90 results about "Acoustic reflection" patented technology

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.

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.

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.

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 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.

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.

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.

Systems and methods configured to generate talker coordinates for directing a camera towards an active talker in the presence of acoustic reflections are disclosed. One method comprises receiving sound location information for a detected audio source from a microphone; determining, based on the sound location information, a first set of coordinates representing an estimated talker location; determining, based on the sound location information and a height of the environment, a second set of coordinates representing a corrected talker location; calculating a weighted height coordinate based on a first height coordinate of the first set of coordinates, a second height coordinate of the second set of coordinates, and stored height coordinates from previously detected audio sources; and transmitting, to a camera, a third set of coordinates comprising the weighted height coordinate and representing a final talker location, to cause the camera to point its image capturing component towards the received location.

The present invention relates to a photoacoustic array probe comprising: a transducer array in which a plurality of transducer elements for detecting photoacoustic waves generated by light irradiated at a subject are arranged; an acoustic reflector arranged to face the transducer array so as to form a plurality of virtual detection points having a function of detecting the photoacoustic waves by reflecting ultrasonic waves generated from the plurality of transducer elements; and a driver for driving rotational motion of the acoustic reflector and / or linear motion of the transducer array and the acoustic reflector, wherein the formation range of the virtual detection points increases according to driving of the driver.

This invention provides a CD147-targeting nano-ultrasound contrast agent, its preparation method, and its application. The contrast agent comprises: microbial-derived gas vesicles and CD147 nanoantibodies linked to the surface of the gas vesicles via a coupling agent. The hollow nanostructure of the gas vesicles in this invention endows the contrast agent with highly efficient acoustic reflection capabilities, significantly improving the ultrasound signal intensity. The CD147 nanoantibodies possess high affinity and high specificity, enabling precise recognition of the CD147 antigen on the surface of tumor cells. This invention uses biosynthesized gas vesicles instead of traditional chemically synthesized gas microbubbles, combined with a simple and efficient coupling process, significantly reducing preparation difficulty and equipment dependence. The contrast agent of this invention overcomes the shortcomings of existing technologies in imaging performance, targeting, preparation process, safety, and multifunctional diagnostic and therapeutic capabilities, providing a novel technical pathway for precision diagnosis and treatment of tumors.

A bulk acoustic wave resonance device includes: an acoustic reflection layer; the first electrode layer comprises a first resonance part and a first extension part; a piezoelectric layer; the second electrode layer comprises a second resonance part and a second extension part; a dielectric layer, wherein a first dielectric part of the dielectric layer is located between a part of the first extension part and the piezoelectric layer; the load layer corresponds to the second extension part; the first attenuation area is used for attenuating sound waves; and the first limiting area is used for reflecting sound waves. The first-order transverse mode can pass through the first attenuation area without being affected, and then is fully reflected back to the resonance area in the first limiting area, so that transverse leaky waves are reduced; the high-order lateral parasitic mode entering the first attenuation region is attenuated, and only a small number or even no high-order lateral parasitic mode enters the first confinement region, so that the parallel impedance value and the corresponding Q value can be improved.

This elastic wave resonator includes: a piezoelectric layer having a first main surface and a second main surface on an opposite side from the first main surface; a first electrode provided on the first main surface of the piezoelectric layer; a second electrode provided on the second main surface of the piezoelectric layer and facing the first electrode with the piezoelectric layer in between; a plurality of surface electrodes provided on the first main surface of the piezoelectric layer for electrically connecting the first electrode and the second electrode to an external substrate; a first acoustic reflecting portion formed of a laminate including a first low acoustic impedance layer and a first high acoustic impedance layer, the first low acoustic impedance layer being provided on the first main surface of the piezoelectric layer and on the plurality of surface electrodes, and the first high acoustic impedance layer having an acoustic impedance higher than that of the first low acoustic impedance layer; and a support member provided on the first main surface side of the piezoelectric layer, on the side opposite from the piezoelectric layer of the first acoustic reflecting portion. In the first acoustic reflecting portion, the first low acoustic impedance layer is made of an insulating material, and the first high acoustic impedance layer is made of a conductive material.

The application provides a film bulk acoustic resonator, comprising a substrate, an acoustic reflection structure arranged on one side of the substrate, a bottom electrode arranged on one side of the acoustic reflection structure, a piezoelectric film covering the bottom electrode, and a top electrode arranged on the side of the piezoelectric film away from the bottom electrode, wherein the side of the top electrode away from the piezoelectric film is provided with an interdigital protruding frame, the interdigital protruding frame comprises oppositely arranged first and second protruding frames, at least one pair of interdigital structures are formed by extending the first and second protruding frames towards each other and being spaced apart by a preset distance and being overlapped, and each interdigital structure comprises two interdigital structures spaced apart by a preset distance along the overlapping direction. The application can reflect two or more transverse Rayleigh-Lamb waves to achieve high reflection efficiency and improve the Q value corresponding to the anti-resonance frequency of the resonator. The peeling residue problem caused by the closed loop of the existing protruding frame can be improved.

The invention provides an underwater near-field sensing method and system based on a mechanical scanning sonar and an optical camera, and the method comprises the steps: obtaining echo data of the mechanical scanning sonar, and carrying out the preprocessing of the echo data, and obtaining sonar image data; after sonar image data is processed, a near-field acoustic boundary is obtained by combining near-field environment acoustic reflection propagation characteristics, and a real near-field boundary is further obtained; acquiring an optical image, and acquiring a near-field optical enhancement image based on an underwater light propagation model compensation and weight fusion image enhancement method; and synchronizing and outputting the near-field acoustic boundary and the near-field optical enhancement image by using a timestamp. Different sensing modes of acoustics and optics are combined, sonar focuses on geometric boundary and scale measurement, optics provides visual details and textures through double-branch multi-scale fusion of underwater light propagation compensation and non-blind sharpening, two paths of information are clear in positioning and do not interfere with each other, the system can obtain the sensing ability of structure contours and texture details at the same time, and the accuracy of the system is improved. Therefore, the identifiability and integrity of the near-field environmental elements are improved.

The invention discloses a finite box rectangular horn shape optimization method and system based on a hybrid model, and the method comprises the steps: carrying out the geometric discretization of a rectangular horn in the axial direction into rectangular pipeline sections which are connected end to end, and determining a to-be-optimized design variable; pre-calculating a radiation impedance matrix and a far-field directivity primary function vector under a finite box body by adopting an external radiation model; calculating an inlet impedance matrix and a speed transmission matrix of each rectangular pipeline section on the basis of a radiation impedance matrix and a current design variable by adopting a sound transmission model in the horn, obtaining a mouth output speed vector, and solving an acoustic performance index in combination with a far-field directivity primary function vector; and constructing a comprehensive objective function, and solving to obtain a finite box rectangular horn shape optimization scheme. According to the method, the edge diffraction and sound reflection effect in a limited box environment can be accurately simulated, and the radiation efficiency optimization and directivity control of the broadband of the rectangular horn are realized while the calculation cost is remarkably reduced.

The application provides a method for testing and visualizing analysis of sound wave generation and propagation process, comprising the following steps: S1, installing acceleration sensors at different positions of a mechanical structure generating intense vibration, measuring vibration state of the mechanical structure, and characterizing vibration features of the mechanical structure based on vibration acceleration data of the acceleration sensors at different positions and interpolation; S2, calculating normal sound wave speed variables of particles at the surface of the mechanical structure in air or water medium based on normal acceleration fluctuation variables of the vibration features of the mechanical structure; S3, using linear Euler equation to describe evolution states of energy dissipation, sound scattering and sound reflection of the normal sound wave speed variables in the propagation process; and S4, performing data visualizing analysis based on the evolution states. The application improves the design capability of noise suppression of mechanical equipment, and enables intuitive observation of the generation and propagation states of sound waves by using visualizing analysis.

Provided is an elastic wave device that improves resonance characteristics in a high-order mode. The elastic wave device comprises: a piezoelectric laminate having a first main surface and a second main surface on the opposite side from the first main surface in a first direction; an electrode provided on at least one among the first main surface and the second main surface of the piezoelectric laminate; and a support member provided on the second main surface side of the piezoelectric laminate and having an acoustic reflection part on the second main surface side of the piezoelectric laminate. At least a portion of the electrode is disposed so as to overlap the acoustic reflection part in a plan view in the first direction. The piezoelectric laminate comprises: a first piezoelectric layer having the second main surface; an intermediate layer laminated on the first piezoelectric layer; and a second piezoelectric layer laminated on the intermediate layer. At least one among the material and the polarization direction of the intermediate layer is different from that of the first piezoelectric layer. At least one among the material and the polarization direction of the intermediate layer is different from that of the second piezoelectric layer.

The present invention improves resonance characteristics. This elastic wave device comprises: a piezoelectric layer, which has a first main surface and a second main surface on the opposite side from the first main surface, and which contains lithium niobate; an IDT electrode provided on the main-surface side of the first main surface and / or the second main surface; a dielectric layer provided on the main surface of the first main surface and / or the second main surface of the piezoelectric layer; and a support member provided on the second-main-surface side of the piezoelectric layer. The IDT electrode has a first busbar and a second bus bar that face each other, at least one first electrode finger having a base end connected to the first busbar, and at least one second electrode finger having a base end connected to the second busbar. The support member has an acoustic reflection part on the second-main-surface side. Let d be the thickness of the piezoelectric layer and p be the average of the center-to-center distance between adjacent first and second electrode fingers, in which case d / p is 0.5 or less. Let T be the total of the thickness of the piezoelectric layer and the sum of the thickness of each of the dielectric layer(s), in which case p / T is between 3.0 and 6.0, inclusive.

A surface-acoustic-wave (SAW) resonator includes a substrate formed from an anisotropic crystal and first and second acoustic reflectors disposed on a surface of the substrate. The first and second acoustic reflectors face each other to form an acoustic cavity whose axis is aligned with a crystallographic orientation of the anisotropic crystal such that the SAW resonator is minimally diffracting at cryogenic temperatures. The substrate may be a piezoelectric crystal, in which case the acoustic cavity can be excited by driving electrodes located on the surface of the substrate. Since the SAW resonator is minimally diffracting, it has less loss, and therefore can achieve higher Qs, than SAW resonators based on other crystallographic orientations.

An elastic wave device comprises at least two resonators. Each resonator is provided with: a piezoelectric layer having a first main surface and a second main surface that face each other; an electrode provided on at least one of the first main surface and the second main surface of the piezoelectric layer; a plurality of dielectric layers laminated on the first main surface or the second main surface of the piezoelectric layer, the plurality of dielectric layers including at least a first dielectric layer and a second dielectric layer; and a support member provided on the second-main-surface side of the piezoelectric layer, the support member having an acoustic reflection part on the second-main-surface side of the piezoelectric layer. Among the plurality of dielectric layers, at least the first dielectric layer and the second dielectric layer have mutually different acoustic impedances.

In an acoustic mirror of a bulk-acoustic wave (BAW) device, acoustic energy is reflected at interfaces of layers having different acoustic impedances, and the wavelengths of the acoustic energy reflected at each layer depends on the layer thickness. The acoustic mirror comprises a patterned layer including a first region of a first material and a second region of the first material separated by a second material to reduce an effective thickness of the layer for acoustic reflection. As operating frequencies in wireless devices increase, current manufacturing practices may be unable to produce the correspondingly thinner layers of the acoustic mirror. Thus, the BAW device described herein can be employed to provide a reduced effective thickness for acoustic reflection with layers having an actual thickness that can be formed by existing manufacturing practices. In some examples, the first material and the second material have different acoustic impedances.

The application discloses a kind of methods for measuring the sound reflection coefficient of material in acoustic tube, which comprises the following steps: firstly, the sample to be tested is placed in the test environment to emit and collect signals, and discrete Fourier transform is carried out to establish the sparse matrix form of sound receiving signal; then, the Bayesian formula containing hyperparameters is determined, and the hyperparameters are recursively solved to obtain the estimation result of multipath time delay; then, single-frequency PCW signal is emitted and collected, and the least square method is used to solve the amplitude parameter to obtain the estimation result of optimal multipath amplitude; finally, according to the estimation result of multipath time delay and the estimation result of multipath amplitude, the incident direct wave and the first reflected wave are extracted and separated, and the reflection coefficient of the sample to be tested is calculated. By using the sparse Bayesian learning method and the least square method, the application realizes the time delay estimation and amplitude estimation of multipath signal in acoustic tube, and achieves the purpose of separating multipath signal and calculating the reflection coefficient of acoustic material.

The invention provides an elastic wave device and an elastic wave filter device capable of suppressing leakage of elastic waves. An elastic wave device includes: a piezoelectric layer having a first main surface and a second main surface facing the first main surface in a first direction; 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; 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; and a protective film provided on at least one of the first main surface and the second main surface of the piezoelectric layer. In a region overlapping a first electrode finger located on the outermost side in the arrangement direction of the plurality of electrode fingers in plan view from the first direction, the protective film has a surface of a first step in which a side surface of the protective film is exposed in a direction intersecting a direction in which the first electrode finger extends. 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.

The invention discloses a coffee machine voice interaction method and system, and relates to the technical field of voice interaction. The method comprises the following steps: when the coffee machine does not perform voice interaction, detecting a kitchen space and monitoring environment background sound, and constructing and dynamically updating a kitchen environment acoustic space model at least representing a noise source physical position, acoustic characteristics and a sound reflection path; when a user voice instruction is detected, accurately positioning the mouth position of the user based on a sound reflection path in the model; performing spatial enhancement, active noise cancellation and active echo cancellation on the mixed audio signal containing the user voice instruction in parallel so as to separate out a pure user voice signal; and identifying the pure user voice signal and executing a corresponding coffee making instruction. According to the method, the acoustic space model is constructed and processed in parallel, so that the noise and echo interference problem in a complex acoustic environment of a kitchen is effectively solved, and the voice recognition accuracy and interaction fluency are remarkably improved.

The invention relates to the technical field of sound equipment, discloses a sound equipment playing control method and system based on a voice sensor, and aims to solve the problem that audio experience is disjointed due to the fact that an existing sound equipment system cannot sense a continuously changing acoustic environment and a user state. According to the method, acoustic signals are collected in real time through a multi-channel voice sensor array, a three-dimensional position track, an emotional state label and a room impulse response function of an audience are extracted, a multi-dimensional dynamic scene state descriptor is constructed in a fusion mode, and sound field rendering parameters such as a direct sound / reflected sound energy ratio, reverberation time, an equilibrium curve and sound image diffusion degree are generated according to the descriptor. And dynamically synthesizing a personalized three-dimensional sound field matched with the current scene. The system comprises an acoustic signal acquisition module, a scene feature extraction module, a state fusion modeling module, a rendering parameter generation module and a dynamic sound field synthesis module. According to the method and the device, the conversion from passive instruction response to active environment adaptation is realized, and the audio immersion and the man-machine interaction naturalness are remarkably improved.

The invention belongs to the technical field of ultrasonic wave application, and particularly relates to an implementation method for generating a vortex focusing acoustic beam, which comprises the following steps of: incident focusing ultrasonic wave into an acoustic reflection cavity, and forming a space reflection mechanism in the acoustic reflection cavity; performing multiple times of reflection and transmission on sound waves by using the space reflection mechanism to form focused sound beams with different apertures and focal lengths; performing phase delay and wavefront distortion on the focused sound beam to generate a plurality of vortex focused sound beams carrying orbital angular momentum; and separation and continuous modulation of focus distribution are carried out on the vortex focusing sound beam through the space reflection mechanism, a plurality of cascaded short-focus vortex focuses are formed on a sound axis, the vortex focusing sound beam with an ultra-long focus region is synthesized through superposition, and the problems that in the prior art, the mode of generating the vortex focusing sound beam is complex and the stability is poor are solved.

The application discloses a tunnel deformation measurement method, system and device based on echo space perception and acoustic coating and a storage medium; the tunnel three-dimensional curved surface model is established, the monitoring points are generated based on the curvature self-adaption, the special acoustic reflection coating is arranged at the monitoring points, the non-contact echo perception and data fusion are carried out by using the acoustic ranging device, the high-precision and automatic monitoring of the tunnel deformation is realized, the problems of poor applicability, low precision and insufficient efficiency of the traditional method in the complex environment are solved, and the reliability and intelligent level of the tunnel structure health monitoring are remarkably improved.

Disclosed and described herein are systems, methods and device for drone-based multi-physics measurement and acquisition wherein a drone flies above samples to rapidly acquire a large volume of data (standard photos, multispectral images, acoustic reflection data, and electromagnetic reflection data, among others). By integrating data acquired by the conventional camera, multispectral camera, acoustic / electromagnetic systems, and other sensor systems, accurate information on lithology, composition, elastic properties, and the like of the samples can be obtained without the need for time-consuming manual analysis.