Method, device and system for testing dynamic range of optical fiber sensing signal

Abstract

The embodiment of the invention provides a method, a device and a system for testing the dynamic range of an optical fiber sensing signal. The test method comprises the following steps: determining test times, and determining a plurality of dynamic strain excitation signals for each test; for each test, determining a time domain signal of the to-be-tested optical fiber under each dynamic strain excitation signal; determining the power spectrum density corresponding to each time domain signal; determining a phase signal test value of the to-be-tested optical fiber under each power spectral density to obtain a maximum phase signal test value and a minimum phase signal test value; determining a signal dynamic range test value of the to-be-tested optical fiber under each test based on the maximum phase signal test value and the minimum phase signal test value of each test; and under the condition that the signal dynamic range test value meets a preset condition, determining that the sensing signal dynamic range of the to-be-tested optical fiber meets a standard requirement. According to the method, accurate measurement of the dynamic range of the optical fiber sensing signal is realized.

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 dynamic range of an optical fiber sensing signal. Background Art

[0002] Existing fiber optic sensing technologies mainly rely on DVS (distributed vibration sensing) and traditional OTDR (optical time domain reflectometer) systems. However, these technologies face the following major problems in long-distance sensing and high-precision monitoring: (1) Nonlinear relationship: There is a nonlinear relationship between the DVS signal and the external vibration signal, which makes it impossible to accurately restore the external vibration information. (2) Signal-to-noise ratio degradation: In long-distance sensing, effects such as polarization fading and coherent fading can cause the signal-to-noise ratio to drop sharply, resulting in randomly distributed monitoring dead zones and the inability to identify events. (3) Phase jump distortion: The fading effect causes the phase jump distortion to be irreversible, affecting the number of effective sampling points, thereby reducing the accuracy of event discrimination. (4) Limited dynamic range: The dynamic range of existing systems is small and cannot accurately monitor and respond within a wide range of signals. Therefore, there is an urgent need for a test method that can accurately measure the dynamic range 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 dynamic range of an optical fiber sensor signal, so as to solve the technical defect in the prior art that the dynamic range of an optical fiber sensor signal cannot be accurately measured.

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

[0005] determining the number of tests and determining a plurality of dynamic strain excitation signals for each test;

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

[0007] Determine the power spectral density corresponding to each time domain signal;

[0008] Determine the phase signal test value of the optical fiber to be tested at each power spectrum density to obtain a maximum phase signal test value and a minimum phase signal test value;

[0009] Determine the signal dynamic range test value of the optical fiber under test in each test based on the maximum phase signal test value and the minimum phase signal test value of each test;

[0010] When the signal dynamic range test value meets the preset conditions, it is determined that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0011] In an embodiment of the present application, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining multiple dynamic strain excitation signals for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain multiple dynamic strain excitation signals for each test.

[0012] In an embodiment of the present application, for any test, the signal type and signal frequency of each dynamic strain excitation signal under the test are the same, the signal amplitudes of the multiple dynamic strain excitation signals under the test are all within a preset amplitude range and the signal amplitudes of any two dynamic strain excitation signals are different; the same multiple dynamic strain excitation signals are used between different tests.

[0013] In an embodiment of the present application, the testing method also includes: determining that the signal dynamic range test value meets the preset condition when the following conditions are met: the number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold is greater than or equal to the preset number of times and the signal dynamic range test value under each test is greater than the minimum threshold.

[0014] In an embodiment of the present application, for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal includes: determining the central sampling position for the optical fiber to be tested; acquiring the signal of the central sampling position under each dynamic strain excitation signal to determine the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0015] In an embodiment of the present application, determining the power spectrum density corresponding to each time domain signal includes: converting each time domain signal into a corresponding frequency domain signal; and determining the power spectrum density corresponding to each time domain signal based on the frequency domain signal.

[0016] In an embodiment of the present application, determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test includes: for each test, determining the ratio of the maximum phase signal test value and the minimum phase signal test value of each test; performing a logarithmic operation on each ratio to obtain a result after the operation; and weighting each calculated ratio to obtain the signal dynamic range test value of the optical fiber to be tested under each test.

[0017] A second aspect of the present application provides a device for testing the dynamic range 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 dynamic range of the optical fiber sensing signal when executing the instructions.

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

[0021] The optical fiber to be tested;

[0022] The above-mentioned test device for the dynamic range of the optical fiber sensing signal.

[0023] A fourth aspect of the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned method for testing the dynamic range of an optical fiber sensing signal.

[0024] The above technical scheme determines the number of tests and determines multiple dynamic strain excitation signals for each test; for each test, determines the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; determines the power spectrum density corresponding to each time domain signal; determines the phase signal test value of the optical fiber to be tested under each power spectrum density to obtain the maximum phase signal test value and the minimum phase signal test value; determines the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test; when the signal dynamic range test value meets the preset conditions, determines that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements, thereby realizing accurate measurement of the dynamic range 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 dynamic range of an optical fiber sensing signal according to an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram of optical fiber winding according to an embodiment of the present application is schematically shown;

[0029] Figure 3 The internal structure diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Figure 1 The following is a schematic diagram of a method for testing the dynamic range of an optical fiber sensing signal according to an embodiment of the present application. Figure 1 As shown, an embodiment of the present application provides a method for testing the dynamic range of an optical fiber sensing signal, and the testing method may include the following steps.

[0034] Step 101, determining the number of tests and determining a plurality of dynamic strain excitation signals for each test.

[0035] 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 5 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 multiple dynamic strain excitation signals used for each test can be further determined, which may include the number, type, frequency, and amplitude of the dynamic strain excitation signals.

[0036] In an embodiment of the present application, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining multiple dynamic strain excitation signals for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain multiple dynamic strain excitation signals for each test.

[0037] 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 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, if Figure 2 As shown, the optical fiber to be tested can be wound around the piezoelectric ceramic sensor, and then a signal generator outputs a driving voltage signal to the piezoelectric ceramic sensor to obtain multiple dynamic strain excitation signals applied by the piezoelectric ceramic sensor to the optical fiber to be tested.

[0038] In an embodiment of the present application, for any test, the signal type and signal frequency of each dynamic strain excitation signal under the test are the same, the signal amplitudes of the multiple dynamic strain excitation signals under the test are all within a preset amplitude range and the signal amplitudes of any two dynamic strain excitation signals are different; the same multiple dynamic strain excitation signals are used between different tests.

[0039] In this embodiment, it should be noted that in any test, the signal type and signal frequency of each dynamic strain excitation signal are the same. Specifically, in the present technical solution, each dynamic strain excitation signal can be set to a single-tone sine signal with a signal frequency of 100 Hz. At the same time, the signal amplitude of each dynamic strain excitation signal should be within the preset amplitude range of the dynamic strain excitation signal. For example, the preset amplitude range can be set to 0.2nε~500nε, that is, the signal amplitude of each dynamic strain excitation signal should be a value in the range of 0.2nε~500nε. For the convenience of calculation, the signal amplitude of the dynamic strain excitation signal can be set to start from 0.2nε, increase by 10nε each time, until 500nε is cut off, so as to obtain multiple dynamic strain excitation signals with different signal amplitudes and the same growth value between adjacent signals.

[0040] It should be noted that the same multiple dynamic strain excitation signals are used between different tests. Taking the number of tests as 5 times as an example, assuming that the multiple dynamic strain excitation signals in the first test are a single-tone sinusoidal signal with an amplitude of 0.2nε and a signal frequency of 100Hz, a single-tone sinusoidal signal with an amplitude of 10.2nε and a frequency of 100Hz, and a single-tone sinusoidal signal with an amplitude of 20.2nε and a signal frequency of 100Hz, then the multiple dynamic strain excitation signals used in the second to fifth tests should be the same as the multiple dynamic strain excitation signals used in the first test, that is, they are all single-tone sinusoidal signals with an amplitude of 0.2nε and a signal frequency of 100Hz, single-tone sinusoidal signals with an amplitude of 10.2nε and a frequency of 100Hz, and single-tone sinusoidal signals with an amplitude of 20.2nε and a signal frequency of 100Hz.

[0041] Step 102: for each test, determine the time domain signal of the optical fiber under test under each dynamic strain excitation signal.

[0042] 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 multiple dynamic strain excitation signals for each test, the time domain signal of the optical fiber under each dynamic strain excitation signal can be further determined.

[0043] In an embodiment of the present application, for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal includes: determining the central sampling position for the optical fiber to be tested; acquiring the signal of the central sampling position under each dynamic strain excitation signal to determine it as the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0044] In this embodiment, it should be noted that the central sampling position can be set according to actual needs combined with empirical values. For example, the positions on the optical fiber that are 1 km, 25 km, 50 km away from the piezoelectric ceramic sensor can be selected as the central sampling position, and 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.

[0045] Step 103: determine the power spectrum density corresponding to each time domain signal.

[0046] In the embodiments of the present application, it should be noted that the signal is usually expressed in the form of a wave, such as an electromagnetic wave, a random vibration or a sound wave. When the power spectrum density of the wave is multiplied by an appropriate coefficient, the power carried by the wave per unit frequency is obtained, which is called the power spectrum density of the signal, also known as the PSD spectrum. In the present technical solution, after determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal under each test, the time domain signal under each dynamic strain excitation signal can be further determined.

[0047] In an embodiment of the present application, determining the power spectral density corresponding to each time domain signal includes: converting each time domain signal into a corresponding frequency domain signal; and determining the power spectral density corresponding to each time domain signal based on the frequency domain signal.

[0048] In this embodiment, it should be noted that power spectral density may refer to a statistic that describes the distribution of signal power in the frequency domain, and is usually used to analyze the frequency components of random signals. It is the Fourier transform of the autocorrelation function, which is used to represent the power distribution of the signal at different frequencies. In this technical solution, each time domain signal obtained is a waveform diagram. After the time domain signal is Fourier exchanged, the time domain signal can be converted into a corresponding frequency domain signal, wherein the frequency domain signal is a coordinate system used to describe the characteristics of the signal in terms of frequency. In the frequency domain, frequency is the horizontal coordinate and amplitude is the vertical coordinate, which is used to analyze the performance of the signal at different frequencies. Further, the power spectral density corresponding to each time domain signal can be obtained by calculating the frequency domain signal. The power spectral density is a spectrum diagram with the horizontal axis being frequency and the vertical axis being power, showing the power size of each frequency point.

[0049] Step 104: determine the phase signal test value of the optical fiber to be tested at each power spectrum density to obtain a maximum phase signal test value and a minimum phase signal test value.

[0050] In the embodiment of the present application, it should be noted that the phase signal test value may refer to a numerical index obtained by power spectrum density analysis to characterize the characteristics of the strain signal. Therefore, after obtaining the power spectrum density corresponding to each time domain signal, the phase signal test value of the optical fiber to be tested at each power spectrum density can be further calculated. At the same time, the maximum phase signal test value and the minimum phase signal test value can be obtained by comparing the numerical values. Specifically, the phase signal test value of the optical fiber to be tested at each power spectrum density can be calculated according to the following formula, including:

[0051]

[0052] Among them, θ is the phase signal test value, PSD(f signal ) is the square of the amplitude of the frequency domain signal calculated by Fourier transform, representing the power at frequency f.

[0053] It should be noted that after obtaining the phase signal test value under each test, a relationship curve between the signal amplitude and the phase signal test value can be drawn, so that the overall change trend of the phase signal test value can be intuitively observed through the relationship curve. If there are abnormal points or nonlinear changes, they can be more easily identified and eliminated, ensuring that the final maximum and minimum values ​​are representative and reliable.

[0054] Step 105: Determine the signal dynamic range test value of the optical fiber to be tested in each test based on the maximum phase signal test value and the minimum phase signal test value of each test.

[0055] In the embodiment of the present application, it should be noted that after obtaining the maximum phase signal test value and the minimum phase signal test value of the optical fiber to be tested in each test, for each test, the signal dynamic range test value of the optical fiber to be tested in each test can be determined based on the maximum phase signal test value and the minimum phase signal test value.

[0056] In an embodiment of the present application, determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test includes: for each test, determining the ratio of the maximum phase signal test value and the minimum phase signal test value of each test; performing a logarithmic operation on each ratio to obtain a result after the operation; and weighting each calculated ratio to obtain the signal dynamic range test value of the optical fiber to be tested under each test.

[0057] In this embodiment, it should be noted that when determining the signal dynamic range test value of the optical fiber to be tested in each test based on the maximum phase signal test value and the minimum phase signal test value, the ratio of the maximum phase signal test value to the minimum phase signal test value can be calculated first, and each ratio can be logarithmically operated to obtain the result after the operation; each ratio of the operation is weighted to obtain the signal dynamic range test value of the optical fiber to be tested in each test. Specifically, the calculation can be performed according to the following formula:

[0058] DR = 20·log 10 (θ max / θ min )

[0059] Among them, θ max is the maximum phase signal test value, θ min is the minimum phase signal test value, and DR is the signal dynamic range test value.

[0060] Step 106: When the signal dynamic range test value meets the preset condition, it is determined that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0061] In the embodiment of the present application, after calculating the signal dynamic range test value of the optical fiber to be tested in each test, if the obtained signal dynamic range test value meets the preset conditions, it can be determined that the sensor signal dynamic range of the optical fiber to be tested meets the specification requirements.

[0062] In an embodiment of the present application, the testing method also includes: determining that the signal dynamic range test value meets the preset condition when the following conditions are met: the number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold is greater than or equal to the preset number of times and the signal dynamic range test value under each test is greater than the minimum threshold.

[0063] In this embodiment, it should be noted that if the obtained signal dynamic range test value meets the preset conditions, it can be determined that the dynamic range of the sensor signal of the optical fiber to be tested meets the specification requirements, wherein the preset conditions may refer to the number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold value is greater than or equal to the preset number of times and the signal dynamic range test value under each test is greater than the minimum threshold value. Specifically, the maximum threshold value, the minimum threshold value and the preset number of times can be set according to actual needs and experience. For example, when the number of tests is 5 times, it can include but is not limited to setting the maximum threshold value to 50dB, setting the minimum threshold value to 48dB, and setting the preset number of times to 3 times. Therefore, if the number of tests in which the DR is not less than 50dB in 5 tests is not less than 3 times, and the minimum value of the DR in the 5 test results is not less than 48dB, it can be considered that the dynamic range of the sensor signal of the optical fiber to be tested meets the specification requirements.

[0064] The above technical scheme determines the number of tests and determines multiple dynamic strain excitation signals for each test; for each test, determines the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; determines the power spectrum density corresponding to each time domain signal; determines the phase signal test value of the optical fiber to be tested under each power spectrum density to obtain the maximum phase signal test value and the minimum phase signal test value; determines the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test; when the signal dynamic range test value meets the preset conditions, determines that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements, thereby realizing accurate measurement of the dynamic range of the optical fiber sensing signal.

[0065] This technical solution significantly improves the dynamic range: the dynamic range exceeds 50dB, meeting the needs of high-precision long-distance monitoring. Enhanced signal acquisition rate: the effective signal acquisition rate reaches 99.9%, ensuring the reliability of monitoring data. Improved sensitivity and accuracy: through all-optical coherent noise suppression and oDSP algorithm optimization, the system can detect weaker signals and improve the accuracy of event recognition.

[0066] The application scope of this technical solution includes:

[0067] (1) Oil and gas pipeline monitoring: Real-time monitoring of pipeline vibration and strain status to prevent leakage, damage and illegal intrusion.

[0068] (2) Border security system: monitors intrusions in border areas, generates alarms in a timely manner, and protects important facilities and sensitive areas.

[0069] (3) Earthquake and natural disaster monitoring: Capture earthquake fluctuation information, improve the accuracy of earthquake early warning, and monitor landslides and volcanic activities.

[0070] (4) Building structural health monitoring: Real-time monitoring of the strain and vibration of buildings and bridges to detect structural problems and perform preventive maintenance.

[0071] (5) Railway and highway monitoring: monitor the vibration of tracks and road surfaces, and promptly capture abnormal changes in status to ensure the safety of transportation systems.

[0072] (6) Environmental monitoring: monitor environmental parameters such as groundwater level, soil changes and atmospheric vibrations, and provide data support for environmental protection and ecological monitoring.

[0073] The application prospects of this technical solution include:

[0074] (1) Energy security: In oil and gas pipeline monitoring, high-precision dynamic range testing can be used to achieve real-time monitoring of pipeline status, improve the safety and reliability of energy transportation, reduce the occurrence of accidents, and save maintenance costs.

[0075] (2) Improved public safety: In border security systems, fiber optic sensors are deployed to detect and locate intrusions in a timely manner, enhance the security management capabilities of border areas, and provide technical support for public safety.

[0076] (3) Disaster warning and prevention: In earthquake and natural disaster monitoring, a highly sensitive sensor system is used to capture seismic waves and other natural disaster signals in real time, thereby improving the accuracy and timeliness of warnings and reducing losses caused by disasters.

[0077] (4) Infrastructure maintenance: In building structural health monitoring, by real-time monitoring of the strain and vibration of buildings and bridges, potential structural problems can be discovered and preventive maintenance can be performed to extend the service life of the infrastructure and ensure its safe operation.

[0078] (5) Environmental protection and monitoring: In environmental monitoring, high-precision monitoring technology is used to capture subtle signals of environmental changes, provide reliable data support for environmental protection and ecological monitoring, and contribute to the sustainable development of the ecological environment.

[0079] In general, this technical solution not only provides advanced monitoring technology in various fields, but also provides important guarantees for social security, economic development and environmental protection, and has significant social and economic value.

[0080] The present application provides a device for testing the dynamic range of an optical fiber sensing signal, comprising:

[0081] a memory configured to store instructions;

[0082] The processor is configured to call the instructions from the memory and implement the above-mentioned method for testing the dynamic range of the optical fiber sensing signal when executing the instructions.

[0083] A system for testing the dynamic range of an optical fiber sensing signal is provided, comprising:

[0084] The optical fiber to be tested;

[0085] The above-mentioned test device for the dynamic range of the optical fiber sensing signal.

[0086] The embodiment of the present application provides a machine-readable storage medium on which a program is stored. When the program is executed by a processor, the above-mentioned method for testing the dynamic range of the optical fiber sensing signal is implemented.

[0087] 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 3 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 dynamic range 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 dynamic range of optical fiber sensor signals is implemented.

[0088] Those skilled in the art will understand that Figure 3 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.

[0089] 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 multiple dynamic strain excitation signals for each test; for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; determining the power spectrum density corresponding to each time domain signal; determining the phase signal test value of the optical fiber to be tested under each power spectrum density to obtain a maximum phase signal test value and a minimum phase signal test value; determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test; when the signal dynamic range test value meets a preset condition, determining that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0090] In one embodiment, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining multiple dynamic strain excitation signals for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain multiple dynamic strain excitation signals for each test.

[0091] In one embodiment, for any test, the signal type and signal frequency of each dynamic strain excitation signal under the test are the same, the signal amplitudes of the multiple dynamic strain excitation signals under the test are all within a preset amplitude range and the signal amplitudes of any two dynamic strain excitation signals are different; the same multiple dynamic strain excitation signals are used between different tests.

[0092] In one embodiment, the testing method also includes: determining that the signal dynamic range test value meets the preset condition when the following conditions are met: the number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold is greater than or equal to the preset number of times and the signal dynamic range test value under each test is greater than the minimum threshold.

[0093] In one embodiment, for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal includes: determining the central sampling position for the optical fiber to be tested; acquiring the signal of the central sampling position under each dynamic strain excitation signal to determine the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0094] In one embodiment, determining the power spectrum density corresponding to each time domain signal includes: converting each time domain signal into a corresponding frequency domain signal; and determining the power spectrum density corresponding to each time domain signal based on the frequency domain signal.

[0095] In one embodiment, determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test includes: determining, for each test, the ratio of the maximum phase signal test value and the minimum phase signal test value of each test; performing a logarithmic operation on each ratio to obtain a result after the operation; and weighting each calculated ratio to obtain the signal dynamic range test value of the optical fiber to be tested under each test.

[0096] 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 multiple dynamic strain excitation signals for each test; for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal; determining the power spectrum density corresponding to each time domain signal; determining the phase signal test value of the optical fiber to be tested under each power spectrum density to obtain a maximum phase signal test value and a minimum phase signal test value; determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test; when the signal dynamic range test value meets a preset condition, determining that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements.

[0097] In one embodiment, the optical fiber to be tested is wound on a piezoelectric ceramic sensor, and determining multiple dynamic strain excitation signals for each test includes: outputting a driving voltage signal to the piezoelectric ceramic sensor to obtain multiple dynamic strain excitation signals for each test.

[0098] In one embodiment, for any test, the signal type and signal frequency of each dynamic strain excitation signal under the test are the same, the signal amplitudes of the multiple dynamic strain excitation signals under the test are all within a preset amplitude range and the signal amplitudes of any two dynamic strain excitation signals are different; the same multiple dynamic strain excitation signals are used between different tests.

[0099] In one embodiment, the testing method also includes: determining that the signal dynamic range test value meets the preset condition when the following conditions are met: the number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold is greater than or equal to the preset number of times and the signal dynamic range test value under each test is greater than the minimum threshold.

[0100] In one embodiment, for each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal includes: determining the central sampling position for the optical fiber to be tested; acquiring the signal of the central sampling position under each dynamic strain excitation signal to determine the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

[0101] In one embodiment, determining the power spectrum density corresponding to each time domain signal includes: converting each time domain signal into a corresponding frequency domain signal; and determining the power spectrum density corresponding to each time domain signal based on the frequency domain signal.

[0102] In one embodiment, determining the signal dynamic range test value of the optical fiber to be tested under each test based on the maximum phase signal test value and the minimum phase signal test value of each test includes: determining, for each test, the ratio of the maximum phase signal test value and the minimum phase signal test value of each test; performing a logarithmic operation on each ratio to obtain a result after the operation; and weighting each calculated ratio to obtain the signal dynamic range test value of the optical fiber to be tested under each test.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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 dynamic range of an optical fiber sensing signal, characterized in that: The test method includes: determining the number of tests and determining a plurality of dynamic strain excitation signals for each test; For each test, determining the time domain signal of the optical fiber under test under each dynamic strain excitation signal; Determine the power spectral density corresponding to each time domain signal; Determine the phase signal test value of the optical fiber to be tested at each power spectrum density to obtain a maximum phase signal test value and a minimum phase signal test value; Determine the signal dynamic range test value of the optical fiber under test in each test based on the maximum phase signal test value and the minimum phase signal test value of each test; When the signal dynamic range test value meets the preset conditions, it is determined that the dynamic range of the sensing signal of the optical fiber to be tested meets the specification requirements.

2. The method for testing the dynamic range 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 multiple dynamic strain excitation signals for each test are determined to include: A driving voltage signal is output to the piezoelectric ceramic sensor to obtain a plurality of dynamic strain excitation signals for each test.

3. The method for testing the dynamic range of optical fiber sensing signals according to claim 1, characterized in that: For any test, the signal type and signal frequency of each dynamic strain excitation signal under the test are the same, the signal amplitudes of the multiple dynamic strain excitation signals under the test are all within the preset amplitude range, and the signal amplitudes of any two dynamic strain excitation signals are different; The same multiple dynamic strain excitation signals are used between different tests.

4. The method for testing the dynamic range of optical fiber sensing signals according to claim 1, characterized in that: The test method also includes: The signal dynamic range test value is determined to meet the preset conditions when the following conditions are met: The number of tests in which the signal dynamic range test value is greater than or equal to the maximum threshold is greater than or equal to the preset number of tests and the signal dynamic range test value in each test is greater than the minimum threshold.

5. The method for testing the dynamic range of optical fiber sensing signals according to claim 1, characterized in that: For each test, determining the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal includes: Determining a central sampling position for the optical fiber to be tested; The signal of the central sampling position under each dynamic strain excitation signal is acquired to determine the time domain signal of the optical fiber to be tested under each dynamic strain excitation signal.

6. The method for testing the dynamic range of optical fiber sensing signals according to claim 1, characterized in that: Determining the power spectrum density corresponding to each time domain signal includes: Convert each time domain signal into a corresponding frequency domain signal; The power spectral density corresponding to each time domain signal is determined based on the frequency domain signal.

7. The method for testing the dynamic range of optical fiber sensing signals according to claim 1, characterized in that: Determining the signal dynamic range test value of the optical fiber under test in each test based on the maximum phase signal test value and the minimum phase signal test value of each test includes: For each test, determining a ratio of a maximum phase signal test value to a minimum phase signal test value for each test; Perform logarithmic operation on each ratio to obtain the result after operation; Each calculated ratio is weighted to obtain a signal dynamic range test value of the optical fiber under test in each test.

8. A device for testing the dynamic range of optical fiber sensing signals, characterized in that: include: a memory configured to store instructions; A processor is configured to call the instructions from the memory and implement the method for testing the dynamic range of an optical fiber sensing signal according to any one of claims 1 to 6 when executing the instructions.

9. A system for testing the dynamic range of optical fiber sensing signals, characterized in that: include: The optical fiber to be tested; The testing device for the dynamic range 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 dynamic range of an optical fiber sensing signal according to any one of claims 1 to 7.

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