221 results about "Acoustic reflection" patented technology

The invention discloses a method and a system for estimating the pile length of an engineering pile. The method comprises the following steps: acquiring a multi-source detection signal reflecting the striking response of a pile hammer and stratum prior information; on the basis of stratum prior information, carrying out physically-driven adaptive analysis on sound wave components in the multi-source detection signals, and extracting preliminary sound wave reflection features; performing correlation verification on the preliminary sound wave reflection characteristics by using vibration components in the multi-source detection signals to generate corrected reflection characteristics; and the signal quality of the corrected reflection characteristics is evaluated, an intelligent hammering control instruction is generated according to the signal quality so as to execute closed-loop enhanced signal excitation, finally, multi-modal information before and after enhancement is fused, and a final pile length estimated value is obtained through calculation. Through sound and vibration coupling verification and intelligent active excitation, the accuracy, reliability and detection depth of pile length estimation under the conditions of strong noise, complex stratum and large depth are improved.

The invention belongs to the technical field of acoustic devices and ultrasound, and discloses an ultrasonic transducer, a multi-layer gradient acoustic impedance matching layer and a preparation method of the multi-layer gradient acoustic impedance matching layer, and the multi-layer gradient acoustic impedance matching layer comprises a plurality of acoustic impedance layers which are arranged in sequence and have different acoustic impedances; in the direction from the first acoustic impedance layer to the last acoustic impedance layer, the acoustic impedance of the acoustic impedance layer is in a decreasing trend; the surface of the previous acoustic impedance layer is provided with a micro-columnar structure, the micro-columnar structure extends into the next acoustic impedance layer, a mechanical interlocking interface is formed between the previous acoustic impedance layer and the next acoustic impedance layer through the micro-columnar structure, and the micro-columnar structure is gradually thinned from the bottom to the tip. According to the invention, the gradient impedance design of the acoustic impedance layers significantly reduces the acoustic reflection between the acoustic impedance layers, improves the acoustic energy transmission efficiency, and widens the working bandwidth of the ultrasonic device; the micro-columnar structure not only maintains the stability of interlayer adhesion in a high vibration or thermal stress environment, but also further smooths gradient transition and reduces interface reflection.

The invention relates to the technical field of bridge engineering structure health monitoring, in particular to a service life prediction method and system for a bridge connection part, and the method comprises the steps: collecting the strain of a grouting sleeve, a reinforcement-grouting interface ultrasonic reflection signal and environment temperature and humidity data through a distributed sensor array; a three-dimensional dynamic void rate model is generated through fusion of a spatial topological mapping algorithm, a correlation function of load circulation and void expansion is established, the dynamic void rate is input into a bond strength coupling degradation model, after strength attenuation is quantized in combination with steel bar corrosion data and bond failure early warning is triggered, stress redistribution is calculated through multi-physics coupling simulation, and the dynamic void rate is obtained. Early warning is taken as a starting node, the actual load spectrum and temperature and humidity data are combined, Monte Carlo sampling is adopted to simulate rigidity degradation and output the residual life probability, the system comprises a multi-source collaborative sensing unit, a micro-void evolution analysis unit and a life prediction decision unit, and the safety control precision of bridge connection parts is improved.

Aspects of this disclosure relate to a bulk acoustic wave resonator and an integrated capacitor. In certain embodiments, the integrated capacitor can be a metal-insulator-metal capacitor in parallel with the bulk acoustic wave resonator. The metal-insulator-metal capacitor can include a portion of a first electrode and a portion of a second electrode of the bulk acoustic wave resonator. At least part of the metal-insulator-metal capacitor is positioned laterally relative to an acoustic reflector of the bulk acoustic wave resonator. Other embodiments of capacitors integrated with a bulk acoustic wave resonator are disclosed. Related filters, multiplexers, radio frequency modules, radio frequency systems, wireless communication devices, and methods are disclosed.

An acoustic wave device includes a piezoelectric layer including first and second major surfaces, an IDT electrode on one of the first and second major surfaces, and including electrode fingers arranged in an arrangement direction, and a support facing the second major surface, and including an acoustic reflection portion facing the second major surface. The electrode fingers include a first electrode finger at an outermost position in the arrangement direction and a second electrode finger adjacent thereto. A product of a width, height, and density of one of the first and second electrode fingers is greater than a product of a width, height, and density of a central electrode finger. When the thickness of the piezoelectric layer is denoted by d and a center-to-center distance between adjacent electrode fingers is denoted by p, d / p is less than or equal to about 0.5.

The invention discloses a Pelteobagrus vachelli population dynamic monitoring system and method, particularly relates to the technical field of fishery resource monitoring, and aims to solve the problems of inaccurate juvenile fish survival rate evaluation and poor monitoring timeliness in a benthic hidden environment in the prior art. The method comprises the following steps: arranging a benthic penetration type sonar array to synchronously collect a water body reflection signal and a benthic environment sample, and extracting juvenile fish specific gene fragments by combining an environment DNA (Deoxyribose Nucleic Acid) enrichment technology to generate concentration distribution data; screening juvenile fish distribution data by using an acoustic reflection signal and body length correlation model, and positioning an active hot spot area through space-time overlapping analysis; deploying a directional sound wave excitation device to obtain escape trajectory data, and calculating a survival rate in combination with a density attenuation model; finally, multi-source data and topographic features are fused to generate a real-time population dynamic monitoring result, and high-precision and non-intrusive monitoring of the juvenile fish population in the hidden environment is realized.

The invention is suitable for the field of intelligent jet cleaning, and provides a dirt recognition cleaning method, device and equipment, and the dirt recognition cleaning method comprises the steps: obtaining an original image corresponding to target dirt and a sound reflection signal corresponding to the target dirt; converting the sound reflection signal corresponding to the target dirt into an image representation; obtaining a fused image corresponding to the target dirt according to the original image corresponding to the target dirt, the image representation and a preset multi-channel image fusion algorithm; inputting a fusion image corresponding to the target dirt into the improved deep neural network to obtain segmentation mask data and size data of the target dirt; adjusting the pose of the dirt cleaning equipment according to the segmentation mask data and a preset coordinate conversion algorithm; according to the size data of the target dirt, dirt cleaning parameters are adjusted, and dirt cleaning equipment is controlled to execute cleaning operation. According to the method, the dirt recognition and cleaning precision and efficiency are remarkably improved, and various cleaning requirements and operation environments can be better met.

The technology relates to acoustic reflectometry systems and methods. An example system includes an acoustic sensor that includes a generator that emits acoustic pulses; and a sensor that detects the emitted acoustic pulses and reflections thereof. The system further includes a monitor, in communication with the acoustic sensor. The monitor performs operations including: receive patient data for a current patient receiving ventilation; provide the patient data as input to a trained clinical model; receive, as output from the trained clinical model, a clinically relevant threshold for an acoustically measurable parameter; process the detected incident and reflected waves to determine a value of the acoustically measurable parameter; compare the value of the acoustically measurable parameter to the clinically relevant threshold; and based on the comparison, generate a notification.

The invention discloses an HDI plate manufacturing process for a pen electronic camera module, and the process comprises the steps: carrying out the multi-frequency acoustic wave penetration and temperature gradient processing of a substrate, and obtaining the pre-detection data of the substrate; in the laser drilling process, short-pulse multi-frequency acoustic waves and local heat regulation are applied to a target hole area, and micropore acoustic reflection data are obtained; the method comprises the following steps: independently regulating and controlling the temperature of a plurality of areas of a board surface before chemical copper deposition treatment, and recording acoustic scanning data to form a regional acoustic characteristic spectrum; performing acoustic wave excitation according to a preset time interval in the chemical copper deposition process to obtain monitoring data of the copper deposition process; periodic thermal excitation and fluid disturbance are applied in the electroplating process, and electroplating dynamic monitoring data are obtained; after electroplating is completed, temperature circulation and stress excitation treatment are carried out, and the evaluation result of the internal structure of the micro-through hole is obtained. According to the technical scheme, the micro-through-hole structure with the bubble micro-migration tendency can be accurately identified and screened in the manufacturing process, and the long-term reliability and the use stability of the HDI plate are effectively improved.

A system that performs wall direction estimation to determine a position of an acoustically reflective surface relative to a device. For example, the device may detect a direct sound received from an active sound source and a first reflection reflected from a nearby wall. Based on a time delay, the device can estimate a direction and / or distance to the wall. For example, the device determines a time differential of arrival (TDOA) between the direct sound and the first reflection for each microphone in a microphone array. The device combines TDOA values of the entire microphone array into a distance vector, which the device can compare to reference distance data to determine the best wall direction estimate. For example, reference distance values are fixed based on a geometry of the microphone array and the device can identify an azimuth value that is most similar to the distance vector.

The invention relates to the technical field of signal processing, in particular to an ultrasonic reflected wave signal processing operation method, a chip and a storage medium, and the method comprises the steps: amplifying a collected ultrasonic reflected wave signal through a multi-stage series programmable gain amplifier, the amplified reflected wave signals are respectively distributed to a threshold comparator and an analog-to-digital converter; determining a target gain of the multi-stage series programmable gain amplifier; acquiring an attenuation coefficient of reflected wave signal propagation; obtaining a threshold control coefficient of current reflected wave signal acquisition; determining a trigger threshold value of the analog-to-digital converter for reflected wave signal acquisition; aiming at the transmitted single ultrasonic signal, acquiring each group of reflected wave signal sequences acquired under the condition that an analog-to-digital converter meets a trigger threshold value; and based on the distribution of all groups of reflected wave signal sequences, determining the real reflected wave of the single ultrasonic signal and the zero crossing point time corresponding to the real reflected wave. Therefore, the precision of ultrasonic reflected wave signal processing is improved.

The invention relates to the technical field of bridge disease detection, in particular to a bridge underwater disease detection system and method based on array imaging, and the system is characterized in that in a disease detection registration module, "sonar-laser-polarization" three-mode independent calculation and double-reference constraint are carried out; by combining the layered coaxial integrated design of a mark point, namely an acoustic reflection unit and an optical diffuse reflection unit, high-precision initial registration of sonar coordinate calculation errors, laser ranging correction errors and polarization three-dimensional conversion errors is realized, and the problem of multi-modal data scale drift is solved; the bridge pier path scanning module realizes complete coverage of bridge pier curved surface disease detection through scenarized adaptation of a spiral-radial swing track and a variable pitch spiral track aiming at the contradiction between the fixed curvature of a detection ring and the dynamic change of the curvature of a bridge pier, and effectively solves the problem of mismatching of a coverage gap and a posture of a traditional fixed path.

An acoustic wave device includes acoustic elements sharing a support, and a piezoelectric film on the support and including a piezoelectric layer that includes a piezoelectric body. The acoustic elements include a first acoustic element that is an acoustic coupling filter, and a second acoustic element electrically connected to the first acoustic element. In plan view, an acoustic reflection portion is provided in the support overlapping with first electrode fingers, second electrode fingers, and third electrode fingers of the first acoustic element and a functional electrode of the second acoustic element.

An acoustic wave device includes a piezoelectric layer with first and second major surfaces, an IDT electrode on at least one of the first and second major surfaces and including electrode fingers arranged in a predetermined direction, a support facing the second major surface and including an acoustic reflection portion on the second major surface side, and a load film in a region that, in plan view in a first direction, overlaps at least one end portion of the IDT electrode in the arrangement direction. The end portion includes a first electrode finger positioned outermost in the arrangement direction, and d / p is about 0.5 or less where d is a thickness of the piezoelectric layer and p is a center-to-center distance between adjacent ones of the electrode fingers.

The invention relates to the technical field of abnormal behavior recognition, in particular to an abnormal behavior multi-mode recognition method and system for a smart community. Comprising the following steps: multi-modal data acquisition and preprocessing: synchronously acquiring spatio-temporal dynamic data of a target area through a millimeter wave radar, an infrared sensor, a microphone array and a panoramic camera deployed in a community, wherein the spatio-temporal dynamic data comprises a human body motion track, temperature field distribution, environment voiceprint characteristics and a visual image sequence; wherein the millimeter-wave radar adopts a frequency modulation continuous wave system to sample micro-Doppler characteristics of a human body, the infrared sensor realizes temperature field reconstruction through the pyroelectric array, the microphone array collects voiceprint signals through the array structure, and the panoramic camera collects a high-frame-rate image sequence; and environment interference coupling correction: aiming at acoustic reflection characteristics of different materials in the community, and combining an illumination abrupt change rate, an object reflectivity and an air humidity parameter, the method can improve the recognition accuracy and robustness in a complex community environment.

An acoustic wave device has a substrate, an optional functional layer disposed over at least a portion of the substrate, a piezoelectric layer disposed over at least a portion of the functional layer and / or substrate, and an interdigital transducer electrode disposed on the piezoelectric layer. The piezoelectric layer has an outer edge spaced inward of an outer edge of the substrate, the outer edge of the piezoelectric layer being tapered at an angle relative to a surface of the substrate to thereby reduce an acoustic reflection magnitude at said outer edge of the piezoelectric layer.

An acoustic resonator is provided that includes a piezoelectric layer, an interdigital transducer (IDT) including a plurality of interleaved fingers on the piezoelectric layer, a substrate, and an acoustic reflector between the piezoelectric layer and the substrate. The acoustic reflector that is on the piezoelectric layer includes alternating first layers of first materials and second layers of second materials. A first acoustic impedance of the first materials is different from a second acoustic impedance of the second materials. A ratio of a pitch of the IDT over a thickness of the piezoelectric layer is less than 10. A first thickness of at least one of the first layers is larger than a quarter of a first wavelength λ1. λ1 is an acoustic wavelength of a shear bulk wave in the at least one of the first layers at a resonance frequency of the transversely-excited bulk acoustic resonator.

The invention relates to the technical field of bulk acoustic wave resonators, and particularly provides a temperature compensation type bulk acoustic wave resonator, a preparation method thereof and a duplexer, the temperature compensation type bulk acoustic wave resonator comprises a substrate, a bottom electrode, a piezoelectric layer, a top electrode and a temperature compensation layer which are sequentially connected from bottom to top, the substrate is provided with an acoustic reflector, and the temperature compensation layer is provided with a dielectric layer. The temperature drift coefficient of the temperature compensation layer is smaller than that of the piezoelectric layer, the temperature compensation layer comprises a first compensation part, and the boundary of the projection of the first compensation part in the overlook direction is located in the boundary of the projection of the acoustic reflector in the overlook direction; the temperature compensation type bulk acoustic wave resonator can effectively solve the problem that the resonant frequency of the bulk acoustic wave resonator is easily influenced by the temperature change due to the fact that the material characteristic of the piezoelectric layer shifts along with the temperature change.

The invention discloses an urban road dynamic noise traceability evaluation method and system based on digital twinning, and the method comprises the steps: cooperatively collecting noise and road vibration signals through a non-uniform sound pressure sensor array and a vibration sensor, and dynamically compensating sound wave attenuation in combination with environment parameters; voiceprint features are extracted through wavelet packet decomposition, and dynamic parameters such as digital twinborn associated traffic flow and architectural acoustic reflection are constructed; improving a time difference positioning algorithm and fusing vibration spectrum verification to suppress environmental reflection noise; in the digital twin model, sound field distribution is predicted through sound ray tracking, health risks are evaluated based on a frequency band weighting model, and a parameterized sound insulation screen design and traffic flow regulation and control strategy is generated. The system integrates a multi-source sensing module, a digital twin engine module and an anti-interference positioning and decision optimization module, and realizes full-flow intelligentization of noise signal acquisition, feature fusion modeling, anti-interference positioning and treatment scheme generation.

The invention discloses a distribution network electric leakage detection method comprising the following steps: obtaining multi-dimensional data of a transformer area, and carrying out data preprocessing and multi-dimensional data linkage analysis to obtain a suspected leakage transformer area; performing ground wire coupling characteristic signal injection on the suspected leakage transformer area, and judging whether electric leakage occurs in the transformer area or not according to signal coupling response; performing characteristic signal injection test on each branch line of the transformer area with electric leakage, and determining an electric leakage branch line; the unmanned aerial vehicle carries out aerial inspection on the electric leakage branch line and collects infrared thermal image data, ultrasonic reflection data and aerial photography visual data of the line; identifying an abnormal position on the line as a candidate electric leakage point; and implementing a mobile electric leakage signal intensity test in the line section corresponding to the candidate electric leakage point, and determining a final electric leakage point according to the front and rear sudden change positions of the electric leakage signal intensity. Real-time or high-frequency electric leakage detection can be carried out, and the position of an electric leakage fault can be found in time.

The invention discloses a defect positioning method, system and device based on vehicle-mounted fusion detection and a medium, and belongs to the technical field of distribution line fault detection. The method comprises the steps that a coordinate system is established according to the environment of a detected vehicle; the method comprises the following steps: collecting detection data through a vehicle-mounted probe, and preprocessing the detection data; when the vehicle is detected to be in a denial environment, optimizing the preprocessed detection data by constructing an acoustic reflection path model and a dynamic mask, and extracting infrared partial discharge features and acoustic imaging features; judging the discharge condition of the distribution line by using an acoustic infrared registration fusion mechanism; the infrared partial discharge features and the acoustic imaging features are fused, a fusion detection result is obtained, and a defect part is judged in combination with a line equipment drawing or a three-dimensional model; and combining the defect part with the coordinate system to obtain a defect coordinate, and rechecking the defect part by using the detection equipment according to the defect coordinate. According to the invention, the problem that accurate fault detection and fault positioning of the fault part of the distribution line cannot be realized in the prior art is solved.

The present disclosure relates to a system and method for use of acoustic reflectometry information in ventilation devices. The system and method includes a speaker to emit sound waves into an intubated endotracheal tube (“ETT”) and a microphone to detect returning acoustic reflections. In addition, the system and method includes a reflectometry device in communication with a ventilation device for analyzing timings and amplitudes of the returning acoustic reflections to determine a size of a passageway around an ETT tip, location and size of ETT obstructions, and relative movement of the ETT tip within a trachea. The reflectometry device is also configured to determine a resistance parameter representative of resistance to actual flow of air through the ETT based upon a function of the diameter of the ETT, length of the ETT, and percent obstruction of the ETT, where the resistance parameter is used to calculate the tracheal pressure.

An audio apparatus for generating a flutter echo audio signal comprises a receiver (401) arranged to receive room metadata indicative of properties of a room. The room metadata may e.g. indicate dimensions of the room and / or acoustic reflection data for boundaries of the room. An estimator (405) determines a flutter echo estimate for the room in response to the room metadata where the flutter echo estimate is indicative of a level of a flutter echo in the room. A signal generator (403) includes a feedback delay network comprising a plurality of feedback loops. The signal generator (403) is arranged to generate the flutter echo audio signal from output signals of a set of feedback loops of the plurality of feedback loops being fed an audio source signal. An adapter (407) adapts a first parameter for a first feedback loop of the set of feedback loops in response to the flutter echo estimate.

An acoustic wave device includes a piezoelectric layer including first and second main surfaces facing in a first direction, an IDT electrode on at least one of the first or second main surface and including electrode fingers arranged in an arrangement direction, a support facing the second main surface and including an acoustic reflection portion, and a protective film on at least one of the first or second main surface. In a region that overlaps, in plan view in the first direction, a first of the electrode fingers outermost in the arrangement direction, the protective film includes a surface of a first step where a side surface of the protective film is exposed in a direction intersecting an extending direction of the first electrode finger. When d is a thickness of the piezoelectric layer and p is a center-to-center distance between adjacent electrode fingers, d / p is about 0.5 or less.

An acoustic wave device includes a piezoelectric layer including first and second main surfaces, an IDT electrode on one of the first and second main surfaces, and including electrode fingers, a support facing the second main surface, and including an acoustic reflection portion at a portion closer to the second main surface of the piezoelectric layer, and a load film extending over a region that overlaps, when viewed in plan in the first direction, at least electrode fingers from a fourth one of the electrode fingers from a first outer end in an arrangement direction to a fourth one of the electrode fingers from a second outer end in the arrangement direction. d / p is less than or equal to about 0.5 where d denotes a thickness of the piezoelectric layer, and p denotes a center-to-center distance between adjacent two of the electrode fingers.

Provided is an elastic wave device that makes it possible to suppress unnecessary waves.　The elastic wave device 1 comprises: a support member; a piezoelectric film that is provided on the support member, and includes a piezoelectric layer 6; and an IDT electrode 7 that is provided on the piezoelectric film, and has a plurality of electrode fingers (a plurality of first and second electrode fingers 18 and 19). In a plan view, an acoustic reflection portion is formed at a position of the support member overlapping the IDT electrode 7. When a direction that is orthogonal to the direction in which the plurality of electrode fingers extend is defined as an electrode finger orthogonal direction, a plurality of electrode finger formation regions E1 and E2 that include two or more electrode fingers are constituted in the portion where the IDT electrode 7 is formed. The plurality of electrode finger formation regions E1 and E2 are arranged in the electrode finger orthogonal direction. Each electrode finger formation region E1 and E2 spans from the center in the electrode finger orthogonal direction of the electrode finger at one end in the electrode finger orthogonal direction among two or more electrode fingers to the center in the electrode finger orthogonal direction of the electrode finger at the other end. When the center-to-center distance between adjacent electrode fingers is defined as an in-region center-to-center distance p, the average value of the inter-region center distance p in each of the electrode finger formation regions E1 and E2 is substantially the same between the plurality of electrode finger formation regions E1 and E2. When the thickness of the piezoelectric film is d, d / p is 0.5 or less in the plurality of electrode finger formation regions E1 and E2,. Out of the center-to-center distances between electrode fingers in one electrode finger formation region E1 and electrode fingers in the other electrode finger formation region E2 among adjacent electrode finger formation regions E1 and E2, the shortest center-to-center distance between electrode fingers that are connected to different potentials (the first and second electrode fingers 18 and 19) and the inter-region center distance p in each of the adjacent electrode finger formation regions E1 and E2 are different from each other.

The invention relates to the technical field of bulk acoustic wave resonators, and particularly provides a bulk acoustic wave resonator and a preparation method thereof.The resonator comprises a first substrate, a coating type structure film layer, a bottom electrode, a piezoelectric layer and a top electrode which are sequentially connected from bottom to top, an acoustic reflector is arranged on the coating type structure film layer, a temperature compensation layer is arranged in the bottom electrode, and the piezoelectric layer is arranged on the top electrode; the temperature coefficients of the bottom electrode, the piezoelectric layer and the top electrode are all opposite to the temperature coefficient of the temperature compensation layer; the resonator can effectively restrain resonant frequency drift generated by the bottom electrode, the piezoelectric layer and the top electrode.

This elastic wave device is provided with: a piezoelectric layer having a first main surface and a second main surface; an IDT electrode provided on at least one of the first main surface and the second main surface of the piezoelectric layer, the IDT electrode including a plurality of electrode fingers arranged in a predetermined direction; and a support member facing the second main surface of the piezoelectric layer and having an acoustic reflection portion on the second main surface side of the piezoelectric layer, the plurality of electrode fingers including a first electrode finger located on the outermost side in the arrangement direction of the plurality of electrode fingers and a second electrode finger adjacent to the first electrode finger, the product of the width, height, and density of at least one of the first electrode fingers and the second electrode fingers is larger than the product of the width, height, and density of the electrode fingers in the center different from the first electrode fingers and the second electrode fingers among the plurality of electrode fingers. When the thickness of the piezoelectric layer is d and the distance between the centers of adjacent electrode fingers is p, d / p is 0.5 or less.

Provided is an elastic wave device in which peeling of an acoustic reflective film from a piezoelectric layer can be suppressed.　An elastic wave device 1 of the present invention comprises: an acoustic reflective film 4 that contains one or more high-acoustic impedance layers 6a, 6b which have relatively high acoustic impedance and one or more low-acoustic impedance layers 5a-5c which have relatively low acoustic impedance; a piezoelectric layer 7 that is provided on the acoustic reflective film 4 and that has a first main surface 7a and a second main surface 7b which are opposite from each other; and an IDT electrode 8 that is provided on the first main surface 7a of the piezoelectric layer 7 and that has a plurality of electrode fingers (a plurality of first and second electrode fingers 18 and 19). The low-acoustic impedance layers and the high-acoustic impedance layers are alternately layered. The one or more low-acoustic impedance layers 5a, 5b are low-density silicon oxide layers which have a density of less than 2 g / cm3. The low-density silicon oxide layers each have a third main surface 5x and a fourth main surface 5y which are opposite from each other. The acoustic reflective film 4 further contains at least one adhesion layer 11 which is provided between a high-acoustic impedance layer and at least one from among the third main surface 5x and the fourth main surface 5y of a low-density silicon oxide layer. The density of the adhesion layer 11 is higher than the density of a low-density silicon oxide layer which is in contact with the adhesion layer 11, and is lower than the density of a high-acoustic impedance layer which is in contact with the adhesion layer 11.

The application discloses a dual-mode optical coherence elastography device and method. The device comprises an excitation unit for generating an acoustic field; an imaging unit which is an optical coherence tomography system and is used for detecting the vibration of a sample, i.e. a strain response and an elastic wave response; and a coupling unit which has an acoustic reflection surface with a middle through hole and is used for reflecting the acoustic field generated by the excitation unit so that the coupling between a probe light beam emitted by the imaging unit and the acoustic field emitted by the excitation unit is on the same side of the sample. The application uses a multi-beam optical coherence tomography system to emit two or more probe light beams for dual-mode elastography, and can simultaneously obtain high-resolution strain information and quantitative elastic information of the sample, thereby solving the problem that the prior art cannot simultaneously perform strain imaging and elastic wave imaging.