51 results about "Acoustic Fluid" patented technology

An acoustic fluid level sensor for use in a chamber contained in a surgical cassette. The sensor has an ultrasound transducer mounted on the outside of the bottom of a fluid chamber and is acoustically coupled to the chamber. The transducer sends a pulse ultrasound signal through the chamber and any liquid in the chamber. The signal is reflected back by the air/liquid interface and captured by the transducer. The time required for the signal to travel to and from the transducer will vary with the amount of fluid in the chamber and is indicative of the level of fluid in the chamber.

An aircraft ultrasonic fuel-gauging system has a processing unit that energizes probes and receives signals from transducers arising from energy reflected back from the fuel surface. In addition to determining the time between transmission of a signal from the transducer and reception of its reflection from the fuel surface, the processing unit also determines the time of reception of subsequent reflections caused by reflection back from the lower end of the probe. The processing unit determines whether the subsequent reflected signals are within predetermined limits of the time interval between transmission and reception of the first reflected signal in order to confirm the validity of the first signal. The processing unit also counts the number of subsequent reflected signals received within predetermined time intervals to assign a confidence level and this used to select between different incompatible signals, such as signals from that probe at different times or signals from different probes.

The embodiment of the invention discloses a device for generating acoustic fluid tweezers. The device comprises at least one bulk acoustic wave generating part, an acoustic wave reflection part, a bulk acoustic wave generating area, a bottom lining layer, at least one flow channel and a passivation layer, wherein the bulk acoustic wave generating part comprises a bottom electrode, a piezoelectriclayer and a top electrode which are arranged sequentially from bottom to top; the acoustic wave reflection part is contacted with one side of the bulk acoustic wave generating part; the superposed area of the bottom electrode, the piezoelectric layer, the top electrode and the acoustic wave reflection part form the bulk acoustic wave generating area; the bottom lining layer is used for supportingthe bulk acoustic wave generating part; a part of an area of a flow channel cavity of the flow channel covers an acoustic wave action area of the at least one bulk acoustic wave generating area; and the passivation layer covers a part which is on the piezoelectric layer and does not cover the top electrode. The acoustic fluid tweezers generated by the device can realize accurate operation on objects with molecule, nanoparticle and micrometer size.

In an acoustic resonator, an actuator allows a piston to reciprocate axially at very small amplitude at high speed. Owing to pressure fluctuation in the acoustic resonator involved by reciprocal motion of the piston, fluid is sucked into and discharged from the acoustic resonator via a valve device at the top end of the acoustic resonator. The acoustic resonator is covered with a gas guide with a space. The valve device is cooled by a fan at the top end of the gas guide.

An acoustic fluid machine such as an air compressor comprises an acoustic resonator, a valve device and a piston. Air is sucked into the resonator through the valve device at one end of the resonator. The piston at the other end of the resonator is reciprocated by an actuator to compress the air in the resonator to cause resonance to increase pressure of the air significantly. The inner surface of the resonator is suitably curved to comply with the formula of a half-period cosine function.

The invention discloses an acoustic fluid sensor. The acoustic fluid sensor comprises an acoustic sensing device, an experimental container, an ultrasonic transmitting device, an ultrasonic receivingdevice and a calculation and processing device; the acoustic transmitting device comprises a hollow cylindrical housing for holding a load fluid, and silicone tubes which are arranged at two ends of the hollow cylindrical housing and constitute a through cavity together with the hollow cylindrical housing; the ultrasonic transmitting device transmits ultrasonic waves into an ambient fluid, excitesthe load fluid in the hollow cylindrical housing to form Scholte-Stoneley circular waves; when the Scholte-Stoneley circular waves satisfy a phase matching condition, standing waves are formed aroundthe hollow cylindrical housing so as to generate a local sound field; and the calculation and processing device determines the quality factor of the acoustic fluid sensor based on normalized transmission spectrum data. The coupling degree of the local sound field generated by the acoustic fluid sensor of the invention and the load fluid is large, and the quality factor and sensitivity of the acoustic fluid sensor can be improved. The acoustic fluid sensor is suitable for the high-sensitivity sensing of a trace fluid.

In an acoustic fluid machine, an acoustic resonator gradually reduces in diameter towards the top on which a valve device is provided to suck a gas into the resonator. The gas is compressed in the resonator by a circular-plate piston at the lower end of the resonator and discharged via an outlet of the valve device. The piston comprises a rubber plate fixed to the resonator and a metal plate attached on the rubber plate.

The embodiment of the invention provides an acoustic fluid sensor. The acoustic fluid sensor comprises a slit double-plate acoustic device, an ultrasonic transmitting device, a computing processing device and an experimental vessel; the slit double-plate acoustic device comprises two parallel substrates which are spaced with a slit space which is used for containing to-be-detected fluid, and each substrate is provided with equally-spaced raised lines; the slit double-plate acoustic device is immersed in environmental fluid; the ultrasonic transmitting device transmits ultrasonic into the environmental fluid, the two substrates arranged in the slit double-plate acoustic device are stimulated to form non-leaky A0 mode Lamb waves and form a symmetric strong local mode through resonant coupling in the slit space, and the computing processing device determines parameters of the to-be-detected fluid by computing frequency points and amplitudes of resonant transmission enhancement peaks in an ultrasonic spectrum. According to the acoustic fluid sensor, only a trace amount of to-be-detected fluid is needed, high sensitivity and quality factors can be achieved, and the sensor is particularly sensitive to fluid opposite to density and acoustic velocity change trends.

An acoustic fluid machine includes an acoustic resonator, a valve device, a piston, and an actuator. The acoustic resonator has a larger-diameter base and a smaller-diameter upper end. The valve device is provided on the upper end of the acoustic resonator and has a sucking hole and a discharge hole. The piston is provided in the base of the acoustic resonator and has a surface such that the distance between the upper end of the acoustic resonator and the upper surface of the piston is substantially constant over the whole surface of the piston. The actuator is connected to the piston and reciprocates the piston at high speed axially with a very small amplitude so that a gas is sucked into the acoustic resonator via the sucking hole and discharged via the discharge hole by virtue of pressure fluctuations within the acoustic resonator.

An acoustic fluid machine has an acoustic resonator and a piston reciprocated by an actuator at the base of the acoustic resonator. A valve device is provided on the upper end of the acoustic resonator. External air is introduced into the acoustic resonator through the valve device. The piston has through-holes, through which front space communicates with rear space thereby reducing load applied onto the piston.

A method of facilitating biomolecular sensing includes: driving a resonator to generate a gigahertz (GHz) level acoustic fluid in a liquid; and driving biomolecules in a flow field to be transported to a sensing interface of a biosensor in the acoustic fluid action area through the GHz-level acoustic fluid. Also provided is a device for facilitating biomolecular sensing, comprising: an acoustic fluid system portion comprising a resonator for generating an acoustic fluid of GHz level; a cylindrical cavity, positioned in the acoustic fluid action area of the resonator and used for limiting the range of an acoustic fluid field and accommodating a sensing interface of the biomolecular sensor. Correspondingly, the invention also provides a biomolecular sensing system. By using the sensor, the biomolecular sensing function of the sensor can be promoted.

The invention discloses a single cell control system and method based on acoustic fluid tweezers, a monoclonal cell line construction method and a single cell droplet generation method. The single cell control system comprises a sample caching device, an ultrahigh-frequency bulk acoustic wave resonator, a multi-degree-of-freedom motion device and a PLC; the sample caching device is used for fixing and storing different types of samples; the ultrahigh-frequency bulk acoustic wave resonator is connected with the sample caching device through a liquid medium and acts on target cells in the sample caching device; the multi-degree-of-freedom motion device is mechanically connected with the ultrahigh-frequency bulk acoustic wave resonator and controls the ultrahigh-frequency bulk acoustic wave resonator to move; and the PLC is used for adjusting the spatial positions of the ultrahigh-frequency bulk acoustic wave resonator and the cells by controlling the multi-degree-of-freedom motion device and controlling the power and the frequency applied to the ultrahigh-frequency bulk acoustic wave resonator so as to realize stable stripping of adherent single cells and capture of suspension cells, controlling the multi-degree-of-freedom motion device so that the cells move along with the movement of the ultrahigh-frequency bulk acoustic wave resonator, and controlling the release of the captured single cells by controlling the on-off of the power applied to the ultrahigh-frequency bulk acoustic wave resonator.

The invention discloses an acoustic fluid micro pump based on a micro electro mechanical technology. The pump comprises a pump cavity with an inlet and an outlet; a GHz-level resonator is arranged in the pump cavity; and a pipeline which extends from the outlet to the resonator and is not in contact with the resonator is arranged. According to the pump, the GHz-level resonator and the non-contact pipeline over the resonator are arranged in the pump cavity, the power amplifier and the signal generator are externally connected, stable and rapid one-way acoustic jet can be obtained, and efficient and continuous pumping of liquid is achieved. The pump has the advantages of miniature size, simple structure, low power consumption, wide application, compatibility with a semiconductor process, portability through a wireless driving mode and the like.

The invention discloses a microorganism concentration and purification device. The device comprises an acoustic fluid device and an ultrasonic generation unit arranged on the acoustic fluid device; the acoustic fluid device is provided with a microfluidic cavity, a sample inlet and sample outlets, the sample outlets at least comprise the first sample output and the second sample outlet which are arranged in the up-down direction, and the sample inlet and the sample outlets are communicated with the microfluidic cavity; the ultrasonic generation unit is located between the sample inlet and thesample outlets and arranged at the upper side or the lower side of the microfluidic cavity for upwards generating an ultrasonic wave, the ultrasonic wave is a standing wave, through acoustic wave radiation force generated by the standing wave, microorganism samples which flow through the microfluidic cavity form layered microorganism streams, and different layers of microorganism samples flow outalong different sample outlets respectively. Through the ultrasonic standing wave generated by the ultrasonic generation unit, microorganisms are subjected to acoustic wave radiation force and purified, adhesion loss of the microorganisms is avoided, the recovery rate is increased, the samples are concentrated, and the cost is lowered.