An optical cable deformation detection method and device, electronic equipment and storage medium

Abstract

The application discloses a kind of optical cable deformation detection methods, according to the preset frequency to the optical fiber line being monitored sequentially inject multiple detection pulse signals, and obtain the backscattering signal corresponding to each detection pulse signal, generate the signal intensity curve of backscattering signal, determine the signal point intensity variation value of each position of optical fiber line based on signal intensity curve, sequentially judge the signal point intensity variation value corresponding to each position and whether the signal intensity of backscattering signal satisfies preset condition, based on the number of position satisfying preset condition in optical fiber line confirm whether need to carry out alarm to optical fiber line. It can effectively remove signal interference influence under the premise of not additional increase equipment cost, to reduce the false positive rate under the premise of improving detection precision, reduce the false negative rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber sensing measurement, in particular to a kind of optical cable deformation detection method.The present application also relates to a kind of optical cable deformation detection device, electronic equipment and storage medium. BACKGROUND

[0002] In the existing optical cable deformation fence system, mainly using P-OTDR (Polarization optical time-domain reflectometer, polarization sensitive optical time domain reflectometer) detector, the change of optical cable bending state caused by intruder in the intrusion process is detected, and intrusion alarm is generated.

[0003] In the current optical cable deformation fence system, an alarm threshold is set for the P-OTDR amplitude change caused by the change of optical cable bending state. When the P-OTDR amplitude change is greater than the alarm threshold, an alarm is generated, otherwise no alarm is generated. However, in addition to the change of optical cable bending, other factors can also cause the change of P-OTDR amplitude, which can cause false alarm of the change of optical cable bending state. For example, the change of optical cable bending state may only change the bending curvature from 20-30 cm to about 40 cm. Therefore, the signal strength of the P-OTDR data change caused by intruder in the intrusion process (the signal strength is obtained after logarithmic operation) may be only about 0.5 dB, while the P-OTDR data change noise root mean square caused by circuit noise can reach 0.02-0.05 dB.

[0004] The inventor found that if the alarm threshold is increased to reduce the false alarm rate, the false alarm rate of the optical cable deformation fence system can be reduced, but the false negative rate is high. On the contrary, if the alarm threshold is reduced to reduce the false negative rate, the false alarm rate of the optical cable deformation fence system will be significantly increased, which increases the processing burden of personnel and equipment.

[0005] To solve the above problems, the existing optical cable deformation fence system uses a double-machine linkage scheme: two optical fibers in the same optical cable are used, and one P-OTDR detector is connected to each optical fiber. When both P-OTDR detectors reach the alarm condition, the optical cable deformation fence system considers that a real alarm has occurred. Although the double-machine linkage scheme can greatly reduce the false negative rate and the false alarm rate, two P-OTDR detectors are required for each optical fiber line, which greatly increases the hardware cost. SUMMARY

[0006] The embodiment of the present application provides a kind of optical cable deformation detection method, device, electronic equipment and storage medium, to effectively remove signal interference effect under the premise of not additional increase equipment cost, to improve detection precision under the premise of reducing false alarm rate, reduce the rate of omission.

[0007] In the first aspect, an optical cable deformation detection method is provided, which is applied to an optical cable deformation fence system, and includes the following steps:

[0008] A plurality of detection pulse signals are sequentially injected into the monitored optical fiber line according to a preset frequency, and a backscattering signal corresponding to each detection pulse signal is obtained;

[0009] A signal intensity curve of the backscattering signal is generated, and the intensity curve includes a correspondence between the length of the optical fiber line and the signal intensity of each backscattering signal;

[0010] A signal point intensity change value of each position of the optical fiber line is determined based on the signal intensity curve; the signal point intensity change value is determined based on a signal intensity change curve of adjacent backscattering signals;

[0011] It is sequentially determined whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal meet a preset condition;

[0012] It is determined whether an alarm needs to be given for the optical fiber line based on the number of positions in the optical fiber line that meet the preset condition.

[0013] In some embodiments, it is sequentially determined whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal meet a preset condition, specifically as follows:

[0014] It is sequentially determined whether the signal point intensity change value corresponding to each position is greater than a preset signal change threshold, and whether the signal intensity is greater than a preset intensity threshold;

[0015] The position where the signal point intensity change value is greater than the preset signal change threshold and the signal intensity is greater than the preset intensity threshold is marked as a special point.

[0016] In some embodiments, the signal intensity change curve of the backscattering signal is generated, specifically as follows:

[0017] Each backscattering signal is accumulated;

[0018] The signal intensity change curve is generated according to the accumulated backscattering signal;

[0019] The coordinate axes of the signal intensity change curve are the intensity of the backscattering signal and the length of the optical fiber line, respectively.

[0020] In some embodiments, the signal point intensity variation value of each position of the optical fiber line is determined based on the signal intensity variation curve, specifically:

[0021] The signal intensity variation curve of the backscattering signal is subjected to intensity subtraction processing with the signal intensity variation curve of the previous backscattering signal.

[0022] The absolute value of the intensity subtraction processing result is used to generate a signal intensity variation curve corresponding to the positions.

[0023] In some embodiments, the signal intensity variation curve corresponding to the positions is generated based on the absolute value of the intensity subtraction processing result, specifically:

[0024] The signal intensity variation data of the backscattering signal in the optical fiber line is subjected to zeroing processing with the signal intensity variation value of the backscattering signal at the starting position of the optical fiber line as the reference value.

[0025] In some embodiments, whether an alarm needs to be given for the optical fiber line is determined based on the number of positions in the optical fiber line that meet the preset condition, specifically:

[0026] A product value of the number of special points and the interval of the fiber length coordinates of adjacent two points in the signal intensity variation curve is obtained.

[0027] If the ratio of the product value to the pulse width of the detection pulse signal is greater than a preset detection threshold, an alarm is given for the optical fiber line.

[0028] If the ratio of the product value to the pulse width of the detection pulse signal is not greater than the preset detection threshold, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line at a preset frequency.

[0029] In some embodiments, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line at a preset frequency, specifically:

[0030] The detection pulse signal corresponding to the pulse width is repeatedly injected into the optical fiber line at a time interval corresponding to the preset frequency until the number of injections reaches a number threshold corresponding to the preset frequency.

[0031] In a second aspect, an optical cable deformation detection device is provided, which comprises:

[0032] A signal processing module sequentially injects a plurality of detection pulse signals into the monitored optical fiber line at a preset frequency and obtains backscattering signals corresponding to each of the detection pulse signals.

[0033] a signal strength module, generating a signal strength curve of the backscattering signals, the strength curve comprising a correspondence between the length of the optical fiber line and the signal strength of each of the backscattering signals;

[0034] a signal strength change module, determining a signal point strength change value of each position of the optical fiber line based on the signal strength curve; the signal point strength change value being determined based on the signal strength change curve of adjacent backscattering signals;

[0035] a judgment module, judging whether the signal point strength change value corresponding to each position and the signal strength of the backscattering signals satisfy a preset condition in sequence;

[0036] an alarm module, confirming whether an alarm needs to be given to the optical fiber line based on the number of positions in the optical fiber line satisfying the preset condition.

[0037] In a third aspect, an electronic device is provided, comprising:

[0038] a processor; and

[0039] a memory for storing executable instructions of the processor;

[0040] The processor is configured to execute the method for detecting deformation of an optical cable according to any one of the first aspect by executing the executable instructions.

[0041] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the method for detecting deformation of an optical cable according to the first aspect.

[0042] By applying the above technical solutions, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line according to a preset frequency, and the backscattering signals corresponding to each detection pulse signal are obtained, a signal strength curve of the backscattering signals is generated, a signal point strength change value of each position of the optical fiber line is determined based on the signal strength curve, whether the signal point strength change value corresponding to each position and the signal strength of the backscattering signals satisfy a preset condition is judged in sequence, and whether an alarm needs to be given to the optical fiber line is confirmed based on the number of positions in the optical fiber line satisfying the preset condition. The above technical solutions can effectively remove signal interference without increasing the cost of equipment, thereby improving the detection accuracy and reducing the false alarm rate under the premise of reducing the false alarm rate. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0044] Figure 1 A flowchart of a cable deformation detection method according to an embodiment of the present application is shown in FIG. 1.

[0045] Figure 2 A fiber backscattering signal intensity change curve A according to an embodiment of the present application is shown in FIG. 2.

[0046] Figure 3 A fiber backscattering signal intensity change curve B according to an embodiment of the present application is shown in FIG. 3.

[0047] Figure 4 A P-OTDR data processing step diagram for improving the false alarm rate and the missed alarm rate of a cable deformation fence according to an embodiment of the present application is shown in FIG. 4.

[0048] Figure 5 A structure diagram of a cable deformation detection device according to an embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0050] It should be noted that other embodiments of the present application will readily occur to those skilled in the art having the benefit of the present description and practice. The present application is intended to include all such variations and modifications as fall within the scope of the present application, which is defined by the following claims, as well as the full scope of equivalents to which such claims are entitled. The description and examples are to be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.

[0051] It should be understood that the present application is not limited to the precise construction that has been described and illustrated herein and that various modifications and changes can be made therein without departing from the scope of the present application. The scope of the present application is limited only by the claims that follow.

[0052] The following will be described in detail Figure 1A method for detecting deformation of an optical cable according to an example embodiment of the present application will be described. It should be noted that the following application scenarios are only shown for the purpose of facilitating understanding of the spirit and principles of the present application, and the embodiments of the present application are not limited in this respect. On the contrary, the embodiments of the present application can be applied to any applicable scenario.

[0053] An example embodiment of the present application provides a method for detecting deformation of an optical cable, as shown in the figure, the method comprises the following steps: Figure 1

[0054] S101, a plurality of detection pulse signals are sequentially injected into a monitored optical fiber line according to a preset frequency, and backscattering signals corresponding to each detection pulse signal are obtained.

[0055] In the example embodiment, in order to eliminate the influence of signal noise as much as possible by accurate comparison processing, the same detection pulse signal is injected into the optical fiber line according to a fixed frequency. It should be noted that the frequency and the bandwidth of the detection pulse signal can be set according to the actual detection scene and detection requirements, and the setting of different detection parameters all belong to the protection scope of the present application.

[0056] Optionally, in this step, the detection pulse signal corresponding to the pulse width can be repeatedly injected into the optical fiber line according to the time interval corresponding to the preset frequency until the injection times reach the number threshold corresponding to the preset frequency.

[0057] In the example embodiment of the present application for obtaining the backscattering signal of the monitored optical fiber, the P-OTDR can inject a pulse signal with a pulse width of W into the monitored optical fiber every T time, obtain the backscattering signal, repeat N times, and accumulate the backscattering signals obtained N times. The value of T ranges from 0.1 ms to 2 ms, which is related to the measurement range of the optical fiber. The value of W ranges from 50 ns to 500 ns. The value of N ranges from 100 to 1000.

[0058] S102, a signal intensity curve of the backscattering signal is generated, and the intensity curve contains the correspondence between the length of the optical fiber line and the signal intensity of each backscattering signal.

[0059] In order to clearly represent the signal intensity of the backscattering signal at different length positions of the optical fiber, the present application uses an intensity curve to represent the correspondence between the length of the optical fiber line and the signal intensity of each backscattering signal. It should be noted that the specific setting of the coordinate axis and the generation method of the curve can be flexibly set based on different requirements and scenarios, which all belong to the protection scope of the present application.

[0060] ​In the embodiment of the present application for obtaining the OTDR curve data, the accumulated backscattering signals are processed to calculate the OTDR curve data; the Y axis of the OTDR curve is the backscattering signal intensity A of the optical fiber, and the unit is logarithm, and 0 dB corresponds to the signal-to-noise ratio SNR equal to 1; the X axis of the OTDR curve is the length of the optical fiber, and the 0 point is the starting point of the monitored optical fiber, and the interval between the adjacent two points on the X axis is ΔL, and the unit is meter.

[0061] In S103, the signal point intensity change value of each position of the optical fiber line is determined based on the signal intensity curve; the signal point intensity change value is determined based on the signal intensity change curve of the adjacent backscattering signals.

[0062] In order to clearly reflect the change between the adjacent signals, in this step, the backscattering signals are accumulated, and the signal intensity change curve is generated according to the accumulated backscattering signals. In the preferred embodiment of the present application, the coordinate axes of the signal intensity change curve in this process are the intensity of the backscattering signals and the length of the optical fiber line.

[0063] Further, in order to make the signal intensity change in the signal intensity change curve more clear, the signal intensity change curve of the backscattering signal is subjected to intensity subtraction processing with the signal intensity change curve of the previous backscattering signal, and then the absolute value of the intensity subtraction processing result is used to generate the signal intensity change curve corresponding to the positions.

[0064] Meanwhile, in order to ensure the consistency and standardization of the processing data, the signal intensity change value of the backscattering signal at the starting position of the optical fiber line is used as the reference value, and the signal intensity change data of the backscattering signal in the optical fiber line is subjected to zeroing processing.

[0065] In the specific process of determining the backscattering signal intensity change curve of the optical fiber, after obtaining the OTDR curve data each time, the backscattering signal intensity of the monitored optical fiber line is subtracted from the OTDR curve data obtained last time to obtain the backscattering signal intensity change data ΔA of each point of the monitored optical fiber line; for convenience of calculation, the backscattering signal intensity change value at the starting position of the monitored optical fiber line is used as the reference value, and the backscattering signal intensity change data ΔA is subjected to zeroing calculation.

[0066] In S104, it is judged whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal satisfy the preset condition.

[0067] In order to well eliminate false alarm rate caused by circuit noise with proper reduction of alarm threshold, it is required to simultaneously judge whether signal point intensity change value and signal intensity at a position in the optical fiber line both satisfy alarm triggering condition. The preset condition can be flexibly set based on different noise and different requirements in different scenarios, which all belong to the protection scope of the application.

[0068] In the embodiment, it is sequentially judged whether the signal point intensity change value corresponding to each position is greater than a preset signal change threshold, and whether the signal intensity is greater than a preset intensity threshold, and the position where the signal point intensity change value is greater than the preset signal change threshold and the signal intensity is greater than the preset intensity threshold is marked as a special point.

[0069] In the process of the application, the points in the optical fiber backscattering signal intensity change curve where the absolute value of ΔA is greater than a given threshold and the corresponding A is greater than 10 dB are calculated by using optical fiber backscattering signal intensity data A and intensity change signal data ΔA, and there are M points in total. The threshold is preset in the P-OTDR by an operator, and the threshold value ranges from 0.1 dB to 0.5 dB.

[0070] S105, confirming whether alarm needs to be given to the optical fiber line based on the number of positions in the optical fiber line that satisfy the preset condition.

[0071] Since the unit length of the optical fiber between the special points and the pulse width of the pulse signal have a relationship, the relationship between them can be used to judge whether there is an anomaly, and the specific judgment method is within the protection scope of the application.

[0072] In the embodiment, the product value of the number of special points and the interval of the optical fiber length coordinates of adjacent two points in the signal intensity change curve is obtained, and then the following judgment is made:

[0073] If the ratio of the product value to the pulse width of the detection pulse signal is greater than a preset detection threshold, alarm is given to the optical fiber line;

[0074] If the ratio of the product value to the pulse width of the detection pulse signal is not greater than the preset detection threshold, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line at a preset frequency.

[0075] In the process of specifically judging whether there is intrusion alarm, if the product of M and ΔL is greater than 0.2 times of W, it is considered that there is intrusion alarm; otherwise, it is considered that there is no intrusion alarm; wherein the unit of W is ns, and the unit of ΔL is meter.

[0076] By applying the above technical solution, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line according to a preset frequency, and the backscattering signals corresponding to each detection pulse signal are obtained to generate a signal intensity curve of the backscattering signals, the signal point intensity change value of each position of the optical fiber line is determined based on the signal intensity curve, whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal meet a preset condition is sequentially judged, and whether the optical fiber line needs to be alarmed is determined based on the number of positions in the optical fiber line that meet the preset condition. Without additional equipment cost, the signal interference can be effectively removed, so that the detection accuracy is improved and the false alarm rate is reduced.

[0077] In order to further illustrate the technical idea of the present application, the technical solution of the present application will be described in combination with a specific application scenario. The purpose of the present embodiment is to provide a method for improving the false alarm rate and the missed alarm rate of the optical cable deformation fence. In the case of appropriately reducing the alarm threshold, the false alarm rate caused by circuit noise can be well eliminated, so that the false alarm rate and the missed alarm rate of the optical cable deformation fence are improved.

[0078] As shown in Figure 2 , the optical fiber backscattering signal intensity change curve A; as shown in Figure 3 , the optical fiber backscattering signal intensity change curve B. Among them, curve A corresponds to the optical fiber backscattering signal intensity change state when the optical cable bending curvature change is small, and curve B corresponds to the optical fiber backscattering signal intensity change state when the optical cable bending curvature change is large.

[0079] Through analysis and calculation of the optical fiber backscattering signal intensity change curve data, the degree of change of the optical cable bending curvature and the optical fiber length from the optical cable bending curvature change location to the P-OTDR measurement point can be obtained. The optical cable deformation fence system determines whether there is an intrusion according to the degree of change of the optical cable bending curvature.

[0080] In order to obtain the optical fiber backscattering signal intensity change curve data, the P-OTDR first needs to obtain the backscattering signal of the monitored optical fiber; then through filtering, logarithmic operation and other processing, OTDR curve data is obtained; finally, the OTDR curve data obtained in the previous two groups of different time periods is subtracted to obtain the optical fiber backscattering signal intensity change curve.

[0081] When P-OTDR acquires the backscattering signal of the monitored optical fiber, the optical transmitter needs to inject pulse signals with a pulse width of W into the monitored optical fiber every T time, the optical receiver receives the backscattering signal of the optical fiber and amplifies it, then performs analog-digital conversion through the ADC circuit, and stores the data. After N times of repetition, the N times of acquired backscattering digitized signals are accumulated. Wherein, T is in the range of 0.1 ms to 2 ms, which is related to the measurement range of the optical fiber; W is in the range of 50 ns to 500 ns; N is in the range of 100 to 1000.

[0082] After the N times of accumulated backscattering digitized signals are filtered, logarithmically operated and processed, the OTDR curve data is obtained. The Y axis of the OTDR curve is the backscattering signal intensity A of the optical fiber, and the unit is logarithm. 0 dB corresponds to a signal-to-noise ratio SNR equal to 1. The X axis of the OTDR curve is the length of the optical fiber, and the 0 point is the starting point of the monitored optical fiber. The interval between the adjacent two points on the X axis is ΔL, and the unit is meter.

[0083] The backscattering signal intensity change curve of the optical fiber is calculated from the OTDR curve data: after obtaining the OTDR curve data each time, the backscattering signal intensity of the optical fiber is subtracted from the OTDR curve data obtained last time to obtain the backscattering signal intensity change data ΔA of each point of the monitored optical fiber line; for easy calculation, the backscattering signal intensity change value of the starting point of the monitored optical fiber line is taken as the reference value, and the backscattering signal intensity change data ΔA is calculated by zero.

[0084] The obtained backscattering signal intensity change curve of the optical fiber is shown in Figure 2 and Figure 3 .

[0085] In the backscattering signal intensity change curve of the optical fiber, if there is a sharp bending change on the optical cable, such as the bending curvature radius changes from 12.5 cm to 20 cm, then the C point in Figure 2 and Figure 3 is taken as the boundary, before the C point, the fluctuation in the backscattering signal intensity change curve of the optical fiber is mainly caused by the P-OTDR circuit noise, and in the case that the backscattering signal intensity A of the optical fiber is greater than 10 dB, the root mean square of the backscattering signal intensity change is small, less than 0.025 dB; after the C point, the fluctuation in the backscattering signal intensity change curve is caused by the bending change of the C point of the optical cable and the birefringence effect of the optical fiber, and in the case that the backscattering signal intensity A of the optical fiber is greater than 10 dB, the root mean square of the backscattering signal intensity change is large, more than 0.15 dB, and even more than 1 dB.

[0086] Therefore, when a relatively severe change in the curvature of the optical cable occurs, the characteristic of the optical fiber backscattering signal intensity variation curve is that many points with relatively large amplitude values will appear from the position of the change in the curvature of the optical cable. By analogy, the root mean square of the optical fiber backscattering signal intensity variation caused by the P-OTDR circuit noise is relatively small, and occasionally, noise with a relatively large amplitude value will appear, but the probability of the simultaneous appearance of many noise points with relatively large amplitude values is very small.

[0087] In the optical cable deformation fence system, it is generally desirable to have a relatively good optical cable curvature detection sensitivity, such as the curvature radius of the optical cable changing from 12.5 cm to 15 cm, which can be detected with a probability of 99%. However, in this state, the optical fiber backscattering signal intensity variation curve can be as shown in FIG. 2, and the root mean square of the optical fiber backscattering signal intensity variation caused by the change in the curvature of the optical cable is only about 0.15 dB, and the maximum value is less than 0.5 dB. Figure 1

[0088] If a simple threshold decision method is used, the root mean square of the noise of the optical fiber backscattering signal intensity variation is 0.02 dB, the threshold value is 0.4 dB, a total of 30,000 points are included in an optical fiber backscattering signal intensity variation curve, and one optical fiber backscattering signal intensity variation curve is taken per second, then the probability of false alarm in 1 hour can reach 0.2; if it is desired that the probability of false alarm in 1 year is less than 0.1, then the threshold value needs to be increased to 0.6 dB. The result of increasing the threshold value to 0.6 dB is that the curvature radius of the optical cable needs to change from 12.5 cm to 19 cm, otherwise the false negative rate will exceed 0.1.

[0089] If the threshold value is set to 0.3 dB, the number of points exceeding the threshold value is M, the interval between adjacent points on the X axis is ΔL, and the output optical pulse signal width of the P-OTDR is W, only when the product of M and ΔL is greater than 0.2 times W, it is considered that an alarm occurs, then the false alarm rate in 1 year is less than 0.1, and the false negative rate is less than 0.001. The unit of ΔL is meter, and the unit of W is ns.

[0090] ​Therefore, by using the characteristics of the fiber backscattering signal intensity change curve when the bending change occurs at a certain position on the optical cable, the false alarm rate caused by circuit noise can be well eliminated with appropriate reduction of the alarm threshold, thereby improving the false alarm rate and the missed alarm rate of the optical cable deformation fence: through the fiber backscattering signal intensity data A and the intensity change signal data ΔA, the points in the fiber backscattering signal intensity change curve that satisfy the condition that the absolute value of ΔA is greater than a given threshold value and the A value of the corresponding point is greater than 10 dB are calculated, and there are M points in total; the threshold value is set in the P-OTDR by an operator, and the threshold value is in the range of 0.1 dB to 0.5 dB; if the product of M and ΔL is greater than 0.2 times W, it is considered that there is an intrusion alarm; otherwise, it is considered that there is no intrusion alarm; wherein the unit of W is ns, and the unit of ΔL is meter.

[0091] Correspondingly, the application further provides an optical cable deformation detection device, as shown in the accompanying drawings, the device comprises: Figure 4

[0092] a signal processing module 401, which sequentially injects a plurality of detection pulse signals into the monitored optical fiber line according to a preset frequency, and acquires backscattering signals corresponding to each of the detection pulse signals;

[0093] a signal intensity module 402, which generates a signal intensity curve of the backscattering signals, wherein the intensity curve comprises a corresponding relationship between the length of the optical fiber line and the signal intensity of each of the backscattering signals;

[0094] a signal intensity change module 403, which determines signal point intensity change values of each position of the optical fiber line based on the signal intensity curve; the signal point intensity change value is determined based on the signal intensity change curve of adjacent backscattering signals;

[0095] a judgment module 404, which sequentially judges whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal satisfy a preset condition;

[0096] an alarm module 405, which confirms whether an alarm needs to be given for the optical fiber line based on the number of positions in the optical fiber line that satisfy the preset condition.

[0097] In specific embodiments of the present application, the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal are sequentially judged to satisfy a preset condition, specifically:

[0098] the signal point intensity change value corresponding to each position is sequentially judged to be greater than a preset signal change threshold value, and the signal intensity is judged to be greater than a preset intensity threshold value;

[0099] ​Marking the position of the signal point with the signal intensity change value greater than the preset signal change threshold value and the signal intensity greater than the preset intensity threshold value as a special point.

[0100] In specific embodiments of the present application, a signal intensity change curve of the backscattering signal is generated, specifically:

[0101] The backscattering signals are accumulated;

[0102] The signal intensity change curve is generated according to the accumulated backscattering signals;

[0103] The coordinate axes of the signal intensity change curve are the intensity of the backscattering signal and the length of the optical fiber line, respectively.

[0104] In specific embodiments of the present application, the signal point intensity change value of each position of the optical fiber line is determined based on the signal intensity change curve, specifically:

[0105] The signal intensity change curve of the backscattering signal is intensity-subtracted from the signal intensity change curve of the previous backscattering signal;

[0106] The absolute value of the intensity subtraction result is used to generate a signal intensity change curve corresponding to the positions.

[0107] In specific embodiments of the present application, the absolute value of the intensity subtraction result is used to generate a signal intensity change curve corresponding to the positions, specifically:

[0108] The signal intensity change value of the backscattering signal at the starting position of the optical fiber line is used as a reference value, and the signal intensity change data of the backscattering signal in the optical fiber line is zeroed.

[0109] In specific embodiments of the present application, whether an alarm needs to be given for the optical fiber line is determined based on the number of positions in the optical fiber line that meet the preset condition, specifically:

[0110] The product value of the number of special points and the interval of the fiber length coordinates of adjacent two points in the signal intensity change curve is obtained;

[0111] If the ratio of the product value to the pulse width of the detection pulse signal is greater than a preset detection threshold value, an alarm is given for the optical fiber line;

[0112] If the ratio of the product value to the pulse width of the detection pulse signal is not greater than the preset detection threshold value, a plurality of detection pulse signals are continuously injected into the monitored optical fiber line in sequence at a preset frequency.

[0113] In the embodiments of the present application, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line according to a preset frequency, specifically:

[0114] The detection pulse signal corresponding to the pulse width is repeatedly injected into the optical fiber line according to the time interval corresponding to the preset frequency until the number of injections reaches a number threshold corresponding to the preset frequency.

[0115] Correspondingly, the present application also provides an electronic device, comprising:

[0116] a processor; and

[0117] a memory for storing executable instructions of the processor;

[0118] The processor is configured to perform the optical cable deformation detection method as described in any one of the above embodiments by executing the executable instructions.

[0119] Correspondingly, the present application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the optical cable deformation detection method as described above.

[0120] By applying the above technical solution, a plurality of detection pulse signals are sequentially injected into the monitored optical fiber line according to a preset frequency, and the backscattering signals corresponding to each detection pulse signal are obtained to generate a signal intensity curve of the backscattering signals. The signal point intensity change value of each position of the optical fiber line is determined based on the signal intensity curve, and whether the signal point intensity change value corresponding to each position and the signal intensity of the backscattering signal meet a preset condition is sequentially judged. Whether the optical fiber line needs to be alarmed is determined based on the number of positions in the optical fiber line that meet the preset condition. Without additional equipment cost, the signal interference can be effectively removed, thereby improving the detection accuracy and reducing the false alarm rate.

[0121] The communication bus can be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.

[0122] The communication interface is used for communication between the terminal and other devices.

[0123] The memory can include a RAM (Random Access Memory) and can also include a non-volatile memory such as at least one disk memory. Optionally, the memory can also be at least one storage device located remotely from the aforementioned processor.

[0124] The aforementioned processor can be a general-purpose processor including a CPU (Central Processing Unit), an NP (Network Processor), etc., and can also be a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0125] In yet another embodiment provided by the present application, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the voice synthesis method as described above.

[0126] In yet another embodiment provided by the present application, a computer program product containing instructions, which when run on a computer, causes the computer to execute the voice synthesis method as described above.

[0127] In the embodiments described above, all or some of the steps can be implemented by software, hardware or firmware, or any combination thereof. When implemented by software, all or some of the steps can be implemented in the form of one or more computer programs. The computer program can be stored in any computer readable medium, and loaded into the computer for execution. The computer readable medium includes computer storage media and communication media. The computer storage media includes any tangible or physical medium for storing or transmitting the program. The computer storage media can be a volatile (such as RAM) or non-volatile (such as ROM, disk, or CD) storage medium. The communication media typically include 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 includes any information delivery media.

[0128] It should be noted that, in the present document, the terms such as first and second are used only to differentiate one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Also, the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed, or other elements inherent in such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0129] Each of the embodiments in the present document is described in a related manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments.

[0130] The above only describes the preferred embodiments of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting optical cable deformation, applied in an optical cable deformation fencing system, characterized in that, include: Multiple detection pulse signals are sequentially injected into the monitored optical fiber line at a preset frequency, and the backscattered signal corresponding to each detection pulse signal is acquired. Generate a signal intensity curve for the backscattered signal, the intensity curve containing the correspondence between the length of the optical fiber line and the signal intensity of each backscattered signal; The signal strength variation value at each location of the optical fiber line is determined based on the signal strength curve. The signal intensity variation value is determined based on the signal intensity variation curve of adjacent backscattered signals; Sequentially determine whether the signal intensity change value of the signal point corresponding to each position and the signal intensity of the backscattered signal meet the preset conditions; The number of locations in the optical fiber line that meet the preset conditions is used to determine whether an alarm needs to be issued for the optical fiber line. The signal intensity change value and the signal intensity of the backscattered signal at each location are sequentially determined to meet preset conditions, specifically: Sequentially determine whether the signal strength change value corresponding to each position is greater than a preset signal change threshold, and determine whether the signal strength is greater than a preset strength threshold; The locations where the signal intensity change value is greater than the preset signal change threshold and the signal intensity is greater than the preset intensity threshold are marked as special points; The signal intensity variation curve for generating the backscattered signal is as follows: The backscattered signals are accumulated. The signal intensity variation curve is generated based on the accumulated backscattered signal; The coordinate axes of the signal intensity variation curve are the intensity of the backscattered signal and the length of the optical fiber line, respectively. Based on the signal strength variation curve, the signal strength variation value at each location of the optical fiber line is determined as follows: The intensity variation curve of the backscattered signal is subtracted from the intensity variation curve of the previous backscattered signal. The absolute value of the intensity subtraction result is used to generate a signal intensity change curve for each location. The absolute value of the intensity subtraction result is used to generate a signal intensity change curve for each location, specifically: Using the signal intensity change of the backscattered signal at the starting position of the optical fiber line as a reference value, the signal intensity change data of the backscattered signal in the optical fiber line is zeroed out. Whether an alarm needs to be issued for the optical fiber line is determined based on the number of locations in the optical fiber line that meet the preset conditions. Specifically: Obtain the product of the number of the special points and the fiber length coordinate interval between two adjacent points in the signal intensity change curve; If the ratio of the product value to the pulse width of the detection pulse signal is greater than a preset detection threshold, an alarm is issued for the optical fiber line. If the ratio of the product value to the pulse width of the detection pulse signal is not greater than the preset detection threshold, multiple detection pulse signals are continuously injected into the monitored optical fiber line at a preset frequency.

2. The method as described in claim 1, characterized in that, Multiple detection pulse signals are sequentially injected into the monitored fiber optic line according to a preset frequency, specifically as follows: According to the time interval corresponding to the preset frequency, the detection pulse signal corresponding to the pulse width is repeatedly injected into the optical fiber line until the number of injections reaches the threshold number corresponding to the preset frequency.

3. A device for detecting optical cable deformation, characterized in that, The apparatus, used in the method of any one of claims 1 to 2, comprises: The signal processing module sequentially injects multiple detection pulse signals into the monitored optical fiber line according to a preset frequency, and acquires the backscattered signal corresponding to each detection pulse signal. The signal strength module generates the signal strength curve of the backscattered signal, and the intensity curve includes the correspondence between the length of the optical fiber line and the signal strength of each backscattered signal; The signal strength variation module determines the signal strength variation value at each location of the optical fiber line based on the signal strength curve; the signal strength variation value is determined based on the signal strength variation curve of adjacent backscattered signals. The judgment module sequentially judges whether the signal strength change value of the signal point corresponding to each position and the signal strength of the backscattered signal meet the preset conditions. The alarm module determines whether an alarm needs to be issued for the optical fiber line based on the number of locations in the optical fiber line that meet the preset conditions.

4. An electronic device, characterized in that, include: processor; as well as Memory for storing the executable instructions of the processor; The processor is configured to execute the optical cable deformation detection method according to any one of claims 1 to 2 by executing the executable instructions.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the optical cable deformation detection method according to any one of claims 1 to 2.

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