363 results about "Acoustic reflection" patented technology

A method for determining the speed of sound in a fluid in the region of an implanted, vascular support system includes sending an ultrasonic signal using an ultrasonic sensor, reflecting the ultrasonic signal on at least one sound reflector, receiving the reflected ultrasonic signal, and determining the speed of sound in the fluid using the ultrasonic signal. The at least one sound reflector may be visible in the field of vision of the ultrasonic sensor and arranged at a defined distance at least to the ultrasonic sensor or to a further sound reflector.

The invention discloses a seabed sediment classification method and product based on seabed surface sediment acoustic characteristics, and relates to the field of seabed acoustic detection. The method comprises the following steps: firstly, acquiring actual measurement data of seabed sound reflection of a measurement area in a marine environment, and performing inversion to obtain seabed surface sediment characteristic parameters; by analyzing the uncertainty and correlation of the characteristic parameters of the seabed surface sediments, acoustic characteristic parameters of the seabed surface sediments are screened out; constructing a deep neural network model based on the acoustic characteristic parameters of the seabed surface sediments, wherein the deep neural network model comprises a seabed acoustic-physical information neural network model and a sediment attribute prediction neural network model; expanding the training sample set according to the actual measurement data of seabed sound reflection and the acoustic characteristic parameters of the seabed surface sediments, and training and testing the deep neural network model; the trained seabed sediment classification model is adopted to perform seabed sediment classification of the measurement area, fine classification of the seabed sediment can be realized, and classification continuity and classification precision are improved.

An acoustic wave device includes a support including a support substrate, a piezoelectric layer on the support, an IDT electrode on the piezoelectric layer and including a pair of busbars and electrode fingers, and mass addition films on the electrode fingers. An acoustic reflection portion overlaps at least a portion of the IDT electrode. d / p is about 0.5 or smaller. A region in which adjacent electrode fingers overlap each other is a cross region including a central region, and first and second edge regions. At least a portion of the mass addition films overlap the central region. A width of at least one of the mass addition films is different from a width of other mass addition films.

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 discloses a film bulk acoustic resonator and a filter. The film bulk acoustic resonator comprises a substrate; the substrate comprises a sound reflecting layer; the first electrode is positioned on one side of the substrate; the piezoelectric layer is located on the side, away from the substrate, of the first electrode; the second electrode is located on the side, away from the substrate, of the piezoelectric layer; the first electrode, the piezoelectric layer and the second electrode are overlapped in an effective working area along the thickness direction of the film bulk acoustic resonator; the at least one temperature compensation layer is located between the substrate and the second electrode, and the temperature compensation layer and the effective working area are overlapped in the thickness direction of the film bulk acoustic wave resonator; the temperature compensation layer comprises a plurality of independently arranged temperature compensation structures. By adopting the technical scheme, the temperature drift can be reduced and the performance of the resonator can be improved by arranging the plurality of independently arranged temperature compensation structures, and the working frequency of the resonator can be adjusted by adjusting the area and the thickness of the temperature compensation structures.

Provided are an elastic wave device and an elastic wave filter device capable of suppressing leakage of an elastic wave. This elastic wave device comprises: 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, and including a plurality of electrode fingers arrayed in a predetermined direction; a support member facing the second main surface of the piezoelectric layer, and having an acoustic reflection part 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 that overlaps, in a plan view from the first direction, with a first electrode finger among the plurality of electrode fingers that is positioned on the outermost side in the array direction of the plurality of electrode fingers, the protective film has a first-step surface where a side surface of the protective film is exposed in a direction intersecting the direction in which the first electrode finger extends. When the thickness of the piezoelectric layer is d, and the center-to-center distance between adjacent electrode fingers is p, d / p is 0.5 or less.

An acoustic wave device includes a support, a piezoelectric layer on the support, an IDT electrode on the piezoelectric layer and including busbars and electrode fingers, and mass-added films on the electrode fingers. An acoustic reflection portion is provided in the support and overlaps at least a portion of the IDT electrode. d / p is about 0.5 or less. When viewed in an electrode finger orthogonal direction, a region in which the electrode fingers adjacent to each other overlap each other is an intersecting region including a central region, and first and second edge regions. At least a portion of the mass-added films overlaps the central region in plan view.

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.

The invention relates to the technical field of sound effect optimization, and discloses a sound effect optimization method and device based on a coaxial loudspeaker echo wall sound box, and the method comprises the steps: carrying out the acoustic response measurement and acoustic feature analysis of the coaxial loudspeaker echo wall sound box, and obtaining a frequency domain acoustic response characteristic curve; performing acoustic partition calculation on the internal space of the coaxial loudspeaker echo wall sound box to obtain a spatial arrangement parameter of an acoustic processing unit; carrying out acoustic center positioning calculation on the coaxial loudspeaker to obtain a space coordinate parameter and an axial inclination angle parameter of the coaxial loudspeaker; carrying out sound reflection angle calculation and material combination optimization on the inner wall structure of the echo wall sound box to obtain an inner wall geometric curvature parameter and a box body material lamination parameter; sound pressure level frequency response curve analysis and sound phase positioning precision measurement are carried out on the inner wall geometric curvature parameters and the box body material lamination parameters, sound box acoustic performance verification data are obtained, the uniformity of the sound field in the sound box is guaranteed, and then the acoustic performance of the sound box is improved.

The invention discloses a bimodal optical coherence elastography device and method, and the device comprises an excitation unit which is used for generating a sound field; the imaging unit is an optical coherence tomography system and is used for detecting vibration of the sample to be detected, namely strain response and elastic wave response; and the coupling unit is provided with a sound reflecting surface with a middle through hole and is used for reflecting the sound field generated by the excitation unit, so that the detection light beam emitted by the imaging unit and the sound field emitted by the excitation unit are coupled and irradiated on the same side of the to-be-detected sample. According to the invention, the multi-beam optical coherence tomography system is utilized to emit two or more detection beams to carry out bimodal elastic imaging, high-resolution strain information and quantitative elastic information of the sample to be detected can be obtained at the same time, and the problem that strain imaging and elastic wave imaging cannot be carried out at the same time in the prior art is solved.

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 discloses a hydrophone low-frequency sensitivity calibration method based on time domain scaling average processing, relates to the technical field of hydrophone low-frequency sensitivity calibration, and solves the problem of inaccurate direct sound wave amplitude measurement caused by boundary sound reflection superposition of an experimental pool and a measuring device in hydrophone calibration. Comprising the following steps: placing a light-reflecting and sound-transmitting thin film in a water body, and carrying out transducer and thin film laying and laser focusing; the underwater sound pressure value is reproduced based on a laser interference method; when reflection sound and direct sound superposition occurs in low-frequency measurement data, adjacent frequency points are selected to carry out multiple times of measurement. The arrival time of the direct sound is accurately measured by transmitting the high-frequency sound pulse, so that alignment of starting points of waveform data with different frequencies is realized; when low-frequency measurement is carried out, not only data of the inspected frequency is collected, but a narrow frequency band near the inspected frequency is selected, and multi-frequency-point data is sequentially collected and subjected to subsequent algorithm processing.

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.

The invention relates to the technical field of bulk acoustic wave resonators, and particularly provides a bulk acoustic wave resonator and a bulk acoustic wave filter capable of reducing stray modalities, and the resonator comprises a substrate, a bottom electrode, a piezoelectric layer and a top electrode which are sequentially connected from bottom to top; the top electrode is provided with a plane part and an irregular frame part which are located above the sound reflecting mirror, the irregular frame part protrudes out of or is sunken into the plane part, and the outer contour of the cross section of the irregular frame part is irregular; the outer boundary of the projection of the irregular frame portion in the plan view direction is located within the outer boundary of the projection of the planar portion in the plan view direction and the outer boundary of the projection of the acoustic mirror in the plan view direction, and the irregular frame portion is located within the planar portion in the plan view direction. The resonator can effectively solve the problems that a stray mode is formed near a series resonant frequency and the performance of a bulk acoustic wave filter is deteriorated due to improper size setting of the convex structure or the concave structure.

The invention discloses storage tank bottom plate detection equipment based on an in-oil detection robot, and relates to the technical field of storage tank detection, and the equipment comprises the in-oil detection robot, a navigation module and an upper computer; the navigation module is used for collecting positioning points of the oil detection robot at all moments, and performing path tracking on the oil detection robot by adopting a path tracking algorithm based on linear regression according to the collected positioning points and the reference path; the oil detection robot comprises a magnetic flux leakage detection module and an ultrasonic and acoustic emission detection module which are connected with the upper computer, and the upper computer is used for carrying out defect detection on the storage tank bottom plate according to a magnetic field signal collected by the magnetic flux leakage detection module and an ultrasonic echo signal and an acoustic reflection signal collected by the ultrasonic and acoustic emission detection module. The positioning error can be reduced, and the reliability of path control is improved.

An acoustic wave device includes a piezoelectric substrate that includes a support including a support substrate and a piezoelectric film including a piezoelectric layer on the support, and an IDT electrode, on the piezoelectric layer, that includes first and second busbars facing each other, and first and second electrode fingers. An acoustic reflection portion is located where the support overlaps the IDT electrode in plan view. When a thickness of the piezoelectric film is d and a center-to-center distance between the first and second electrode fingers adjacent to each other is p, d / p is about 0.5 or less. An overlap region is where the first and second electrode fingers adjacent to each other overlap in an electrode finger orthogonal direction and includes a middle region, and first and second edge regions on both sides of the middle region in an electrode finger extension direction.

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.

This elastic wave device comprises: 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 and including a plurality of electrode fingers arrayed in a predetermined direction; a reflector disposed adjacent to the IDT electrode in the array direction of the plurality of electrode fingers; a support member facing the second main surface of the piezoelectric layer and having an acoustic reflection part on the second main surface side of the piezoelectric layer; and a load film provided in a region overlapping the reflector in plan view from the first direction. 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 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.

Provided are an elastic wave device and an elastic wave filter device capable of suppressing leakage of an elastic wave. This elastic wave device comprises: a piezoelectric layer that has a first main surface and a second main surface; an IDT electrode that is provided on at least one of the first main surface and the second main surface of the piezoelectric layer, and that includes a plurality of electrode fingers; a support member that faces the second main surface of the piezoelectric layer, and has an acoustic reflection part on the second main surface side of the piezoelectric layer; and a load film that is provided over a region overlapping at least, in a plan view from the first direction, the fourth electrode finger from one outer side to the fourth electrode finger from the other outer side in the array direction among the plurality of electrode fingers. The load film is not provided in at least a part of a region that overlaps, in the plan view, a first electrode finger among the plurality of electrode fingers that is on the outermost side in the array direction. When the thickness of the piezoelectric layer is d, and the center-to-center distance between adjacent electrode fingers is p, d / p is 0.5 or less.