53 results about "Rayleigh wave" patented technology

The present application relates to geological exploration technical field, disclose a kind of thick loess plateau area coalfield 3D seismic exploration method, comprising the following steps: S101, artificial seismic source shooting record and superficial Rayleigh wave detector data are collected;S102, grid division is carried out to target area, and set to be inverted parameter;S103, vertical ray path time estimation, multilayer medium dispersion forward and poststack energy estimation are carried out;S104, according to first wave arrival time observation value, Rayleigh wave observation dispersion curve, theoretical ray path time, phase velocity and poststack energy generates multi-target error function;S105, target area is divided into three subdomains, differential evolution iteration is carried out, until local convergence;S106, establish a plurality of parallel annealing chain, set chain temperature and gradually decrease by chain, optimize to be inverted parameter, output optimal to be inverted parameter;S107, the static correction time difference and absorption compensation coefficient of each acquisition point are calculated.The present application improves coal seam structure imaging precision and exploration data reliability under complex surface conditions.

The present application relates to the technical field of medical elastic imaging and material multi-scale mechanical measurement, and particularly discloses an elastic imaging method and system based on a scattering displacement gradient field, which comprises the following steps: generating a scattering displacement field by arranging an excitation device around a target material, measuring an out-of-plane displacement gradient field by using transverse shear interference imaging, selecting a single-frame instantaneous gradient field or a frequency-domain gradient field obtained by time-frequency domain Fourier transform as a target field; obtaining a global shear wave velocity distribution by adaptive sliding window interception, two-dimensional autocorrelation calculation and Rayleigh wave spatial autocorrelation theoretical model fitting, and then reconstructing viscoelastic modulus distribution by using an inversion algorithm. The present application supports single-frame scattering displacement gradient field inversion elastic imaging, can be used without high-frame-rate equipment, has strong anti-environmental vibration interference ability and high system stability, is suitable for scenes with poor isolation conditions, has low cost, high efficiency and high measurement precision, and can meet the requirements of medical clinical diagnosis and material multi-scale mechanical measurement.

A high-iron karst geological section comprehensive parameter fine automatic exploration system, including walking wheels, drill bit electrodes, drill bit detectors, drill bit magnetic excitation systems, electrode rotation systems, detector rotation systems, magnetic excitation rotation systems, liquid injection systems, control systems, multi-parameter interpretation systems, power systems, and wireless communication systems; the present application is based on the resistivity method and the wave velocity method, and can be used to explore any depth stratum that can be reached, independent of each other and mutually corroborating to reduce the karst geological multiple solutions, Rayleigh waves and electrical signals can transmit the most suitable signal type and strength according to the geological conditions at the set depth, which can realize the fine and automatic exploration of karst geology and improve the exploration efficiency. The present application also corrects the geological classification method in karst areas, and the corrected method can fully consider the development and particularity of karst, providing a method for the automation of high-iron geological exploration in karst areas and avoiding human errors.

The present application relates to the field of geotechnical engineering and earthquake engineering, in particular to a method for calculating the nonlinear buried super-barrier Rayleigh wave dispersion relation in the foundation. The method comprises: obtaining the structure data of the nonlinear buried super-barrier resonance layer, and obtaining the relative motion equation according to the structure data and the relative displacement; obtaining the total displacement amplitude by analyzing the relative motion equation; obtaining the first motion control equation by using the inner and outer displacement amplitudes; deriving the first displacement component and the first stress component according to the first motion control equation; constructing the second motion control equation, and deriving the second displacement component and the second stress component by using the second motion control equation; and obtaining the dispersion relation curve based on the first displacement component, the first stress component, the second displacement component and the second stress component. The method solves the problems in the prior art, such as the dependence on experience trial and error or large-scale numerical simulation for super-barrier vibration isolation design and low-frequency vibration suppression, and the insufficient prediction accuracy of dispersion characteristics.

The invention provides a Rayleigh wave adaptive filtering method and system for wind wave noise resistance, and the method comprises the steps: extracting the multi-dimensional features of wind wave noise through multi-resolution wavelet packet analysis and empirical mode decomposition, and constructing a feature library; establishing an active and passive signal spectrum correlation model, and quantifying the spectrum overlap ratio; a dual-channel attention filtering network is utilized, dual-channel parallel processing of noise identification and signal reconstruction is carried out, and improved adversarial training is combined, so that accurate separation of signals and noise and effective reservation of overlapped spectrum regions are realized. The system comprises a corresponding multi-channel signal acquisition module, a noise feature extraction module, a deep learning filtering module and a quality evaluation module. According to the method, the three-stage processing flow of feature extraction, correlation modeling and deep learning filtering is adopted, and the data quality and reliability of underwater Rayleigh wave exploration are remarkably improved.

The invention belongs to the technical field of surface wave frequency dispersion inversion, and particularly provides a multi-mode high-precision surface wave frequency dispersion inversion method based on shallow optimization, and the method specifically comprises the steps: 1, building a geophysical model; establishing a geophysical model containing three layers of media; step 2, forward modeling calculation; an improved global matrix method is adopted to solve a Rayleigh wave frequency dispersion equation; step 3, self-adaptive phase velocity searching; the search range is dynamically adjusted to be Vmin-Vmax according to the frequency V; 4, a shallow optimization objective function is constructed; and 5, performing simulated annealing global optimization. According to the method, the shallow layer parameter precision can be remarkably improved, the thickness error of the first layer is reduced from 5-8% to 1-2%, and the speed error of the first layer is reduced from 6-10% to 1-3%; the calculation efficiency is greatly improved, the numerical stability is enhanced, the multi-mode data is fully utilized, and the result display is complete and clear.

The application discloses a low-frequency broadband seismic metamaterial filled with a five-mode dot array core and a design method thereof. The seismic metamaterial is composed of a five-mode dot array core, a concrete hollow pipe and an outermost soil layer. The five-mode dot array core is composed of a plurality of hexagonal crystal system units arranged periodically. The hexagonal crystal system unit is connected by an axial direction and is obtained by space structure conversion. The hexagonal crystal system unit is arranged periodically to form a three-dimensional dot array core structure composed of a plurality of hexagonal crystal system units. The low-frequency broadband seismic metamaterial filled with the five-mode dot array core can form a low-frequency broadband in a target frequency band. The seismic metamaterial is arranged in a vibration isolation area underground. When a seismic Rayleigh wave propagates to the area, the wave energy is significantly weakened under the action of a forbidden band, so that effective isolation and attenuation of the Rayleigh wave can be realized under the condition of a limited space.

The invention belongs to the technical field of data processing and analysis, and particularly relates to a soft soil roadbed-oriented compaction quality real-time prediction and multi-dimensional intelligent evaluation method. The method comprises the following steps: step 1, arranging a plurality of vertical component engineering geophones on the surface of a soil body behind a vibrating wheel of a road roller along the advancing direction to form a geophone array, and connecting all sensors to an edge computing gateway for synchronous acquisition; 2, performing filtering processing on the original seismic waveform record acquired by the detector array; 3, establishing an initial velocity model according to the Rayleigh wave dispersion curve, and outputting a final shear wave velocity model; and 4, according to the final shear wave velocity model, extracting a compaction coefficient estimation value and a compaction uniformity variable coefficient of each depth horizon, and according to a preset determination rule, outputting a compaction quality grade. According to the invention, quality detection can be converted into real-time monitoring in the construction process from traditional postmortem sampling inspection, and compaction quality problems can be found and processed in time.

This application provides a method, apparatus, electronic device, and storage medium for foundation quality testing, belonging to the field of foundation testing technology. The method includes: obtaining standardized sensing data based on foundation dynamic strain data, electromagnetic field response data, and Rayleigh wave propagation data; extracting features from the standardized sensing data to obtain single-mode feature data; determining multi-mode feature fusion weights based on the single-mode feature data; fusing the single-mode feature data with the multi-mode feature fusion weights to obtain multi-mode fused feature data; obtaining target defect identification data based on the multi-mode fused feature data; mapping and updating the foundation digital twin basic model data based on the target defect identification data to obtain foundation digital twin model data with defect attributes; and determining the foundation quality testing results based on the foundation digital twin model data with defect attributes, superstructure load data, and stratum parameter data. This application can meet the high-precision requirements of foundation quality testing.

The invention discloses a wall vibration isolation system suitable for periodic bending of a high and steep roadbed fill slope, which comprises a plurality of vibration isolation structure units arranged according to a period, each vibration isolation structure unit comprises a straight wall (1), an upper covering plate (2), a middle covering plate (3) and a bottom plate (4), and effective control of Rayleigh waves is realized through a specific structure size and arrangement mode; the straight wall (1) is a main body part of the vibration isolation structure unit, is arranged perpendicular to the ground and is used for reflecting a horizontal component of Rayleigh waves; the upper covering plate (2) is of a plate-shaped structure horizontally extending from the top of the straight wall (1) to the vibration source direction and is used for enhancing constraint of a top soil body and a wall body. The middle covering plate (3) is arranged at the middle position of the straight wall (1), horizontally extends towards the direction of a vibration source, is in synergistic effect with the upper covering plate (2), and is used for segmenting the influence range of Rayleigh waves; the bottom plate (4) is arranged at the bottom of the straight wall (1), horizontally extends towards the two sides and is used for restraining displacement of the bottom of the straight wall and promoting conversion from surface waves to body waves.

The invention belongs to the technical field of water conservancy project infrastructure and environment vibration control, and discloses a vibration isolation structure system for the surrounding area environment of a pumped storage power station. The vibration isolation structure system comprises a vibration isolation barrier arranged on the periphery of a target protection building; the vibration isolation barrier comprises a plurality of local resonance units which are annularly arranged at intervals, and the local resonance units are buried underground; the vibration isolation ditch is arranged on the periphery of the target protection building; the outline of the cross section of the vibration isolation trench is narrowed in a stepped manner along with the increase of depth; and the vibration isolation foundation is arranged at the bottom of the target protection building and used for supporting the target protection building. According to the invention, by setting a multi-level cooperative control strategy of near-field isolation-basic vibration isolation-wave resistance barrier, multi-level dissipation and effective obstruction of vibration energy are realized, the vibration isolation effect is remarkably improved, and especially the isolation performance for low-frequency vibration and earth surface Rayleigh waves (R waves) is improved.

The application belongs to the technical field of seismic exploration signal processing, and discloses a method and system for suppressing Rayleigh surface waves based on adaptive frequency modulation characteristic mode decomposition, which comprises the following steps: converting a seismic signal to a frequency space domain by using Fourier transform, and extracting an intrinsic modal component by using an adaptive frequency modulation signal mode decomposition method; screening a modal component containing Rayleigh surface waves according to the characteristics of Rayleigh surface waves in the frequency space domain, and performing adaptive filtering to suppress Rayleigh surface waves in the intrinsic modal component; reconstructing signals of the intrinsic modal component after suppression and the remaining components after screening, and performing Fourier inverse transform, so that an effective signal is finally output, which is the result after Rayleigh surface wave suppression.

The invention discloses a three-dimensional Rayleigh wave attenuation relative variation imaging method taking a stable plot as a reference value, relates to the technical field of Rayleigh wave attenuation relative variation measurement, and aims to solve the problems that in the prior art, a seismic source and a path effect are difficult to effectively strip, and a medium attribute change signal cannot be directly extracted. The invention aims to improve the capability of monitoring the change of the state of the earth crust medium and improve the recognition precision of the earthquake precursor abnormity. Comprising the following steps: respectively calculating Rayleigh wave amplitude ratios of seismic stations in a research area and a reference area to two seismic events; correcting the amplitude ratio of the seismic station in the research area by using the amplitude ratio of the seismic station in the reference area, and calculating to obtain the relative variation of the Rayleigh wave attenuation coefficient of the medium of the station in the research area between the two seismic events; on the basis of relative variation of attenuation coefficients calculated by multiple stations and multiple frequencies, spatial interpolation is performed on each single-frequency data to generate a two-dimensional plane distribution diagram, and then different-frequency two-dimensional diagrams are combined according to corresponding depths to generate a three-dimensional space distribution image.

The invention discloses a non-stop production foundation reinforcement method and system for an in-service industrial factory building. The method comprises the steps that a settlement source is analyzed based on Rayleigh wave test data, and a combination scheme is generated; a micro drilling machine is used for implementing minimally invasive targeted grouting, the principle of first outside and then inside is followed, and an acoustic interface formed by a peripheral grouting body and a reflected wave energy threshold value are used for judging an internal grouting boundary; high-pressure jet grouting operation is carried out, the formed pile body wraps the tail end of the grouting reserved steel pipe, and a composite bearing structure with the upper steel pipe reinforced and the lower pile body anchored is constructed; construction parameters are dynamically adjusted in the whole process according to settlement monitoring data. Quantitative control over the hidden grouting range is achieved through acoustic physical characteristics, the problem of discontinuous deep and shallow layer stress transfer is solved through physical connection of the steel pipe and the pile body, and the method is suitable for low-disturbance non-stop-production reinforcement in a narrow space.

The invention belongs to the technical field of exploration geophysics and seismic signal processing, and relates to a Rayleigh wave double-component fusion method and system based on model prediction. In order to solve the problem that a fusion decision depends on an empirical threshold and cannot quantitatively predict an effect, the method comprises the following steps: acquiring seismic data continuously acquired by a station pair in a target area; calculating the signal-to-noise ratio of the ZZ cross-correlation function and the signal-to-noise ratio of the RR cross-correlation function of each station pair; calculating the ratio of the signal-to-noise ratio of the RR cross-correlation function to the signal-to-noise ratio of the ZZ cross-correlation function of each station pair; calculating a similarity index according to the ratio; predicting a fusion gain by adopting a similarity index; and according to a comparison result of the prediction gain and a target threshold value, intelligently deciding whether to carry out double-component fusion, and outputting a final effective signal. According to the method, the fusion decision is improved from experience judgment to a computable and optimizable model driving process, the overall signal-to-noise ratio of the data can be stably and reliably improved, and the seismic data quality for imaging is directly improved.

The application belongs to the technical field of seismic wave forward simulation, and discloses a two-dimensional three-component surface wave simulation method and system based on a finite difference method. The method is based on the discrete processing of continuous medium by the rotated staggered grid finite difference method, and realizes the free surface condition based on the discrete processing strategy; the M-PML is used to process the other absorbing boundary except the free surface in the solving area; the two-dimensional three-component surface wave simulation is carried out through the source loading, and the x, y, z direction seismic wave field containing Rayleigh wave and Love wave is obtained. The application realizes the high-precision two-dimensional three-component surface wave field forward simulation, and realizes the simulation of body wave and surface wave field at the same time, which makes a contribution to the promotion of two-dimensional full wave field forward simulation research, and is beneficial to the promotion of the research on the law of seismic wave propagation.

The application discloses a kind of based on non-paraxial approximate multivariate Gaussian sound beam model ultrasonic phased array Rayleigh wave field calculation method, the method first solves single array element Rayleigh wave field by establishing non-paraxial approximate multivariate Gaussian sound beam model, then determines phased array transducer parameter to calculate phased array each array element coordinate and the delay required for phased array Rayleigh wave deflection and focusing each array element, finally to single array element Rayleigh wave field is delayed and is added to obtain phased array Rayleigh wave synthesis sound field.The method realizes the fast calculation of phased array Rayleigh wave field under the premise of guaranteeing accuracy, solves the problems, such as low efficiency of traditional Rayleigh wave field calculation method, deviation increases with off-axis distance, etc., has guiding significance to the optimization of ultrasonic testing process and the quantitative evaluation of defect.

The invention discloses a seismic service system for micro-motion exploration and a data processing method, and relates to the technical field of geophysical exploration, and the system comprises the steps: deploying a distributed sensor array, and achieving the high-precision time synchronization through a self-organizing wireless network; continuously collecting environment vibration data and preprocessing the environment vibration data; calculating a cross-correlation function based on a phase weighted stacking algorithm to extract an empirical Green function; acquiring a high-precision Rayleigh wave phase velocity frequency dispersion curve by adopting a time-frequency domain phase matching pursuit technology; constructing a three-dimensional shear wave velocity model by combining a Markov chain Monte Carlo inversion algorithm of Bayesian reasoning, and introducing transverse constraint and prior geological information; and establishing a quality feedback control mechanism to optimize acquisition and processing parameters. According to the method, the stability of micro-motion signal processing and the resolution of underground structure imaging in a low signal-to-noise ratio environment are remarkably improved, full-process automation is realized by relying on a cloud service platform, and a single exploration processing period is shortened to be within 48 hours.

The invention belongs to the field of seismic data processing, and relates to a Rayleigh wave double-component fusion method capable of prolonging an effective frequency dispersion curve. Comprising the following steps: acquiring continuous three-component background noise data of stations in a target area; calculating ZZ cross-correlation functions of all station pairs; calculating RR cross-correlation functions of all station pairs; calculating the signal-to-noise ratio of the ZZ cross-correlation function and the signal-to-noise ratio of the RR cross-correlation function of each station pair; screening station pairs; calculating the ratio of the signal-to-noise ratio of each screened station to the ZZ cross-correlation function to the signal-to-noise ratio of the RR cross-correlation function; if the specific value in the station pair meets a similar condition, superposing the ZZ cross-correlation function and the RR cross-correlation function of the station pair as a final effective signal; or the cross-correlation function with the large signal-to-noise ratio is selected as the final effective signal, the signal-to-noise ratio of the fused signal is improved through safe fusion, and therefore the data which are originally obsolete can be effectively reused.

This invention discloses a method, apparatus, and medium for cross-dimensional Bayesian inversion of Rayleigh surface wave dispersion curves, relating to the field of surface wave exploration technology. This invention introduces a Dix-type physically guided soft prior, using a reference shear wave velocity profile as a probability anchor point to construct a Gaussian probability field around this profile. This guides the cross-dimensional Bayesian inversion to quickly enter a high-probability physically reasonable region in a probabilistic sense, thereby upgrading the Dix non-iterative inversion results from "fixed initial values / hard constraints" to "Gaussian probability anchor point soft priors." Simultaneously, based on the formation depth value corresponding to the subsurface shear wave velocity parameters to be inverted, a depth-related prior standard deviation of the Gaussian probability field is set to ensure the soft prior operates within the physical boundaries. This makes the final inversion results naturally biased towards the physically reasonable model region in a probabilistic sense, and physical boundary constraints are applied, eliminating systematic biases in the Dix inversion and ultimately obtaining inversion results consistent with actual geology.

The invention discloses a portable long-distance laser ultrasonic surface wave velocity accurate measurement system and method. The system comprises a small pulse laser, a long-distance laser grating lens, a computer, a signal acquisition card, a photoelectric detector, a laser ultrasonic measurement interferometer, an optical fiber coupling lens of the laser ultrasonic measurement interferometer and a tripod. High-energy pulse laser beams emitted by the small pulse laser device form two laser beams which are crossed at a certain angle after being subjected to long-distance laser on the grating lens, the two laser beams are irradiated on the surface of a measured object to interfere and generate grid-shaped light spots with a fixed period, and the measured object generates periodic thermal elastic force under the irradiation of the grid-shaped light spots. Under the action of the periodic thermal elastic force, ultrasonic Rayleigh waves with the wavelength of 55nm are excited on the near surface of the measured object, and the ultrasonic Rayleigh waves are received by the laser ultrasonic measurement interferometer in the process of spreading along the surface. And performing Fourier transform on the received signal to obtain the center frequency f of the received signal, and accurately obtaining the propagation velocity of the laser ultrasonic surface wave at the measured position according to a formula c = f *.

The invention relates to the technical field of structure health monitoring, in particular to a structure surface defect depth monitoring device and a preparation and monitoring method thereof.The structure surface defect depth monitoring device comprises a plurality of combined units of Rayleigh wave emitters and Rayleigh wave receiver arrays, and the Rayleigh wave emitters and the Rayleigh wave receiver arrays are prepared or adhered to the surface of a to-be-detected structure in situ; the Rayleigh wave receiver array is located between the Rayleigh wave emitter and the surface defect, and the Rayleigh wave emitter comprises a first direct-writing type lead-free piezoelectric ceramic layer and an interdigital electrode located on the first direct-writing type lead-free piezoelectric ceramic layer. The Rayleigh wave receiver array comprises a second direct-writing type lead-free piezoelectric ceramic layer and a comb-shaped electrode located on the second direct-writing type lead-free piezoelectric ceramic layer. According to the invention, accurate, reliable and low-cost detection and monitoring of the depth of the surface defect of the curved surface structure are realized without manual scanning and optical sight.

This invention relates to the field of mining blasting and tunneling technology, and discloses a tunnel blasting and tunneling method based on the super-shear fracturing of layered hard rock structural surfaces. The blasting method first induces super-shear fracturing of the hard rock structural surfaces through blasting. The generated Mach cone high-frequency shock wave and Rayleigh wave jointly promote the generation of shear and tensile cracks on both sides and the surface of the structural surfaces. Then, a fractured cavity is formed by delayed blasting through deep and shallow holes. The tunneling method utilizes the fractured cavity formed by blasting and the surrounding cracks. The cutting head of the roadheader penetrates into the cavity and laterally spins and breaks the rock, which is beneficial to the breaking of hard rock. This invention forms a highly efficient and coordinated rock breaking system of "blasting-machinery" for layered hard rock tunnels, which solves the problems of low rock breaking efficiency, large cutting tooth wear, unreasonable explosive dosage, and insufficient free surface in traditional hard rock tunneling.

The application relates to the field of building earthquake resistance, and particularly relates to a steel trunk-branch bionic ultralow-frequency earthquake hypersurface. The steel trunk-branch bionic ultralow-frequency earthquake hypersurface comprises a tree-shaped resonator, a plurality of resonators enclosing a protected object in the center, the tree-shaped resonator comprises a steel trunk and steel branches, the steel trunk is vertically fixed on the surface of the ground, the steel branches comprise a plurality of stages of steel branches, wherein a steel first-order branch is fixedly connected with the top of the steel trunk, and the top of the steel branch is fixedly connected with the bottom of the lower-order steel branch in sequence. The steel trunk-branch bionic ultralow-frequency earthquake hypersurface is fixed on the ground around the protected object, when surface waves reach the array, a Rayleigh wave and other surface wave components are converted into deep body waves through wave mode conversion, and the structure earthquake resistance is realized.

Provided is an elastic wave device in which response caused by Rayleigh waves is suppressed. An elastic wave device (1) includes: an IDT electrode (5) provided on a piezoelectric substrate; and reflector electrodes (6, 7) disposed on both sides of the elastic wave propagation direction of the IDT electrode (5) and having a plurality of electrode fingers (6a or 7a) disposed at intervals, and further includes: dielectric films (10, 11) disposed between the reflector electrodes (6, 7) and the piezoelectric substrate in regions in which the plurality of electrode fingers (6a, 7a) of the reflector electrodes (6, 7) and the intervals are provided.

The invention relates to a micro-motion frequency dispersion curve inversion method and device, electronic equipment and a storage medium. The micro-motion frequency dispersion curve inversion method comprises the following steps: acquiring micro-motion waveform data and an actually measured frequency dispersion curve under different frequencies; frequency dispersion curve extraction is carried out on the micro-motion waveform data through a high-resolution frequency-wave number method, an initial Rayleigh wave frequency dispersion curve is obtained, and an inversion model is constructed according to the initial Rayleigh wave frequency dispersion curve; performing recursive calculation and forward calculation on the initial Rayleigh wave frequency dispersion curve to obtain a recursive theoretical curve; correcting the initial Rayleigh wave frequency dispersion curve according to a difference value between the recursive theory curve and the actually measured frequency dispersion curve to obtain a target Rayleigh wave frequency dispersion curve; performing iterative screening on the target Rayleigh wave frequency dispersion curve according to the inversion model to obtain an inversion result; the technical defects that a traditional method depends on the quality of a frequency dispersion curve and is prone to falling into a local optimal solution are effectively overcome by constructing an inversion model in combination with a recursive correction and iterative screening mechanism, and the method has the advantages of improving the inversion precision, avoiding the local optimal solution and improving the calculation efficiency.

This invention relates to the field of biosensors and microfluidics, and particularly to a method for treating interfering DNA based on an ultrasonic-driven device. The method includes an ultrasonic-driven device comprising a piezoelectric substrate, Rayleigh wave drive, microfluidic reaction, and drive control module. First, a nucleic acid hybridization system is constructed to achieve initial binding and recognition of interfering DNA. Then, Rayleigh waves are excited to generate physical shearing force. Based on the difference in binding force between the interfering DNA and the target DNA and probe, precise mechanical feature recognition is achieved. By adjusting the radio frequency signal parameters to make the shearing force between the two types of binding forces, the interfering DNA is dissociated and expelled, completing the selective removal process.

This invention relates to a device and method for detecting dental microcracks based on Rayleigh wave transmission attenuation and nonlinear response, belonging to the fields of biomedical engineering and nondestructive testing technology. The device includes a flexible dental crown detection device composed of two sets of flexible semi-circular probe assemblies. An ultrasonic transceiver array is embedded in the inner wall of each set of flexible semi-circular probe assemblies. The ultrasonic transceiver array is composed of several micro piezoelectric transducer elements arranged circumferentially. The front end face of the micro piezoelectric transducer elements faces the enamel surface, and the opposite end face is provided with an air backing layer, which can adaptively conform to the complex curved surface of the tooth and realize early qualitative identification and quantitative assessment of the depth of microcracks.

The present application belongs to the technical field of surface wave dispersion inversion, and particularly provides a multi-mode high-precision surface wave dispersion inversion method based on shallow layer optimization, and the specific steps comprise: step one, establishing a geophysical model; a geophysical model containing three layers of medium is established; step two, forward calculation; an improved global matrix method is used to solve Rayleigh wave dispersion equation; step three, adaptive phase velocity search; according to frequency V, the search range is dynamically adjusted to V min ~ V max : step four, constructing a shallow layer optimization objective function; step five, simulated annealing global optimization. The present application can significantly improve the accuracy of shallow layer parameters, reduce the first layer thickness error from 5-8% to 1-2%, and reduce the first layer velocity error from 6-10% to 1-3%; the calculation efficiency is greatly improved, the numerical stability is enhanced, the multi-mode data is fully utilized, and the result is complete and clear.