41 results about "Phase frequency response" patented technology

The invention discloses a high-precision frequency synchronization method based on cross-spectrum phase slope. The method comprises the following steps: a reference node sends a frequency information transmission signal; the common node receives the frequency information transmission signal; the common node performs mutual correlation with a reference signal generated by a local clock through matched filtering to obtain time delay information; the common node calculates a phase difference according to the time delay information and calibrates a local frequency according to the phase difference; wherein the time delay information is measured through a cross-spectrum phase slope method, and the cross-spectrum phase slope method calculates time delay according to the slope of a phase-frequency response curve of a matched filtering result. According to the high-precision frequency synchronization method based on the cross-spectrum phase slope, the problems of low phase discrimination resolution and low frequency offset resolution during frequency synchronization caused by low sampling frequency of a distributed system are solved.

The invention belongs to the technical field of optical communication, and particularly relates to a low-complexity digital pre-equalizer based on frequency domain comb pilot channel estimation. The device comprises a data sending module, a channel response test module and a digital signal pre-equalization module, the data sending module comprises an initial comb signal generation part and a frequency component phase rotation part; the channel response test module comprises a signal frequency difference estimation and recovery part and a channel amplitude-frequency and phase-frequency response test part; the digital signal pre-equalization module comprises a filtering coefficient generation part and a sending signal convolution pre-equalization part; according to the invention, a frequency domain comb pilot signal is sent to analyze channel amplitude-frequency and phase-frequency response, so that a pre-equalizer for pre-compensating channel response at a sending end is generated; the method has the characteristics of high granularity, high precision, robust transmission signal system and the like, and can be applied to various scenes such as polarization multiplexing long-distance single-carrier coherent optical transmission, mode multiplexing short-distance intensity modulation direct detection systems and the like.

The invention discloses an ultra-wideband double-compensation type phase shifter, which comprises two one-to-two switches, and a reference state branch and a phase shift state branch which are connected between the two one-to-two switches, the reference state branch comprises a magnetic coupling inductor L1, a capacitor C2, a capacitor C3 and two compensation capacitors C1, the capacitor C2 is connected from the center of the magnetic coupling inductor L1 to the ground, and the capacitor C3 is connected from the center of the magnetic coupling inductor L1 to the ground. The capacitor C3 is connected with the magnetic coupling inductor L1 in parallel to form a magnetic coupling all-pass network, the two compensation capacitors C1 are symmetrically connected to the two sides of the magnetic coupling all-pass network in series, the phase shift state branch comprises an inductance type all-pass network and two compensation inductors L4, the inductance type all-pass network comprises an inductor L2, an inductor L3 and two capacitors C4, the inductor L3 is connected to the two capacitors C4 in series in parallel, and the compensation inductors L4 are connected to the two capacitors C4 in parallel. The inductor L2 is connected to the ground at the center of the two capacitors C4 connected in series, the two compensation inductors L4 are symmetrically connected to the two sides of the inductance type all-pass network in series, the compensation capacitors C1 and the compensation inductors L4 can compensate the phase, the phase frequency response change rate is slowed down, and phase shifting under the extremely wide bandwidth is achieved.

The invention relates to the field of inter-satellite ranging, in particular to a GRACE-FO inter-satellite ranging data processing method based on improved CRN filtering, and the method comprises the steps: constructing an LRI1A data preprocessing process in a low-order gravity satellite detector, reading LRI1A-M and LRI1A-T phase measurement original data, and carrying out the phase unwrapping and time mark correction processing; calculating a gain fluctuation level at an orbit frequency, and selecting a low-pass filter design parameter index; constructing an FIR digital filter based on a window function method, calculating time domain tap coefficients of a CRN filter and an improved filter, and carrying out normalization processing at an orbital frequency; according to an LRI biased distance calculation principle, calculating an inter-satellite biased distance and an inter-satellite distance, a rate and an acceleration after low-pass filtering; zero filling is carried out on the offset distance between satellites, the amplitude-frequency response and phase-frequency response characteristics of the offset distance between the satellites are calculated, and the improved filtering algorithm has great advantages in the aspects of improving passband flatness, enhancing high-frequency noise suppression and shortening the order of the filter. According to the invention, the precision and stability of gravitational field inversion are significantly improved.

The invention relates to the technical field of wireless communication, and discloses a novel channel estimation method based on residual frequency offset elimination, which comprises the following steps of: despreading descrambled pilot frequency data to obtain a channel estimation value after noise smoothing, and transmitting the channel estimation value to an FIR (Finite Impulse Response) filter to generate a noise suppression channel estimation signal; phase-frequency response of the noise suppression channel estimation signal is obtained through calculation, conjugate multiplication and smoothing are conducted on the phase-frequency response of the noise suppression channel estimation signal and the phase-frequency response of the FIR filter, a residual frequency offset estimation signal for suppressing the noise influence is obtained and compensated to the noise suppression channel estimation signal output by the FIR filter, and a noise suppression channel estimation value for eliminating the residual frequency offset influence is obtained. And balancing with the service de-spreading signal compensated by the residual frequency offset estimation signal to obtain a final output signal. According to the method, the phase-frequency response characteristics of the filter are deeply analyzed, the FIR filter is used for improving the signal-to-noise ratio, meanwhile, the residual frequency offset is estimated through the phase-frequency characteristics of the FIR filter, finally, the phase error is compensated for, an accurate channel estimation value is obtained, and the signal detection precision is improved.

The invention discloses a transformer winding fault diagnosis and relay protection interference assessment method and device, a medium and equipment, and the method comprises the steps: obtaining an amplitude-frequency response curve and a phase-frequency response curve of a transformer in a preset frequency band, calculating the Euclidean distance in each region frequency band, and obtaining the Euclidean distances of a plurality of amplitude-frequency regions and phase-frequency regions. And according to the Euclidean distance calculation, the Euclidean distance ratio is fused, and whether the transformer winding has a fault is judged. Meanwhile, on the premise that the transformer winding has a fault, an influence evaluation factor of relay protection is calculated in combination with online operation data, and if the factor is smaller than a preset threshold value, it can be confirmed that a fault judgment result is accurate. According to the method, by considering the interference of relay protection on frequency response measurement, the problem that the interference of relay protection on the fault monitoring result of the transformer winding is not fully considered in the prior art is solved, so that the accuracy of fault judgment is ensured, and the monitoring result is prevented from being influenced by misoperation or hysteresis of relay protection.

The application discloses a spectrometer based on a random spiral grating, wherein a device layer is an optical waveguide, the device layer comprises a random spiral grating, two groups of transmission waveguides and two groups of grating couplers; incident light is coupled into the first group of transmission waveguides through the first group of grating couplers, and then is transmitted to the random spiral grating from the first group of transmission waveguides; the amplitude-frequency response of the optical signal is randomly modulated through the random spiral grating; the application further comprises a heater; the random spiral grating is non-uniformly heated by the heater, so that the temperature of the random spiral grating is changed, and the phase-frequency response of the optical signal passing through the random spiral grating is randomly changed; finally, the obtained random optical signal is transmitted to the second group of grating couplers through the second group of transmission waveguides, and is coupled out from the second group of grating couplers; the application has the advantages of micron-level size, large bandwidth and super-high resolution.

The invention discloses a servo steering engine performance parameter testing method and device and a medium, and relates to the technical field of industrial control, and the method comprises the steps: collecting the real-time feedback data of a servo steering engine, adjusting the frequency range and the frequency step length of a sweep frequency through employing a genetic algorithm, and generating a sweep frequency parameter; calculating the amplitude of the frequency sweep instruction and the amplitude of the steering engine operation feedback data based on the performance fitting data set, obtaining an amplitude-frequency characteristic curve, selecting a bandwidth frequency point when the amplitude is reduced to a specified proportion according to the amplitude-frequency characteristic curve, and generating a phase-frequency characteristic curve; analyzing the phase frequency response of the target frequency point according to the phase frequency characteristic curve, judging whether the phase requirement is met or not, obtaining the bandwidth qualification state, evaluating the overall performance of the servo steering engine, and generating a performance evaluation report. According to the invention, the automation and flexibility of the test process are improved, and the test efficiency and performance of the industrial control system are further optimized.

The invention relates to the technical field of electric steering engine control, in particular to a method and equipment for coordinating amplitude-frequency and phase-frequency responses of an electric steering engine and a medium. The method comprises the steps of obtaining a first control instruction of the electric steering engine, and obtaining an instruction identification frequency based on the instruction; feed-forward and dead-zone compensation coefficients are obtained based on the instruction identification frequency; performing low-pass filtering on the first control instruction to obtain a second control instruction; a feedback result of operation of the electric steering engine based on the second control instruction is obtained, and first control output is obtained according to a PID control algorithm; obtaining a second control output based on a feed-forward compensation algorithm, the second control instruction and a feed-forward compensation coefficient; obtaining a third control output based on a dead-zone compensation algorithm, the first control output, the second control output and the dead-zone compensation coefficient; and adjusting the amplitude-frequency and phase-frequency response of the electric steering engine according to the first control output, the second control output and the third control output. Therefore, the problem that the synchronous improvement of the amplitude-frequency response and the phase-frequency response of the electric steering engine has conflicts is solved.

This invention discloses a low-overhead error calibration method and apparatus for array optical digitization systems. Addressing the issues of synchronization errors, mixing phase errors, and optical time-domain demultiplexing crosstalk errors that easily occur in multi-channel structures and synchronization processing of ultra-wideband array optical digitization systems, this invention proposes for the first time a method for joint extraction and correction based on the phase-frequency response differences of these three types of errors through a single injection of multi-frequency signals. This invention establishes a global error model for the array optical digitization system. By acquiring and analyzing the phase-frequency response of the decoupled signal through a single signal input, various major errors can be accurately separated and compensated, eliminating the need for complex iterative processes and additional reference paths, thus significantly simplifying the calibration process. This method effectively improves array channel consistency and digital beamforming accuracy, and has significant implications for enhancing the real-time performance and large-scale scalability of array photonic digitization systems. This invention is applicable to array optical digitization systems in various high-channel-count, wideband application scenarios.

The application is based on a SERF gyroscope multi-parameter measurement method of magnetic field phase frequency response, first measuring B y The phase frequency characteristic curve of the alternating magnetic field response is obtained through a lock-in amplifier y The response phase of the SERF atomic spin gyroscope under the alternating magnetic field is zero; different amplitude direct current magnetic fields are applied to the z axis respectively, the above process is repeated, and then B y The linear fitting of the zero-phase frequency value of the alternating magnetic field response can obtain the accurate values of the electronic magnetic field and the slowing-down factor. The method can realize the accurate measurement of the electronic magnetic field, the nuclear spin magnetic field, the slowing-down factor and the alkali metal atom density of the SERF atomic spin gyroscope in a very short time without causing the relaxation of the SERF atomic spin gyroscope.

The invention provides a consistency test method, device, system and equipment and a readable storage medium, and the method comprises the steps: obtaining a reference signal sequence and a to-be-tested signal sequence, the reference signal sequence and the to-be-tested signal sequence are electric signals synchronously generated by the reference microphone and the to-be-tested microphone in response to the same preset audio test signal respectively; according to the reference signal sequence and the to-be-tested signal sequence, obtaining a transfer function from the to-be-tested microphone to the reference microphone; based on the transfer function, calculating amplitude-frequency response and phase-frequency response of the microphone to be tested relative to the reference microphone; and obtaining a consistency test result of the microphone to be tested according to the amplitude-frequency response and the phase-frequency response. The objective and quantifiable consistency evaluation method provided by the invention can identify the fine consistency deviation which cannot be found only by an absolute performance test from a more comprehensive performance perspective, and realizes the automatic evaluation of the microphone consistency.

The invention discloses a capacitor microphone phase frequency response calibration device and method based on an electrostatic excitation method, and the device comprises a signal source which is used for outputting a variable frequency electric signal; the electrostatic exciter power supply is used for amplifying the variable-frequency electric signal; the electrostatic exciter is used for generating constant electrostatic pressure on a vibrating diaphragm of the microphone; the microphone is used for outputting an acoustic-electric conversion signal under the action of the electrostatic exciter; the pre-amplifier is used for amplifying the signal and then outputting the signal; the adaptive amplifier is used for outputting an output electric signal of the pre-amplifier to the multi-channel sound analyzer; the multi-channel sound analyzer is used for analyzing and processing the received electric signal; and the computer is used for controlling the amplitude, the frequency and the duration of the variable-frequency electric signal output by the signal source. According to the invention, a dual-channel electrostatic exciter synchronous generation design is adopted, electrostatic excitation field signals with consistent phases are synchronously generated, rapid calibration of the relative phase frequency response of the condenser microphone is realized, and the problem of phase calibration of the condenser microphone is solved.

This application discloses an optical domain decoupling amplitude-frequency response equalization optimization method and apparatus. First, a system-level calibration is performed on the optoelectronic link, which includes an arbitrary waveform generator, intensity modulator, photodetector, and oscilloscope, to obtain the overall frequency response of the link, including amplitude and phase frequency responses. Then, the transmitter amplitude-frequency response is obtained through optical domain scanning and normalization. The receiver amplitude-frequency response is separated from the overall amplitude-frequency response through decoupling operations. Finally, a transmit-receive domain equalization strategy is used to complete transmit signal pre-distortion compensation and receive signal de-embedding compensation, respectively. This successfully achieves a balance between testing cost, testing time, and equalization performance, realizing low-cost, high-efficiency, and high-performance frequency response decoupling and equalization compensation for IMDD high-speed optical links. It provides an efficient, economical, and high-performance solution for the research and testing of IMDD high-speed optical modules.

This application provides a virtual playback simulation method, apparatus, device, and medium, relating to the fields of audio signal processing and audio playback device simulation technology. The method includes: acquiring an input audio signal and complex frequency response data of a target audio playback device, the response data including amplitude frequency response data and phase frequency response data; adaptively selecting a target algorithm from multiple preset virtual playback simulation algorithms according to preset application constraints; the multiple preset algorithms have different delay characteristics, accuracy levels, and computational complexity, and at least one algorithm adopts a frequency resolution processing method matching the characteristics of human auditory perception; using the target algorithm, processing the input audio signal based on the complex frequency response data to generate an output audio signal simulating the playback effect of the target audio playback device. This application improves the flexibility, accuracy, real-time performance, and perception optimization effect of virtual simulation through the organic combination of adaptive algorithm selection and auditory perception optimization.

The present application provides a method and device for determining the steady-state frequency response of an MHD angular velocity sensor element. The method comprises: obtaining structural dimension parameters and material property parameters of the MHD angular velocity sensor element in response to a modeling instruction; generating an average magnetic induction intensity of a radial magnetic circuit in a conductive fluid ring in the MHD angular velocity sensor element based on the Maxwell equations according to the structural dimension parameters and the material property parameters; generating an average circumferential velocity of the conductive fluid relative to the magnetic field based on a low magnetic Reynolds number incompressible equation group according to the structural dimension parameters and the material property parameters; generating a frequency response characteristic function of the MHD angular velocity sensor element based on the average magnetic induction intensity and the circumferential average velocity based on the Faraday motional electromotive force method; and solving the frequency response characteristic function to obtain amplitude-frequency response data and phase-frequency response data of the MHD angular velocity sensor element.

The present application discloses a photon computing device that can correct errors in space-frequency domain parallelism, and relates to the field of photon computing technology. The device includes: receiving a plurality of multi-wavelength optical signals, and performing a first matrix operation on each input multi-wavelength optical signal; during the processing, an amplitude phase frequency response control unit uses the periodic response of a micro-ring structure in the frequency domain to perform frequency array processing on each multi-wavelength optical signal; and performs optical switching processing and / or a second matrix operation processing on the processed optical signal to obtain a target optical signal. The present invention uses the periodic response of the amplitude phase frequency response control unit in the frequency domain to perform frequency domain array processing on each optical signal, so that the target optical signal can be obtained based on the processed optical signal, solving the technical problems that the optical processing of the photon computing system in the prior art cannot realize monitoring and error correction of the processing process, resulting in low reliability, and cannot fully utilize the space domain and frequency domain, resulting in low processing efficiency.

Method for determining a function state (FZ) of an ultrasonic sensor (2) for a vehicle (1), having the steps of: a) applying (S1) an electrical test signal (P) to the ultrasonic sensor (2); b) detecting (S2) an electrical response signal (A) from the ultrasonic sensor (2); c) determining (S3) a phase-frequency response (PF) comprising the phase angle (α) of the detected response signal (A) for the applied test signal (P) on the basis of an excitation frequency (f) of the applied test signal (P); d) comparing (S4) at least a first phase angle (P1) below and a second phase angle (P2) above a resonant frequency (R) in the determined phase-frequency response (PF) with a respective expected phase angle (PE1, PE2); e) correcting (S5) the determined phase-frequency response (PF) on the basis of the comparison; and f) determining (S6) the function state (FZ) on the basis of the corrected phase-frequency response (PFK).

The present invention discloses a design method and system for a channel equalizer with flexible controllability of frequency response error, belonging to the technical field of digital array channel equalizer design, and solving the problem that the prior art cannot flexibly control the fitting errors of the channel amplitude-frequency and phase-frequency responses; by constructing convex constraint conditions for the amplitude-frequency and phase-frequency response fitting errors, the channel equalizer design problem is transformed into a second-order cone programming optimization problem that can obtain a global optimal solution, and the design method has strong robustness and is convenient for practical engineering applications; at the same time, compared with the frequency-domain least squares design method, the channel equalizer design method provided by the present invention can independently and flexibly control the fitting errors of the channel amplitude-frequency response and phase-frequency response. When the engineering implementation resources are limited, appropriately relaxing the fitting error of the amplitude-frequency (or phase-frequency) response can obtain a higher-precision fitting error of the phase-frequency (or amplitude-frequency) response, and the control is flexible.

This invention discloses a method for testing the frequency characteristics of intelligent transformers based on smart grids, belonging to the field of power system testing technology. The method includes: injecting a sweep frequency excitation signal into the winding of the transformer under test and simultaneously acquiring the response signal to obtain amplitude-frequency and phase-frequency response data; performing logarithmic transformation and median filtering preprocessing on the amplitude-frequency data; constructing a high-order rational fractional transfer function model using a vector fitting algorithm; extracting complex poles and calculating the quality factor to construct a multi-dimensional pole distribution map; introducing a pre-constructed frequency band sensitivity matrix to divide the entire frequency band into characteristic frequency bands and preliminarily determine axial displacement faults in the winding coil; performing coordinate registration between the current pole map and the reference fingerprint pole set, calculating the offset vector, and diagnosing the defect type based on multiple criteria to generate a report. This invention can effectively suppress noise interference from complex electromagnetic environments, provide quantitative damage diagnosis indicators, and achieve highly sensitive and fully automated assessment of the mechanical state of transformer windings.

The invention provides a magnetotelluric detection interference suppression method and device, electronic equipment and a storage medium, is applied to a magnetotelluric sounding system, and relates to the technical field of data processing. The method comprises the following steps: decoding original data of magnetotelluric sounding; wherein the decoded original data comprises electric field data and magnetic field data; performing noise reduction processing on the decoded original data; wherein the noise reduction processing comprises the steps of filtering power frequency interference, eliminating a direct current component, removing low-frequency trend interference and deducting equipment amplitude phase frequency response; carrying out the normalization processing of the original data after noise reduction, carrying out the impedance estimation, and determining the parameters corresponding to the original data of the magnetotelluric sounding; wherein the parameters at least comprise one of impedance tensor, apparent resistivity, impedance phase and tipper information; and through various noise reduction means, the amplitude and phase reliability of the signal at the natural electromagnetic field analysis frequency is improved, so that the impedance estimation precision is improved.

The invention discloses a high-precision rapid in-situ measurement device and method for polarization parameters of an atomic common magnetometer, and belongs to the technical field of quantum precision measurement and ultrahigh-sensitivity inertial measurement. Based on an atom manipulation technology, a transverse modulation magnetic field is applied to an atom ensemble through a three-axis magnetic field coil, a lock-in amplifier is adopted to extract device output phase frequency response, a longitudinal axis magnetic field is gradually scanned until the minimum phase frequency response is obtained, and therefore a nuclear spin polarization equivalent magnetic field and an electron spin polarization equivalent magnetic field are obtained. And further obtaining the electron spin polarizability, the nuclear spin polarizability and the nuclear spin longitudinal relaxation time. According to the invention, the rapid in-situ measurement of the atom ensemble polarization parameters of the SERF gyroscope is realized, and the measurement precision is improved.

The present application relates to a kind of methods for measuring the amplitude-frequency and phase-frequency response of radio frequency cavity, comprising: the digital radio frequency low level system generates sawtooth wave pulse frequency signal, and generates frequency control word;The digital radio frequency low level system generates sine data sequence and cosine data sequence according to the frequency control word, and the sine data sequence and the cosine data sequence are quadrature modulated, the output of the quadrature modulation is converted to digital-analog after output to the power source, and then the power amplifier is carried out power amplification and the directional coupler coupling after generation radio frequency signal input to the radio frequency cavity;The digital radio frequency low level system obtains the cavity pressure signal of the radio frequency cavity, and the forward voltage signal and reverse voltage signal of the directional coupler;The digital radio frequency low level system carries out real-time signal processing according to the cavity pressure signal, the forward voltage signal and the reverse voltage signal, and obtains the amplitude-frequency and phase-frequency response curve of the radio frequency cavity.

The embodiment of the application discloses a voice coil motor hysteresis modeling method and a related product, wherein the steps of the method comprise: determining a transfer function relationship between an output displacement and an input current, determining a phase frequency response and an amplitude frequency response relationship according to the transfer function relationship between the output displacement and the input current; and based on the phase frequency response and the amplitude frequency response relationship, fitting a voice coil motor hysteresis trajectory by using a neural network to obtain a voice coil motor hysteresis model. The scheme disclosed in the application can effectively describe the hysteresis phenomenon exhibited by the voice coil motor when the output millimeter-level displacement is output, and the description effect of the model basically remains unchanged with the change of the frequency, and the scheme has a more stable dynamic trajectory tracking effect than a pure NARX neural network model.

The application discloses a small frequency difference MEMS gyroscope detection phase shift suppression system, which is composed of a MEMS gyroscope, a driving loop, an angular velocity demodulation module and a parametric suppression loop. The application focuses on applying a parametric suppression signal to the detection resonator, electrostatically correcting the amplitude-phase frequency response, suppressing the detection phase shift under the small frequency difference mode, and improving the impact resistance. The detection resonator is embedded in the parametric suppression loop to generate stable amplitude self-excitation oscillation. A band-pass phase shifter is used to generate a parametric suppression signal twice the detection frequency from the detection amplitude multiplier. After the phase is shifted by 90 degrees to meet the parametric suppression phase condition, the parametric suppression signal acts on the parametric suppression electrode. Without losing the mechanical sensitivity of the MEMS gyroscope, the detection phase shift and the resonance peak amplitude at the detection natural frequency are suppressed, and the impact resistance is improved.

The application belongs to the technical field of optical communication, and particularly relates to a low-complexity digital pre-equalizer based on a frequency-domain comb pilot channel estimation. The application comprises a data sending module, a channel response testing module and a digital signal pre-equalization module. The data sending module comprises an initial comb signal generation and a frequency component phase rotation. The channel response testing module comprises a signal frequency difference estimation and recovery and a channel amplitude-frequency and phase-frequency response testing. The digital signal pre-equalization module comprises a filter coefficient generation and a sending signal convolution pre-equalization. The application analyzes the channel amplitude-frequency and phase-frequency responses by sending a frequency-domain comb pilot signal, and generates a pre-equalizer for pre-compensating the channel response at a sending end. The application has the characteristics of high granularity, high precision, robust transmission signal system and the like, and can be applied to various scenes such as polarization multiplexing long-distance single-carrier coherent optical transmission and mode multiplexing short-distance intensity modulation direct detection systems.

The application discloses a transformer winding short-circuit state detection method based on pulse frequency response curve characteristics, first extracts the anti-resonance point of the amplitude-frequency response curve and the L-C zero-crossing point of the phase-frequency response curve to carry out function fitting, calculates amplitude-phase coexistence fitness TS, judges whether the winding to be detected is faulty or not; then carries out gray scale transformation on the pulse frequency response curve image, calculates image metric relationship TC, distinguishes winding inter-turn short circuit or winding capacitor fault; after judging the winding capacitor fault, calculates the gray scale-gradient coexistence rate TM of the pulse frequency response curve image, and distinguishes winding inter-turn short circuit or pie inter-turn short circuit.

The invention discloses a hearing aid earplug sound leakage ultrasonic characteristic diagnosis method based on an intelligent sensor, and relates to the technical field of nondestructive testing, and the method comprises the steps: collecting the initial state data of a hearing aid, executing signal modulation and parameter calibration, and obtaining an earplug configuration and control list; according to the earplug configuration and control list, transmitting an ultrasonic detection signal to the hearing aid earplug, synchronously acquiring echo time domain data, and executing fast Fourier transform to generate an amplitude-phase frequency response curve; and performing feature crude extraction on the amplitude-phase frequency response curve by using an envelope detection method to form acoustic impedance anomaly spectrum features. Through the constructed loss acoustic model, accurate inversion of the leakage rate is realized, the diagnosis accuracy is remarkably improved, defect classification is performed by adopting an SVM algorithm, the sealing performance test instruction is generated according to a preset rule, closed-loop control from diagnosis to execution is realized, and the detection efficiency is remarkably improved.

The application discloses a kind of thermal coupling decoupling measurement methods based on composite sensitive structure, it is related to extreme environment sensing measurement technical field, provide composite sensitive structure: composite sensitive structure from bottom to top includes substrate, thermoelectric pile film formed on substrate, heat insulation layer formed on thermoelectric pile film, and piezoelectric film formed on heat insulation layer;Dynamic response characteristic matrix of composite sensitive structure is constructed: the thermal coupling coefficient between piezoelectric film and thermoelectric pile film when pressure and thermal excitation act simultaneously is calculated, and dynamic response characteristic matrix is constituted by amplitude-frequency response coefficient, phase-frequency response coefficient and thermal coupling coefficient.The application adopts the technical route of composite sensitive structure, dynamic characteristic matrix and frequency domain decoupling, solves the problem that traditional method is difficult to separate thermal coupling signal in real time from measurement principle, realizes the synchronous measurement of dynamic pressure and transient temperature under extreme environment.