160 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.

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 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.

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.

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 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.

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.

This invention provides a method for manufacturing a bulk acoustic wave resonator, including a substrate provision step, an acoustic reflection structure formation step, and a stacked structure formation step. The stacked structure formation step includes: sequentially forming a lower electrode, a first piezoelectric layer, a second piezoelectric layer, and an upper electrode from bottom to top on the substrate or the acoustic reflection structure. The upper electrode, the second piezoelectric layer, the first piezoelectric layer, the lower electrode, and the acoustic reflection structure have an overlapping region in the device thickness direction, which constitutes the resonant region of the bulk acoustic wave resonator. The first piezoelectric layer is implemented using a doped piezoelectric material, which is doped with impurity elements to improve the electromechanical coupling coefficient of the first piezoelectric layer. The second piezoelectric layer is implemented using an undoped piezoelectric material. Correspondingly, this invention also provides a bulk acoustic wave resonator and a filter. Implementing this invention can yield a bulk acoustic wave resonator that balances electromechanical coupling coefficient and quality factor, has low parasitic modes, and exhibits stress balance.

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.

Systems and methods for classifying and / or characterizing a user interface are disclosed. The systems and methods include generating acoustic data associated with acoustic reflections of an acoustic signal, the acoustic reflections being indicative, at least in part, of one or more characteristics of a user interface coupled to a respiratory treatment device via a conduit. The systems and methods further include analyzing the generated acoustic data. The systems and methods further include classifying and / or characterizing the user interface based, at least in part, on the analyzed acoustic data.

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.

The invention provides an ultrasonic guided temperature measuring device and method based on a single crystal optical fiber bundle. According to the invention, the single-crystal optical fiber bundle is used for replacing the conventional single-crystal optical fiber with a groove structure as an ultrasonic guided temperature measurement structure, only the ultrasonic echo signal of the end face of each single-crystal optical fiber needs to be collected, a relation model between the end face waves of the adjacent single-crystal optical fibers is analyzed, no sound reflection structures such as grooves and convex joints need to be additionally introduced, and the structural stability is greatly improved. Besides, each optical fiber in the single-crystal optical fiber bundle has only one sound reflecting surface, and the sound wave propagation loss is low, so that the scheme can realize multi-interval distributed temperature measurement by adjusting the number and the length of the optical fibers in the single-crystal optical fiber bundle; the problems of structural damage and acoustic signal attenuation caused by a single waveguide rod multi-reflection structure in a conventional ultrasonic waveguide scheme are solved.

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.

Disclosed is a method for manufacturing an acoustic multilayer film device (1) which comprises: a substrate (10); an acoustic reflection layer (20) that includes a low acoustic impedance layer (22) and a high acoustic impedance layer (21) having a higher acoustic impedance than the low acoustic impedance layer (22); and an acoustic resonator (30) that is superposed on the acoustic reflection layer (20). This method for manufacturing an acoustic multilayer film device (1) includes a high acoustic impedance layer formation step (S11) for forming the high acoustic impedance layer (21) by performing sputtering on the substrate (10) using Yb oxide or SiC as a target material (200).

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.

Provided is an acoustic resonator in a transverse excitation shear mode. The acoustic resonator comprises: an acoustic mirror (120), which comprises at least one first acoustic reflecting layer (121, 123, 125) and at least one second acoustic reflecting layer (122, 124), wherein the acoustic impedance of each first acoustic reflecting layer is less than that of each second acoustic reflecting layer; a piezoelectric layer (130), which is arranged on the acoustic mirror, and which comprises lithium niobate of a single crystal material and / or lithium tantalate of a single crystal material; electrode units (142, 143, 144), which are arranged on the piezoelectric layer (130) and are used for forming an electric field; and transverse reflectors (152, 154), which are arranged on the piezoelectric layer, are used for transversely reflecting acoustic waves, and can have a high electromechanical coupling coefficient and a high Q value at a frequency greater than 3 GHz.

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.