Eddy current detection micro-vibration signal transmission method and system based on optical fiber sensing

Abstract

The invention provides an eddy current detection micro-vibration signal transmission method and system based on optical fiber sensing. The method comprises the following steps: firstly, forming periodic pressure disturbance in a preset area; secondly, generating a micro-vibration signal based on periodic pressure disturbance; converting the micro-vibration signal into a backscattering light signal; phase demodulation is carried out on the backscattered light signal, and the phase variation is extracted, so that the phase variation corresponds to the dynamic change of the eddy current field; then, according to the incidence relation between the phase variation and the flight parameters of the unmanned aerial vehicle, the phase variation is coded into a digital eddy current characteristic sequence; and finally, transmitting the digital eddy current characteristic sequence to a far-end monitoring platform through an optical fiber communication link so as to complete transmission of the eddy current detection micro-vibration signal. According to the technical scheme provided by the invention, the pertinence and reliability of monitoring are improved, and high-sensitivity detection, accurate feature extraction and reliable remote transmission of micro-vibration signals of an eddy current field are also realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal transmission, in particular to a micro-vibration signal transmission method and system based on eddy current detection of optical fiber sensing. BACKGROUND

[0002] In the field of critical infrastructure perimeter security, it is an important technical requirement to effectively monitor the intrusion of low-altitude unmanned aerial vehicles. Such scenarios require the monitoring system to have wide-area coverage, high sensitivity, and strong anti-interference capability, which can effectively sense the weak physical field changes generated by the unmanned aerial vehicle during flight and transmit relevant information to the remote monitoring center in real time for analysis and early warning.

[0003] In the prior art, a targeted solution is to use a vibration sensor array deployed on the ground for monitoring. By laying multiple independent vibration sensing nodes on the ground, the sound waves or vibration signals generated by the rotors of the unmanned aerial vehicle during take-off, landing or low-altitude flight are collected. Each node transmits the collected data to the processing center through a wireless network for fusion analysis to determine the position and state of the unmanned aerial vehicle.

[0004] However, the above-mentioned prior art has obvious defects. First, the vibration sensor array is easily disturbed by environmental noise, making it difficult to effectively separate the unique eddy current field micro-vibration characteristics of the unmanned aerial vehicle from the complex ground vibration background, resulting in insufficient monitoring sensitivity and high false alarm rate. Second, the dispersed wireless sensing nodes face challenges in data synchronization and transmission reliability, making it difficult to ensure the integrity and real-time performance of the monitoring data, and the system deployment and maintenance cost is high. SUMMARY

[0005] The present application provides a micro-vibration signal transmission method and system based on eddy current detection of optical fiber sensing to solve the problems of low monitoring sensitivity, high false alarm rate, difficulty in ensuring data synchronization and transmission reliability, and high system deployment and maintenance cost caused by environmental noise interference in the prior art.

[0006] In a first aspect, the present application provides a micro-vibration signal transmission method based on eddy current detection of optical fiber sensing, comprising:

[0007] Controlling the unmanned aerial vehicle to fly in a preset area, so that the eddy current field generated by the rotation of the rotors of the unmanned aerial vehicle forms a periodic pressure disturbance to the preset area, wherein the preset area is an area where a sensing optical fiber is buried on the ground;

[0008] Based on the periodic pressure disturbance of the eddy current field to the preset area, a micro-vibration signal is generated, which contains eddy current characteristic information;

[0009] Based on the sensing optical fiber, the micro-vibration signal is converted into a backscattered light signal;

[0010] phase demodulating the backscattering light signal to extract a phase variation, the phase variation corresponding to a dynamic change of the vortex field;

[0011] encoding the phase variation into a digital vortex feature sequence according to a correlation between the phase variation and a flight parameter of the unmanned aerial vehicle;

[0012] transmitting the digital vortex feature sequence to a remote monitoring platform through an optical fiber communication link to complete transmission of the vortex detection micro-vibration signal.

[0013] Optionally, the unmanned aerial vehicle is controlled to fly in a preset area, so that the vortex field generated by the rotation of the rotor of the unmanned aerial vehicle forms a periodic pressure disturbance to the preset area, wherein the preset area is an area where a sensing optical fiber is buried on the ground, comprising:

[0014] The unmanned aerial vehicle is controlled to fly along a preset flight path at a preset cruising altitude, and the rotor of the unmanned aerial vehicle is continuously rotated to push the air to move downward at the preset cruising altitude, so as to generate a dynamic vortex field below the rotor of the unmanned aerial vehicle;

[0015] The ground surface of the preset area is impacted by the dynamic vortex field, so that the air pressure borne by the ground surface changes periodically in strength and weakness with the rotation frequency of the rotor of the unmanned aerial vehicle and the flight speed of the unmanned aerial vehicle, to generate a periodic pressure disturbance.

[0016] Optionally, based on the periodic pressure disturbance of the vortex field to the preset area, a micro-vibration signal is generated, the micro-vibration signal containing vortex feature information, comprising:

[0017] The periodic pressure disturbance is applied to the ground surface of the preset area to be converted into a periodic mechanical action force on the ground medium;

[0018] The periodic mechanical action force causes the ground medium to produce an elastic deformation synchronized with the pressure change of the vortex field, wherein the elastic deformation propagates in a preset direction in the form of a stress wave in the ground medium;

[0019] The stress wave is applied to a sensing optical fiber buried in the ground medium, so that the sensing optical fiber produces corresponding mechanical vibration according to the periodicity of the stress wave;

[0020] The corresponding mechanical vibration of the sensing optical fiber is recorded as a micro-vibration signal.

[0021] Optionally, based on the sensing optical fiber, the micro-vibration signal is converted into a backscattering light signal, comprising:

[0022] A continuous light wave is injected into the sensing optical fiber as a distributed sensing medium;

[0023] The micro-vibration signal causes local deformation of the sensing optical fiber, so that the optical phase of the continuous light wave is directly modulated at the deformation position when the continuous light wave is transmitted in the sensing optical fiber;

[0024] According to the change of the optical phase, the mechanical vibration of the micro-vibration signal is converted to the continuous light wave to form a phase-modulated light wave;

[0025] The backscattered light signal is obtained by collecting backscattered light generated by the phase-modulated light wave inside the sensing optical fiber.

[0026] Optionally, the backscattered light signal is phase demodulated to extract a phase change amount, which corresponds to the dynamic change of the vortex field, including:

[0027] The backscattered light signal is mixed with a preset reference light signal to generate an interference light signal;

[0028] The light intensity change of the interference light signal is detected, wherein the light intensity change corresponds to the phase difference between the backscattered light signal and the reference light signal;

[0029] The light intensity change of the interference light signal is converted into an electrical signal;

[0030] The periodic fluctuation component caused by the micro-vibration signal is separated from the electrical signal;

[0031] According to the corresponding relationship between the light intensity and the phase difference of the interference light signal, the sequence of the phase change over time of the backscattered light signal is restored from the periodic fluctuation component, and the sequence of the phase change over time is taken as the phase change amount.

[0032] Optionally, according to the correlation between the phase change amount and the flight parameters of the unmanned aerial vehicle, the phase change amount is encoded into a digital vortex feature sequence, including:

[0033] The phase change amount is divided into a plurality of continuous time segments in time sequence;

[0034] Each of the time segments is matched with a corresponding set of flight parameters of the unmanned aerial vehicle, and the set of flight parameters includes the flight speed and the rotor speed of the unmanned aerial vehicle in the time segment;

[0035] The average phase change amplitude and the dominant phase change frequency in each time segment are bound to the matched set of flight parameters to form a data unit;

[0036] The amplitude, frequency and set of flight parameters in each data unit are converted into digital codes in a predetermined format in time sequence of the time segments;

[0037] combining the digital codes corresponding to the time segments in time sequence to obtain a digital eddy current feature sequence.

[0038] Optionally, the digital eddy current feature sequence is transmitted to a remote monitoring platform through an optical fiber communication link to complete transmission of the eddy current detected micro-vibration signal, comprising:

[0039] The digital eddy current feature sequence is encapsulated into continuous data packets according to a preset communication protocol.

[0040] The continuous data packets are modulated onto an optical carrier to generate an optical signal.

[0041] The optical signal is injected into an optical fiber communication link for transmission, and the optical signal is transmitted along the optical fiber to the remote monitoring platform.

[0042] The optical signal is received by the remote monitoring platform and demodulated to restore the continuous data packets.

[0043] The continuous data packets are parsed according to the preset communication protocol to recover the digital eddy current feature sequence.

[0044] In a second aspect, the present application provides an eddy current detected micro-vibration signal transmission system based on optical fiber sensing, comprising:

[0045] A control module is configured to control a UAV to fly in a preset area, so that the vortex field generated by the rotation of the rotor of the UAV forms a periodic pressure disturbance on the preset area, wherein the preset area is an area where a sensing optical fiber is buried on the ground.

[0046] A generation module is configured to generate a micro-vibration signal based on the periodic pressure disturbance of the vortex field on the preset area, wherein the micro-vibration signal contains eddy current feature information.

[0047] A conversion module is configured to convert the micro-vibration signal into a backscattering light signal based on the sensing optical fiber.

[0048] An extraction module is configured to perform phase demodulation on the backscattering light signal to extract a phase change amount, wherein the phase change amount corresponds to the dynamic change of the vortex field.

[0049] An encoding module is configured to encode the phase change amount into a digital eddy current feature sequence according to the correlation between the phase change amount and the flight parameters of the UAV.

[0050] A transmission module is configured to transmit the digital eddy current feature sequence to a remote monitoring platform through an optical fiber communication link to complete transmission of the eddy current detected micro-vibration signal.

[0051] In a third aspect, the present application provides a computing device, comprising a processing component and a storage component; the storage component stores one or more computer instructions; the one or more computer instructions are used to be called and executed by the processing component, so as to realize the vortex detection micro-vibration signal transmission method based on optical fiber sensing as described in the first aspect.

[0052] In a fourth aspect, the present application provides a computer storage medium, which stores a computer program; when the computer program is executed by a computer, a vortex detection micro-vibration signal transmission method based on optical fiber sensing as described in the first aspect is realized.

[0053] The present application converts the dynamic information of the aerial vehicle into the ground micro-vibration signal by using the vortex field generated by the rotor of the unmanned aerial vehicle to act on the buried sensing optical fiber, and completes the conversion and transmission from mechanical vibration to optical signal to digital feature sequence by means of the optical fiber itself; the distributed sensing characteristics of the optical fiber are effectively utilized, the wide-area and high-sensitivity detection of the specific physical field change is realized, a complete and closed technical path from physical disturbance sensing to information remote transmission is formed, and the pertinence and reliability of the monitoring are significantly improved.

[0054] Further, by directly transmitting the encoded digital vortex feature sequence through the optical fiber communication link, the integrity and anti-interference ability of the monitoring data in the transmission process are ensured; the transmission process utilizes the existing optical fiber link, avoids the stability problems common in wireless transmission, ensures the coherence and accuracy of the data transmission from the detection end to the monitoring platform end, and provides a reliable data basis for subsequent analysis.

[0055] These aspects or other aspects of the present application will be more apparent in the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0057] Figure 1 A flow chart of a vortex detection micro-vibration signal transmission method based on optical fiber sensing provided by the present application is shown;

[0058] Figure 2 A structural schematic diagram of a vortex detection micro-vibration signal transmission system based on optical fiber sensing provided by the present application is shown;

[0059] Figure 3 A structural schematic diagram of a computing device provided by the present application is shown. DETAILED DESCRIPTION

[0060] In order to better understand the technical solutions of the present application, the technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the present application.

[0061] In some of the processes described in the specification and the claims of the present application and the above-described accompanying drawings, a plurality of operations are included in a specific order, but it should be clearly understood that these operations can be executed or performed in parallel or in the order in which they appear in the text. The serial numbers of the operations, such as 101, 102, etc., are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes can include more or fewer operations, and these operations can be executed in sequence or in parallel. It should be noted that the descriptions of "first", "second", etc. in the text are used to distinguish different messages, devices, modules, etc., and do not represent the order of precedence. Also, "first" and "second" are not of different types.

[0062] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0063] Figure 1 A flowchart of a micro-vibration signal transmission method based on optical fiber sensing eddy current detection is provided for the present application, as shown in Figure 1 The method comprises the following steps:

[0064] Step 101, control the unmanned aerial vehicle to fly in the preset area, so that the vortex field generated by the rotation of the rotor of the unmanned aerial vehicle forms a periodic pressure disturbance to the preset area, wherein the preset area is an area where a sensing optical fiber is buried on the ground.

[0065] Optionally, step 101 can specifically include the following steps:

[0066] Step 1011, control the unmanned aerial vehicle to fly along a preset flight path at a preset cruising altitude, and continuously rotate the rotor of the unmanned aerial vehicle to push the air to move downward at the preset cruising altitude to generate a dynamic vortex field below the rotor of the unmanned aerial vehicle.

[0067] Step 1012, impact the ground surface of the preset area through the dynamic vortex field, so that the air pressure borne by the ground surface changes periodically in strength and weakness with the rotation frequency of the rotor of the unmanned aerial vehicle and the flight speed of the unmanned aerial vehicle, to generate a periodic pressure disturbance.

[0068] In the above scheme, the preset area refers to the pre-determined ground monitoring range, which is used to limit the action space of the vortex field of the unmanned aerial vehicle, and the boundary is determined by geographical survey;

[0069] The rotor refers to the rotating blade assembly at the top of the unmanned aerial vehicle, which is used to push air to generate downward airflow, and is driven to rotate by the motor;

[0070] The vortex field refers to the rotating airflow area formed when the rotor rotates, which is used to transfer mechanical energy to the ground, and is naturally formed by aerodynamic action;

[0071] Periodic pressure disturbance refers to the regular pressure change formed by the airflow on the ground, which is used to excite micro-vibration signals, and is obtained by monitoring with a pressure sensor;

[0072] The ground refers to the soil medium layer covering the sensing optical fiber, which is used to transfer vibration energy, and is formed by natural geological structure;

[0073] The preset cruising altitude refers to the fixed flight height of the unmanned aerial vehicle relative to the ground, which is used to control the action strength of the vortex field, and is obtained by setting the flight parameters;

[0074] The preset flight path refers to the planned route of the unmanned aerial vehicle, which is used to ensure that the vortex field covers the target area, and is obtained by setting the waypoint coordinates;

[0075] Downward motion refers to the vertical displacement of air pushed by the rotor, which is used to form impact force, and is generated by fluid mechanics;

[0076] Dynamic vortex field refers to the airflow area that changes with the movement of the unmanned aerial vehicle, which is used to continuously generate pressure disturbance, and is formed by airflow motion during flight;

[0077] Air pressure refers to the force per unit area of the ground exerted by the airflow, which is used to quantify the disturbance intensity, and is measured by a pressure sensing device;

[0078] Rotational frequency refers to the number of rotations per unit time of the rotor, which is used to determine the pressure change frequency, and is obtained by controlling the motor speed;

[0079] Flight speed refers to the rate of horizontal movement of the unmanned aerial vehicle, which is used to affect the shape of the vortex field, and is adjusted by the flight control system;

[0080] Periodic strength change refers to the phenomenon of regular fluctuation of air pressure with time, which is discovered by continuously monitoring the pressure value.

[0081] In the present scheme, first, through the waypoint navigation algorithm of the flight control system, the unmanned aerial vehicle control instructions are generated according to the coordinate sequence of the preset flight path, so that the unmanned aerial vehicle keeps the constant height flight along the planned path at the preset cruising height; second, based on the rotor aerodynamics principle, the motor speed is accurately adjusted by the PID controller, so that the rotor continuously rotates at a set rotation frequency, and the air is pushed to form a dynamic vortex field with a specific energy distribution; then, according to the Navier-Stokes equation in fluid mechanics, when the dynamic vortex field interacts with the ground surface, the kinetic energy of the airflow is converted into the ground surface pressure load through the pressure field transmission mechanism; finally, combined with the kinematic model, the coupling relationship between the flight speed and the rotor speed is solved in real time, and the action parameters of the vortex field are dynamically adjusted, so that the ground air pressure presents a strong and weak change mode with a stable period, and a periodic pressure disturbance in accordance with the preset characteristics is formed.

[0082] Exemplarily, after the sensing optical fiber is buried in a belt-shaped area with a length of 500 meters, the ground control station generates a flight path containing 20 waypoints through the waypoint planning algorithm; the flight control system of the unmanned aerial vehicle maintains the cruising height of 15 meters by using the PID control algorithm according to the path coordinates, and adjusts the rotor to rotate at a speed of 1200 revolutions per minute; when the unmanned aerial vehicle flies at a speed of 8 meters per second, according to the computational fluid dynamics simulation results, the vortex field generated by the rotor forms a periodic pressure disturbance with a frequency of 20 Hz and an amplitude of 20 Pa on the ground surface, and the periodic pressure disturbance presents a regular distribution along the direction of the optical fiber.

[0083] This step realizes the accurate conversion of the physical field energy through the multi-algorithm collaborative control, the waypoint navigation ensures the spatial positioning accuracy, the PID control guarantees the motion stability, the fluid mechanics model guides the parameter optimization, and finally the periodic pressure disturbance in accordance with the detection requirements is formed, which establishes an ideal excitation condition for the subsequent signal detection.

[0084] Step 102, based on the periodic pressure disturbance of the vortex field on the preset area, a micro-vibration signal is generated, and the micro-vibration signal contains vortex characteristic information.

[0085] Optionally, step 102 can specifically include the following steps:

[0086] Step 1021, the periodic pressure disturbance is applied to the ground surface of the preset area to convert into a periodic mechanical action force on the ground surface medium;

[0087] Step 1022, the periodic mechanical action force causes the ground surface medium to produce an elastic deformation synchronous with the pressure change of the vortex field, wherein the elastic deformation propagates in a preset direction in the form of a stress wave in the ground surface medium;

[0088] Step 1023, the stress wave is applied to the sensing optical fiber buried in the ground medium, so that the sensing optical fiber generates corresponding mechanical vibration according to the periodicity of the stress wave;

[0089] Step 1024, the corresponding mechanical vibration of the sensing optical fiber is recorded as a micro-vibration signal.

[0090] In the above scheme, the micro-vibration signal refers to a weak physical signal generated by mechanical vibration, used to carry eddy current field characteristic information, obtained by vibration sensor acquisition;

[0091] The eddy current characteristic information refers to the airflow field characteristic data contained in the vibration signal, used to identify the motion state of the unmanned aerial vehicle, obtained by signal analysis extraction;

[0092] The ground medium refers to a layer of soil material covering the sensing optical fiber, used to transmit mechanical vibration, and the composition is determined by geological exploration;

[0093] The periodic mechanical force refers to the thrust generated by the regular change of pressure on the ground, used to excite soil vibration, obtained by the pressure-force conversion relationship;

[0094] The pressure change refers to the phenomenon that the air pressure fluctuates with time, used to drive the deformation of the medium, obtained by monitoring the pressure sensor;

[0095] Elastic deformation refers to the recoverable deformation of an object under external force, used to propagate vibration energy, generated by the material mechanics characteristics;

[0096] The stress wave form refers to the propagation form of mechanical stress in the medium, used to transport vibration signals, described by wave equation;

[0097] The preset direction refers to the specific direction of vibration wave propagation, used to guide the sensing optical fiber, determined by the laying direction of the optical fiber;

[0098] Mechanical vibration refers to the reciprocating motion of an object around the balance position, used to generate physical signals, excited by mechanical action.

[0099] In the scheme, firstly, through the pressure conduction mechanism, the periodic pressure disturbance uniformly acts on the unit area of the ground surface medium in the form of pressure, and the corresponding periodic mechanical action force is generated according to the conversion of the acting area; the pressure sensor monitors the pressure value in real time, and the accurate mechanical action force value is calculated combined with the preset acting area parameter; secondly, based on the medium elastic deformation principle, the periodic mechanical action force makes the internal particles of the ground surface medium produce reciprocating displacement, and the reciprocating displacement propagates in the preset direction in the form of stress wave along the internal medium, and the propagation path of the stress wave can be tracked by monitoring the motion state of the medium particles in the propagation process; then through the solid coupling energy transmission, when the stress wave propagates to the contact interface of the sensing optical fiber and the soil, the fluctuating mechanical energy is completely transmitted to the sensing optical fiber through the interface shear force, according to the wave transmission principle, the sensing optical fiber produces forced vibration with the same frequency as the wave frequency under the action of the stress wave, and the vibration amplitude is proportional to the stress wave intensity; finally, the vibration signal acquisition technology is used, the acceleration sensor installed on the sensing optical fiber detects the mechanical vibration, the acceleration sensor converts the vibration acceleration signal of the sensing optical fiber into displacement signal through the integration circuit, and then generates digitized micro-vibration signal through the analog-digital converter, so as to complete the complete conversion process from physical vibration to electrical signal.

[0100] Exemplarily, the specific embodiment of the above scheme is that the periodic pressure disturbance generated by the unmanned aerial vehicle flying above the sensing optical fiber acts on the specific position of the sensing optical fiber buried area; when the periodic pressure disturbance acts on the ground surface at a specific frequency, according to the mechanical conduction principle, the corresponding periodic mechanical action force is generated in the soil layer below the pressure acting point; the periodic mechanical action force makes the soil particles produce elastic deformation, and the deformation propagates along the sensing optical fiber in the form of stress wave; when the wave conduction reaches the sensing optical fiber with a buried depth of 0.3 meters, the optical fiber generates mechanical vibration with the same frequency, and the vibration sensor finally outputs the micro-vibration signal containing the characteristic parameters of the unmanned aerial vehicle rotor.

[0101] This step realizes high-fidelity conversion from pressure disturbance to vibration signal through a complete physical conduction chain, establishes a reliable corresponding relationship between aerodynamic effect and mechanical vibration signal, ensures the complete retention of vortex field characteristic information, and provides a high-quality data source for subsequent signal processing.

[0102] Step 103, based on the sensing optical fiber, converting the micro-vibration signal into a backscattering light signal.

[0103] Optionally, step 103 can specifically include the following steps:

[0104] Step 1031, injecting a continuous light wave into the sensing optical fiber as a distributed sensing medium;

[0105] Step 1032, causing local deformation of the sensing optical fiber by the micro-vibration signal, so that the optical phase of the continuous light wave is directly modulated at the deformation position when the continuous light wave is transmitted in the sensing optical fiber;

[0106] Step 1033, converting the mechanical vibration of the micro-vibration signal to the continuous light wave according to the change of the optical phase, to form a phase-modulated light wave;

[0107] Step 1034, collecting backscattered light generated by the phase-modulated light wave inside the sensing optical fiber to obtain a backscattered light signal.

[0108] In the above scheme, the distributed sensing medium refers to an optical fiber carrier with continuous sensing capability, which is used to realize spatially distributed signal detection and is obtained by optical fiber laying process;

[0109] The backscattered light signal refers to a scattered light signal propagating in the opposite direction of the light source, which is used to carry vibration information and is obtained by a photodetector;

[0110] The continuous light wave refers to a stable intensity laser beam, which is used to provide a detection light source and is generated by a laser;

[0111] The optical phase refers to the periodic position of the light wave in the propagation process, which is used to characterize the wave state and is obtained by interference measurement technology;

[0112] The deformation position refers to the specific section of the optical fiber where mechanical deformation occurs, which is used to locate the vibration point and is determined by optical time domain reflectometry;

[0113] The phase-modulated light wave refers to a light wave signal carrying phase information, which is used to transmit vibration data and is generated by phase modulation technology;

[0114] The backscattered light refers to the backscattered light generated due to the inhomogeneity of the medium, which is used for signal extraction and is formed by Rayleigh scattering principle.

[0115] In this scheme, first, a stable continuous light wave is generated by a laser emission system, a semiconductor laser is used as a light source, a precision temperature control system is used to keep the laser wavelength stable, a fiber coupler is used to inject the laser into the end face of the sensing optical fiber, and an optical power amplifier is used to keep the incident light power below the nonlinear threshold of the optical fiber; second, when the micro-vibration signal is transmitted to the sensing optical fiber, according to the photoelastic effect principle, the mechanical strain of the sensing optical fiber at the deformation position will cause a linear change in the refractive index, by monitoring the transmission state of the light wave in the optical fiber in real time, the change amount of the light wave phase is detected by interference measurement technology;

[0116] Then, the phase modulation technology is used to convert the phase change caused by mechanical vibration into modulation of the phase of light waves. When the phase-modulated light waves carrying vibration information are transmitted in the sensing optical fiber, each tiny scattering point in the sensing optical fiber will produce backscattered light according to the Rayleigh scattering principle. The backscattered light carries the phase modulation information in the return transmission process. Finally, the returned backscattered light signal is directly collected by a high-sensitivity photoelectric detector, the light intensity signal is converted into an electric signal, the signal conditioning circuit is used for amplifying and filtering the electric signal, the analog-to-digital converter is used for converting the analog signal into a digital signal, and finally the backscattered light signal containing vibration information is obtained. The whole process reflects the original vibration information by measuring the change of the backscattered light intensity.

[0117] By way of example, the specific embodiment of the previous scheme is obtained. When the output micro-vibration signal is transmitted to the sensing optical fiber buried in the ground, the optical fiber deforms periodically with vibration. A distributed optical fiber sensing system is used to inject continuous light waves with a wavelength of 1550 nanometers into the sensing optical fiber. In the vibration action section, the deformation of the sensing optical fiber changes the transmission phase of the laser through the photoelastic effect, and converts the mechanical vibration information into light phase change. The light wave carrying the phase information produces backscattered Rayleigh scattering light when it is transmitted in the optical fiber. The scattering light returns to the original end of the optical fiber along the original route, and is finally received by the photoelectric detection system and converted into an electric signal containing vibration characteristics, i.e. backscattered light signal.

[0118] This step realizes high-fidelity conversion of mechanical vibration to optical signal through a complete photoelectric conversion chain, realizes spatial positioning detection of vibration information by using the distributed optical fiber sensing characteristics, forms a passive transmission path from physical vibration to optical signal, and improves the reliability and anti-interference ability of signal detection.

[0119] In step 104, the backscattered light signal is phase demodulated, and the phase change amount is extracted, which corresponds to the dynamic change of the eddy current field.

[0120] Optionally, step 104 can specifically include the following steps:

[0121] In step 1041, the backscattered light signal is mixed with a preset reference light signal to generate an interference light signal.

[0122] In step 1042, the light intensity change of the interference light signal is detected, wherein the light intensity change corresponds to the phase difference between the backscattered light signal and the reference light signal.

[0123] In step 1043, the light intensity change of the interference light signal is converted into an electric signal.

[0124] In step 1044, the periodic fluctuation component caused by the micro-vibration signal is separated from the electric signal.

[0125] In step 1045, the phase change amount is obtained by restoring the phase of the backscattering light signal according to the corresponding relationship between the light intensity and the phase difference of the interference light signal.

[0126] In the above scheme, the phase change amount refers to the data of the change of the phase of the light wave with time, which is used to represent the vibration intensity and is calculated by a phase demodulation algorithm.

[0127] The dynamic change refers to the characteristic of the change of the eddy current field with time, which is used to reflect the motion state of the unmanned aerial vehicle and is obtained by real-time monitoring.

[0128] The preset reference light signal refers to the light wave signal used as a comparison reference, which is used for interference measurement and is generated by a reference light path.

[0129] The interference light signal refers to the interference pattern formed by the superposition of two light waves, which is used to detect the phase difference and is formed by the principle of light interference.

[0130] The light intensity change refers to the brightness fluctuation of the interference light signal, which is used to reflect the phase information and is obtained by photoelectric detection.

[0131] The phase difference refers to the phase offset between the two light waves, which is used to calculate the deformation amount and is obtained by analyzing the interference fringes.

[0132] The electric signal refers to the electrical parameter converted from the light signal, which is used for signal processing and is obtained by photoelectric conversion.

[0133] The periodic fluctuation component refers to the regularly changing component in the signal, which is used to extract the vibration characteristics and is obtained by signal filtering separation.

[0134] The sequence changing with time refers to the phase value arranged in time sequence, which is used to record the dynamic process and is obtained by continuous sampling.

[0135] In the present scheme, first, the backscattering light signal and the reference light signal are mixed by a 3x3 optical fiber coupler, which makes the two light waves interfere through the internal optical structure to generate three interference light signals with fixed phase difference; second, the light intensity change of the interference light signal is detected by a balanced detector, which eliminates common-mode noise by differential amplification technology and converts the light intensity difference of the two interference light signals into a high signal-to-noise ratio voltage signal, and the amplitude change of the voltage signal can accurately reflect the real-time phase difference between the backscattering light signal and the reference light signal.

[0136] Then the electrical signal is filtered by a band-pass filter. By setting the pass-band range of the filter, only the periodic fluctuation component matching the micro-vibration signal frequency is reserved. The center frequency of the band-pass filter is set according to the typical rotating speed range of the unmanned aerial vehicle rotor, and the pass-band width is determined according to the fluctuation range of the vibration frequency. Finally, a phase demodulation is performed by using a digital phase-locked loop technology. The phase difference between the input signal and the local oscillator is compared by using a phase detector, and an error signal is generated by using a loop filter to control a voltage-controlled oscillator. Finally, an accurate phase variation sequence with time is output and used as the phase variation amount.

[0137] Exemplarily, according to the obtained backscattered light signal, a 3x3 optical fiber coupler is used to mix the backscattered light signal with a reference light signal. When the unmanned aerial vehicle flies at a frequency of 25 Hz, a balanced detector detects the light intensity change of the interference light signal and outputs a voltage signal containing a 25 Hz vibration component. An effective signal is extracted by using a band-pass filter with a center frequency of 25 Hz and a bandwidth of 5 Hz. Finally, a digital sequence of the phase variation with time is obtained by using a digital phase-locked loop demodulation algorithm to process the filtered signal, and the digital sequence is the required phase variation amount, which accurately reflects the dynamic characteristics of the vortex field.

[0138] In this step, by using a 3x3 coupler structure, a balanced detection technology and a digital phase-locked loop algorithm, a complete phase demodulation system is constructed, high-precision and real-time phase variation amount extraction is realized, environmental noise interference is effectively suppressed, and a reliable phase information data source is provided for subsequent signal processing.

[0139] In step 105, the phase variation amount is encoded into a digital vortex feature sequence according to the correlation between the phase variation amount and the flight parameters of the unmanned aerial vehicle.

[0140] Optionally, step 105 can specifically include the following steps:

[0141] In step 1051, the phase variation amount is divided into a plurality of continuous time segments in chronological order.

[0142] In step 1052, a corresponding flight parameter group of the unmanned aerial vehicle is matched for each time segment, and the flight parameter group includes the flight speed and the rotor rotating speed of the unmanned aerial vehicle in the time segment.

[0143] In step 1053, the average phase variation amplitude and the dominant phase variation frequency in each time segment are bound with the matched flight parameter group to form a data unit.

[0144] In step 1054, the amplitude, the frequency and the flight parameter group in each data unit are converted into a digital code in a predetermined format in chronological order of the time segments.

[0145] Step 1055, combine the digital codes corresponding to the time segments in chronological order to obtain a digital vortex feature sequence.

[0146] In the above scheme, the UAV flight parameter refers to the state data of the UAV during flight, which is used to describe the flight characteristics and is obtained by real-time recording through the flight control system.

[0147] The digital vortex feature sequence refers to a sequence of digital codes arranged in chronological order, which is used to represent the vortex field characteristics and is generated through encoding processing.

[0148] The multiple continuous time segments refer to dividing the time axis into equal length intervals for segmented data processing, which is obtained by time window division.

[0149] The flight speed refers to the rate of horizontal movement of the UAV, which is used to reflect the flight state and is obtained through GPS or inertial measurement unit.

[0150] The rotor speed refers to the rotation speed of the UAV rotor, which is used to determine the vortex field frequency and is measured by the motor encoder.

[0151] The average phase change amplitude refers to the average strength of the phase change amount, which is used to represent the vibration size and is obtained by calculating the average value of the phase value.

[0152] The dominant phase change frequency refers to the most significant frequency component in the phase change, which is used to identify the vibration main frequency and is extracted through frequency spectrum analysis.

[0153] The data unit refers to a collection containing multiple types of data, which is used to integrate related information and is formed through data binding operation.

[0154] The digital code in the predetermined format refers to the data format arranged according to specific rules, which is used for standardized transmission and is generated through encoding algorithm.

[0155] In this scheme, first, the sliding time window algorithm is used to segment the phase change amount with a fixed time interval of 1 second, the overlapping window technology is used to ensure data continuity, and multiple continuous time segments are generated, each containing a fixed number of phase data sampling points; second, the timestamp alignment technology is used to accurately match each time segment with the UAV flight parameter through the GPS time synchronization signal of the flight control system, the database query algorithm is used to extract the flight speed and rotor speed of the corresponding time period from the flight log, and the time-synchronized flight parameter group is formed.

[0156] Then the digital signal processing algorithm is applied to statistically analyze the phase change amount in each time slice, the average phase change amplitude is obtained by calculating the arithmetic mean, the frequency spectrum analysis is performed using the fast Fourier transform algorithm, the frequency component with the maximum power spectral density is extracted as the dominant phase change frequency, and the data encapsulation technology is used to bind these characteristic parameters and flight parameters into a structured data unit;

[0157] Then the data serialization algorithm is used to convert the parameter values in each data unit into digital codes according to the predefined communication protocol, the amplitude values and frequency values of floating-point numbers and the flight parameters of integer type are uniformly encoded into binary format through data type conversion technology; Finally, the data stream splicing algorithm is applied to connect the digital codes in the order of time slices, frame synchronization technology is used to add separation marks between each coding segment, and checksum algorithm is used to ensure data integrity, and finally a digital vortex characteristic sequence with time sequence characteristics is generated.

[0158] For example, according to the specific embodiment of the previous scheme, according to the obtained phase change amount, a sliding time window algorithm is used to segment with a window length of 1 second and an overlap of 0.5 seconds; for the third segment, the flight speed of 8 m / s and the rotor speed of 1200 RPM are matched through database query; the average amplitude of 1024 phase sampling points in the time slice is 0.5 radian, and the dominant frequency of 25 Hz is obtained through FFT analysis; these parameters are encapsulated using JSON format, and after being converted into digital codes, they are spliced into a complete digital vortex characteristic sequence in time sequence.

[0159] This step converts the original phase information into a structured digital sequence through a systematic data processing process, effectively fuses the vibration characteristics and flight parameters, provides a standardized data format for remote transmission and subsequent analysis, and ensures the integrity and analyzability of the characteristic information.

[0160] Step 106, transmitting the digital vortex characteristic sequence to the remote monitoring platform through the optical fiber communication link to complete the transmission of the vortex detection micro-vibration signal.

[0161] Optionally, step 106 can specifically include the following steps:

[0162] Step 1061, encapsulating the digital vortex characteristic sequence into continuous data packets according to a preset communication protocol;

[0163] Step 1062, modulating the continuous data packets onto an optical carrier to generate an optical signal;

[0164] Step 1063, injecting the optical signal into an optical fiber communication link for transmission, and transmitting the optical signal along the optical fiber to the remote monitoring platform;

[0165] Step 1064, receiving the optical signal by the remote monitoring platform and demodulating the optical signal to restore the continuous data packet;

[0166] Step 1065, parsing the continuous data packet according to the preset communication protocol to restore the digital vortex feature sequence.

[0167] In the above scheme, the optical fiber communication link refers to an optical fiber line for optical signal transmission, used for remote data transmission, and obtained by building through an optical fiber network;

[0168] The remote monitoring platform refers to a monitoring center located at a remote end, used for receiving and processing data, and obtained by building through a computer system;

[0169] The vortex detection refers to a detection process of a vortex field, used for identifying the state of a UAV, and implemented through a sensing system;

[0170] The preset communication protocol refers to a pre-defined data transmission rule, used for standardizing data formats, and determined through protocol design;

[0171] The continuous data packet refers to a data unit arranged in sequence, used for segmented transmission, and formed through data encapsulation;

[0172] The optical carrier refers to an optical wave used for carrying information, used for signal transmission, and generated through a laser;

[0173] The optical signal refers to an optical wave carrying information, used for remote transmission, and generated through modulation technology.

[0174] In the present scheme, first, the digital vortex feature sequence is segmented into data segments of fixed length according to the TCP / IP communication protocol through a data encapsulation algorithm, a header, a checksum, and a trailer information are added to each data segment to form continuous data packets conforming to the communication specification; second, the binary signal of the continuous data packet is converted into an electrical signal through pulse code modulation technology, and the electrical signal is loaded onto an optical carrier of 1550 nm wavelength through a laser modulator to generate an intensity-modulated optical signal;

[0175] Then, the optical signal is injected into a single-mode optical fiber communication link through an optical fiber coupler, the optical signal is transmitted in the optical fiber core layer using the total reflection principle, and an erbium-doped fiber amplifier is used to periodically compensate for the loss of the optical signal in long-distance transmission to ensure the signal transmission quality;

[0176] At the remote monitoring platform end, the received optical signal is converted into an electrical signal through a photodetector, and a demodulation circuit is used to restore the original data packet stream; finally, through a protocol parsing algorithm, the data packet boundary is identified according to the preset communication protocol, the payload is extracted, the encapsulation header and trailer information are removed, and the complete digital vortex feature sequence is recombined.

[0177] Exemplarily, in the specific embodiment of the above scheme, the obtained digital vortex feature sequence is packaged and encapsulated by using a standard communication protocol at the data transmission end; necessary header information and a check code are added to each data packet to ensure the integrity of the transmission; the encapsulated data is converted into an optical signal by a laser modulator and injected into a single-mode optical fiber transmission link; the optical signal is transmitted in the sensing optical fiber to a remote monitoring center, and the optical signal is converted back into an electrical signal by an optical receiving device; the electrical signal is demodulated at the receiving end, the data packet structure is identified, the check code is verified, and the valid data is extracted; and finally the complete digital vortex feature sequence is recombined to complete reliable data transmission from the detection site to the monitoring center.

[0178] This step establishes a high-reliability transmission channel from the signal source to the monitoring center, realizes remote lossless transmission of detection data through a complete optical communication process, ensures the integrity and real-time performance of the vortex feature information, and provides a reliable data source for subsequent data analysis.

[0179] Figure 2 A structure diagram of a vortex detection micro-vibration signal transmission system based on optical fiber sensing is provided for the present application, as shown in Figure 2 The system comprises:

[0180] A control module 21 is configured to control the unmanned aerial vehicle to fly in a preset area, so that the vortex field generated by the rotation of the rotor of the unmanned aerial vehicle forms a periodic pressure disturbance to the preset area, wherein the preset area is an area where a sensing optical fiber is buried on the ground.

[0181] A generation module 22 is configured to generate a micro-vibration signal based on the periodic pressure disturbance of the vortex field to the preset area, wherein the micro-vibration signal contains vortex feature information.

[0182] A conversion module 23 is configured to convert the micro-vibration signal into a backscattering light signal based on the sensing optical fiber.

[0183] An extraction module 24 is configured to perform phase demodulation on the backscattering light signal to extract a phase change amount, wherein the phase change amount corresponds to the dynamic change of the vortex field.

[0184] An encoding module 25 is configured to encode the phase change amount into a digital vortex feature sequence according to the correlation between the phase change amount and the flight parameters of the unmanned aerial vehicle.

[0185] A transmission module 26 is configured to transmit the digital vortex feature sequence to a remote monitoring platform through an optical fiber communication link to complete the transmission of the vortex detection micro-vibration signal.

[0186] Figure 2 The vortex detection micro-vibration signal transmission system based on optical fiber sensing can perform Figure 1The implementation principle and technical effects of the micro-vibration signal transmission method based on eddy current detection and optical fiber sensing according to the embodiment are not described again. The specific operation manners of each module and unit in the micro-vibration signal transmission system based on eddy current detection and optical fiber sensing according to the embodiment are described in detail in the embodiment of the method, and will not be described in detail here.

[0187] In one possible design, Figure 2 The micro-vibration signal transmission system based on eddy current detection and optical fiber sensing according to the embodiment can be implemented as a computing device, such as Figure 3 As shown, the computing device can include a storage component 31 and a processing component 32.

[0188] The storage component 31 stores one or more computer instructions, wherein the one or more computer instructions are called and executed by the processing component 32.

[0189] The processing component 32 is configured to perform the above Figure 1 The embodiment of the micro-vibration signal transmission method based on eddy current detection and optical fiber sensing.

[0190] The processing component 32 can include one or more processors to execute computer instructions to complete all or part of the steps in the above method. Of course, the processing component can also be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, for executing the above method.

[0191] The storage component 31 is configured to store various types of data to support the operation of the terminal. The storage component can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0192] Of course, the computing device can also include other components, such as an input / output interface, a display component, a communication component, etc.

[0193] The input / output interface provides an interface between the processing component and the peripheral interface module, which can be an output device, an input device, etc.

[0194] The communication component is configured to facilitate wired or wireless communication between the computing device and other devices, etc.

[0195] The computing device can be a physical device or an elastic computing host provided by a cloud computing platform, and the computing device can be a cloud server, and the processing component and the storage component can be a basic server resource rented or purchased from the cloud computing platform.

[0196] The embodiment of the application further provides a computer storage medium storing a computer program, and the computer program can realize the above-mentioned Figure 1 The embodiment shown in the figure is a micro-vibration signal transmission method based on eddy current detection of an optical fiber sensor.

[0197] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-mentioned system, device and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be described here.

[0198] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0199] Through the description of the foregoing embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and a necessary general hardware platform, and of course, it can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the method described in each embodiment or some part of the embodiment.

[0200] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A method for transmitting micro-vibration signals based on eddy current sensing, characterized in that, include: Controlling a drone to fly within a preset area, causing the vortex field generated by the drone's rotor rotation to create periodic pressure disturbances on the preset area, wherein the preset area is an area where sensing optical fibers are buried on the ground surface; Based on the periodic pressure disturbance of the preset area by the eddy current field, a micro-vibration signal is generated, and the micro-vibration signal contains eddy current characteristic information. Based on the sensing fiber, the micro-vibration signal is converted into a backscattered light signal; The backscattered light signal is phase demodulated, and the phase change is extracted. The phase change corresponds to the dynamic change of the eddy current field. Based on the correlation between the phase change and the UAV flight parameters, the phase change is encoded into a digital eddy current feature sequence; The digital eddy current feature sequence is transmitted to a remote monitoring platform via an optical fiber communication link to complete the transmission of micro-vibration signals for eddy current detection.

2. The method according to claim 1, characterized in that, The drone is controlled to fly within a preset area, causing the vortex field generated by the drone's rotor rotation to create periodic pressure disturbances on the preset area. The preset area is a region where sensing optical fibers are buried on the ground surface, including: The drone is controlled to fly along a preset flight path at a preset cruising altitude. By continuously rotating the drone's rotor, air is pushed downward at the preset cruising altitude, thereby generating a dynamic vortex field below the drone's rotor. The dynamic vortex field impacts the surface of the preset area, causing the air pressure on the surface to change periodically with the rotation frequency of the UAV's rotor and the flight speed of the UAV, thereby generating periodic pressure disturbances.

3. The method according to claim 1, characterized in that, Based on the periodic pressure disturbance of the preset region by the eddy current field, a micro-vibration signal is generated. The micro-vibration signal contains eddy current characteristic information, including: The periodic pressure disturbance is applied to the surface of the preset area to be converted into a periodic mechanical force on the surface medium. The periodic mechanical force induces elastic deformation in the surface medium that is synchronized with the pressure change of the eddy current field, wherein the elastic deformation propagates in the surface medium in a predetermined direction in the form of stress waves. Stress waves are applied to the sensing optical fiber buried in the surface medium, causing the sensing optical fiber to generate corresponding mechanical vibrations according to the periodicity of the stress waves. The mechanical vibrations corresponding to the sensing optical fiber are recorded as micro-vibration signals.

4. The method according to claim 1, characterized in that, Based on the sensing fiber, the micro-vibration signal is converted into a backscattered light signal, including: Injecting continuous light waves into the sensing optical fiber, which serves as a distributed sensing medium; The micro-vibration signal causes local deformation of the sensing optical fiber, so that the optical phase of the continuous light wave is directly modulated at the deformation position when the continuous light wave is transmitted in the sensing optical fiber. Based on the change in optical phase, the mechanical vibration of the micro-vibration signal is converted into the continuous light wave to form a phase-modulated light wave; The backscattered light generated inside the sensing fiber by the phase-modulated light wave is collected to obtain the backscattered light signal.

5. The method according to claim 1, characterized in that, The backscattered light signal is phase demodulated to extract the phase change, which corresponds to the dynamic change of the eddy current field, including: The backscattered light signal is mixed with a preset reference light signal to generate an interference light signal; The intensity change of the interference light signal is detected, wherein the intensity change corresponds to the phase difference between the backscattered light signal and the reference light signal; The intensity change of the interference optical signal is converted into an electrical signal; Separate the periodic fluctuation component caused by the micro-vibration signal from the electrical signal; Based on the correspondence between the light intensity and phase difference of the interference light signal, the sequence of phase change of the backscattered light signal over time is reconstructed from the periodic fluctuation component, and the sequence of phase change over time is used as the phase change quantity.

6. The method according to claim 1, characterized in that, Based on the correlation between the phase change and the UAV flight parameters, the phase change is encoded into a digital eddy current feature sequence, including: The phase change is divided into multiple consecutive time segments in chronological order; Match a corresponding UAV flight parameter set to each time segment, the flight parameter set including the UAV's flight speed and rotor speed within the time segment; The average phase change amplitude and dominant phase change frequency within each time segment are bound to the matched flight parameter set to form a data unit; According to the time sequence of the time segment, the amplitude, frequency and flight parameter group in each data unit are converted into digital codes in a predetermined format; The digital codes corresponding to the time segments are combined in chronological order to obtain the digital eddy current feature sequence.

7. The method according to claim 1, characterized in that, The digital eddy current feature sequence is transmitted to a remote monitoring platform via an optical fiber communication link to complete the transmission of micro-vibration signals detected by eddy current detection, including: The digital eddy current feature sequence is encapsulated into continuous data packets according to a preset communication protocol; Continuous data packets are modulated onto an optical carrier to generate an optical signal; The optical signal is injected into the optical fiber communication link used for transmission, and the optical signal is transmitted along the optical fiber towards the remote monitoring platform. The remote monitoring platform receives the optical signal and demodulates it to recover the continuous data packets. The continuous data packets are parsed according to the preset communication protocol to recover the digital eddy current feature sequence.

8. A micro-vibration signal transmission system for eddy current detection based on fiber optic sensing, characterized in that, include: The control module is used to control the drone to fly within a preset area, so that the vortex field generated by the rotation of the drone's rotor creates periodic pressure disturbances on the preset area, wherein the preset area is an area where sensing optical fibers are buried on the ground surface. The generation module is used to generate micro-vibration signals based on the periodic pressure disturbance of the preset area by the eddy field, wherein the micro-vibration signals contain eddy characteristic information. A conversion module is used to convert the micro-vibration signal into a backscattered light signal based on the sensing fiber; The extraction module is used to perform phase demodulation on the backscattered light signal and extract the phase change, which corresponds to the dynamic change of the eddy current field. The encoding module is used to encode the phase change amount into a digital eddy current feature sequence based on the correlation between the phase change amount and the UAV flight parameters; The transmission module is used to transmit the digital eddy current feature sequence to a remote monitoring platform via an optical fiber communication link to complete the transmission of eddy current detection micro-vibration signals.

9. A computing device, characterized in that, It includes a processing component and a storage component; the storage component stores one or more computer instructions; the one or more computer instructions are invoked and executed by the processing component to implement the eddy current detection micro-vibration signal transmission method based on fiber optic sensing as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that, The device contains a computer program that, when executed by a computer, implements a method for transmitting micro-vibration signals based on eddy current sensing as described in any one of claims 1 to 7.

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