresponding to the starting time point of the detected vibration, obtain the distance relationship between the vibration application position and the vibration collection device and the optical cable to be tested respectively according to the time difference, and move the setting position of the vibration collection device according to the distance relationship.

[0144] Specifically, under the premise that the starting time points do not overlap, the time difference situations mainly include two types: the first situation is that the starting time point of the first vibration data is before the starting time point of the second vibration data, which means that the shortest distance from the vibration application position to the optical cable to be tested is less than the horizontal distance from the vibration application position to the vibration collection device, and it is necessary to adaptively move the setting position of the vibration collection device to make the vibration collection device close to the vibration application position;

[0145] The second situation is that the starting time point of the first vibration data is after the starting time point of the second vibration data, which means that the shortest distance from the vibration application position to the optical cable to be tested is greater than the horizontal distance from the vibration application position to the vibration collection device, and it is necessary to adaptively adjust the setting position of the vibration collection device to make the vibration collection device away from the vibration application position;

[0146] During the above adjustment process, the vibration application position also continuously applies the detection vibration, so that the starting time point of the second vibration data can be continuously updated until a setting position is found that makes the starting time points of the first vibration data and the second vibration data coincide.

[0147] It is understandable that by defining the straight line between the vibration application position and the vibration collection device to be perpendicular to the optical cable route, the measurement accuracy can be improved.

[0148] It is understandable that the above method of measuring the burial depth by setting the vibration collection device at a ground position at a certain horizontal distance from the vibration application position can be extended to another method of adjusting the horizontal distance, as shown in Example 3.

[0149] Example 3

[0150] For example, the present application provides Example 3, which is a method 3 for the system to measure the buried depth to be measured:

[0151] Specifically, the adjusting the horizontal distance between the collection and receiving device and the vibration applying position specifically includes:

[0152] Keeping the setting position of the vibration collection device unchanged, moving the vibration application position to increase or decrease the horizontal distance between the setting position of the vibration collection device and the vibration application position;

[0153] The moving track of the vibration application position is projected onto the route of the optical cable to be tested.

[0154] It is understandable that when the starting time points do not overlap, the starting time points of the first vibration data and the second vibration data have a sequential relationship, and there is a certain time difference between the starting time points of the two. The adjustment operation is specifically as follows:

[0155] Keeping the setting position of the vibration collection device unchanged and moving the vibration application position, it is necessary to obtain the time difference between the first vibration data and the second vibration data corresponding to the starting time point of the detected vibration, obtain the distance relationship between the vibration application position and the vibration collection device and the optical cable to be tested respectively according to the time difference, and move the vibration application position according to the distance relationship.

[0156] Specifically, under the premise that the starting time points do not overlap, the time difference situations mainly include two types: the first situation is that the starting time point of the first vibration data is before the starting time point of the second vibration data, which means that the shortest distance from the vibration application position to the optical cable to be tested is less than the horizontal distance from the vibration application position to the vibration collection device, and it is necessary to adaptively move the vibration application position so that the vibration application position is close to the setting position of the vibration collection device;

[0157] The second situation is that the starting time point of the first vibration data is after the starting time point of the second vibration data. This means that the shortest distance from the vibration application position to the optical cable to be tested is greater than the horizontal distance from the vibration application position to the vibration collection device. In this case, it is necessary to adaptively adjust the vibration application position so that the vibration application position is away from the vibration collection device.

[0158] During the above adjustment process, the vibration application position also continuously applies the detection vibration, so that the starting time point of the second vibration data can be continuously updated until a setting position is found that makes the starting time points of the first vibration data and the second vibration data coincide.

[0159] It is understandable that the moving trajectory of the vibration application position is projected onto the optical cable route to be tested, which can conveniently realize the movement of the vibration application position, thereby facilitating the measurement of the horizontal distance between the vibration collection device and the vibration application position and reducing the introduction of other parameters.

[0160] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An optical cable buried depth detection system, characterized in that: The system specifically comprises: A phase-sensitive optical time-domain reflectometry device, the phase-sensitive optical time-domain reflectometry device is connected to the optical cable to be tested, and is used to collect first vibration data formed by the detection vibration in the optical cable to be tested according to the received collection instruction, and after adding time information to the first vibration data, upload the first vibration data to the background processing module; wherein the detection vibration is generated by applying at a vibration applying position, and the vibration applying position is determined according to the optical cable route of the optical cable to be tested and is located directly above the optical cable route; A vibration collection device, used for collecting second vibration data formed on the ground by the detection vibration according to the received collection instruction, and uploading the second vibration data to the background processing module after adding time information to the second vibration data; The background processing module is used to generate the acquisition instruction and send the acquisition instruction to the phase-sensitive optical time domain reflection device and the vibration acquisition device respectively; and is also used to receive the uploaded first vibration data and the second vibration data, align the first vibration data and the second vibration data according to the time information, and obtain the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data.

2. The optical cable buried depth detection system according to claim 1, characterized in that: The acquisition instruction includes a countdown duration, and the countdown duration is set at a plurality of time points at the same time interval; The phase-sensitive optical time-domain reflectometry device uploads the first vibration data to the background processing module once at one time point; the background processing module generates a first vibration real-time waveform image according to the first vibration data; The vibration collection device uploads the second vibration data to the background processing module once at a time point, and the background processing module generates a second vibration real-time waveform image according to the second vibration data; After the countdown time is completed, the background processing module pre-processes and aligns all the first vibration data and the second vibration data received to generate an integrated waveform image.

3. The optical cable buried depth detection system according to claim 2, characterized in that: Preprocessing and aligning all the received first vibration data and the second vibration data to generate an integrated waveform image specifically includes: Perform frame loss detection and supplementation processing on all the first vibration data received to generate a first waveform image; Perform frame loss detection, supplementation processing, and filtering processing on all the received second vibration data to generate a second waveform image; The first waveform image and the second waveform image are aligned according to time information to generate an integrated waveform image.

4. The optical cable buried depth detection system according to claim 1, characterized in that: The vibration collection device and the vibration applying position are arranged at the same ground position.

5. The optical cable buried depth detection system according to claim 4, characterized in that: The obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data specifically includes: The peak difference between the aligned first vibration data and the second vibration data is obtained, and the peak difference distance is calculated by a velocity formula, and the peak difference distance is used as the buried depth of the optical cable to be tested.

6. The optical cable buried depth detection system according to claim 1, characterized in that: The vibration collection device is arranged at a ground position at a certain horizontal distance from the vibration applying position.

7. The optical cable buried depth detection system according to claim 6, characterized in that: The obtaining the buried depth of the optical cable to be tested according to the aligned first vibration data and the second vibration data specifically includes: If the start time points of the first vibration data and the second vibration data after alignment coincide, the horizontal distance between the vibration collection device and the vibration application position is used as the buried depth of the optical cable to be tested; If the starting time points of the first vibration data and the second vibration data after alignment do not coincide, the horizontal distance between the vibration acquisition device and the vibration application position is adjusted, and the detection vibration is reapplied until a certain horizontal distance is found so that the first vibration data and the second vibration data coincide with the starting time point corresponding to the re-application of the detection vibration.

8. The optical cable buried depth detection system according to claim 7, characterized in that: The adjusting the horizontal distance between the vibration collection device and the vibration application position specifically includes: Keeping the vibration applying position unchanged, moving the setting position of the vibration collecting device to increase or decrease the horizontal distance between the setting position of the vibration collecting device and the vibration applying position; The straight line connecting the vibration applying position and the vibration collecting device is perpendicular to the optical cable routing direction.

9. The optical cable buried depth detection system according to claim 7, characterized in that: The adjusting the horizontal distance between the vibration collection device and the vibration application position specifically includes: Keeping the setting position of the vibration collection device unchanged, moving the vibration application position to increase or decrease the horizontal distance between the setting position of the vibration collection device and the vibration application position; The moving track of the vibration application position is projected onto the route of the optical cable to be tested.

10. An optical cable buried depth detection system according to any one of claims 1 to 9, characterized in that: The vibration application position is determined according to the optical cable route of the optical cable to be tested, specifically including: Positioning vibrations are applied to several ground positions along a path intersecting with the optical cable route of the optical cable to be tested, and the vibration intensity of each positioning vibration is collected through the optical cable to be tested, and the positioning vibration with the largest vibration intensity is used as the vibration application position.

11. The optical cable buried depth detection system according to claim 1, characterized in that: Also includes: The time information is generated by a time synchronization device; both the phase-sensitive optical time domain reflectometry device and the vibration collection device are equipped with the time synchronization device; the time synchronization device includes a GPS unit.

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