23 results about "Acoustic medium" patented technology

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.

This invention relates to the field of seismic imaging technology and discloses a method, apparatus, equipment, and medium for forward modeling of seismic acoustic waves in a viscoelastic-acoustic (VTI) medium. The method includes: obtaining a desired Q value; calculating the viscoelastic velocity of the seismic acoustic wave based on the desired Q value; fitting parameters of a generalized standard linear body model; constructing a wave equation for the seismic acoustic wave in the VTI medium based on the generalized standard linear body model; and solving the wave equation for the seismic acoustic wave in the VTI medium using the finite difference method and the viscoelastic velocity. This invention solves the problem that traditional seismic simulations cannot simultaneously consider seismic anisotropy and seismic attenuation, significantly improving the accuracy and applicability of seismic simulations, as well as the accuracy of seismic simulations in complex terrain, geology, and oil and gas reservoir areas. It provides a foundation for subsequent high-precision seismic velocity modeling and seismic migration imaging.

The application provides an ultrasonic field detection device and an ultrasonic emission detection system. The detection device comprises a container for containing a sound guide medium, an ultrasonic field detection unit, a rotating mechanism and a processing unit. The bottom of the container is provided with a mounting position. Each group of ultrasonic field detection units comprises a light emitting unit and a camera unit oppositely arranged on both sides of the container along an optical axis. The optical axis is orthogonal to the axis of the ultrasonic field generated by the ultrasonic generation unit. At least one group of ultrasonic field detection units is rotatable to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism. The light emitting unit is used for emitting detection light at the plurality of different stations. The camera unit is used for correspondingly collecting image information of the detection light deflected through the ultrasonic field at the different stations. The processing unit generates a three-dimensional image of the ultrasonic field based on the collected image information at the plurality of different stations. Thus, the ultrasonic field emitted by the ultrasonic emitter can be detected non-destructively.

Provided is a combined de-aliasing method of one-way wave equation modeling in a frequency-wavenumber domain. 1, nonphysical signal distortion or artificial noise resulting from a folding effect of Fourier transform and undersampling of Fourier transform and improper mathematical operations of numerical truncation or singular value generation from numerical calculation is eliminated in both of a frequency-wavenumber domain and a spatio-temporal domain; and a specific technical solution includes the following steps: step 1, eliminating singular-value aliasing; step 2, eliminating an artificial boundary noise; step 3, eliminating a Fourier folding effect; and step 4, outputting a correct one-way wave equation after eliminating the aliasing. The combined de-aliasing method of one-way wave equation modeling in a frequency-wavenumber domain involves a reasonable denoising technique, is especially aimed at a one-way wave equation modeling equation in an acoustic medium, and can be extended to elastic mediums and viscoelastic mediums.

The invention discloses a broadband sound body wave delay line device film layer structure and a preparation method thereof. The film layer structure comprises a sound transmission medium, an input thin film transducer and an output thin film transducer, wherein the input thin film transducer and the output thin film transducer are arranged at the two ends of the sound transmission medium respectively; each of the two thin film transducers comprises a bottom electrode, an AlScN piezoelectric thin film and an upper electrode which are sequentially arranged away from the sound transmission medium; the orientation of the AlScN piezoelectric film is C-axis orientation, and the full width at half maximum is 1-4; and the doping concentration of Sc in the AlScN piezoelectric film is 5 at%-25 at%. According to the film layer structure, the AlScN thin film is adopted as a piezoelectric material of the transducer, due to the high electromechanical coupling coefficient of the AlScN thin film, the bandwidth of the device can be effectively improved through the structure, and the application scene with the higher bandwidth requirement is met. In addition, by further controlling the orientation, the full width at half maximum and the Sc doping concentration of the AlScN thin film, the relative bandwidth can reach 98% or above, and wider signal processing capacity and anti-interference capacity are achieved.

In some cases, photoacoustic imaging techniques involve detecting photoacoustic signals through an ergodic relay, emitting time-reversed photoacoustic signals back through the ergodic relay to an acoustic medium where acoustic radiation pressure causes surface displacements, optically imaging the surface profile of the acoustic medium at different heights, and constructing a 3D image of the object based on the surface profile at different heights.

The present application relates to pericardiocentesis practice technical field, especially in an ultrasonic positioning guide pericardiocentesis practice model, including the ultrasonic wave can be penetrated bionic thoracic base;The heart simulation body is fixed in bionic thoracic base, and the heart simulation body is composed of simulated myocardial layer and the heart chamber placed in its inside and can be filled with liquid;The pericardial sac simulation body is wrapped outside the heart simulation body, and the pericardiocentesis simulation body includes an elastic wall layer film.The present application sets up effusion regulating device communicated with pericardial simulation cavity, and the filling amount of the sound transmission medium in pericardial simulation cavity can be infinitely adjusted by the push and pull of liquid storage injector, after the puncture needle completely breaks through pericardial sac simulation body, continue to needle to contact myocardial simulation film, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture is empty when the membrane is punctured, and the second puncture

The utility model belongs to the technical field of medical instruments, and discloses a treatment head and a treatment handpiece, the treatment head is used for being matched with a handle for use, the treatment head comprises a shell and a transducer module, the shell is provided with a containing cavity and a connecting port, the containing cavity is used for containing a sound conducting medium, and the transducer module is arranged in the containing cavity; the containing cavity is communicated with the connecting port, and the connecting port can be opened so that the handle can stretch into the containing cavity for heat dissipation. According to the invention, effective heat dissipation of the treatment head can be realized, and the heat dissipation efficiency of the treatment head is improved, so that the use safety of the treatment head is improved.

The application discloses a kind of for low frequency broadband high-efficiency sound absorption metamaterial unit and its superstructure module, and the metamaterial unit includes the metamaterial cavity enclosed by multiple blocks of wall and the acoustic waveguide channel being arranged in the metamaterial cavity, acoustic waveguide channel is provided with impedance high-efficiency modulation sound absorption body, impedance high-efficiency modulation sound absorption body includes high porosity sound absorption medium and impedance modulation channel.The introduction of impedance modulation channel can effectively change the acoustic characteristics of high porosity sound absorption medium, by changing the geometric configuration of impedance modulation channel, can be widely modulated acoustic impedance, while producing resonance absorption peak in low frequency band, so as to significantly improve the sound absorption performance in low frequency band.A plurality of metamaterial units with different low-frequency high-efficiency absorption performance are connected in parallel, and through the coupling effect between the metamaterial units, a metamaterial module with low-frequency broadband high-efficiency sound absorption and noise reduction performance can be formed, thereby realizing low-frequency broadband high-efficiency sound absorption performance.

The invention relates to the technical field of geological exploration in the petroleum industry, in particular to a viscous-acoustic medium angle gather extraction method based on self-adaptive wave beam reverse time migration. According to the method, the self-adaptive beam operator depending on local space velocity change is introduced to realize automatic focusing of the seismic beam, and the absorption attenuation effect caused by the viscosity is compensated through the viscous sound medium during complex value travel; slowness information of a shot point is extracted based on travel time information of a self-aggregation seismic beam, a reflection field angle at an imaging point position is further calculated, an imaging value is located at a correct position according to the range and interval of the reflection field angle, and direct extraction of a viscous sound medium angle gather is achieved. According to the method, the absorption attenuation effect caused by the viscosity of the medium can be effectively compensated, the high-quality angle gather can be output, the calculation efficiency and the calculation precision are both achieved, and powerful support is provided for migration velocity analysis and oil reservoir description work of the viscous medium.

This disclosure relates to an acoustic transducer array assembly including a printed circuit board having at least one plated through-hole and a matching layer containing an acoustic medium configured to provide acoustic impedance matching between at least one piezoelectric element and the acoustic impedance of a target sample, configured to provide acoustic pressure waves to at least one sample location. The acoustic transducer array assembly further comprises at least one acoustic transducer having at least one signal electrode electrically connected to at least one plated through-hole and acoustically coupled to the matching layer, at least one ground electrode electrically connected to at least one plated through-hole and acoustically coupled to the matching layer, and at least one piezoelectric element electrically connected to the at least one signal electrode and the at least one ground electrode.

The utility model discloses an ultrasonic treatment head and a treatment instrument, and relates to the technical field of ultrasonic treatment, the ultrasonic treatment head comprises a bottom shell, a cover body and a transducer, the bottom shell is provided with a sound transmission port; the cover body is connected with the bottom shell, a liquid containing cavity is defined by the cover body and the bottom shell, and the liquid containing cavity is filled with a sound conducting medium; the energy converter is mounted in the liquid containing cavity and is suitable for transmitting ultrasonic energy outwards through the sound transmission opening; wherein the cover body comprises a top wall provided with a liquid injection channel, the top wall comprises a first inner wall surface and at least one second inner wall surface, the distance from the first inner wall surface to the sound transmission opening is larger than the distance from the second inner wall surface to the sound transmission opening, and the liquid injection channel is located on the first inner wall surface. According to the technical scheme provided by the utility model, bubbles are not easy to remain in the liquid containing cavity filled with the sound conducting medium in the ultrasonic therapeutic apparatus when water is injected, and the normal conduction of ultrasonic waves is prevented from being influenced by the bubbles.

The application discloses a viscoacoustic medium characteristic wave and primary wave combined least square reverse time migration method and belongs to the technical field of oil geophysical exploration. The method constructs a new combined Q least square reverse time migration target function, introduces a viscoacoustic differential equation and an accompanied pseudo-differential equation, describes forward and reverse propagation wave fields of the combined Q least square reverse time migration, deduces Q compensation wave field propagation, Q compensation accompanied operators and Q attenuation migration operators of primary waves, multiple waves, diffracted waves and prism waves, constructs a new gradient formula, and realizes Q least square reverse time migration of combined multiple waves, diffracted waves, prism waves and primary waves in a viscoacoustic medium. The method can accurately image structures under salt, steeply inclined flanks, small faults and rock caves, obtain clearer complex structure information, obtain high-resolution and high-quality imaging diagrams, and solves the problem of unclear imaging of current special complex high-steep structures.

The application discloses a self-evolution underwater communication method and system for an underwater acoustic dynamic heterogeneous channel. A hyperbolic frequency modulation acoustic signal is used by a sending end underwater acoustic node to extract time domain multipath and frequency domain Doppler characteristics of an underwater acoustic medium, and a joint entropy value is constructed to initialize acoustic wave transmission waveform parameters. An error code rate is monitored by a receiving end, and an energy efficiency fitness function value is calculated by combining an underwater acoustic transducer and a physical layer total energy consumption to perform feedback. According to the function value change trend, a directional update rule is used by the sending end to perform joint iteration on a subcarrier spacing, a cyclic prefix and a pilot insertion density. When the channel is reliable but the energy efficiency decreases, a low energy consumption disturbance operation of reducing the pilot insertion density or shortening the cyclic prefix is forced to be performed to reduce the invalid acoustic wave radiation time of the transducer. Through entropy value decoupling and energy efficiency evaluation, the application solves the acoustic energy waste problem caused by excessive protection of a traditional communication method, and significantly prolongs the endurance of an underwater node.

The invention discloses a self-evolution underwater communication method and system for an underwater sound dynamic heterogeneous channel, and the method comprises the steps: extracting time domain multipath and frequency domain Doppler features of an underwater sound medium through a transmitting end underwater sound node through a hyperbolic frequency modulation acoustic signal, and constructing a joint entropy value to initialize a sound wave transmission waveform parameter; the receiving end monitors the bit error rate and calculates an energy efficiency fitness function value for feedback by combining the total energy consumption of the underwater acoustic transducer and the physical layer; the sending end performs joint iteration on the subcarrier interval, the cyclic prefix and the pilot frequency insertion density by utilizing a directional updating rule according to the change trend of the function value; when the channel is reliable but the energy efficiency is reduced, a low energy consumption perturbation operation of reducing the pilot insertion density or shortening the cyclic prefix is enforced to reduce the invalid sound wave radiation time of the transducer. According to the method, through entropy decoupling and energy efficiency evaluation, the problem of acoustic energy waste caused by excessive protection in traditional communication is solved, and the endurance of the underwater node is remarkably prolonged.

A method for acoustic environment reproduction in a motor vehicle is described, wherein at least one object is detected in an environment around the motor vehicle using at least one sensor, and a relative position of the object to the motor vehicle is determined, wherein an audio signal is generated depending on the relative position of the object to the motor vehicle, wherein the audio signal is a reproduction of an acoustic medium, wherein an object representation of the object in a position assigned to the relative position in a motor vehicle interior is simulated, and wherein an influence of the object representation at the assigned position on the spatial sound in the motor vehicle interior is simulated by modifying the audio signal.

The application discloses a mixed type ultrawideband sound absorption superstructure and a sound absorption module thereof, and relates to the field of acoustic noise reduction.The sound absorption superstructure comprises a resonance unit and a high-porosity sound absorption medium.The resonance unit comprises an outer shell, a rectangular channel and a cover plate.The cover plate is arranged in the outer shell, and divides the cavity in the outer shell into an upper space and a lower space.The rectangular channel is surrounded by two wall plates, the two wall plates are arranged in the lower space, and the top ends of the two wall plates are connected with the cover plate.The high-porosity sound absorption medium is filled in the upper space, the high-porosity sound absorption medium is provided with a sound wave guide channel, and the sound wave guide channel is coaxial with the rectangular channel.A through hole is arranged on the cover plate, so that the rectangular channel is connected with the high-porosity sound absorption medium.The application is applied to the field of acoustic noise reduction, and can overcome the defects of complex configuration, a large number of combined units, long development time, complex processing and installation, high cost and poor reliability of a traditional super material structure scheme for realizing low-frequency and ultrawideband high-efficiency sound absorption.

This invention provides a microchannel reactor, relating to the field of microreactor technology. It includes multiple sequentially connected reaction monomers, each reaction monomer comprising a reaction substrate, at least one temperature control unit, and a vibration unit. A containment cavity filled with an acoustic medium is formed inside the reaction substrate, and a channel is formed on at least one side of the reaction substrate. At least one temperature control unit respectively seals the channel to form a microchannel for the flow and reaction of the mixture. The temperature control unit is configured to contact the mixture within the microchannel for heat exchange to regulate the reaction temperature. The vibration unit is configured to extend into the acoustic medium and release sound waves to reduce solid buildup in the mixture within the microchannel.

The invention provides an ultrasonic treatment head and an ultrasonic treatment instrument, and relates to the field of ultrasonic equipment. The ultrasonic treatment head comprises a shell and a guide structure, the shell is filled with a sound conducting medium, and one end of the shell is provided with a water injection hole; the guide structure is installed on the inner circumferential wall of the shell and extends in the circumferential direction of the shell. The guide structure is used for blocking air between the guide structure and the inner wall, provided with the water injection hole, of the shell. The ultrasonic treatment head provided by the invention solves the technical problem in the prior art that the treatment is easy to lose efficacy or the equipment is easy to damage when the ultrasonic treatment head is used obliquely or inversely.

This invention discloses an efficient viscosonic wave attenuation compensation reverse-time migration method based on a weighted function approximation. The method includes: S1, introducing a weighted function approximation to derive a viscosonic wave attenuation equation applicable to finite difference solutions; S2, based on the viscosonic wave attenuation equation, establishing a viscosonic wave compensation equation to compensate for energy attenuation during seismic wave propagation in a viscous medium; S3, implementing an attenuation-compensated reverse-time migration imaging process, wherein the wavefield compensation term is combined with low-pass filtering calculations to achieve wavefield stability compensation; S4, configuring the source and receiver settings to perform reverse-time migration imaging. The method of this invention efficiently achieves wavefield stability compensation and attenuation-compensated reverse-time migration imaging, effectively improving the accuracy and resolution of seismic imaging in viscosonic media.

The invention provides a least square viscous-acoustic medium primary wave and multiple reverse time migration imaging method. The method comprises the following steps: inputting a speed model, a quality factor Q model, an actual shot record containing multiple and an observation system; calculating a full-wave-field forward modeling wave field according to the observation system and the actual shot record; according to the observation system and the shot record without the direct wave, calculating a reflected wave field propagated in the reverse direction and the reverse time; performing cross-correlation on the forward propagation wave field and the reverse time propagation reflection wave field to obtain a first iteration imaging result, obtaining full wave field simulation data by utilizing reverse migration, and solving a second iteration imaging result; recording a residual error between the second simulation data and the actual data; according to the residual error calculated for the second time, carrying out back propagation to obtain a first order gradient and an iteration step length; and outputting a final imaging result after meeting a convergence condition. The method can suppress crosstalk noise, improves the imaging precision of underground geological structures, especially complex structures, and has important research significance for exploration and development of oil and gas reservoirs.

Systems, methods, and mechanisms for a transducer probe for ultrasonic measurement and direct modulation, e.g., a transducer probe generating ultrasound across a broad range of frequencies to acoustically modulate groups of neurons. An ultrasonic probe can include an array of ultrasonic transducers, a substrate, and a tube. The array of ultrasonic transducers can be included on the substrate and the substrate can be positioned and / or included within an interior of the tube. In addition, a volume between the substrate and an interior wall of the tube can be filled with an acoustic substance configured to provide acoustic coupling between the substrate and the tube. The ultrasonic probe can be configured to radiate, via the array of ultrasonic transducers positioned within the acoustic medium, ultrasound through the acoustic medium.

The application discloses a kind of based on pretreatment iterative method's viscous medium scattering wave numerical simulation method, first in background wave number Small virtual component is introduced into, and then a L-S equation with complex wave number is obtained;Then, a pre-solution factor defined with the aid of the small virtual component is used to pretreat the L-S equation with complex wave number;Finally, the L-S equation after pretreatment is iteratively solved using iterative method, and the Born series improved by complex wave number and pretreatment is obtained;During the whole process, a small virtual component is introduced to improve the divergence problem of Born series in strong disturbance medium, and the calculation efficiency is further accelerated using the pre-solution factor;And in order to avoid solving large iterative matrix, the velocity model is divided into thin plates using the idea of thin plate division, so as to convert global calculation into local calculation, and through the above process, the seismic scattering wave record with high efficiency and good accuracy is finally extracted.