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79 results about "Acoustic medium" patented technology

Adaptive system for efficient transmission of power and data through acoustic media

An apparatus and method for transmitting data and power through a metal barrier using ultrasonic waves, having ultrasonic transmission channels through the barrier formed by coupling ultrasonic transducers on opposite sides of the barrier. A power transmitter sends power over a channel and forward and reverse data transmitters send forward and reverse data signals by orthogonal frequency-division multiplexing OFDM over a separate channel. The data signals are made up of plural sub-carriers at plural different sub-carrier frequencies with none of the sub-carriers of the forward transmission signal being at a power harmonic frequency.
Owner:RENESSELAER POLYTECHNIC INST

Method and device for measuring speed and frequency of ultrasonic traveling wave in liquid

The invention discloses a method and a device for measuring the speed and frequency of ultrasonic traveling wave in a liquid. The method comprises the following steps that a monochromatic parallel light beam is vertical to an ultrasonic transmission direction and radiates a dynamic ultrasonic grating that the ultrasonic wave forms in the liquid; the dynamic ultrasonic grating penetrates through a lens and the diffraction spectrum of a traveling wave ultrasonic phase grating is formed; the spectrum is processed and imaged through an amplitude filter and an imaging lens, and a spectrum image of the ultrasonic traveling wave grating is obtained; the spacing of two adjacent spectral lines on the spectrum image is measured, and the wavelength of the ultrasonic wave in the liquid is calculated; the change of an electrical signal after the previous level of spectrum and zero level spectrum of the spectrum image are mixed is detected or recorded, and the frequency of the ultrasonic wave is worked out; the speed of the ultrasonic wave in the liquid is worked out through the wavelength and the frequency. The device for realizing the method comprises a light source, a transparent sink, a lens I, the amplitude filter, the imaging lens and the measuring device which are sequentially connected, and a sound-absorbing medium and the ultrasonic transducer are arranged in the transparent sink and are respectively arranged on both sides.
Owner:SOUTH CHINA NORMAL UNIVERSITY

Blocking Plate Structure for Improved Acoustic Transmission Efficiency

An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.
Owner:ULTRAHAPTICS IP LTD

Blocking Plate Structure for Improved Acoustic Transmission Efficiency

An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.
Owner:ULTRAHAPTICS IP LTD

Blocking plate structure for improved acoustic transmission efficiency

An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.
Owner:ULTRAHAPTICS IP LTD

Ultrasonic probe and ultrasonic diagnostic equipment

A flexible shaft is inserted through a sheath constituting an insertion portion of an ultrasonic probe connected to an ultrasonic observation apparatus, an ultrasonic transducer driven to rotate, etc., is attached at the distal end portion thereof, and an ultrasonic wave can be transmitted and received through an acoustic window arranged around thereof. By using hydrocarbon-based oil having a kinematic viscosity of 20 mm2 / s as an acoustic medium for filling the surrounding of the ultrasonic transducer in the acoustic window, ultrasonic attenuation at high frequencies can be reduced, decrease of the capacity of the acoustic medium due to volatilization can be reduced, and decrease of the capacity of the acoustic medium due to volatilization is reduced.
Owner:OLYMPUS CORP

Method for processing seismic exploration data in process of controlling full acoustic wave equation inversion

The invention relates to a method for processing seismic exploration data in the process of controlling full acoustic wave equation inversion. The method comprises the following steps: acquiring seismic data of a theoretical model to obtain a depth-domain bulk modulus and density initial model; simulating a seismic wave field in an acoustic medium by a pseudo-spectral method; calculating the difference of analog data of the theoretical model and the initial model; giving that delta is equal to 1.0 e-6; calculating error energy E; when E is less than or equal to delta, stopping inversion and outputting the inversion result; if E is more than delta, continuing the following steps; calculating residual error data; calculating the conjugated modification quantity of the bulk modulus and density model; calculating the modified step length to obtain the gradient; modifying the initial model; using the modified model data as a new initial model; carrying out automatic control on the inversion process to make the acoustic wave equation inversion stable, rapid and convergent and improve the inversion convergence speed by nearly five times than a routine method.
Owner:PETROCHINA CO LTD

Viscous-acoustic undulating surface forward modeling system and method based on viscous-acoustic quasi-differential equation

ActiveCN108646293AOvercoming the Effects of SimulationAccurate wave field characteristicsSeismic signal processingMatrix differential equationAcoustic medium
The present invention provides a viscous-acoustic undulating surface forward modeling system and method based on a viscous-acoustic quasi-differential equation, belonging to the field of oil exploration. The method comprises the following steps of: performing irregular mesh generation of speed and quality factors, mapping the speed and quality factors in a mesh coordinate system, mapping a traditional first-order viscous-acoustic-stress equation to a curved mesh coordinate system, and applying the first-order viscous-acoustic-stress equation in the curved mesh coordinate system to deduce a second-order viscous-acoustic quasi-differential equation without memory variables in the same coordinate system. The new viscous-acoustic equation can better control the amplitude loss and phase dispersion caused by the viscous-acoustic medium to more accurately simulate the propagating precision of the viscous-acoustic medium of the undulating surface in a seismic wave, and when the equation is solved, a mixed space partial derivative difference method is provided to perform solution, and a new boundary condition suitable for an undulating surface curved mesh coordinate system is provided to absorb artificial boundary reflection.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Frequency domain visco-acoustic medium full waveform inversion method

The invention provides a frequency domain visco-acoustic medium full waveform inversion method, which comprises the steps of using a truncated Newton method to perform a joint inversion on velocity and a Q value, and selecting an optimized hybrid interleaving difference format to discretize a wave equation. The method of the invention improves the artifact phenomenon and improves the effect and efficiency of the joint inversion.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Probe and object information acquisition apparatus using the same

A probe is provided in which penetration of an acoustic medium into a support layer of an optical reflection member through a pinhole or a scratch on an optical reflection layer is suppressed, occurrence of a solvent crack is suppressed, and noise due to photoacoustic waves that occurs on a receiving surface can be suppressed. The probe includes an element having at least one cell in which a vibration film containing one electrode out of two electrodes that are provided so as to interpose a space therebetween is vibratably supported. The probe further includes a support layer disposed on the vibration film, and an optical reflection layer disposed on the support layer. A protection layer against an acoustic medium is formed on the optical reflection layer.
Owner:CANON KK

Optoacoustic image pick-up system and optoacoustic image pick-up device

In the present invention, an optoacoustic image pick-up system is provided with the following: an ultrasonic wave wave source (1) for projecting to a subject of image pick-up (4) ultrasonic waves formed by an acoustic signal having temporal waveforms that are repeated at a predetermined time interval; an acoustic lens (6) that is disposed so as to receive the scattered waves of ultrasonic waves (2) projected onto the subject of image pick-up (4) and that converts the scattered waves to plane waves; a translucent acoustic medium (8) provided in a region including a light axis (7) of the acoustic lens (6), the region being on the opposite side of the acoustic lens (6) from the subject of image pick-up (4); a light source (11) that emits single color light plane waves and that is disposed so that the advancing direction of the single color light plane waves and the light axis (7) of the acoustic lens (6) intersect at an angle other than 90 degrees and 180 degrees; an image forming lens (16) disposed so as to focus the diffraction light (201) of the single color light plane waves that was generated within the translucent acoustic medium (8); an image receiving unit (17) that acquires an optical image (18) formed by the image forming lens (16) as image information; and a distortion compensation unit (15) that corrects the distortion of the optical image (18) or the distortion of the image generated from the image information.
Owner:PANASONIC CORP

Ultrasonic Probe

An ultrasonic probe is configured such that: a piezoelectric element group is housed within a sealed container so as to be rotated and oscillated left and right about a center line that equally divides a plate surface of the piezoelectric element group; and the sealed container is filled with a liquid that serves as an acoustic medium, and in the sealed container there are provided an inlet hole for the liquid as well as an exhaust hole, to the inlet hole there is connected a flexible tube that functions as a diaphragm, and on the flexible tube and the exhaust hole there are respectively provided sealing lids. As a result, there is provided an ultrasonic probe that prevents an occurrence of air bubbles in a liquid that serves as an ultrasonic wave medium, and that realizes excellent ultrasonic characteristics.
Owner:NIHON DEMPA KOGYO CO LTD

Spherical transmission wave characteristic analysis method and computer readable storage medium

ActiveCN110954959AEliminate spherical diffusion effectsEliminate the effects of diffusionSeismic signal processingAcoustic mediumClassical mechanics
The invention discloses a spherical transmission wave characteristic analysis method and a computer readable storage medium. The method comprises the following steps of calculating a spherical wave transmission wave field of a receiving point based on an acoustic medium model; calculating a virtual seismic source incident wave field of the receiving point, wherein the virtual seismic source incident wave field is set to be the same as a spherical wave transmission wave field in propagation path; calculating a spherical wave transmission coefficient according to the spherical wave transmissionwave field and the virtual seismic source incident wave field; and analyzing the spherical wave characteristics according to the spherical wave transmission coefficient. According to the invention, the spherical wave transmission characteristics are analyzed through the calculated spherical wave transmission coefficient, so that the propagation characteristics and rules of the spherical waves in the medium are better researched and analyzed based on the spherical wave theory of the point source, a more accurate seismic exploration method technology is further developed, and the method has thevery important theoretical value and practical significance for the spherical wave theory of the point source.
Owner:CHINA PETROLEUM & CHEM CORP +1

Passive mode carbon nanotube underwater acoustic transducer

A passive carbon nanotube transducer is provided. The passive carbon nanotube transducer includes shells as protective walls for the top and bottom housing of the transducer with carbon nanotube sheets affixed between the shells. The shells act as acoustic windows that match the surrounding acoustic medium. A gasket encloses the shells and carbon nanotube sheets of the transducer. Each carbon nanotube sheet has an electrode at both ends. Multiple carbon nanotube sheets are capable of sensing sound induced environment temperature deviations and converting electric voltage or current for passive acoustic detection.
Owner:UNITED STATES OF AMERICA

Ultrasonic transducer acoustoelectric closed-loop impedance measuring method and device

The invention provides an ultrasonic transducer acoustoelectric closed-loop impedance measuring method and device. According to the method, in measurement, when an ultrasonic transducer is in an acoustoelectric conversion state, a transmitted broadband signal is converted into a sound signal through a transmitting ultrasonic transducer, the sound signal goes through an acoustic medium and is converted into an electric signal by a receiving ultrasonic transducer, and an acoustoelectric closed-loop measuring circuit from an electric signal to a sound signal and then to an electric signal is formed. Through calculating the acoustoelectric closed-loop channel response of a broadband range, through an equivalent circuit of the acoustoelectric closed-loop channel, the parameter of each element in an ultrasonic transducer closed-loop equivalent circuit is fitted, and thus the impedance of the ultrasonic transducer is obtained. The device comprises a data processing background, a measurement transmitting module, the acoustic medium, and a measurement receiving module. The device of the invention is simple, and a measurement result is the impedance of the ultrasonic transducer in the acoustoelectric conversion state and has a more practical reference value.
Owner:SOUTH CHINA UNIV OF TECH

Resonant sound making helmet

The invention provides a resonant sound making helmet which comprises a helmet body and a power supply device, sound making resonant modules, a communication module and a control circuit board which are arranged on the helmet body. The power supply device supplies power to the sound making resonant modules and the communication module. A voice module is connected with external audio equipment through the communication module. Each sound making resonant module comprises a vibration system, a magnetic circuit system and a fixing block. The vibration systems are provided with coils, one end of each fixing block is connected to the corresponding coil, and the other end of each fixing block is fixed to the helmet body. When the resonant sound making helmet works, the magnetic circuit systems drive the fixing blocks to vibrate, accordingly the helmet body conducts synchronous vibration, the sound making resonant modules and the helmet body are made to generate resonance, the sound making medium and a sound cavity are different from those of an existing helmet, the sound quality is good, the whole helmet body forms the sound cavity, vibration and sound production are conducted without the air medium, the resonant sound making helmet can spread sound at the frequency of 360 degrees, no box body standing wave exists, original sound quality of various pieces of vocal music is maintained, and the sound quality of all frequency bands is extremely clear.
Owner:陈昊 +1

Optical microphone

ActiveUS20130230329A1High detection sensitivityHighly resistant against ambient environment fluctuationsMicrophonesOptical signal transducersAcoustic mediumPhase shifted
An optical microphone includes: a light source; a first polarizer for allowing linearly-polarized light, of light output from the light source, to pass therethrough; a second polarizer for allowing linearly-polarized light having a different polarization plane from the first polarizer to pass therethrough; a sound-receiving section including an acoustic medium having a smaller sound velocity than the air, wherein an acoustic signal propagates through the acoustic medium, the sound-receiving section being arranged so that the linearly-polarized light from the first polarizer passes through the acoustic medium and enters the second polarizer; and a photodetector for converting an intensity of light having passed through the second polarizer to an electric signal, wherein between the first polarizer and the second polarizer, the linearly-polarized light having passed through the first polarizer is given different phase shifts in two orthogonal directions which are each different from a polarization direction.
Owner:PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

Apparatus and method for evaluating performance of ultrasonic transducer

An apparatus for evaluating the performance of an ultrasonic transducer, comprises a transducer assembly which transmits / receives ultrasonic waves by having an ultrasonic transducer and an acoustic medium; a storage unit which stores a reference signal value indicative of the performance of the ultrasonic transducer; and a processing unit which emits the ultrasonic waves by controlling the transducer assembly, receives a response (echo) signal thereto, measures magnitude or energy amount of the response signal, and compares a measured value to the reference signal value stored in the storage unit, thereby evaluating the performance of the ultrasonic transducer.
Owner:IND UNIV COOP FOUND SOGANG UNIV

Machine housing component with acoustic media grille and method of attenuating machine noise

Air flow openings in a machine housing facilitate air exchange with a machine, but may become outlets for machine noise. In order to protect a machine from possibly damaging elements while facilitating air exchange and attenuating machine noise, the present disclosure includes a machine that is, at least, partially surrounded by a machine housing. An acoustic media grille is positioned adjacent to at least a portion of the machine housing. The acoustic media grille and the portion of the machine housing both define air flow openings that, at least partially, correspond with one another to form an at least partially unobstructed air flow path.
Owner:CATERPILLAR INC

Imaging method and device in visco-acoustic medium

The embodiment of the invention discloses an imaging method and device in a visco-acoustic medium. The method comprises the steps: carrying out the linearization of an original wave equation based onthe least square inversion theory via Born approximation according to to-be-imaged medium parameters; building an inverse migration operator corresponding to reverse time migration; building an objective function of least square migration under an inverted theoretical framework, and deducing an iterative inversion algorithm through an adjoint state method, thereby achieving the least square inverse migration of the visco-acoustic medium. During the inversion imaging of the seismic data of the visco-acoustic medium, the method effectively improves the imaging precision of a geologic body underthe complex medium conditions, reasonably eliminates the impact on the amplitude, frequency and phase from the stratum absorption, transmission and geometric diffusion, and achieves the amplitude-preserving, fidelity-preserving and higher-resolution imaging.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Optical microphone

ActiveUS9014565B2Highly resistant against ambient environment fluctuationsConfigure an optical microphoneMicrophonesOptical signal transducersAcoustic mediumPhotovoltaic detectors
An optical microphone includes: a light source; a first polarizer for allowing linearly-polarized light, of light output from the light source, to pass therethrough; a second polarizer for allowing linearly-polarized light having a different polarization plane from the first polarizer to pass therethrough; a sound-receiving section including an acoustic medium having a smaller sound velocity than the air, wherein an acoustic signal propagates through the acoustic medium, the sound-receiving section being arranged so that the linearly-polarized light from the first polarizer passes through the acoustic medium and enters the second polarizer; and a photodetector for converting an intensity of light having passed through the second polarizer to an electric signal, wherein between the first polarizer and the second polarizer, the linearly-polarized light having passed through the first polarizer is given different phase shifts in two orthogonal directions which are each different from a polarization direction.
Owner:PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

Method for photoetching piezoelectric film transducers on two sides of acoustic bulk wave

The invention relates to a method for photoetching piezoelectric film transducers on two sides of an acoustic bulk wave, which comprises the following steps: 1) manufacturing a two-side photoetching mask for a bottom electrode, a piezoelectric film for alignment and an upper electrode mask according to electrode patterns on each layer of the designed bottom electrode, piezoelectric film and upper electrode; 2) forming metal films for the bottom electrode at two ends of an acoustic transmission medium; 3) photoetching the bottom electrode patterns on two sides of the metal films of the bottom electrode; 4) sputtering the piezoelectric films at two ends of the acoustic transmission medium; 5) evaporating or sputtering the upper electrode films at two ends of the acoustic transmission medium; 6) manufacturing patterns of the piezoelectric film by alignment; and 7) manufacturing patterns of the upper electrode by alignment. The method solves the problems that a mechanism mask has small size and the pattern of the mask cannot be printed, and the manufactured patterns lack of standardization and have poor precision, and the like. Therefore, the precision of the mask and the consistency of the electrode patterns can reach micron dimension; the acoustic transmission medium has wider dimension range; and the aligned precision at two ends in the range from 2 to 90mm is high, and the alignment can be less than 5 microns.
Owner:CHINA ELECTRONICS TECH GRP NO 26 RES INST

Optical microphone

An optical microphone is provided with: a light source (4); a first polarizer (5) for passing the straight polarization light from among the light beams emitted from the light source (4); a second polarizer (8) having a polarization plane that is different from the first polarizer (5) and for passing the straight polarization light; a sound receiving unit (7) having an opening and an acoustic medium through which acoustic signals that entered from the opening are propagated and which has a slower sound velocity than air, the sound receiving unit (7) being disposed in a manner such that the straight polarization light that passed through the first polarizer passes through the acoustic medium by cutting across a path for propagating the acoustic signals and enters the second polarizer; and a light detector (9) for converting the intensity of light that passed through the second polarizer (8) into electric signals. A different phase shift is applied to the straight polarization light that passed through the first polarizer between the first polarizer and the second polarizer in two directions that intersect one another and that are different from the polarization direction.
Owner:PANASONIC CORP

Korotkoff's sound sensor

InactiveCN104434072AHigh sensitivityModerate frequency response rangeAngiographyElectricitySignal conditioning circuits
The invention discloses a Korotkoff's sound sensor. The Korotkoff's sound sensor comprises a sensor monitoring probe, wherein the sensor monitoring probe is positioned at an end of the Korotkoff's sound sensor and comprises a supporting base with a cavity structure in the middle; upward flanges are arranged at two ends of the supporting base; a step structure which is higher than a plane of the cavity structure is formed on the supporting base; a piezoelectric metal substrate is fixedly supported on the step structure; a stress acoustic medium transmitting unit is adhered to the upper surface of the metal substrate; a piezoelectric sensor is solidified on the lower surface of the metal substrate; signal processing circuits are arranged below the piezoelectric sensor and in the cavity structure at intervals; and each signal processing circuit is provided with an output end; and signals can be transmitted from the output ends of the signal processing circuits to an external Korotkoff's sound hematomanometer. The problem that the original Korotkoff's sound sensor is poor in anti-interference performance, low in sound intensity and not high in frequency resolution is solved.
Owner:BEIJING XINXING YANGSHENG TECHN CORP

Prestack depth reverse time migration imaging method and system of absorption attenuation medium

The invention provides a prestack depth reverse time migration imaging method of an absorption attenuation medium. The method comprises the steps of: step 1: giving initial values of L strain fittingparameters T sigma 1 within an effective frequency band range of seismic data; step 2: calculating an integral function value at the current calculation frequency based on the initial values of the Lstrain fitting parameters T sigma 1; step 3: obtaining a stress fitting parameter T corresponding to a current Q value according to a fitting parameter expression; step 4: in view of all Q value points in a Q value field data, repeating the step 1 to the step 3 to obtain a fitting parameter data body; step 5: obtaining a sticky acoustic medium wave field forward propagation operator and a sticky acoustic medium wave field reverse propagation operator, and performing forward modelling of a wave field according to the forward propagation operator and the reverse propagation operator to obtain ashot point forward propagation wave field and a detection point reverse propagation wave field; and step 6: performing imaging by using imaging conditions for the shot point forward propagation wave field and the detection point reverse propagation wave field of any moment. By adopting the prestack depth reverse time migration imaging method provided by the invention, the efficiency of prestack depth reverse time migration imaging is greatly improved under the condition of ensuring the imaging accuracy.
Owner:CHINA PETROLEUM & CHEM CORP +1
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