178 results about "Acoustic radiation" patented technology

A device and method for assembling objects by generating an axial acoustic radiation force in order to position the objects on pressure nodes and / or antinodes and generating a transverse acoustic radiation force in order to move the thus positioned objects on a porous membrane contact structure.

A rear panel, which is an external member, includes a frame portion including multiple sound radiation holes including a first sound radiation hole, a second sound radiation hole, and a third sound radiation hole. A first sloping portion is disposed within an area of the first sound radiation hole and is inclined with respect to a thickness direction of the frame portion towards a first direction non-parallel to the thickness direction, and a second sloping portion is disposed within an area of the second sound radiation hole and is inclined with respect to the thickness direction of the frame portion towards a second direction different from the first direction and non-parallel to the thickness direction, and the third sound radiation hole includes a surface parallel to the thickness direction of the frame portion.

The invention discloses a woodworking machine tool noise sound power level measurement method based on a sound intensity method, and belongs to the technical field of machine tool noise measurement, and the method specifically comprises the steps: determining a housing surface covered by a tool rotation plane projection as a main sound radiation region, and determining a main bearing pedestal installation surface as an infrasound radiation region; sound pressure, vibration acceleration signals and dynamic air pressure signals of a main sound radiation area are collected; resampling a dynamic air pressure signal rotation angle domain, extracting a reference pneumatic pulsating waveform synchronous with tool tooth sweeping, and establishing an airflow induced sound pressure model according to the reference pneumatic pulsating waveform and a phase relation; calculating a surface normal vibration speed according to the vibration acceleration, and establishing a structure radiation sound pressure model in combination with a sound wave equation; decomposing the sound pressure signal to obtain two types of component estimation values, and performing parameter optimization to obtain net sound intensity of a main sound radiation area; extracting vibration frequency band energy of an infrasound radiation area, calculating equivalent sound intensity by combining a sound radiation efficiency model, and outputting a total sound power level by space integration; the invention provides an effective method for accurately measuring and controlling the noise of the woodworking machine tool.

The invention discloses a sound barrier-based viaduct noise radiation prediction method and device and a medium, and relates to the technical field of noise radiation prediction, and the method comprises the steps: obtaining noise source data, and carrying out the noise feature extraction of a noise source state of the noise source data, so as to obtain a noise source feature matrix; obtaining dynamic environment data, and performing environment key parameter analysis on the dynamic environment data to determine environment parameters; based on the noise source feature matrix and the environmental parameters, a noise radiation path is obtained through mixed sound ray tracking; according to the noise radiation path, initial arrangement data of the sound barrier are determined through sound barrier interception configuration; and carrying out sound barrier interception optimization on the initial arrangement data of the sound barrier to obtain a multi-source sound barrier configuration strategy. According to the method, the technical problem that noise radiation prediction in a viaduct environment cannot meet sound barrier arrangement is solved.

The invention provides a rapid magneto-acoustic-electric tomography method without mechanical rotation and scanning. In order to solve the problems of low speed, poor stability, low imaging precision and the like of rotary scanning measurement in the existing magnetoacoustic-electric tomography (MAET), a magnetoacoustic-electric measurement theory suitable for annular sound source excitation and electrode detection is provided on the basis of sound radiation and a magnetoacoustic-electric coupling mechanism. An MAET imaging method based on annular multi-sound-source cyclic excitation and multi-electrode synchronous measurement is developed. The minimum configuration requirement of the MAET system is obtained based on the influence of the annular sound source, the number of electrodes and the positions of the electrodes on the imaging quality, and an optimal configuration scheme of rapid MAET imaging is provided. According to the invention, mechanical scanning without a transducer or phased scanning measurement of an array sound source is utilized, mechanical rotation of an object is not needed, sound source circulation excitation and multi-electrode synchronous measurement are realized through electronic control, and the imaging speed and stability are improved. The device is easy to be fused with a commercial ultrasonic CT system, and cross-scale multi-modal imaging combining ultrasonic and electrical impedance is realized.

The invention provides an underwater vehicle stern shell structure noise reduction method, and relates to the technical field of underwater vehicle noise reduction, and the method comprises the steps: obtaining the structure data of an underwater vehicle and a vibration signal in the operation process; determining a noise reduction target for the underwater vehicle according to the vibration signal; obtaining constraint conditions for the underwater vehicle; analyzing stern flow field characteristics and horseshoe vortex formation of the underwater vehicle on the basis of fluid dynamics analogue simulation; the method comprises the following steps: arranging a transition part of the underwater vehicle, vortex eliminating rectiblocks and reinforcing ribs; simulating vibration sound radiation of the underwater vehicle under fluid excitation by applying a finite element method in combination with sound-structure interaction analysis; optimizing the size of the transition part and the mounting position of the vortex elimination rectifying piece, and further optimizing the design parameters and the mounting position of the reinforcing rib by using a genetic algorithm; and outputting the target setting position of the reinforcing rib when the vibration sound radiation reaches the noise reduction target. According to the invention, systematic noise reduction analysis of the underwater vehicle structure can be realized.

The invention relates to the technical field of terminal equipment, and discloses a loudspeaker and electronic equipment. The loudspeaker comprises a frame, a magnetic circuit system and a vibration system, the magnetic circuit system and the vibration system are connected with the frame, and the magnetic circuit system is fixed at one end of the frame. The vibration system comprises a vibrating diaphragm, a dome and a voice coil. One end of the vibrating diaphragm is fixed at the other end of the basin frame, and the vibrating diaphragm protrudes towards the direction of the basin frame; the globe roof comprises a first globe roof and a second globe roof, the first globe roof is located on the side, away from the basin stand, of the vibrating diaphragm, the second globe roof is annularly arranged on the first surface of the first globe roof, and the second globe roof is connected with the other end of the vibrating diaphragm; the voice coil is fixed on the first surface of the first dome and is opposite to the magnetic circuit system; the voice coil is configured to generate a magnetic field effect with the magnetic circuit system to drive the first dome to vibrate and produce sound. Therefore, the dome is divided into two parts, and the diaphragm is used for transversely supporting the dome, so that the shape of the dome can be maximized, the area of the first dome can be increased, the effective sound radiation area of the loudspeaker can be increased, and the loudness of the loudspeaker can be increased.

The invention belongs to the technical field of automatic control, and particularly relates to a large-span ellipsoidal glass structure space noise reduction method based on sound field optimization, and the method comprises the steps: 1, transmitting a sample noise in an ellipsoidal glass structure through a sound wave generator, building a sound wave propagation model to describe the behavior of the sample noise in the ellipsoidal structure, an incident sound field is obtained; 2, analyzing the propagation characteristics of the sample noise in the ellipsoidal glass structure to obtain an acoustic structure coupling equation, and solving the acoustic structure coupling equation to obtain structural vibration displacement; 3, obtaining a sound radiation field of the ellipsoidal glass structure according to the structural vibration displacement; and step 4, combining the incident sound field and the sound radiation field, and performing spatial noise reduction by reflecting the sound pressure of the sound field. According to the method, the problems of poor adaptability and low control precision of a traditional noise reduction method in a non-uniform structure are effectively solved, and the noise reduction efficiency, the control sensitivity and the environment adaptability of a building space are remarkably improved.

The invention discloses an automatic radiation noise simulation method, device and equipment of acoustic finite element software and a storage medium, and relates to the technical field of noise simulation, and the method comprises the steps: obtaining a grid size and a convex hull grid distance according to a geometric model, a material and a frequency input by a user; performing mesh generation on the surface of the geometric model based on the mesh size to obtain a surface mesh; obtaining a convex hull grid based on the convex hull grid distance and the surface grid; generating a tetrahedral mesh in an area between the surface mesh and the convex hull mesh; based on the surface grid, the tetrahedral grid and the convex hull grid, acoustic radiation noise simulation is carried out, full-process autonomous generation from simulation input to grid calculation is realized, and the efficiency problem of grid division and boundary setting depending on artificial experience in the prior art is solved. The calculation precision is guaranteed, meanwhile, the pretreatment workload is reduced to the degree that only basic parameters need to be input, and the operation complexity of radiation noise simulation conducted by acoustic finite element software is reduced.

Various examples are provided related to methods and systems to reconstruct 3D image / map for the stiffness of soft tissues. In one example, a method includes obtaining particle velocities from generated mechanical waves in tissue of a subject; reconstructing a stiffness map of soft tissue in a region of interest (ROI) from the particle velocities; and generating an image of the stiffness map for rendering on a user device. In another example, a system includes an ultrasound scanner for shear wave elastography (SWE) and a computing or processing device that can obtain particle velocities; reconstruct a stiffness map of soft tissue in a ROI from the particle velocities; and generate an image of the stiffness map for rendering. The particle velocities can be generated from acoustic radiation forces produced by the ultrasound scanner.

The invention discloses an acoustic processing method for directionally generating, grouping and managing sound frequency bands and eliminating and counteracting the sound frequency bands, which comprises the following steps of: S1, carrying out AD (Analog to Digital) sampling on analog sound signals to be processed to obtain digital sound signals to be processed; s2, performing dynamic frequency band division on the to-be-processed digital sound signal to obtain a plurality of frequency band signals; s3, mapping the plurality of frequency band signals into a plurality of sound source groups; s4, each sound source group generates a directive sound signal pointing to the target area by using the sound radiation unit of the sound source group, and after the directive sound signal is synchronously transmitted to the target area, an actual mixed sound signal is formed; and S5, detecting, eliminating and counteracting a sound wave counteracting effect generated by the actual mixed sound signal in the target area. According to the method, high-quality accurate directional propagation can be realized, and the adaptability to a complex environment is enhanced.

The invention provides an ultrasonic transducer and ultrasonic cleaning equipment, the ultrasonic transducer comprises a piezoelectric exciter and a vibration radiant panel, the vibration radiant panel is fixed on the piezoelectric exciter, a power supply is electrically connected with the piezoelectric exciter, so that the piezoelectric exciter can generate longitudinal vibration, and the longitudinal vibration of the piezoelectric exciter can excite bending vibration of the vibration radiant panel. The longitudinal vibration sandwich type piezoelectric ultrasonic transducer solves the defects that an existing longitudinal vibration sandwich type piezoelectric ultrasonic transducer is small in radiation area, weak in longitudinal displacement amplitude, long in longitudinal size and the like to a great extent, and has the advantages of being small in space needed by operation, large in sound radiation area and sound radiation power, small in size and the like. The ultrasonic transducer can be widely applied to the application requirements of miniaturization and thinning of the installation space of the ultrasonic transducer. Meanwhile, the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer can be influenced by the length, and / or the width and / or the thickness of the vibration radiant panel, so that the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer is further improved through the size of the vibration radiant panel.

A method for specifying desired quantities of the energy flux of the combined waves of acoustic radiation pressure to apply producing a mid-air haptic pushing force, which has the effect of simultaneously reducing the harmonic distortion present is described. Further, a method for communicating only the summaries of acoustic field contributions at the required locations in the form of summed portions of the relatively small matrix whose row and column count depend only on the control point count is described. Further, phased arrays of ultrasonic speakers can produce a relatively large amount of acoustic energy which is usually directed in a specific direction or focused to a particular point depending on the application of the array. Further, to allow the system to be driven more strongly than usual, the complex-valued linear system that governs the drive signal to each control point is solved twice. Further, to achieve mid-air haptics with high precision the radiation pressure generated must be modelled accurately.

The invention relates to a measurement and inversion reconstruction method for a helicopter rotor sound radiation ball in an acoustic wind tunnel, and relates to the technical field of helicopter aeroacoustics wind tunnel test technology and sound target characteristics, and the method comprises the steps: measuring the noise radiated by a helicopter rotor in the acoustic wind tunnel through a hemispherical far-field noise measurement device; noise signals of the rotor in different directions are obtained, and a rotor sound radiation ball model is constructed; based on a sound propagation theory in a flow field, constructing a propagation model from the surface of the sound radiation ball model to the position of a microphone, and based on the influence of background noise, establishing a sound propagation equation from the surface of the sound radiation ball model to the microphone in the hemispherical far-field noise measurement device; and converting the sound propagation equation into solving a least square problem, solving to obtain sound source distribution on the surface of the sound radiation ball model, and reconstructing noise at any position of the far field of the helicopter rotor. The method can be suitable for reconstructing the helicopter rotor sound radiation ball in complex environments such as acoustic wind tunnels and high background noise, and practical research and application are carried out.

This invention relates to the field of dynamic load section stress monitoring and feedforward adaptive intelligent correction technology for coal conveyor belts in thermal power plants. The invention provides an automatic monitoring and correction device for coal conveyor belts, comprising: a control host that extracts speckle decorrelation index and maps the transverse segregation gradient matrix through a data acquisition and detection module; a rheological state analysis module that introduces a fractional-order calculus dynamics model to analyze the creep stress field and outputs a deformation potential energy time series; a spatial feature prediction module that uses the Koopman operator to elevate the nonlinear system to a linear functional space, identifies outbreak nodes by tracking eigenvalue drift trajectories, and issues early warning commands; and an acoustic field adhesion breaking correction module that drives piezoelectric ceramic elements to construct a local acoustic radiation standing wave field, breaking van der Waals forces to release transverse shear potential energy. This invention solves the risk of belt misalignment and tearing caused by material segregation and adhesion under multi-coal blending conditions.

The present description relates to a printing nozzle (20) for a 3D printer comprising a duct (21) that has an opening (23), wherein the duct (21) contains a fluid material to be printed (30) which forms an interface (31) with the air at the opening (23), wherein the printing nozzle further comprises an electro-acoustic transducer (40) configured to generate and send first ultrasonic waves (50) through the fluid material to be printed (30) to the interface (31), resulting in the formation of a droplet (32) of the fluid material to be printed at the interface (31) as a result of acoustic radiation forces.

Focused acoustic radiation, referred to as tonebursts, are applied to a volume of liquid to generate a set of droplets. In one embodiment, a first toneburst is applied to temporarily raise a mound or protuberance on a free surface of the fluid. After the mound has reached a certain state, at least two additional toneburst can be applied to the protuberance to sequentially eject multiple bursts of multiple droplets. In one embodiment, the state of the mound can be maintained by a sustained acoustic signal, during which time multiple additional tonebursts can be applied to sequentially eject multiple bursts of multiple droplets from the mound.

The invention discloses a real-time intelligent ship underwater radiation noise forecasting method based on virtual and real data fusion. The method comprises the following steps: establishing an acoustic elasticity calculation model of a real ship; defining an excitation point, and randomly applying a group of normal frequency sweeping forces with different amplitudes; solving and calculating vibration sound radiation; respectively reading a vibration acceleration amplitude spectrum of a measuring point corresponding to each excitation point; reading a radiation noise result of the whole ship, and outputting the radiation noise result to a file sound source level-working condition; calculating results under different working conditions until the calculated working condition number is equal to the set working condition number M; forming a model training set by the output acceleration amplitude spectrums and the radiation noise sound source level results of the M working conditions; a sample number, a side point number and a frequency point number for BP neural network training are defined, a result of a training set is read, data are processed, and input and output matrixes for BP neural network training are generated; parameters of BP neural network training are defined, and real-time intelligent forecasting of the underwater radiation noise of the ship based on virtual and real data fusion is achieved.

The application claims a MEMS frequency accurate tracking and locking method based on a resonant phase-locked loop (R-PLL). The application relates to the technical field of MEMS (micro-electro-mechanical system) resonator control and frequency tracking, and the method takes the output of a voltage-controlled oscillator as an interference signal, takes the physical response (such as weak electromagnetic leakage or acoustic radiation) of a disturbed MEMS device as a feedback signal, compares the phase difference between the feedback signal and a reference signal through a phase detector, adjusts the interference frequency, and forms a closed-loop locking system. The application adjusts the interference source frequency through a phase detector and a filter, can track the target resonant frequency drift caused by factors such as temperature change in real time, makes the MEMS resonator keep in a phase-locked state with the target resonant frequency, and ensures that the interference energy is always efficiently coupled.

Provided is a decontamination device capable of confirming whether a mist circulation dispersion unit is working properly before and after decontamination operation or during decontamination and capable of ensuring the operation of the decontamination device. The decontamination device is provided with a mist supply unit, a mist circulation dispersion unit, and an ultrasonic wave detection unit. The mist supply unit changes a decontamination liquid used for decontaminating the inside of a work chamber into a decontamination mist and supplies the decontamination mist to the inside of the work chamber. The mist circulation dispersion unit makes a vibration plate provided with a plurality of ultrasonic wave transmitters vibrate ultrasonically to generate an ultrasonic wave-based acoustic flow from the surface of the plate to the vertical direction, and makes a pressing action based on acoustic radiation pressure of the acoustic flow act on the decontamination mist to make the decontamination mist circulate and disperse in the work chamber. The ultrasonic wave detection unit is provided with an ultrasonic wave receiver for detecting the operation of the ultrasonic wave transmitters, and detects the operation of the plurality of ultrasonic wave transmitters as a whole and / or each ultrasonic wave transmitter provided in the vibration plate.

This invention discloses a method for measuring the sound power level of woodworking machine tool noise based on the sound intensity method, belonging to the field of machine tool noise measurement technology. Specifically, it includes: determining the housing surface covered by the projection of the tool's rotation plane as the main sound radiation area, and the main bearing seat mounting surface as the secondary sound radiation area; acquiring sound pressure, vibration acceleration signals, and dynamic air pressure signals in the main sound radiation area; resampling the dynamic air pressure signal in the rotational angular domain, extracting the reference air pulse waveform synchronized with the tool tooth sweep, and establishing an airflow-induced sound pressure model based on this and the phase relationship; calculating the surface normal vibration velocity based on the vibration acceleration, and establishing a structural radiation sound pressure model based on the sound wave equation; decomposing the sound pressure signal to obtain estimates of two types of components, and obtaining the net sound intensity of the main sound radiation area after parameter optimization; extracting the vibration frequency band energy of the secondary sound radiation area, calculating the equivalent sound intensity based on the sound radiation efficiency model, and spatially integrating to output the total sound power level. This invention provides an effective method for the accurate measurement and control of woodworking machine tool noise.

This invention relates to a method for rapid three-dimensional acoustoelastic prediction and line spectrum identification of ship mechanical noise based on online equipment vibration monitoring. The method includes: establishing a refined three-dimensional acoustoelastic calculation model for the overall ship vibration and acoustic radiation calculation of the equipment-vibration isolator-base-shell; applying a unit sweep force at the equipment's center of gravity node to obtain the transfer function from the average vibration acceleration spectrum of each equipment's base surface to the radiated noise; multiplying the average vibration acceleration spectrum monitored online in real time with the transfer function to obtain the ship mechanical noise under real-time excitation of each equipment; performing incoherent superposition of the radiated noise from each equipment to achieve rapid three-dimensional acoustoelastic prediction of ship mechanical noise; extracting the line spectrum peak value, and determining the main source of the line spectrum peak value by calculating the energy contribution of each equipment to the line spectrum peak value. This method achieves high-precision online prediction and automatic identification of the line spectrum source of ship mechanical noise, with high computational efficiency and strong engineering applicability.

This application relates to the field of centrifugal pump fault diagnosis technology, specifically to a method and apparatus for centrifugal pump fault diagnosis based on acoustic radiation signal processing. The method involves acquiring the acoustic radiation signal of a centrifugal pump to obtain a test acoustic radiation signal; performing wavelet packet decomposition on the test acoustic radiation signal; processing the sub-frequency band information in different ways to obtain a reconstructed signal; extracting various features from the reconstructed signal; combining the features to obtain a dataset; inputting the dataset into a pre-trained centrifugal pump fault diagnosis model; and outputting the centrifugal pump acoustic radiation signal fault diagnosis result. This application utilizes a combination of wavelet packet decomposition and singular value decomposition for acoustic radiation signal feature extraction, effectively improving the accuracy and efficiency of centrifugal pump acoustic radiation signal fault identification. It can accurately identify centrifugal pump fault types even under strong background noise interference, which is significant for risk warning of centrifugal pump faults.

The invention relates to a rocket takeoff jet flow noise prediction method and system containing multistage water spraying, and belongs to the technical field of aerospace transportation systems.The takeoff jet flow is dispersed into a series of independent point sound sources, sound power and sound radiation characteristics of the point sound sources are established respectively, meanwhile, a control volume is delimited in a jet flow water spraying area, and the control volume is calculated; the jet flow parameter ratio before and after water spraying is calculated, the sound power and radiation characteristics of the point sound source after water spraying are obtained through calculation, and then takeoff jet flow noise after water spraying is obtained; according to the method, takeoff jet noise prediction under different water spraying parameters can be realized, and reference is provided for noise environment design and water spraying scheme design; according to the rocket takeoff jet flow sound source distribution and the rocket takeoff water spraying position, the deflection jet flow noise radiation characteristic and the effective water spraying rate are obtained, the total sound pressure level precision at the takeoff noise peak moment is predicted to be superior to 3dB, the prediction precision of the peak frequency band of the 1 / 3 octave spectrum at the peak moment is predicted to be superior to 3dB, and the method has important engineering application and popularization value.

The utility model discloses a sectional material vibration attenuation structure based on particle damping and a rail train, the sectional material vibration attenuation structure comprises a chassis sectional material of a train body, a plurality of particle dampers are arranged on the upper surface and / or the lower surface of the chassis sectional material, each particle damper comprises a shell and damping particles filled in the shell, and the damping particles are arranged on the upper surface and / or the lower surface of the chassis sectional material. Acoustic radiation energy and / or vibration energy is consumed by the impact and friction between the damping particles. According to the utility model, the full-band vibration magnitude can be effectively reduced, the full-band sound insulation index is improved, the comfort level of passengers in the vehicle is improved, the influence of temperature is avoided, the original structure of the vehicle body is not changed, and the installation is convenient.

The present application relates to a kind of acoustic wind tunnel inside helicopter rotor sound radiation sphere measurement and inversion reconstruction method, it is related to helicopter aerodynamic acoustics wind tunnel test technology and acoustic target characteristic technical field, include: in acoustic wind tunnel using hemispherical far-field noise measuring device measurement helicopter rotor radiated noise, obtain the noise signal of different azimuth of rotor and construct rotor sound radiation sphere model;Based on the sound propagation theory in flow field, construct the propagation model of the surface of sound radiation sphere model to microphone position, and based on the influence of background noise, establish the sound propagation equation of the surface of sound radiation sphere model to microphone in hemispherical far-field noise measuring device;Sound propagation equation is converted to solve least square problem, and the sound source distribution of the surface of sound radiation sphere model is obtained, and the noise of helicopter rotor far field arbitrary position is reconstructed.Can be applied to in acoustic wind tunnel, high background noise and other complex environments reconstruct helicopter rotor sound radiation sphere, carry out practical research and application.

The invention provides a method for analyzing a high-frequency aerodynamic noise field in a closed space, which comprises the following steps of: 1) based on a CAD (Computer Aided Design) model, carrying out computational domain cutting and grid division on a flow field outside the model, dividing the flow field into a sound source area and a noise radiation area, and carrying out local grid encryption on the sound source area to ensure the subsequent turbulence resolution; 2) solving a flow field by adopting a DDES method, and capturing near-field sound source pulsation; 3, the generalized Green function analysis form in the limited space is introduced into an FW-H equation for integration, and far-field noise considering wall and ground boundary reflection is output. The concept is reasonable, the prediction accuracy, comparable with APE, in the tunnel can be obtained, and a new feasible way is provided for rapid evaluation and optimization of high-speed train tunnel acoustic performance.

The embodiment of the present application relates to a kind of dual-frequency high-power liquid processing ultrasonic transducer, comprising: one end of amplitude transformer is connected with sandwich transducer to form longitudinal displacement output structure;Metallic pipe is provided with mounting hole in side surface, mounting hole is connected with amplitude transformer by connecting piece arranged in the conical end of amplitude transformer, both ends of metallic pipe are provided with concave flexure shell;The half-wave mode and full-wave mode of longitudinal displacement output structure make the radial vibration and axial vibration of metallic pipe, form the complex frequency operating mode of ultrasonic transducer.The embodiment of the present application excites the radial vibration and longitudinal vibration of metallic pipe by the half-wave and full-wave mode of longitudinal displacement output structure respectively, realizes the dual-frequency operating mode of ultrasonic transducer;Concave flexure shell amplifies the radial vibration displacement of metallic pipe in phase, increases the acoustic radiation area of metallic pipe axial vibration, improves the acoustic radiation power of ultrasonic transducer and the uniformity of transducer radiation sound field.

A decontamination device capable of confirming accurate operations of a mist circulation dispersion means before and after or during a decontamination operation and guaranteeing the overall operation as a decontamination device.The device includes a mist supply means, a mist circulation dispersion means, and an ultrasonic detection means. The mist supply means converts a chemical for decontamination of the inside of a working chamber of the device into a mist for decontamination and supplies such mist to the inside of the working chamber. The mist circulation dispersion means subjects a vibrating board (which includes a plurality of ultrasonic transmitters) to ultrasonic vibration to generate sound flows with ultrasound from board surfaces in the vertical direction and presses the mist with acoustic radiation pressure of the sound flows in order to circulate and disperse the mist for decontamination in the working chamber. The ultrasonic detection means includes an ultrasonic receiver configured to detect the operation of the plurality of ultrasonic transmitters included in the vibrating board in as a whole and / or the operation of each of the constituent ultrasonic transmitters.

The invention relates to an acoustic radiation detector (4) for high-energy radiation, comprising a solid absorption layer (12) and a detector assembly (13) which is acoustically coupled to the absorption layer (12), wherein - the absorption layer (12) is designed, with respect to the material and thickness thereof, such that at least 50% of the particle radiation or electromagnetic radiation of the specified radiation energy is absorbed, and - the detector assembly (13) comprises a plurality of acoustic sensors (14) which are arranged in a matrix over a surface and are designed to measure sound waves emerging from the absorption layer (12). The invention also relates to an imaging medical system.