Method, device and system for testing distortion degree of optical fiber sensing signal

Abstract

The embodiment of the invention provides an optical fiber sensing signal distortion degree testing method, device and system. The test method comprises the following steps: determining test times, and determining a dynamic strain excitation signal for each test; determining a time domain signal of the to-be-measured optical fiber under each dynamic strain excitation signal; performing frequency spectrum transformation on each time domain signal to determine a frequency spectrum corresponding to each time domain signal; accumulating and averaging all the frequency spectrums to generate an average spectrogram; determining the total harmonic distortion degree of the to-be-measured optical fiber based on the average spectrogram; and under the condition that the total harmonic distortion degree is smaller than or equal to a preset value, determining that the sensing signal distortion degree of the to-be-detected optical fiber meets the standard requirement. According to the method, the distortion degree of the optical fiber sensing signal is accurately measured.

Description

Technical Field

[0001] The present application relates to the field of optical fiber sensing technology, and in particular to a method, device, system and storage medium for testing the distortion of an optical fiber sensing signal. Background Art

[0002] Fiber optic sensing technology is widely used in monitoring and detection applications, especially in structural health monitoring, earthquake monitoring, oil exploration and other fields. However, most existing fiber optic sensing devices rely on intensity sensing (DVS). This method has a nonlinear relationship between the signal and the external vibration signal, which makes it impossible to accurately restore the external vibration information. In addition, due to the polarization fading and coherent fading effects in the fiber optic sensing system, the signal-to-noise ratio will deteriorate sharply, resulting in signal distortion and detection blind spots during the monitoring process. The traditional test method faces the following main problems: (1) The restoration accuracy is limited by the calculation method of the sine waveform distortion. When the intermediate frequency signal is interfered by noise or the signal itself has a high distortion, the restored vibration signal will have a large error. (2) It relies on the processing process of the beat frequency signal, which cannot effectively solve the noise problem caused by polarization fading and coherent fading effects, resulting in the difficulty in ensuring the quality of the restored signal. (3) No effective phase distortion test method is introduced, and the total harmonic distortion is not fully considered and eliminated, which affects the accuracy and reliability of the final signal. Therefore, there is an urgent need for a test method that can accurately measure the distortion of fiber optic sensing signals. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method, device, system and storage medium for testing the distortion of an optical fiber sensor signal, so as to solve the technical defect that the distortion of an optical fiber sensor signal cannot be accurately measured in the prior art.

[0004] In order to achieve the above-mentioned object, the first aspect of the present application provides a method for testing the distortion of an optical fiber sensing signal, the testing method comprising:

[0005] Determine the number of tests and determine the dynamic strain excitation signal used for each test;

[0006] Determine the time domain signal of the optical fiber under test under each dynamic strain excitation signal;

[0007] Performing spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal;

[0008] All the spectra are accumulated and averaged to generate an average spectrum graph;

[0009] Determine the total harmonic distortion of the optical fiber under test based on the average spectrum diagram;

[0010] When the total harmonic distortion is less than or equal to a preset value, it is determined that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0011] In an embodiment of the present application, performing a spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal includes: performing a spectrum transformation on each time domain signal to convert each time domain signal into a corresponding frequency domain signal; and determining the spectrum corresponding to each time domain signal based on the frequency domain signal.

[0012] In an embodiment of the present application, the testing method further includes: when the total harmonic distortion is greater than a preset value, determining that the distortion of the sensing signal of the optical fiber to be tested does not meet the specification requirements.

[0013] In an embodiment of the present application, accumulating and averaging all spectra to generate an average spectrum diagram includes: determining an average amplitude value of the frequency point for any frequency point in each spectrum; and generating the average spectrum diagram based on each frequency point and the average amplitude value corresponding to each frequency point.

[0014] In an embodiment of the present application, determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum graph includes: for the average spectrum graph, obtaining a first harmonic frequency point in the average spectrum graph whose frequency is within a first preset frequency range and a second harmonic frequency point in the average spectrum graph whose frequency is within a second preset frequency range; and determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency point and the second harmonic frequency point.

[0015] In an embodiment of the present application, determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency and the second harmonic frequency includes: determining the sum of squares of the first harmonic frequency; and determining the ratio of the sum of squares to the second harmonic frequency to determine the total harmonic distortion of the optical fiber to be tested.

[0016] In an embodiment of the present application, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining the dynamic strain excitation signal for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain the dynamic strain excitation signal for each test.

[0017] A second aspect of the present application provides a device for testing the distortion of an optical fiber sensing signal, comprising:

[0018] a memory configured to store instructions;

[0019] The processor is configured to call the instructions from the memory and implement the above-mentioned method for testing the distortion of optical fiber sensing signals when executing the instructions.

[0020] The third aspect of the present application provides a system for testing the distortion of an optical fiber sensing signal, comprising:

[0021] The optical fiber to be tested;

[0022] The above-mentioned test device for the distortion of optical fiber sensing signals.

[0023] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configures the processor to execute the above-mentioned method for testing the distortion of an optical fiber sensing signal.

[0024] The above technical scheme determines the number of tests and the dynamic strain excitation signal used for each test; determines the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; performs spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal; accumulates and averages all the spectra to generate an average spectrum diagram; determines the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram; and when the total harmonic distortion is less than or equal to a preset value, determines that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements, thereby achieving accurate measurement of the distortion of the optical fiber sensing signal.

[0025] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of a process of testing a distortion degree of an optical fiber sensing signal according to an embodiment of the present application is shown;

[0028] Figure 2 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, 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. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] Figure 1 The flowchart of a method for testing the distortion of an optical fiber sensing signal according to an embodiment of the present application is schematically shown. Figure 1 As shown, an embodiment of the present application provides a method for testing the distortion of an optical fiber sensing signal. The testing method may include the following steps.

[0033] Step 101, determining the number of tests and determining a dynamic strain excitation signal for each test.

[0034] In the embodiments of the present application, it should be noted that the number of tests can be set according to actual needs in combination with empirical values, for example, it can include but is not limited to being set to 10 times. The dynamic strain excitation signal refers to a specific signal used in dynamic strain measurement, which is used to stimulate and record the strain response of a material or structure under a dynamic load. The dynamic strain excitation signal generally includes different types of signals, each of which has its specific application scenarios and characteristics, for example, it may include sinusoidal signals, square wave signals, pulse signals, Gaussian signals, and random signals. After setting the number of tests, the dynamic strain excitation signal used for each test can be further determined, which may include the number, type, frequency, and amplitude of the dynamic strain excitation signal. For example, in the present technical solution, the dynamic strain excitation signal used for each test can be set to a single-tone sinusoidal signal with a signal frequency of 100 Hz and a signal amplitude of 100 nε.

[0035] Step 102: determine the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0036] In the embodiments of the present application, it should be noted that the time domain signal may refer to the characteristics of the signal that change over time, such as sound, image, and video. In the time domain, the amplitude and frequency of the signal change over time, usually represented by a waveform. In the present technical solution, for each test, after determining the dynamic strain excitation signal of each test, the time domain signal of the optical fiber under each dynamic strain excitation signal can be further determined.

[0037] In an embodiment of the present application, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining the dynamic strain excitation signal for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain the dynamic strain excitation signal for each test.

[0038] In this embodiment, it should be noted that the piezoelectric ceramic sensor may refer to PZT, which may also be called a piezoelectric ceramic fiber stretcher or a fiber stretcher. The piezoelectric ceramic sensor is a sensor that converts mechanical energy into electrical energy using the piezoelectric effect. PZT piezoelectric ceramics will produce charge changes under the action of external forces. This phenomenon is called the piezoelectric effect. In this technical solution, the optical fiber to be tested can be wound around the piezoelectric ceramic sensor, and then a driving voltage signal is output to the piezoelectric ceramic sensor through a signal generator to obtain a dynamic strain excitation signal applied by the piezoelectric ceramic sensor to the optical fiber to be tested.

[0039] It should be noted that a central sampling position is provided in the technical solution, for example, a position on the optical fiber 1km, 25km, 50km, etc., away from the piezoelectric ceramic sensor can be selected as the central sampling position. After the piezoelectric ceramic sensor applies a dynamic strain excitation signal, the signal at the central sampling position is obtained, and the signal is determined as the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0040] Step 103: Perform spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal.

[0041] In the embodiments of the present application, it should be noted that spectrum conversion can refer to a technique for decomposing a complex signal into simpler signals, and finding out information (such as amplitude, power, intensity or phase, etc.) of the signal at different frequencies through spectrum analysis. Therefore, in the present technical solution, after obtaining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal, the spectrum corresponding to each time domain signal can be obtained through spectrum conversion.

[0042] In an embodiment of the present application, performing a spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal includes: performing a spectrum transformation on each time domain signal to convert each time domain signal into a corresponding frequency domain signal; and determining the spectrum corresponding to each time domain signal based on the frequency domain signal.

[0043] In this embodiment, it should be noted that the core of spectrum transformation is to convert a time domain signal into the frequency domain through Fourier transform to obtain a spectrum. In this technical solution, after obtaining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal, each Fourier transform can be converted into a corresponding frequency domain signal through spectrum transformation, thereby obtaining the spectrum corresponding to each time domain signal based on the frequency domain signal.

[0044] Step 104: All frequency spectra are accumulated and averaged to generate an average frequency spectrum graph.

[0045] In the embodiment of the present application, it should be noted that after obtaining the spectrum of the optical fiber to be tested in each test, all the spectra can be further accumulated and averaged to generate an average spectrum graph. Taking the number of tests as 10 times as an example, the spectra under the 10 tests can be accumulated and averaged to obtain the average spectrum graph of the 10 tests.

[0046] In the embodiment of the present application, all the spectra are accumulated and averaged to generate an average spectrum diagram, including: determining the average amplitude value of the frequency point for any frequency point in each spectrum; and generating the average spectrum diagram based on each frequency point and the average amplitude value corresponding to each frequency point.

[0047] In this embodiment, it should be noted that after obtaining the spectrum corresponding to each time domain signal, for any frequency point in each spectrum, the amplitude values ​​at the same frequency can be accumulated and then divided by the number of tests to obtain the average amplitude value of the frequency point, and the spectrum diagram is drawn according to the average amplitude value of each frequency point, so that the average spectrum diagram can be obtained. Specifically, taking the number of tests as 10 times as an example, for each frequency point, the amplitude values ​​at the same frequency obtained by 10 measurements are accumulated. Assuming that the spectrum has many discrete frequency points on the frequency axis, there is an amplitude value for each frequency point (such as ω), and the amplitude values ​​of this frequency point in the 10 measurements are accumulated in turn. The accumulated sum of each frequency point is divided by 10 to obtain the average amplitude value of the frequency point, and the spectrum diagram is drawn according to the average amplitude value of each frequency point, so that the average spectrum diagram is obtained.

[0048] Step 105: Determine the total harmonic distortion of the optical fiber to be tested based on the average spectrum.

[0049] In the embodiments of the present application, it should be noted that harmonic distortion (THD) refers to the phenomenon that in electronic equipment, the waveform of voltage or current contains harmonic components of different frequencies, resulting in the output signal being out of sync with the input signal, distorted or distorted. Harmonic distortion is mainly caused by the nonlinear characteristics of electronic components or circuits themselves. When signals of different frequencies are mixed together, various harmonic components will be generated, and the proportional relationship between these harmonic components and the original signal will change, resulting in distortion of the output signal and the input signal. In the present technical solution, after obtaining the average spectrum diagram, the total harmonic distortion of the optical fiber to be tested can be further determined based on the average spectrum diagram.

[0050] In an embodiment of the present application, determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum graph includes: for the average spectrum graph, obtaining a first harmonic frequency point in the average spectrum graph whose frequency is within a first preset frequency range and a second harmonic frequency point in the average spectrum graph whose frequency is within a second preset frequency range; and determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency point and the second harmonic frequency point.

[0051] In this embodiment, it should be noted that, in this technical solution, the average frequency spectrum obtained may include harmonic frequencies such as the fundamental frequency, the 2nd order harmonic frequency, the 3rd order harmonic frequency: 3×f1, the 4th order harmonic frequency: 4×f1 and the 5th order harmonic frequency, the first preset frequency range may refer to the range from the 2nd order harmonic frequency to the 5th order harmonic frequency, and the second preset frequency range may refer to the range below the 2nd order harmonic frequency. Therefore, based on the average frequency spectrum, it can be obtained that the first harmonic frequency includes the 2nd order harmonic frequency: 2×f1, the 3rd order harmonic frequency: 3×f1, the 4th order harmonic frequency: 4×f1 and the 5th order harmonic frequency: 5×f1, the second harmonic frequency includes the fundamental frequency: f1, and the total harmonic distortion of the optical fiber to be tested is further calculated based on these harmonic frequencies.

[0052] In the embodiment of the present application, determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency and the second harmonic frequency includes: determining the sum of squares of the first harmonic frequency; and determining the ratio of the sum of squares to the second harmonic frequency to determine the total harmonic distortion of the optical fiber to be tested.

[0053] In this embodiment, after obtaining that the first harmonic frequency includes the 2nd order harmonic frequency: 2×f1, the 3rd order harmonic frequency: 3×f1, the 4th order harmonic frequency: 4×f1 and the 5th order harmonic frequency: 5×f1, and the second harmonic frequency includes the fundamental frequency: f1, the square sum of the first harmonic frequency can be calculated first, and then the ratio of the square sum to the second harmonic frequency can be calculated to obtain the total harmonic distortion of the optical fiber to be tested. Specifically, the total harmonic distortion can be calculated according to the following formula, including:

[0054]

[0055] Among them, THD is the total harmonic distortion, V2, V3, V4, V5 are the first harmonic frequency points, and V1 is the second harmonic frequency point.

[0056] Step 106: When the total harmonic distortion is less than or equal to a preset value, it is determined that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0057] In the embodiment of the present application, it should be noted that the preset value can be set according to actual needs in combination with the empirical value. For example, in the present technical solution, it can include but is not limited to being set to 5%. Specifically, after obtaining the total harmonic distortion, it is determined whether the total harmonic distortion is less than or equal to 5%. If the harmonic distortion is less than or equal to 5%, it can be considered that the distortion of the sensor signal of the optical fiber to be tested meets the specification requirements.

[0058] In an embodiment of the present application, the testing method further includes: when the total harmonic distortion is greater than a preset value, determining that the distortion of the sensing signal of the optical fiber to be tested does not meet the specification requirements.

[0059] In this embodiment, taking the preset value of 5% as an example, after obtaining the total harmonic distortion, it is determined whether the total harmonic distortion is less than or equal to 5%. If the harmonic distortion is greater than 5%, it can be considered that the distortion of the sensor signal of the optical fiber to be tested does not meet the specification requirements.

[0060] The above technical scheme determines the number of tests and the dynamic strain excitation signal used for each test; determines the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; performs spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal; accumulates and averages all the spectra to generate an average spectrum diagram; determines the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram; and when the total harmonic distortion is less than or equal to a preset value, determines that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements, thereby achieving accurate measurement of the distortion of the optical fiber sensing signal.

[0061] This technical solution, through high-fidelity position restoration technology and the realization of ultra-spatial dynamic range, solves the problems of nonlinear distortion, signal-to-noise ratio degradation and monitoring blind spots in the existing technology, and improves the signal accuracy and reliability of the optical fiber sensing system. Specific effects include:

[0062] (1) Reduce reflection interference: Optimize the optical fiber structure and connection process, significantly reduce the reflection interference in the optical fiber, and fundamentally improve the purity of the sensor signal.

[0063] (2) Improve signal stability: The use of advanced signal processing algorithms can effectively filter out reflection interference and improve the stability and accuracy of sensor signals.

[0064] (3) Improve measurement accuracy: By reducing reflection interference and signal distortion, the measurement accuracy of the fiber optic sensing system can be significantly improved to meet high-precision measurement requirements.

[0065] (4) Reduce system complexity: Simplify system design, reduce system complexity and cost, and improve practicality.

[0066] This technical solution is applicable to various types of optical fiber sensing systems, especially to areas that require high-precision and high-reliability monitoring. Typical application scenarios include but are not limited to:

[0067] (1) Structural health monitoring: long-term health status monitoring of important structures such as bridges, buildings, and wind turbine towers.

[0068] (2) Earthquake monitoring: It is used for real-time monitoring of earthquake activities and tracking of changes in geological structures, which helps to provide early warning and reduce disaster risks.

[0069] (3) Oil Exploration: In oil field exploration, fiber optic sensing systems are used to monitor underground structures and reservoir conditions with high precision to optimize exploration and production operations.

[0070] (4) Slope monitoring: used for real-time monitoring of slope stability, timely detection of geological disaster risks and taking preventive measures.

[0071] (5) Tunnel monitoring: Long-term monitoring of internal tunnel structural changes, stress conditions, and environmental conditions to ensure safe tunnel operation.

[0072] With the continuous advancement and application expansion of fiber optic sensing technology, the high-fidelity position restoration and ultra-spatial dynamic range technology proposed by this technology has the following significant application prospects:

[0073] (1) Improving monitoring accuracy and reliability: The technical solution of this patent significantly improves the data acquisition accuracy of the fiber optic sensing system and the accuracy of the monitoring signal by improving the phase restoration and dynamic range testing methods. It is suitable for all kinds of scenarios with high requirements for data accuracy.

[0074] (2) Promote the application of sensing systems in key areas: Key areas such as structural health monitoring and earthquake monitoring require extremely high accuracy and timeliness of monitoring data. The application of this patented technology will promote the widespread application of fiber optic sensing systems in these areas.

[0075] (3) Broad market potential: Fiber optic sensing technology has broad market demand in the fields of infrastructure monitoring, environmental monitoring, industrial automation, etc. The technical solution of this patent not only improves system performance, but also helps to reduce operating costs and increase equipment life. Therefore, it has broad market prospects and commercial application potential.

[0076] In summary, the innovation and application prospects of this technical solution will bring significant technological progress and commercial value in many fields, and promote the further development and application expansion of fiber optic sensing technology on a global scale.

[0077] The present application provides a device for testing the distortion of an optical fiber sensing signal, comprising:

[0078] a memory configured to store instructions;

[0079] The processor is configured to call the instructions from the memory and implement the above-mentioned method for testing the distortion of optical fiber sensing signals when executing the instructions.

[0080] The present application provides a system for testing the distortion of optical fiber sensing signals, including:

[0081] The optical fiber to be tested;

[0082] The above-mentioned test device for the distortion of optical fiber sensing signals.

[0083] An embodiment of the present application provides a readable storage medium having a program stored thereon, and when the program is executed by a processor, the above-mentioned method for testing the distortion of an optical fiber sensing signal is implemented.

[0084] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 2 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown in the figure) and a database (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02 and a database (not shown in the figure). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A04. The database of the computer device is used to store test method data for the distortion of optical fiber sensor signals. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program B02 is executed by the processor A01, a test method for the distortion of optical fiber sensor signals is implemented.

[0085] Those skilled in the art will understand that Figure 2 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0086] An embodiment of the present application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: determining the number of tests and determining a dynamic strain excitation signal for each test; determining a time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; performing a spectrum transformation on each time domain signal to determine a spectrum corresponding to each time domain signal; accumulating and averaging all the spectra to generate an average spectrum diagram; determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram; and determining that the distortion of the sensing signal of the optical fiber to be tested meets specification requirements when the total harmonic distortion is less than or equal to a preset value.

[0087] In one embodiment, performing a spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal includes: performing a spectrum transformation on each time domain signal to convert each time domain signal into a corresponding frequency domain signal; and determining the spectrum corresponding to each time domain signal based on the frequency domain signal.

[0088] In one embodiment, the testing method further includes: when the total harmonic distortion is greater than a preset value, determining that the distortion of the sensing signal of the optical fiber to be tested does not meet the specification requirements.

[0089] In one embodiment, accumulating and averaging all the frequency spectra to generate an average spectrum graph includes: determining an average amplitude value of the frequency point for any frequency point in each spectrum; and generating the average spectrum graph based on each frequency point and the average amplitude value corresponding to each frequency point.

[0090] In one embodiment, determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum graph includes: for the average spectrum graph, obtaining a first harmonic frequency point in the average spectrum graph whose frequency is within a first preset frequency range and a second harmonic frequency point in the average spectrum graph whose frequency is within a second preset frequency range; and determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency point and the second harmonic frequency point.

[0091] In one embodiment, determining the total harmonic distortion of the optical fiber under test based on the first harmonic frequency and the second harmonic frequency includes: determining the square sum of the first harmonic frequency; and determining the ratio of the square sum to the second harmonic frequency to determine the total harmonic distortion of the optical fiber under test.

[0092] In one embodiment, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining the dynamic strain excitation signal for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain the dynamic strain excitation signal for each test.

[0093] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: determining the number of tests and determining the dynamic strain excitation signal used for each test; determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; performing spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal; accumulating and averaging all the spectra to generate an average spectrum diagram; determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram; and determining that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements when the total harmonic distortion is less than or equal to a preset value.

[0094] In one embodiment, performing a spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal includes: performing a spectrum transformation on each time domain signal to convert each time domain signal into a corresponding frequency domain signal; and determining the spectrum corresponding to each time domain signal based on the frequency domain signal.

[0095] In one embodiment, the testing method further includes: when the total harmonic distortion is greater than a preset value, determining that the distortion of the sensing signal of the optical fiber to be tested does not meet the specification requirements.

[0096] In one embodiment, accumulating and averaging all the frequency spectra to generate an average spectrum graph includes: determining an average amplitude value of the frequency point for any frequency point in each spectrum; and generating the average spectrum graph based on each frequency point and the average amplitude value corresponding to each frequency point.

[0097] In one embodiment, determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum graph includes: for the average spectrum graph, obtaining a first harmonic frequency point in the average spectrum graph whose frequency is within a first preset frequency range and a second harmonic frequency point in the average spectrum graph whose frequency is within a second preset frequency range; and determining the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency point and the second harmonic frequency point.

[0098] In one embodiment, determining the total harmonic distortion of the optical fiber under test based on the first harmonic frequency and the second harmonic frequency includes: determining the square sum of the first harmonic frequency; and determining the ratio of the square sum to the second harmonic frequency to determine the total harmonic distortion of the optical fiber under test.

[0099] In one embodiment, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining the dynamic strain excitation signal for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain the dynamic strain excitation signal for each test.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0101] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0105] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0106] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0107] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0108] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for testing the distortion of optical fiber sensing signals, characterized in that: The test method includes: Determine the number of tests and determine the dynamic strain excitation signal used for each test; Determine the time domain signal of the optical fiber under test under each dynamic strain excitation signal; Performing spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal; All the spectra are accumulated and averaged to generate an average spectrum graph; Determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram; When the total harmonic distortion is less than or equal to a preset value, it is determined that the distortion of the sensing signal of the optical fiber to be tested meets the specification requirements.

2. The method for testing the distortion of optical fiber sensing signals according to claim 1, characterized in that: The performing spectrum transformation on each time domain signal to determine the spectrum corresponding to each time domain signal comprises: Performing spectrum transformation on each time domain signal to convert each time domain signal into a corresponding frequency domain signal; The frequency spectrum corresponding to each time domain signal is determined based on the frequency domain signal.

3. The method for testing the distortion of optical fiber sensing signals according to claim 1, characterized in that: The test method also includes: When the total harmonic distortion is greater than the preset value, it is determined that the distortion of the sensing signal of the optical fiber to be tested does not meet the specification requirements.

4. The method for testing the distortion of optical fiber sensing signals according to claim 1, characterized in that: The step of accumulating and averaging all the frequency spectra to generate an average frequency spectrum diagram comprises: For any frequency point in each spectrum, determine the average amplitude value of the frequency point; The average frequency spectrum is generated based on each frequency point and the average amplitude value corresponding to each frequency point.

5. The method for testing the distortion of optical fiber sensing signals according to claim 1, characterized in that: Determining the total harmonic distortion of the optical fiber to be tested based on the average spectrum diagram includes: For the average spectrum graph, obtaining a first harmonic frequency point whose frequency is within a first preset frequency range and a second harmonic frequency point whose frequency is within a second preset frequency range in the average spectrum graph; The total harmonic distortion of the optical fiber to be tested is determined based on the first harmonic frequency point and the second harmonic frequency point.

6. The method for testing the distortion of optical fiber sensing signals according to claim 5, characterized in that: The determining of the total harmonic distortion of the optical fiber to be tested based on the first harmonic frequency point and the second harmonic frequency point comprises: Determine the square sum of the first harmonic frequencies; The ratio of the square sum to the second harmonic frequency is determined to determine the total harmonic distortion of the optical fiber to be tested.

7. The method for testing the distortion of optical fiber sensing signals according to claim 1, characterized in that: The optical fiber to be tested is wound on a piezoelectric ceramic sensor, and the dynamic strain excitation signal for each test is determined to include: A driving voltage signal is output to the piezoelectric ceramic sensor to obtain a dynamic strain excitation signal for each test.

8. A device for testing the distortion of optical fiber sensing signals, characterized in that: include: a memory configured to store instructions; A processor is configured to call the instruction from the memory and implement the method for testing the distortion of an optical fiber sensing signal according to any one of claims 1 to 7 when executing the instruction.

9. A system for testing the distortion of optical fiber sensing signals, characterized in that: include: The optical fiber to be tested; The device for testing the distortion of optical fiber sensing signals according to claim 8.

10. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the method for testing the distortion of an optical fiber sensing signal according to any one of claims 1 to 7.

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