94 results about "Acoustic levitation" patented technology

A gas sensor for sensing the presence of a gas includes an IR source, a microphone, a reference gas substantially similar to the gas to be detected, a reference body defining a reference chamber therein, the reference chamber having a pressure port coupled to the microphone, and a broad-band optical window through which at least IR wavelengths corresponding to absorption peaks of the predetermined gas may pass. The window is disposed between the IR source and reference chamber. The reference gas is contained within the reference chamber between the optical window and the microphone. The sensor can be included in a hand-held gas detection instrument having power supply, an outer shell, a circuit board assembly including sensor circuitry, a suction pump, actuation controls and status indicators. A probe defining a lumen therethrough supplies the sample gas.

A medical ultrasound device is disclosed. The device comprises an elongated body having a proximal end and a distal end region (1). One or more ultrasound transducers (4) for generating acoustic radiation are positioned in the distal end region, inside the elongated body. A transmission element (5) which is substantially transparent to acoustic radiation is positioned in the radiation path of the acoustic radiation, and a controller unit is operatively connected to the ultrasound transducer. The transmission element and the one or more ultrasound transducers are mounted so that an acoustic path length (8) between the transmission element (5) and the ultrasound transducer (4) varies with contact force (10) imposed to the distal end region. The controller unit detects the acoustic path length between the ultrasound transducer and the transmission element and determines the contact force from the detected acoustic path length. In an embodiment, the medical device is an ultrasound RF ablation catheter.

The invention discloses an acoustic levitation polishing machine of mechanically representing nano test samples and comprises a machine frame, a pulse power source, a holding fixture that is used for clamping a working piece to be processed, an ultrasonic energy transducer, a container that is used for storing polishing liquid, an ultrasonic reflecting end, and a tuning mechanism that is used for adjusting the distance between the ultrasonic reflecting end and the ultrasonic energy transducer. The ultrasonic energy transducer, the container and the tuning mechanism are all arranged above the machine frame, the pulse power source is connected with the ultrasonic energy transducer, the container is arranged under the ultrasonic energy transducer, the holding fixture is arranged above the container and is connected with a belt wheel actuating mechanism, and the ultrasonic reflecting end is arranged under the container, coordinated with the ultrasonic energy transducer and connected with the tuning mechanism. The invention provides an acoustic levitation polishing machine of the mechanically representing nano test samples with good applicability and well polishing effect.

Systems and method for acoustic detection using flow sensors are provided. One system includes a flow conduit configured to allow fluid flow therethrough and a flow disrupter configured to impart a flow disturbance to the fluid flow. The system also includes at least one of a first sensor or a second sensor. The first sensor is disposed within the flow conduit at a first position, wherein the first sensor is responsive to first disturbances and configured to generate signals characteristic of the first disturbances. The second sensor is disposed within the flow conduit at a second position, wherein the second sensor is responsive to second disturbances and configured to generate signals characteristic of the second disturbances. The system additionally includes a processor operably coupled to the first and second sensors, wherein the processor is configured to distinguish between signals characteristic of the first and second disturbances.

The invention provides a multiple physical environment controllable acoustic levitation experiment apparatus. A support base seat and a transparent pressure resistance cover are connected to form an enclosed cavity; an electric elevating platform is mounted on the support base seat, a sound reflecting end on the electric elevating platform is driven via an electric motor to move up and down, an energy transducer is fixed on the support base seat via support rods, and a supersonic generator is connected with the energy transducer; that one of a step-shaped amplitude transforming rod, a conicalamplitude transforming rod and an exponential type amplitude transforming rod shares the same axis with an output end of the energy transducer can be guaranteed via a lower end of the energy transducer via movement of a converter; a sound emitting end of the amplitude transforming rod is right opposite to the sound reflecting end; a humidifier, a heating pipe, an air pressure gauge, a temperaturesensor and a humidity sensor are mounted in the cavity; the cavity is also provided with a vent hole communicated with the outside or a gas transmission device. Via the multiple physical environment controllable acoustic levitation experiment apparatus, requirements for different physical experiments can be met, and different types of amplitude transforming rods can be chosen at will according todifferent samples to be levitated.

The invention discloses a digitization method for a railway vehicle bearing acoustic detection system and an implementation device for the digitization method, and belongs to the technical field of train security monitoring. A master control system, a data collection system, a wheel sensor, a startup sensor, a digital microphone array and a network device are arranged in a rail edge protection cabinet for processing train signals, obtaining vehicle passing data and uploading the data to a vehicle depot data center through a high-speed network in forms of specific messages. By means of the digitization method and the implementation device, vehicle bearing sounds are collected directly through digital microphones, the vehicle bearing sounds and other signals are directly processed in the rail edge protection cabinet, all field data are digitized, signal noise caused when analog signals are transmitted in a long-line manner is avoided, the signal quality is high, and the anti-interference capacity is high; the digitization data are directly transmitted to a central server through a high-speed network channel, and cable line resources are saved.

The invention relates to a disc micro-engine gyroscope based on the sound suspension in the field of micro motor technique. The invention comprises: eight capacitance plates, a partition electrode, a electricity plate, a base plate, a insulating layer, four bracing columns and a micro rotors, wherein the base plate and the partition electrode are positioned on two sides of the electricity plate along with the sickness direction; the insulating layer is positioned on the base plate; the eight capacitance plates are positioned on the insulating layer evenly, which forms four bracing columns on the insulating layer; the micro rotor is positioned on the four bracing columns.

The invention discloses an acoustic detection and blind signal separation-based air tightness monitoring method and apparatus. The objective of the invention is to solve the problems of inconvenient wire leading due to high air pressure, incapability of positioning gas leakage positions and incapability of identifying multiple-point gas leakage in the application of air tightness monitoring and detection of equipment of compressors and gas tanks. According to the acoustic detection and blind signal separation-based air tightness monitoring method of the invention, a plurality of high-sensitivity acoustic sensors are bonded at different positions of a detected container through utilizing a turbulent flow sounding effect in a gas leakage process; acoustic signals are conditioned and amplified; after being acquired by a microprocessor, the conditioned and amplified acoustic signals are subjected to blind signal separation processing; recognition of multiple-point gas leakage and gas leakage position positioning are performed through waveform comparison and signal intensity comparison; light flashing and tweeting are adopted to perform warning; and signal waveforms, gas leakage positions and the number of gas leakage points are displayed on an LCD screen. The acoustic detection and blind signal separation-based air tightness monitoring method and apparatus of the invention can be used for long-term gas leakage online monitoring of equipment such as pipelines and containers, and can be also used for air tightness quality detection of products. The acoustic detection and blind signal separation-based air tightness monitoring method and apparatus have the advantages of high accuracy, convenient operation and low price.

The application discloses a detection method and system for shear-wave velocity of acoustic radiation. The detection method comprises following steps: respectively selecting an impact position, a first detection position and a second detection position and impacting acoustic radiation force of the impact position; respectively accumulating two groups of time-depth-shear wave displacement matrixes along the depth direction in order to obtain two groups of accumulative displacement arrays formed by accumulation and composition; respectively searching maximum value of the two groups of accumulative displacement arrays and utilizing maximum value as shear-wave crest position time; and calculating shear-wave velocity according to the distance between the first detection position and the second detection position and shear-wave crest position time of the first detection position and the second detection position. The detection method and system for shear-wave velocity of acoustic radiation have following beneficial effects: without searching for focal positions of the displacement matrixes, the displacement matrixes are firstly accumulated along the depth direction and information on shear-wave crest in different depths is comprehensively utilized so that the time position where most shear-wave crests pass through is found out and the horizontal position where the maximum value is located is obtained, therefore calculating shear-wave velocity.

The invention relates to a device and a method for the acoustic examination of objects (20, 30, 40) in the environment of a means of conveyance (10). The method comprises the steps of: - detecting sound emitted by an object (20, 30, 40) in the environment by means of a sensor (1, 2, 3, 4), - evaluating the sensor signal over time, and - recognising a position and/or a relative movement (P) and/or a spatial extent of the object (20, 30, 40) in the environment on the basis of a comparison of a time profile (5) of an intensity variable of the sensor signal with a predefined reference (6).

The invention discloses an acoustic levitation system based on an ultrasonic array and a control method of the acoustic levitation system. The acoustic levitation system comprises an upper computer, acontroller, FPGA modules, a driving circuit and a single-sided ultrasonic sensor array. An object is levitated up by calculating a phase of the ultrasonic array and generating a specific sound fieldabove the single-sided ultrasonic sensor array. Compared with the conventional ultrasonic standing wave levitation, the defects of the ultrasonic standing wave levitation at present are overcome; reflection components are not needed; hardware equipment of acoustic levitation is greatly simplified; the levitated object does not need to be surrounded by acoustic components; the object can be levitated in an open space; the maneuverability is also greatly improved; the sound field formed by the array type levitation is capable of easily completing movement along a specific trajectory, so that theconfinement of standing wave nodes is avoided; the application scenes of an acoustic levitation technology are extended; in addition, the acoustic levitation system is simple in overall structure andeasy to implement, is suitable for being extensively popularized and applied, and is especially applicable to processing and transportation of non-contact type materials and biological experiments, and the like.

The invention relates to the technical field of nanometer particle preparation, in particular to a gold nanometer particle and a method for preparing the gold nanometer particle with acoustic levitation. The method for preparing the gold nanometer particle with the acoustic suspension comprises the following steps that (1) acoustic suspension is conducted on a mixed solution of HAuCl4.3H2O and polyvinylpyrrolidone, so that suspension liquid is obtained; and (2) under the acoustic suspension conditions in the step (1), a NaBH4 solution is added into the suspension liquid for a reduction reaction, and then suspending gold nanometer particles are obtained, wherein during acoustic suspension, the ultrasonic power of an acoustic suspension instrument is 250-450 W, the ultrasonic frequency is 20-22 KHz, and the distance between the reflection end and the transmitting end is 35-50 mm. Under the specific acoustic suspension conditions, the NaBH4 solution is adopted to conduct reduction on a HAuCl4.3H2O solution, the prepared gold nanometer particles are remarkably higher in catalytic performance than the gold nanometer particles prepared by the adoption of a conventional method.

The invention relates to the technical field of nanoparticle preparation, in particular to a method for preparing ruthenium nanoparticles without a container. The method comprises the following stepsof (1) performing acoustic suspension on a mixed solution of RuCl3.3H2O and polyvinylpyrrolidone to obtain a suspension; and (2) under the acoustic suspension condition of the step (1), adding a NaBH4solution into the suspension, and carrying out a reduction reaction to obtain suspended ruthenium nanoparticles, wherein during the acoustic suspension, the ultrasonic power of an acoustic suspensioninstrument is 250 to 450W, the ultrasonic frequency is 20 to 22KHz, and the distance between a reflecting end and an emitting end is 15 to 30mm. According to the method, the ruthenium nanoparticles are prepared by reducing the RuCl3.3H2O solution with the NaBH4 solution in a stable suspension state in a container-free environment provided by an acoustic suspension technology, so that the preparation process is simple, and the prepared ruthenium nanoparticles are relatively small in particle size and narrow in particle size distribution.

The invention discloses a multi-sound field interfered acoustic levitation device and a sound filed switching method. The device comprises a microcontroller, a driving motor module, a power module, acontroller, an upper shell, a lower shell, a connection part and a plurality of ultrasonic wave emission areas. The upper shell and the lower shell are opposite and are set in parallel. The upper shell and the lower shell are connected by the connection part. The upper shell and the lower shell are spaced to form a levitation space. The plurality of ultrasonic wave emission areas are set on the upper shell and the lower shell and are distributed according to an array. Each ultrasonic wave emission area comprises a plurality of ultrasonic wave emitters. The controller outputs a signal to the microcontroller. The microcontroller receives the signal and outputs a square wave signal to the driving motor module. The driving motor module drives the plurality of ultrasonic wave emission areas towork. An initial phase of each ultrasonic wave emission area is further adjusted through change of the signal output by the controller, and curl of a sound field is adjusted.

An acoustic detection system for detecting at least partly submerged targets in a sensitive area defined with respect to an infrastructure, wherein the system includes at least one multistatic detection group, each multistatic detection group defining a detection area, and comprising: a submerged transmitter transmitting at low frequencies; a plurality of submerged receivers comprising at least two receivers, each receiver of a given group forming, with the transmitter of the group, a bistatic pair, each bistatic pair generating an elementary detection area surrounding a blind zone, the detection area of the group being formed by all of the elementary detection areas of the receivers of the group, the blind zone of each receiver in a given detection group being at least partly covered by the elementary detection areas of the neighbouring receivers of the detection system.

The invention provides an acoustic levitation device in a liquid environment. The acoustic levitation device comprises a waveguide circular tube, a hydrophone, a transducer used for transmitting acoustic waves, a signal generator and an oscilloscope; the waveguide circular tube is in a shape of a cylindrical bucket with an opening in one end, the opening is sealed through a steel plate, and the waveguide circular tube is filled with a liquid medium; the transducer is arranged at the bottom of the waveguide circular tube, the piston type transducer is adopted and is connected with the signal generator outside the waveguide circular tube, and the hydrophone is suspended in the liquid medium and is connected with the oscilloscope outside the waveguide circular tube. An acoustic levitation method comprises the following steps that (1) a sound field in air is established; (2) a sound field in the liquid environment is calculated; (3) a weight threshold is measured; (4) according to an existing frequency, the corresponding waveguide circular tube is designed and organic glass is adopted as the side wall, the bottom end of the waveguide circular tube is provided with the transducer, the top end of the waveguide circular tube adopts a round face rigid reflection end made from steel, the height of an intermediate medium, such as water, reaches the optimum size of the waveguide circulartube through simulation calculation.