A signal detection method and device, electronic equipment and storage medium

Abstract

The application relates to a signal detection method and device, electronic equipment and storage medium, and belongs to the technical field of optical fiber sensing and sensing network. The Brillouin scattering light in an optical fiber is obtained by injecting detection light into the optical fiber, the Brillouin scattering light and corresponding reference light are subjected to signal processing and spectrum compression, the Brillouin frequency shift signal after spectrum compression is obtained, the change of optical power at a specific frequency is detected according to the Brillouin frequency shift signal after spectrum compression, the change of the Brillouin frequency shift signal is obtained according to the change of optical power at the specific frequency, and the environmental change signal is obtained through the change of the Brillouin frequency shift signal. Since the linear region of the Brillouin frequency shift signal after spectrum compression is steeper, the change of optical power at the specific frequency is larger under the condition that other variables remain unchanged, spectrum compression can make the system measure smaller environmental changes, provide higher detection sensitivity, and improve the accuracy of signal detection.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensing and sensor network technology, and more specifically, to a signal detection method, apparatus, electronic device, and storage medium. Background Technology

[0002] Distributed fiber optic sensing features compact structure, long measurement distance, and strong real-time performance. Crucially, distributed sensing has no special requirements for fiber type and can utilize existing communication fiber optic cables, significantly reducing the hardware cost of fiber optic deployment. Depending on the operating wavelength of the sensing system, common distributed fiber optic sensing methods include Raman scattering sensing, Rayleigh scattering sensing, and Brillouin scattering sensing. Among these, Brillouin fiber optic sensing technology, due to its good temperature and strain dependence, is playing an increasingly important role in the real-time monitoring of large-scale civil and geological structures such as mines, oil pipelines, and bridges.

[0003] Brillouin scattering can be divided into spontaneous Brillouin scattering-based time-domain reflectometry (BOTDR) and stimulated Brillouin scattering-based time-domain analysis (BOTDA). BOTDR sensing systems only require the probe light to be input into one port of the system, and their sensing process is unaffected by fiber breakage, thus offering significant advantages in engineering applications. However, because the signal intensity of spontaneous Brillouin scattering is much weaker than that of stimulated Brillouin scattering, the signal-to-noise ratio of BOTDR systems is much lower than that of BOTDA systems, and the sensing distance is also shorter. Therefore, improving the detection sensitivity is a key issue in developing BOTDR sensing technology and expanding its application range.

[0004] Besides detection sensitivity, the measurement response speed is also a crucial factor affecting the sensing performance of a BOTDR system. Sweeping-frequency BOTDRs scan the Brillouin gain spectrum point-by-point, then obtain the changes in the measured parameter through frequency shift. This approach suffers from high time overhead and poor real-time performance, making it difficult to promptly report instantaneous changes in the measured parameter. Unlike sweeping-frequency BOTDRs, ramp-assisted BOTDRs measure only the change in Brillouin gain at a single frequency point and invert it to obtain the measured parameter, significantly improving the system's response speed. However, due to the low signal-to-noise ratio, the number of measurements must be significantly increased to reduce measurement errors, which greatly reduces the response speed of the ramp-assisted BOTDR system. Summary of the Invention

[0005] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide a signal detection method, device, electronic device and storage medium to improve the accuracy of signal detection.

[0006] According to a first aspect of this application, a signal detection method is provided, the detection method comprising:

[0007] The probe light is directed into the optical fiber, and the Brillouin scattered light in the optical fiber is obtained;

[0008] The reference light corresponding to the Brillouin scattered light and the probe light are processed respectively;

[0009] The corresponding Brillouin frequency shift signal is obtained based on the processed Brillouin scattered light and the reference light;

[0010] The change in optical power at a specific frequency is detected based on the Brillouin frequency shift signal;

[0011] The change in the Brillouin frequency shift signal is obtained based on the change in optical power at the specific frequency.

[0012] The environmental change signal is obtained by the change of the Brillouin frequency shift signal.

[0013] By processing the Brillouin scattered light and the reference light and performing spectral compression, a spectrally compressed Brillouin frequency shift signal is obtained. The change in optical power at a specific frequency is detected based on the spectrally compressed Brillouin frequency shift signal. Since the linear region of the spectrally compressed Brillouin frequency shift signal is steeper, the compressed spectrum can measure smaller environmental changes while keeping other variables constant, thus providing higher detection sensitivity. Correspondingly, the change in optical power at a specific frequency is greater in the compressed spectrum, thereby effectively improving the detection accuracy of signals at a specific frequency.

[0014] Furthermore, the processing of the reference light corresponding to the Brillouin scattered light and the probe light specifically includes:

[0015] The Brillouin scattered light is filtered and its spectrum compressed.

[0016] The reference light is subjected to depolarization noise suppression and modulation, and the optical signal is amplified.

[0017] By filtering and spectral compression of the Brillouin scattered light, the sensitivity of the Brillouin scattered light can be improved; at the same time, by suppressing and modulating the depolarization noise of the reference light and amplifying the optical signal, the signal-to-noise ratio can be improved and the detection accuracy can be increased.

[0018] Furthermore, the filtering and spectral compression of the Brillouin scattered light specifically includes:

[0019] The Brillouin scattered light is filtered and spectrally compressed according to a set center wavelength and full width at half maximum (FWHM) to obtain the spectrally compressed Brillouin scattered light.

[0020] By adjusting the center wavelength and full width at half maximum (FWHM) of the filter equipment, various operating conditions with different characteristics of the test environment can be measured, thereby improving the dynamic range of the measurement.

[0021] Furthermore, the process of suppressing and modulating depolarization noise and amplifying the optical signal of the reference light specifically includes:

[0022] Depolarization noise is suppressed by changing the polarization state of the reference light, and the noise-reduced reference light is obtained.

[0023] The noise-reduced reference light is modulated to generate reference light containing two frequency sidebands;

[0024] The reference light containing two frequency sidebands is amplified to obtain the amplified reference light.

[0025] Furthermore, the step of obtaining the corresponding Brillouin frequency shift signal based on the processed Brillouin scattered light and the reference light specifically includes:

[0026] The Brillouin scattered light after filtering and spectral compression and the reference light after optical signal amplification are power balanced to obtain Brillouin scattered light and reference light with the same power.

[0027] Beating the Brillouin scattered light and the reference light with the same power at the same frequency yields the corresponding Brillouin frequency shift signal.

[0028] Furthermore, the specific frequency is set according to the frequency shift range, which corresponds to the linear region of the Brillouin frequency shift signal.

[0029] By setting a specific frequency within the frequency range corresponding to the linear region of the Brillouin shift signal as the operating frequency for optical power detection, when the environmental signal under test changes, the spectral lines of the Brillouin shift signal undergo a corresponding spectral shift, resulting in a change in the optical power at the operating frequency. Within the linear region of the Brillouin shift signal spectral lines, the Brillouin shift is approximately linearly correlated with the optical power measured at the operating frequency. Furthermore, the Brillouin shift is proportional to the change in the environmental signal. Therefore, by measuring the change in optical power at the operating frequency, real-time changes in temperature or strain can be inverted, reducing the detection time and improving detection efficiency.

[0030] Furthermore, the step of detecting the change in optical power at a specific frequency based on the Brillouin frequency shift signal specifically includes:

[0031] Obtain a sinusoidal signal of the specified frequency;

[0032] The sine wave signal at the specific frequency is beat-frequencyed with the Brillouin frequency shift signal to obtain the optical power of the Brillouin frequency shift signal at the specific frequency, and the change of optical power at the specific frequency is monitored.

[0033] By beating the Brillouin frequency shift signal after spectral compression with a sinusoidal signal of a specific frequency, the optical power of the Brillouin frequency shift signal at the specific frequency can be obtained. This enables high-precision and high-sensitivity detection of the optical power at the specific frequency, thereby improving detection accuracy.

[0034] According to a second aspect of this application, a signal detection device is provided, the device comprising:

[0035] An optical transceiver module is used to direct probe light into an optical fiber and acquire Brillouin scattered light in the optical fiber.

[0036] The light processing module is used to process the Brillouin scattered light and the reference light corresponding to the probe light, respectively.

[0037] The signal acquisition module is used to acquire the corresponding Brillouin frequency shift signal based on the processed Brillouin scattered light and the reference light;

[0038] The power detection module is used to detect changes in optical power at a specific frequency based on the Brillouin frequency shift signal;

[0039] The frequency shift detection module is used to obtain the change of the Brillouin frequency shift signal based on the change of optical power at the specific frequency;

[0040] The environment acquisition module is used to acquire environmental change signals by observing the changes in the Brillouin frequency shift signal.

[0041] According to a third aspect of this application, an electronic device is provided, comprising:

[0042] Memory, used to store one or more computer programs;

[0043] A processor, when the one or more computer programs are executed by the processor, implements the signal detection method described in the first aspect above.

[0044] According to a fourth aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the signal detection method described in the first aspect above.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] 1. This invention processes and compresses the spectrum of the Brillouin scattered light and the reference light to obtain a spectrum-compressed Brillouin frequency shift signal. The change in optical power at a specific frequency is detected based on this spectrum-compressed Brillouin frequency shift signal. Because the linear region of the spectrum-compressed Brillouin frequency shift signal is steeper, the compressed spectrum can measure smaller environmental changes while keeping other variables constant, thus providing higher detection sensitivity. Correspondingly, the change in optical power at a specific frequency is greater in the compressed spectrum, thereby effectively improving the detection accuracy of signals at specific frequencies.

[0047] 2. This invention improves the signal-to-noise ratio and detection accuracy by suppressing and modulating the reference light to reduce polarization noise and amplifying the optical signal. By measuring the Brillouin frequency shift signal after spectral compression by beating the Brillouin scattered light and the reference light with the same power, the measurement accuracy of the Brillouin frequency shift can be significantly improved.

[0048] 3. By flexibly adjusting the center wavelength and full width at half maximum (FWHM) of the filtering equipment, this invention can measure various operating conditions with different characteristics of the test environment, thereby improving the dynamic range of the measurement.

[0049] 4. This invention selects a frequency within the frequency range corresponding to the linear region of the Brillouin shift signal as the operating frequency for optical power detection. When the environmental signal under test changes, the Brillouin shift signal spectral lines undergo a corresponding spectral shift, resulting in a change in the optical power at the operating frequency. Within the linear region of the Brillouin shift signal spectral lines, the Brillouin shift is approximately linearly correlated with the optical power measured at the operating frequency. Furthermore, the Brillouin shift is proportional to the change in the environmental signal. Therefore, real-time changes in temperature or strain can be obtained by measuring the change in optical power at the operating frequency, reducing the detection time and improving detection efficiency.

[0050] 5. By comparing the spectrum-compressed Brillouin frequency shift signal with a sinusoidal signal of a specific frequency, the present invention can perform high-precision and high-sensitivity detection of optical power at the specific frequency, thereby improving detection accuracy. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the electronic device structure provided in this embodiment.

[0053] Figure 2 The flowchart illustrates the steps of the detection method provided in this embodiment.

[0054] Figure 3 This is a structural diagram of the detection device provided in this embodiment.

[0055] Figure captions: Optical transceiver module 11, optical processing module 12, signal acquisition module 13, power detection module 14, frequency shift detection module 15, environment acquisition module 16, electronic device 20, memory 21, processor 22, communication module 23, input / output interface 24, bus 25.

[0056] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this application. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0057] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. Detailed Implementation

[0059] Example 1

[0060] Distributed fiber optic sensing features compact structure, long measurement distance, and strong real-time performance. Crucially, distributed sensing has no special requirements for fiber type and can utilize existing communication fiber optic cables, significantly reducing the hardware cost of fiber optic deployment. Depending on the operating wavelength of the sensing system, common distributed fiber optic sensing methods include Raman scattering sensing, Rayleigh scattering sensing, and Brillouin scattering sensing. Among these, Brillouin fiber optic sensing technology, due to its good temperature and strain dependence, is playing an increasingly important role in the real-time monitoring of large-scale civil and geological structures such as mines, oil pipelines, and bridges.

[0061] Brillouin scattering can be divided into spontaneous Brillouin scattering-based time-domain reflectometry (BOTDR) and stimulated Brillouin scattering-based time-domain analysis (BOTDA). BOTDR sensing systems only require the probe light to be input into one port of the system, and their sensing process is unaffected by fiber breakage, thus offering significant advantages in engineering applications. However, because the signal intensity of spontaneous Brillouin scattering is much weaker than that of stimulated Brillouin scattering, the signal-to-noise ratio of BOTDR systems is much lower than that of BOTDA systems, and the sensing distance is also shorter. Therefore, improving the detection sensitivity is a key issue in developing BOTDR sensing technology and expanding its application range.

[0062] Besides detection sensitivity, the measurement response speed is also a crucial factor affecting the sensing performance of a BOTDR system. Sweeping-frequency BOTDRs scan the Brillouin gain spectrum point-by-point, then obtain the changes in the measured parameter through frequency shift. This approach suffers from high time overhead and poor real-time performance, making it difficult to promptly report instantaneous changes in the measured parameter. Unlike sweeping-frequency BOTDRs, ramp-assisted BOTDRs measure only the change in Brillouin gain at a single frequency point and invert it to obtain the measured parameter, significantly improving the system's response speed. However, due to the low signal-to-noise ratio, the number of measurements must be significantly increased to reduce measurement errors, which greatly reduces the response speed of the ramp-assisted BOTDR system.

[0063] In order to solve the above problems and improve the accuracy of signal detection, such as Figure 2 As shown, this embodiment provides a signal detection method, the method comprising:

[0064] S1: The probe light is directed into the optical fiber, and the Brillouin scattered light in the optical fiber is obtained;

[0065] Specifically, in this embodiment, the optical fiber can be connected to a ramp-assisted BOTDR system. The laser of the ramp-assisted BOTDR system generates a narrow linewidth laser, which is then split into two paths: one as a probe light and the other as a reference light. The probe light is modulated into a laser pulse sequence and amplified before being injected into the optical fiber. When the modulated laser pulse sequence is transmitted in the optical fiber, it generates spontaneous Brillouin scattering in the reverse direction. The Brillouin scattering contains information about various environmental changes in the optical fiber. By receiving the Brillouin scattered light, environmental changes can be effectively monitored.

[0066] Preferably, the laser center wavelength is 1550nm, the linewidth is 20KHz-50KHz, and the power ratio of the probe light to the reference light is 9:1.

[0067] S2: Process the reference light corresponding to the Brillouin scattered light and the probe light respectively;

[0068] In this embodiment, the processing of the reference light corresponding to the Brillouin scattered light and the probe light specifically includes:

[0069] The Brillouin scattered light is filtered and its spectrum compressed.

[0070] The reference light is subjected to depolarization noise suppression and modulation, and the optical signal is amplified.

[0071] Specifically, the filtering and spectral compression of the Brillouin scattered light includes:

[0072] The Brillouin scattered light is filtered and spectrally compressed according to a set center wavelength and full width at half maximum (FWHM) to obtain the spectrally compressed Brillouin scattered light.

[0073] Specifically, in this embodiment, the Brillouin scattered light returning from the optical fiber enters the tunable filter of the ramp-assisted BOTDR system. The Brillouin scattered light exiting the tunable filter has the same center wavelength as the Brillouin scattered light incident on the tunable filter. Therefore, under the condition that the temperature or strain changes in the same way, these two lights exhibit the same Brillouin frequency shift. At the same time, the tunable filter performs spectral compression on the light, so the tunable filter compresses the Brillouin scattered light according to the full width at half maximum (FWHM) of the original spectrum of the Brillouin scattered light.

[0074] Preferably, the tunable filter can be an acousto-optic tunable filter or a fiber optic Fabry-Perot tunable filter. The center wavelength of the tunable filter is continuously adjustable in the range of 1545nm-1555nm, and the full width at half maximum (FWHM) is continuously adjustable in the range of 20MHz-100MHz.

[0075] Correspondingly, the process of suppressing and modulating depolarization noise and amplifying the optical signal of the reference light specifically includes:

[0076] Depolarization noise is suppressed by changing the polarization state of the reference light, and the noise-reduced reference light is obtained.

[0077] The noise-reduced reference light is modulated to generate reference light containing two frequency sidebands;

[0078] The reference light containing two frequency sidebands is amplified to obtain the amplified reference light.

[0079] In this embodiment, the polarization state of the reference light can be changed by a polarization scrambler to suppress depolarization noise. Then, the reference light after suppressing the depolarization noise is modulated into a reference light containing two frequency sidebands. Next, the modulated reference light is amplified. By suppressing noise and the reference light after signal amplification has a higher signal-to-noise ratio, it can be effectively combined with the Brillouin scattering light to improve the accuracy of signal detection.

[0080] S3: Obtain the corresponding Brillouin frequency shift signal based on the processed Brillouin scattered light and the reference light;

[0081] Specifically, the Brillouin scattered light after filtering and spectral compression and the reference light after optical signal amplification are power balanced to obtain Brillouin scattered light and reference light with the same power;

[0082] Beating the Brillouin scattered light and the reference light with the same power at the same frequency yields the corresponding Brillouin frequency shift signal.

[0083] By balancing the power of the Brillouin scattered light and the reference light to obtain Brillouin scattered light and the reference light with the same power, environmental change information in the Brillouin scattered light can be effectively extracted by beat frequency.

[0084] S4: Detect the change in optical power at a specific frequency based on the Brillouin frequency shift signal;

[0085] In this embodiment, detecting the change in optical power at a specific frequency based on the Brillouin frequency shift signal may specifically include:

[0086] Obtain a sinusoidal signal of the specified frequency;

[0087] The sine wave signal at the specific frequency is beat-frequencyed with the Brillouin frequency shift signal to obtain the optical power of the Brillouin frequency shift signal at the specific frequency, and the change of optical power at the specific frequency is monitored.

[0088] Specifically, in this embodiment, the specific frequency is set according to the frequency shift range, which corresponds to the linear region of the Brillouin frequency shift signal. Since the specific frequency is related to the linear region of the Brillouin frequency domain signal, the change in optical power at the specific frequency exhibits a linear state, making it easier and more accurate to obtain the change.

[0089] Therefore, in this embodiment, by using a sinusoidal signal of a specific frequency to beat the Brillouin frequency shift signal after spectral compression, the optical power of the Brillouin frequency shift signal at the specific frequency can be obtained, thereby enabling better detection of changes in optical power at the specific frequency.

[0090] S5: Obtain the change in the Brillouin frequency shift signal based on the change in optical power at the specific frequency;

[0091] As described above, in this embodiment, when the Brillouin frequency shift signal undergoes a spectral shift, it will cause a change in the optical power at the specific frequency. Since the specific frequency is set according to the linear region of the Brillouin signal, the amount of spectral shift of the Brillouin signal is approximately linearly related to the amount of change in the measured optical power. Conversely, the amount of change in the Brillouin frequency shift signal can be obtained based on the amount of change in the optical power at the specific frequency.

[0092] S6: Obtain environmental change signals by measuring the changes in the Brillouin frequency shift signal;

[0093] In this embodiment, the spectral shift of the Brillouin frequency shift signal actually indicates an environmental change at the corresponding location. Therefore, the corresponding environmental change can be monitored by monitoring the change of the Brillouin frequency shift signal. At the same time, since the frequency shift change of the Brillouin frequency shift signal at the specific frequency is linearly related to the change of optical power, and the frequency shift of the Brillouin frequency shift signal is proportional to the change of environmental temperature and strain, the real-time environmental change and the amount of real-time change can be accurately calculated by measuring the change of optical power at the specific power level.

[0094] Example 2

[0095] Based on the same technical concept as in Embodiment 1, such as Figure 3 As shown, this embodiment provides a signal detection device, the device comprising:

[0096] The optical transceiver module 11 is used to inject probe light into the optical fiber and acquire the Brillouin scattered light in the optical fiber;

[0097] Specifically, in this embodiment, the optical fiber can be connected to a ramp-assisted BOTDR system. The laser of the ramp-assisted BOTDR system generates a narrow linewidth laser, which is then split into two paths: one as a probe light and the other as a reference light. The probe light is modulated into a laser pulse sequence and amplified before being injected into the optical fiber. When the modulated laser pulse sequence is transmitted in the optical fiber, it generates spontaneous Brillouin scattering in the reverse direction. The Brillouin scattering contains information about various environmental changes in the optical fiber. By receiving the Brillouin scattered light, environmental changes can be effectively monitored.

[0098] Preferably, the laser center wavelength is 1550nm, the linewidth is 20KHz-50KHz, and the power ratio of the probe light to the reference light is 9:1.

[0099] The light processing module 12 is used to process the Brillouin scattered light and the reference light corresponding to the probe light respectively;

[0100] In this embodiment, the processing of the reference light corresponding to the Brillouin scattered light and the probe light specifically includes:

[0101] The Brillouin scattered light is filtered and its spectrum compressed.

[0102] The reference light is subjected to depolarization noise suppression and modulation, and the optical signal is amplified.

[0103] Specifically, the filtering and spectral compression of the Brillouin scattered light includes:

[0104] The Brillouin scattered light is filtered and spectrally compressed according to a set center wavelength and full width at half maximum (FWHM) to obtain the spectrally compressed Brillouin scattered light.

[0105] Specifically, in this embodiment, the Brillouin scattered light returning from the optical fiber enters the tunable filter of the ramp-assisted BOTDR system. The Brillouin scattered light exiting the tunable filter has the same center wavelength as the Brillouin scattered light incident on the tunable filter. Therefore, under the condition that the temperature or strain changes in the same way, these two lights exhibit the same Brillouin frequency shift. At the same time, the tunable filter performs spectral compression on the light, so the tunable filter compresses the Brillouin scattered light according to the full width at half maximum (FWHM) of the original spectrum of the Brillouin scattered light.

[0106] Preferably, the tunable filter can be an acousto-optic tunable filter or a fiber optic Fabry-Perot tunable filter. The center wavelength of the tunable filter is continuously adjustable in the range of 1545nm-1555nm, and the full width at half maximum (FWHM) is continuously adjustable in the range of 20MHz-100MHz.

[0107] Correspondingly, the process of suppressing and modulating depolarization noise and amplifying the optical signal of the reference light specifically includes:

[0108] Depolarization noise is suppressed by changing the polarization state of the reference light, and the noise-reduced reference light is obtained.

[0109] The noise-reduced reference light is modulated to generate reference light containing two frequency sidebands;

[0110] The reference light containing two frequency sidebands is amplified to obtain the amplified reference light.

[0111] In this embodiment, the polarization state of the reference light can be changed by a polarization scrambler to suppress depolarization noise. Then, the reference light after suppressing the depolarization noise is modulated into a reference light containing two frequency sidebands. Next, the modulated reference light is amplified. By suppressing noise and the reference light after signal amplification has a higher signal-to-noise ratio, it can be effectively combined with the Brillouin scattering light to improve the accuracy of signal detection.

[0112] Signal acquisition module 13 is used to acquire the corresponding Brillouin frequency shift signal based on the processed Brillouin scattered light and the reference light;

[0113] Specifically, the Brillouin scattered light after filtering and spectral compression and the reference light after optical signal amplification are power balanced to obtain Brillouin scattered light and reference light with the same power;

[0114] Beating the Brillouin scattered light and the reference light with the same power at the same frequency yields the corresponding Brillouin frequency shift signal.

[0115] By balancing the power of the Brillouin scattered light and the reference light to obtain Brillouin scattered light and the reference light with the same power, environmental change information in the Brillouin scattered light can be effectively extracted by beat frequency.

[0116] Power detection module 14 is used to detect changes in optical power at a specific frequency based on the Brillouin frequency shift signal;

[0117] In this embodiment, detecting the change in optical power at a specific frequency based on the Brillouin frequency shift signal may specifically include:

[0118] Obtain a sinusoidal signal of the specified frequency;

[0119] The sine wave signal at the specific frequency is beat-frequencyed with the Brillouin frequency shift signal to obtain the optical power of the Brillouin frequency shift signal at the specific frequency, and the change of optical power at the specific frequency is monitored.

[0120] Specifically, in this embodiment, the specific frequency is set according to the frequency shift range, which corresponds to the linear region of the Brillouin frequency shift signal. Since the specific frequency is related to the linear region of the Brillouin frequency domain signal, the change in optical power at the specific frequency exhibits a linear state, making it easier and more accurate to obtain the change.

[0121] Therefore, in this embodiment, by using a sinusoidal signal of a specific frequency to beat the Brillouin frequency shift signal after spectral compression, the optical power of the Brillouin frequency shift signal at the specific frequency can be obtained, thereby enabling better detection of changes in optical power at the specific frequency.

[0122] The frequency shift detection module 15 is used to obtain the change of the Brillouin frequency shift signal based on the change of optical power at the specific frequency.

[0123] As described above, in this embodiment, when the Brillouin frequency shift signal undergoes a spectral shift, it will cause a change in the optical power at the specific frequency. Since the specific frequency is set according to the linear region of the Brillouin signal, the amount of spectral shift of the Brillouin signal is approximately linearly related to the amount of change in the measured optical power. Conversely, the amount of change in the Brillouin frequency shift signal can be obtained based on the amount of change in the optical power at the specific frequency.

[0124] The environment acquisition module 16 is used to acquire environmental change signals by means of changes in the Brillouin frequency shift signal.

[0125] In this embodiment, the spectral shift of the Brillouin frequency shift signal actually indicates an environmental change at the corresponding location. Therefore, the corresponding environmental change can be monitored by monitoring the change of the Brillouin frequency shift signal. At the same time, since the frequency shift change of the Brillouin frequency shift signal at the specific frequency is linearly related to the change of optical power, and the frequency shift of the Brillouin frequency shift signal is proportional to the change of environmental temperature and strain, the real-time environmental change and the amount of real-time change can be accurately calculated by measuring the change of optical power at the specific power level.

[0126] It is understood that the above-described device embodiments and method embodiments can correspond to each other, and similar descriptions of the device embodiments can be referred to the method embodiments. To avoid repetition, further details are omitted here. The signal detection device provided in this application can execute a signal detection method provided in any embodiment of this application, possessing the corresponding functional modules and beneficial effects for executing the method. The functional modules of the signal detection device can be implemented in hardware, in software instructions, or in a combination of hardware and software modules.

[0127] Specifically, the steps of the method embodiments of this application can be implemented by integrated logic circuits in the processor hardware and / or instructions in software form. The steps of a signal detection method in conjunction with the embodiments of this application can be directly implemented by a hardware encoding processor, or by a combination of hardware and software modules in the encoding processor. Optionally, the software module can be located in random access memory, and storage media such as read-only memory, programmable read-only memory, flash memory, electrically erasable programmable memory, and registers are all acceptable. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps in the above method embodiments.

[0128] Example 3

[0129] Based on the same inventive concept as the embodiments, this application provides an electronic device 20, the structure of which is as follows: Figure 1 As shown.

[0130] like Figure 1 As shown, the electronic device 20 includes a memory 21, a processor 22, a communication module 23, and an input / output interface 24, etc. Optionally, the memory 21, the processor 22, the communication module 23, and the input / output interface 24 can be connected and communicate with each other through a bus 25.

[0131] The memory 21 is used to store one or more computer programs and to transfer the code of the computer programs to the processor 22; when the one or more computer programs are executed by the processor 711, a signal detection method in this embodiment of the application is implemented.

[0132] Optionally, the electronic device 20 can be connected to a network via the communication module 23 to communicate with other devices, such as terminals or servers, to achieve data interaction. The electronic device 20 can be various forms of digital computers, exemplarily such as desktop computers, servers, workbenches, mainframes, or other types of computers. The electronic device 20 can also be various forms of mobile terminals, exemplarily such as smartphones, tablets, wearable devices (such as helmets, glasses, watches, etc.), and other similar mobile terminals.

[0133] Optionally, the electronic device 20 can connect to necessary input / output devices, such as a keyboard or display device, via the input / output interface 24. The electronic device 20 itself may have a display device, and other display devices can also be connected externally via the input / output interface 24. Optionally, a storage device, such as a hard disk, can also be connected via the input / output interface 24 to store data from the electronic device 20, read data from the storage device, or store data from the storage device in the memory 21. It is understood that the input / output interface 24 can be a wired interface or a wireless interface. Depending on the actual application scenario, the device connected to the input / output interface 24 can be a component of the electronic device 20 or an external device connected to the electronic device 20 when needed.

[0134] Optionally, the memory 21 may be a volatile memory and / or a non-volatile memory. The volatile memory may be a random access memory, etc., and the non-volatile memory may be a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, or a flash memory, etc.

[0135] Optionally, the computer program stored in the processor 711 can be divided into one or more modules, which are stored in the memory 21 and executed by the processor 22 to perform the method provided in this embodiment. The one or more modules can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the electronic device 20.

[0136] Optionally, the processor 22 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 22 include, but are not limited to, a central processing unit, a graphics processing unit, a digital signal processor, various special-purpose artificial intelligence computing chips, various processors running machine learning model algorithms, and can also be any suitable controller, microcontroller, processor, etc. The processor 22 executes the various methods and processes of this embodiment, exemplarily, such as a signal detection method according to an embodiment of this application.

[0137] Optionally, the bus 25 may include a path for transmitting information. The bus 25 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Depending on its function, the bus 25 may be divided into an address bus, a data bus, a control bus, etc.

[0138] In an optional implementation, this application embodiment also provides a storage medium storing a computer program thereon, which, when executed by a computer, enables the computer to perform the methods described in the above-described method embodiments. Part or all of the computer program may be loaded and / or installed on the memory 21 of the electronic device 20. When the computer program is executed by the processor 22, one or more steps of a signal detection method according to an embodiment of this application can be performed.

[0139] Optionally, the computer-readable storage medium may be a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc.

[0140] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A signal detection method, characterized in that, The detection method includes: The probe light is directed into the optical fiber, and the Brillouin scattered light in the optical fiber is obtained; The Brillouin scattered light is filtered and spectrally compressed according to a set center wavelength and full width at half maximum (FWHM) to obtain the spectrally compressed Brillouin scattered light. Depolarization noise is suppressed by changing the polarization state of the reference light corresponding to the probe light, and the noise-reduced reference light is obtained. The noise-reduced reference light is modulated to generate reference light containing two frequency sidebands; The reference light containing two frequency sidebands is amplified to obtain the amplified reference light. The Brillouin scattered light after filtering and spectral compression and the reference light after optical signal amplification are power balanced to obtain Brillouin scattered light and reference light with the same power. Beat the Brillouin scattered light and the reference light with the same power to obtain the corresponding Brillouin frequency shift signal; The change in optical power at a specific frequency is detected based on the Brillouin frequency shift signal; the specific frequency is set according to the frequency shift frequency range, and the frequency shift frequency range corresponds to the linear region of the Brillouin frequency shift signal; The change in the Brillouin frequency shift signal is obtained based on the change in optical power at the specific frequency. The environmental change signal is obtained by the change of the Brillouin frequency shift signal.

2. The signal detection method according to claim 1, characterized in that, The detection of changes in optical power at a specific frequency based on the Brillouin frequency shift signal specifically includes: Obtain a sinusoidal signal of the specified frequency; The sine wave signal at the specific frequency is beat-frequencyed with the Brillouin frequency shift signal to obtain the optical power of the Brillouin frequency shift signal at the specific frequency, and the change of optical power at the specific frequency is monitored.

3. A signal detection device, characterized in that, The device includes: An optical transceiver module is used to direct probe light into an optical fiber and acquire Brillouin scattered light in the optical fiber. The optical processing module is used to filter and compress the Brillouin scattered light according to a set center wavelength and full width at half maximum (FWHM) to obtain the spectrally compressed Brillouin scattered light; to suppress depolarization noise by changing the polarization state of the reference light corresponding to the probe light to obtain the denoised reference light; to modulate the denoised reference light to generate the reference light containing two frequency sidebands; and to amplify the reference light containing the two frequency sidebands to obtain the amplified reference light. The signal acquisition module is used to perform power balancing on the filtered and spectrally compressed Brillouin scattered light and the amplified reference light to obtain Brillouin scattered light and reference light with the same power; and to beat the Brillouin scattered light and reference light with the same power to obtain the corresponding Brillouin frequency shift signal. A power detection module is used to detect changes in optical power at a specific frequency based on the Brillouin frequency shift signal; the specific frequency is set according to the frequency shift frequency range, and the frequency shift frequency range corresponds to the linear region of the Brillouin frequency shift signal; The frequency shift detection module is used to obtain the change of the Brillouin frequency shift signal based on the change of optical power at the specific frequency; The environment acquisition module is used to acquire environmental change signals by observing the changes in the Brillouin frequency shift signal.

4. The signal detection device according to claim 3, characterized in that, The detection of changes in optical power at a specific frequency based on the Brillouin frequency shift signal specifically includes: Obtain a sinusoidal signal of the specified frequency; The sine wave signal at the specific frequency is beat-frequencyed with the Brillouin frequency shift signal to obtain the optical power of the Brillouin frequency shift signal at the specific frequency, and the change of optical power at the specific frequency is monitored.

5. An electronic device, characterized in that, include: Memory, used to store one or more computer programs; A processor, when the one or more computer programs are executed by the processor, implements a signal detection method as described in any one of claims 1 to 2.

6. A computer-readable storage medium storing computer instructions for causing a processor to execute and implement a signal detection method as described in any one of claims 1 to 2.

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