548 results about "Full wave" patented technology

The invention relates to the technical field of electromagnetics, in particular to an ultra-wideband full-polarization large-angle beam scanning theory based on an electromagnetic metasurface, which comprises the following steps of: S1, regulating and controlling a beam far-field phase based on an array global reference phase; s2, adjusting and controlling far-field orthogonal polarization vector field superposition based on array factors to realize full-polarization beam control; and S3, theoretical calculation verification of full-polarization beam regulation and full-wave simulation verification of the full-polarization beam. According to the invention, a novel full-polarization wave beam regulation and control theory based on array factor regulation and control orthogonal polarization vector field superposition is provided, and theoretical calculation and full-wave simulation are carried out on the provided full-polarization wave beam regulation and control theory; according to the theory, the effectiveness and universality of realizing ultra-wideband and large-angle full-polarization beam regulation and control by only using one-bit phase resolution are verified.

The invention relates to the technical field of reservoir prediction, in particular to a high-resolution reservoir prediction method under seismic full-wave information mining. The method comprises the following steps: acquiring seismic full-wave information data; performing frequency domain conjoint analysis on the seismic full-wave information data to generate a multi-scale full-wave feature tensor; performing seismic full-wave signal multi-scale decoupling on the multi-scale full-wave feature tensor to generate seismic multi-wave field separation data; implicit reservoir feature mapping is carried out on the seismic multi-wave-field separation data to generate initial reservoir feature mapping data; performing nonlinear correlation analysis on the initial reservoir feature mapping data to generate high-order reservoir feature data; and performing inversion linkage optimization on the high-order reservoir feature data and the seismic multi-wave-field separation data to generate reservoir dynamic response optimization data. According to the method, through multi-wave-field information extraction, high-resolution reservoir detail display, dynamic reservoir change prediction and confidence evaluation, the accuracy and resolution of reservoir prediction are improved.

The invention discloses an electromagnetic simulation multi-scale region segmentation method based on deep learning, and the method comprises the steps: constructing and training a deep learning model which is used for recognizing a key region and a non-key region in an electromagnetic simulation region; in the training process, a data set is labeled, and the model performance is optimized by using a cross validation method; simulating the key area by adopting a full-wave solution method to obtain field distribution of the key area; simulating the non-critical area by adopting a high-frequency approximation method, and simulating an electromagnetic field generated after an incident wave is reflected by the surface of an object; dynamic boundary conditions are generated at the boundary of the key area and the non-key area, and continuity and consistency of field values are ensured. According to the method, in a large-scale electromagnetic simulation scene, through combination of deep learning and a mixed solution strategy, optimal configuration of computing resources is achieved, limited computing force is focused on a high-precision demand area, and simulation efficiency and overall performance are remarkably improved.

The invention relates to a multi-modal multifunctional composite metasurface design method and device and a medium, and the method comprises the steps: carrying out the parameterized sampling of the key size of a unit structure through Latin hypercube sampling, and generating a training sample set; electromagnetic simulation is carried out on the sampled structure to obtain two-state electromagnetic response data, and a mixed variable database is obtained; according to the target response, generating a plurality of groups of candidate structures through a generator in the improved conditional variation auto-encoder generative adversarial network, screening the candidate structures through a predictor, calculating a prediction comprehensive error, and selecting a preset number of candidate structures with the minimum prediction comprehensive error to perform full-wave simulation verification; and obtaining a simulation double-state response, calculating a simulation comprehensive error, and judging the current candidate structure according to a preset comprehensive error threshold value. Compared with the prior art, the method has the advantages of multi-state collaboration, low calculation cost, high degree of freedom and the like.

The invention relates to a sparse antenna array synthesis method based on neural network intelligent solution, and the method comprises the steps: carrying out the full-wave simulation of an antenna unit according to an array synthesis requirement, obtaining a unit active directional diagram, and constructing a unit active directional diagram database; constructing an initial sample set according to the unit active directional diagram and the array numerical simulation model; randomly dividing the initial sample set into a training set and a verification set, carrying out offline training by utilizing the training set, and carrying out array comprehensive solution on verification set data; judging whether the resolving result meets the arraying requirement or not, if not, adopting a convex optimization algorithm to assist calculation, updating the data set, and retraining; otherwise, outputting the neural network model; and through the model, according to the unit spacing constraint and the active directional diagram, sparse antenna array synthesis is carried out, and array topology is output. The method can achieve the comprehensive settlement of the antenna array, is high in speed, is high in efficiency, and better accords with a real array working environment.

The embodiment of the invention discloses a transformer invisible fault diagnosis method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring voltage and current recording data of a transformer measured on line; performing influence factor elimination operation on the voltage and current recording data, specifically comprising the following steps of: eliminating a higher harmonic component, a direct current component and an attenuation direct current component by adopting a full-wave differential Fourier algorithm to obtain a fundamental wave voltage and a fundamental wave current; when the elliptical orbit is calculated, normalization processing is carried out on different loads; eliminating the influence of abnormal numerical values by adopting a Gaussian regression algorithm; constructing a voltage difference and current elliptic track by using a transformer port relational expression compensated by the exciting current; correcting the elliptical trajectory by using the primary side voltage data, the secondary side voltage data and the primary side current data of the two groups of transformers measured within the sampling time; and after the operation of eliminating the influence factors, realizing the recognition and diagnosis of the invisible fault of the transformer through Lissajous ellipse fitting, characteristic quantity extraction and an artificial intelligence inversion algorithm.

The invention provides an antenna structure, which comprises a first radiation branch knot, a second radiation branch knot, a third radiation branch knot and a reflection branch knot, wherein the second radiation branch knot and the first radiation branch knot are adjacent to each other, are arranged at an interval and form a full-wave dipole antenna, and the full-wave dipole antenna supports receiving and transmitting of electromagnetic wave signals of a preset frequency band. The third radiation branch knot is in a ring shape with a gap, and the third radiation branch knot is connected between the first radiation branch knot and the second radiation branch knot. The reflection branch is located on the side, away from the first and second radiation branches, of the third radiation branch, and is spaced and coupled with the third radiation branch. The invention further provides antenna glass and equipment. According to the invention, directional radiation can be realized through a simple structure.

The invention relates to a topological photonic crystal-based optical filter design method, equipment and medium, and the method comprises the steps: constructing a periodically arranged photonic crystal flat plate, and enabling a super unit to be composed of a topological non-trivial unit and a topological trivial unit, and the topological characteristic and the arrangement mode of the topological non-trivial unit are determined by calculating the two-dimensional bundling phase so as to form a topological defect state. And then, by adjusting the width of the air micropores and the defect spacing, the flatness and the coupling strength of a defect state energy band are optimized, and the stability of the resonant wavelength is ensured. Full-wave electromagnetic simulation is adopted to test transmission spectrums under different incident angles, the angle insensitivity characteristic of resonant wavelength is verified, and key structure parameters are iteratively optimized. Finally, an optical filter with efficient filtering, low energy consumption, high integration level and anti-interference capability is output, and the optical filter is widely applied to the fields of optical communication, optical sensing, high-precision spectral analysis and the like.

The invention provides a microstrip line fan-shaped branch connector, an optimization method thereof and a radio frequency front-end module, and the optimization method comprises the steps: carrying out the parameterization of a structure parameter of the microstrip line fan-shaped branch connector, and obtaining parameter data; performing electromagnetic full-wave simulation on the parameter data to obtain a first function value; judging whether the first function value accords with a preset function value or not; if yes, outputting structural parameters of the microstrip line fan-shaped branch connector according to the parameter data; and if the parameter data does not conform to the preset function value, substituting the parameter data into a genetic algorithm for repeated updating and electromagnetic full-wave simulation until a final function value conforming to the preset function value is obtained, and outputting structural parameters of the microstrip line fan-shaped branch connector according to the parameter data corresponding to the final function value. According to the optimization method, automatic optimization of the microstrip line fan-shaped branch connector is realized, the design efficiency can be improved, the consumed time is short, the design process can be simplified, and the flexibility during adjustment is higher.

The invention discloses an on-line monitoring and early warning method for a bus capacitor of an electric driving system, and belongs to the field of electric driving systems. The electric driving system sequentially comprises an isolating circuit, a full-wave bridge rectifier, a bus capacitor bank, an inverter, an actuator and a capacitance online testing device; the capacitor online testing device comprises a relay, a load resistor, a voltage acquisition module, a current acquisition module and a master control calculation unit. When the electric drive system is idle, a load resistor is connected to construct a test path, and current and voltage signals are collected; disconnecting a test path, constructing a degradation characterization quantity of multi-index information fusion through time-frequency domain feature extraction, and constructing an equal-length time interval sequence degradation curve; and the TCN-BRU-GRU combined prediction model carries out trend feature learning and training on the degradation curve. According to the method, waveform fitting and local and global data feature capturing of non-equal-interval time sampling are achieved, trend prediction of bus capacitor performance degradation is achieved, early warning is conducted before failure of the bus capacitor, and safe and reliable operation of an electric drive system is guaranteed.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

The invention discloses a superconducting rectifier, a superconducting diode and a manufacturing and control method thereof, and belongs to the technical field of superconducting electronics, the superconducting rectifier comprises more than one superconducting diode, the superconducting diode comprises an insulating substrate and a superconducting nanowire, the superconducting nanowire is provided with a narrowing section, and the narrowing section is provided with a narrow section. The narrowing section is connected with a first gate line and a second gate line, the first gate line and the second gate line are symmetrically arranged, and the first gate line and the second gate line are both perpendicular to the superconducting nanowire. According to the invention, in-situ reconfigurable reversal symmetry destruction can be realized through a nanoscale hot spot controlled by a grid electrode; electrically controlled opening or closing and polarity reversal are realized by adjusting a small grid current without changing a magnetic field; the superconductive rectifier realizes electrically reconfigurable full-wave and half-wave rectification, and paves a way for development of extensible and electrically programmable superconductive electronic devices.

The utility model discloses a balun-integrated full-wave oscillator radiation unit, and aims to solve the problems that a low-frequency bowl-shaped oscillator and a high-frequency die-cast half-wave oscillator are used in the conventional high-low frequency nesting scheme, so that the requirements of miniaturization and light weight of an antenna are difficult to meet, the processing cost is extremely high, and the cost is low. And meanwhile, the high-frequency oscillator is arranged in the bowl-shaped oscillator, so that the horizontal plane wave width deformation of the high-frequency oscillator is caused, the gain is influenced, and the market demand cannot be met. The Balun-integrated full-wave oscillator radiation unit comprises a fixed support and a PCB radiation plate installed on the fixed support. The structure of the full-wave oscillator is relatively simple, assembly can be completed only by installing the single-balun integrated feed sheet in the fixing support and welding and fixing the single-balun integrated feed sheet and the PCB radiation plate, miniaturization design can be achieved through the microstrip technology, the printed circuit technology and the like due to the fact that single-face embedded coupling is adopted, the requirement of miniaturization equipment is met, machining is easy, and cost is low. The production efficiency can be greatly improved, and the production cost is reduced.

A method for performing an elastic full wave inversion (FWI) includes generating an initial P wave velocity model. The method also includes producing a subsurface seismic image or an image gather based upon the initial P wave velocity model. The method also includes estimating elastic properties based upon the subsurface seismic image or the image gather. The method also includes performing elastic full wave inversion (FWI) on the initial P wave velocity model and the elastic properties to produce updated elastic properties.

The invention discloses a method for inverting the velocity of a cementing medium after casing based on ultrasonic Lamb waves, and relates to the field of geophysical logging. According to the method, ultrasonic Lamb wave logging and ultrasonic pulse reflection logging are carried out at all depth points through a post-casing scanning imaging logging instrument, waveform records at all the depth points are obtained, the thickness of a casing in the specified direction at all the depth points and acoustic impedance of a post-casing cementing medium are calculated in an inversion mode, and then the thickness of the casing in the specified direction at all the depth points and the acoustic impedance of the post-casing cementing medium are calculated on the basis of the ultrasonic Lamb wave logging waveform records. For each specified orientation of each depth point, Fourier transform is carried out on the full waveform of the near-bending Lamb wave and the full waveform of the far-bending Lamb wave, the phase difference of the far-bending Lamb wave and the far-bending Lamb wave is calculated, group delay processing is carried out, the working frequency band of the imaging logging instrument is scanned after combination, and the phase difference of the far-bending Lamb wave and the near-bending Lamb wave is calculated; and frequency values corresponding to the minimum values of the group delays at all the directions of all the depth points are obtained, and after a frequency set is obtained, the wave velocity and the medium type of the cementing medium after casing are determined according to the frequency values at all the directions in the frequency set, the frequency number of the minimum values and the acoustic impedance value.

The invention provides a frequency selective surface inverse design method, device and equipment. The method comprises the steps of obtaining a target square wave; the target square wave is used for representing the expected transmission performance of the frequency selective surface; inputting the target square wave into a pre-trained multi-layer perceptron model to obtain a target design parameter corresponding to the frequency selection surface; the pre-trained multilayer perceptron model is obtained by training based on a preset sample data set; the preset sample data set is an equivalent circuit model established based on a transmission line theory, and is calculated by adopting an equivalent inductive reactance and capacitive reactance empirical formula. According to the method, the equivalent circuit model based on the transmission line theory is used for replacing full-wave simulation, the complex electromagnetic field solving process is avoided, the sample data preparation time is remarkably shortened, due to the fact that the pre-trained multi-layer perceptron model is introduced, the target square waves are directly mapped to the corresponding design parameters, rapid and efficient reverse design is achieved, and the method is suitable for large-scale popularization and application. And the efficiency and the precision of the frequency selective surface design are obviously improved.

The invention discloses a well hole sound wave speed obtaining method and device based on frequency domain analysis, and relates to the field of geophysical acoustic logging, and the method comprises the steps: obtaining an array waveform signal obtained by carrying out full wave train sound wave logging on a target layer section; performing Fourier transform on the array waveform signal to obtain a waveform frequency spectrum signal; extracting a noisy frequency dispersion signal from the waveform frequency spectrum signal, and carrying out noise reduction processing on the noisy frequency dispersion signal to obtain an effective frequency dispersion signal; and performing signal analysis processing on the effective frequency dispersion signal to obtain the well hole sound wave speed. According to the method, real-time acquisition of the stratum sound velocity can be realized while the acoustic logging data is acquired, the accuracy and stability of sound velocity acquisition are improved, the problems that a traditional frequency domain processing method needs manual interaction, the processing efficiency is low and the like are solved, and the problems that a sound velocity processing result is inaccurate and unstable are solved; and the defects of a time domain sound velocity real-time processing method are overcome.

The invention discloses a NiZnCu ferrite composite metasurface with a P wave band broadband and a low RCS (Radar Cross Section) based on 1-bit coding. Firstly, the impedance matching condition of the ferrite is improved through Mn < 2 + > ion doping, so that when the thickness of the NiZnCu ferrite is 2 mm, effective wave absorption with the reflection loss smaller than-10 dB is achieved within the range of 0.25 GHz to 1.0 GHz. Furthermore, NiZnCu ferrite is combined with a sandwich structure (square metal sheet / FR4 / metal back plate, 6 mm) to construct a 1-bit coding metasurface structure unit, optimal array arrangement is obtained by adopting a genetic algorithm, and directional reflection is reduced to the greatest extent. And finally, full-wave simulation software is used for verification, and the result shows that the NiZnCu ferrite composite coding metasurface can further reduce the RCS by using the diffuse reflection effect on the basis of keeping the ferrite wave absorbing effect, the range of the RCS is 0.50 GHz-0. 75 GHz, and the maximum RCS reduction value can reach 29.4 dB.

The invention discloses a three-dimensional full-wave field measurement method based on a single-point laser Doppler vibration meter, and the method achieves the multi-angle and automatic scanning of the surface of a structure through the installation of the single-point laser Doppler vibration meter at the tail end of a multi-degree-of-freedom mechanical arm and the combination of a preset scanning path control program. Under signal excitation, the measurement system obtains vibration response signals in different incident directions, and reconstructs a complete vibration component of the structure in a three-dimensional space in combination with a space vector projection reconstruction algorithm. Compared with a traditional measurement scheme in which three beams of laser are needed and accurate alignment is carried out, the system hardware structure is greatly simplified, the complexity and the operation difficulty of the measurement system are reduced, and the flexibility, the precision and the adaptability of three-dimensional wave field measurement are improved.

The invention discloses a sample screening method and system for an agent model and a microwave device, and the method comprises the steps: sampling and obtaining an initial design point, screening the design point through a fuzzy clustering algorithm, and storing the design point in a database; judging whether the database meets a preset stop condition or not, if yes, outputting the optimal design, and if not, turning to the next step; using the fuzzy clustering algorithm again to simplify the database; thirdly, designing a plurality of design targets, respectively constructing a proxy model for each design target, and optimizing prediction functions obtained by the plurality of proxy models constructed in the third step by using a multi-target optimization algorithm to obtain a target solution set; performing full-wave simulation on the target solution set, judging whether corresponding design points in the target solution set meet design requirements or not, if so, outputting the target solution, and otherwise, turning to the next step; performing candidate design point selection on the target solution in the target solution set by adopting a parallel point adding criterion, performing full-wave simulation, adding a real response value into the database, and returning to the step 2, thereby reducing the design cost of the microwave device.

The present application relates to an assembly mechanism of a full-wave welding head and an ultrasonic welding machine, and relates to the technical field of metal ultrasonic welding; it includes a connecting drive component, a pressure trigger control component and a full-wave welding head, the pressure trigger control component is installed at the output end of the connecting drive component, and the full-wave welding head is installed at the output end of the pressure trigger control component through an assembly mechanism, and the full-wave welding head includes a transmission column and a main welding head; the assembly mechanism includes a connector for connecting the full-wave welding head, and an elastic connector installed on the connector, the elastic connector is sleeved on the end of the transmission column, and the full-wave welding head is provided with an amplitude modulation device and a balance bar on opposite sides thereof. The present application has the effect of improving the assembly accuracy of the full-wave welding head and avoiding the full-wave welding head from warping, breaking, etc. during the welding process as much as possible.

The invention relates to an interconnection line parameter extraction method based on a layered medium Green function improved moment method and a program product, and the method comprises the following steps: setting a sweep frequency parameter and a layered medium structure parameter, constructing a layered medium Green function, and carrying out the calculation to obtain an approximate solution of the layered medium Green function; establishing an electric field integral equation under the layered medium, and performing discretization processing to obtain a corresponding matrix equation; and performing iterative solution on the matrix equation to obtain the overall current distribution of the model, calculating the current value and impedance / admittance value of a port, performing electromagnetic calculation in a frequency sweep mode to obtain different port parameter values, and finally obtaining a parameter-frequency curve to complete the extraction of the port parameters. Compared with the prior art, the stratified medium Green function is fused into the frame of the enhanced electric field integral equation, electromagnetic simulation calculation of the full wave band from 0 frequency to 20 GHz can be achieved, and the method has the advantage of being high in calculation and solving efficiency.

The invention provides a design method and system for a heterogeneous integrated circuit of a microwave system, and relates to the technical field of integrated circuits, and the method comprises the steps: building a multi-layer structure model of the heterogeneous integrated circuit of the microwave system, and the multi-layer structure model comprises a substrate layer, an active device layer, a passive device layer and an interconnection layer; based on the established multilayer structure model, constructing an electromagnetic simulation model of a heterogeneous integrated circuit of the microwave system; performing full-wave electromagnetic simulation on the whole heterogeneous integrated circuit by using a finite element method to obtain an electromagnetic coupling effect and a parasitic effect between devices; based on the optimized electromagnetic simulation model, performing performance evaluation and optimization on the heterogeneous integrated circuit of the microwave system; carrying out large-scale random simulation by utilizing a Monte Carlo method, and evaluating the performance stability of the microwave system under different working conditions; and dynamically adjusting key parameters of the heterogeneous integrated circuit by adopting a self-adaptive algorithm according to a simulation result.

The invention relates to the technical field of switching power supplies, and discloses a gallium nitride charger based on a 494 PWM chip, which comprises a power panel, a rectification circuit module, a half-bridge gallium nitride driving module, a transformer, a 494 chip control module, a totem pole driving module, an isolation driving transformer, a full-wave rectification module, a filter circuit module and a conversion circuit module, the core is that the 494 chip control module generates a PWM signal, and the PWM signal sequentially passes through the totem pole driving module for current amplification and the isolation driving transformer for electrical isolation and signal coupling to drive the two gallium nitride transistors in the half-bridge topology for high-frequency alternate switching. According to the invention, the high-speed switching characteristic of the gallium nitride device is fully exerted, and the charger can work at a higher frequency, thereby reducing the switching loss, reducing the size of a magnetic element, and achieving the high power density and high overall conversion efficiency while improving the power level to a kilowatt level.

The invention discloses a power module near-field radiation characteristic simulation analysis method, and belongs to the technical field of electromagnetic compatibility. According to the method, aiming at the near-field radiation characteristic problem of the power supply module, a power supply module PCB full-wave three-dimensional numerical simulation model is built by using CST, and the near-field radiation characteristics of the power supply module PCB under different output end parameter configurations are obtained through simulation by changing the filter inductance and capacitance values of the output end of the power supply module. And the influence of different PCB grounding layer segmentation modes on the near-field radiation characteristics of the power supply module is analyzed, and a reference basis is provided for subsequent CAN node module PCB optimization.

To provide a controller in which total harmonic distortion (THD) can be improved.SOLUTION: A controller (700) includes: a first external terminal receiving a first voltage (Vmult) with a full-wave rectified waveform; a second external terminal receiving a first detection voltage (Vis), as a negative voltage, generated by a current flowing through a sense resistor (Ris) connected to a ground potential application terminal; an error amplifier circuit (710) generating a second voltage (V2) by amplifying an error between a second detection voltage (Vs) corresponding to an output voltage (Vdc) and a reference voltage (Vref1); an arithmetic circuit (733) generating a third voltage (V4) by multiplying the first and second voltages; an inverting amplifier (734) generating a fourth voltage (V5) by inverting and amplifying the first detection voltage; and a comparator (735) comparing the third voltage and the fourth voltage.SELECTED DRAWING: Figure 11

The present application relates to a power failure detection circuit, the circuit comprises: a rectifying circuit for full-wave rectifying an alternating current voltage so as to obtain a first voltage; a switching circuit for converting the first voltage into a periodic voltage pulse; and a judgment circuit for providing an output signal to a fan control circuit for closing a fan when the periodic voltage pulse is not received within a preset time period, and providing the output signal to a micro-control unit for closing an electronic expansion valve. The present application also relates to a control circuit for a variable refrigerant flow VRF system.

Disclosed in the present application are a resonance suppression method and apparatus, a device, and a storage medium. The method comprises: upon determining, on the basis of the topology and structure of a system circuit, that a circuit having CLC topology is present, determining the inherent resonant frequency point of the circuit having CLC topology; determining that the full-wave effective value of the current of a capacitor in the circuit having CLC topology is greater than a current threshold value; determining that the frequency of the primary subharmonic in the system circuit coincides with the inherent resonant frequency point; and on the basis of the frequency band distribution of the primary subharmonic and the inherent resonant frequency point, determining an optimization scheme for the system circuit, so as to reduce the full-wave effective value of the current of the capacitor in the circuit having CLC topology.

The invention discloses a diffracted wave impedance inversion method based on full wave field information, and the method comprises the steps: carrying out the diffracted wave separation of full wave field original seismic data, and obtaining reflected wave seismic data and diffracted wave seismic data; converting an interval velocity body obtained by processing the full-wave-field original seismic data to obtain an interval velocity low-frequency impedance body; determining a corresponding relation between the full-wave-field original seismic data and the synthetic seismic data in-phase axes, and extracting a comprehensive wavelet; under the constraint of the logging data and the interval velocity low-frequency impedance body, based on the comprehensive wavelet, a post-stack impedance inversion method is adopted to perform inversion on the full-wave-field original seismic data, and a full-wave-field absolute impedance body is obtained; under the constraint of a layer velocity low-frequency impedance body, based on the comprehensive wavelet, a post-stack impedance inversion method is adopted to invert the reflected wave seismic data, and a reflected wave relative impedance body is obtained; and removing the reflected wave relative impedance body from the full wave field absolute impedance body to obtain the diffracted wave absolute impedance body. According to the method, the wave impedance inversion precision of the heterogeneous reservoir can be improved.

The invention provides a composite material damage imaging method and system, and belongs to the technical field of material detection.The composite material damage imaging method comprises the steps that original signals are processed through a frequency domain analysis method, and environmental noise in the signal acquisition process is filtered out; establishing a full wave field data energy curve based on the original signal after the environmental noise in the signal acquisition process is filtered out, and analyzing the attenuation characteristic and the global distribution condition of wave field energy; compensating the original signal based on the attenuation characteristic, obtaining a compensation wave field based on the compensated original signal, and selecting a time window of damage imaging based on the global distribution condition of the energy of the compensation wave field; constructing a damage index based on a wave field gradient, and calculating a wave field damage matrix; and calculating a spatial distribution matrix of damage indexes by adopting an MS effective value based on a time window and a wave field damage matrix of damage imaging, and performing image fusion based on the spatial distribution matrix to create a final damage image. According to the method, the influence of strong incident wave components on damage identifiability is inhibited, and accurate identification of multiple damages is realized.