31 results about "Acoustic radiation pressure" patented technology

The present invention comprises methods and systems that use acoustic radiation pressure.

The cantilever of a probe-based metrology instrument such as an AFM is deflected by directing a beam of ultrasonic energy at the cantilever to apply ultrasonically generated acoustic radiation pressure to the cantilever. The energy is generated by an ultrasonic actuator such as a ZnO transducer driven by a power source such an RF signal generator. The transmitted beam preferably is shaped by focusing, collimation, or the like so that it impinges at least primarily on a region of interest of the cantilever such as the free end. The ultrasonic actuator produces a much better controlled force on the cantilever than can be achieved through the use of a traditional piezoelectric actuator and, accordingly, produces a response free of spurious effects (at least when the cantilever is operating in liquid). It also has a frequency bandwidth in the MHz range.

In accordance with one aspect of the present invention, a cantilever of a probe-based instrument is deflected by directing a beam of ultrasonic acoustic energy at the cantilever to apply acoustic radiation pressure to the cantilever. The energy is generated by an acoustic actuator. The transmitted beam preferably is focused using a cylindrical lens, providing a beam tightly focused in one dimension and unfocused in a second dimension. In accordance with another aspect of the present invention, a power source such as an RF signal generator is operated so as to spread the spectrum of acoustic radiation on a time scale that is short or comparable to the acoustic roundtrip time. Such a design diminishing the resonance effects and sensitivity to spacing between the cantilever and the acoustic source.

The invention provides a novel ultrasonic standing wave fire extinguishing system. The system mainly comprises an ultrasonic wave emission end, an ultrasonic wave reflection end, a power amplifier anda control power supply. According to the system, ultrasonic waves are generated through vibration of piezoelectric ceramics at the emission end due to high-frequency signals generated by the controlpower supply, and the reflected ultrasonic waves and incident ultrasonic waves are superposed for forming standing waves. The ultrasonic frequency is controlled to be near the inherent frequency of the system, so that acoustic radiation pressure of the maximum power is achieved. Air in the ultrasonic standing wave range is limited within a small range, and can not flow randomly; meanwhile, ultrasonic standing wave environment further has a certain cooling function, so that flame in the ultrasonic standing wave range can be extinguished quickly; compared with other fire extinguishing schemes, the standing wave fire extinguishing system has the advantages that spraying of water or other fire extinguishing materials is not required, and meanwhile the system can be enabled continuously. The whole system is simple in structure, and especially suitable for specific fire protection of some fixed high-risk circuit interfaces or sophisticated instruments and equipment.

Provided is a continuous decontamination device which uses a decontamination agent such as hydrogen peroxide, which has been widely used in recent years, without using a high-priced electron accelerator, and is capable of achieving of treatment in a short amount of time while achieving a uniform decontamination level at each section and thereby is capable of batch treatment of articles to be decontaminated. The continuous decontamination device is provided with a device body that has a decontamination region and an aeration region, a conveyance means that conveys an article, a mist supply means, a mist control means, and an aeration means. The mist supply means converts the decontamination agent into a decontamination agent mist and supplies the same into the decontamination region. The mist control means is provided with a vibration board disposed in the vicinity of an inner wall of the decontamination region and causes the vibration board to ultrasonically vibrate to generate an acoustic flow formed by ultrasonic waves in a perpendicular direction from the board face. By causing a pressing force from the acoustic radiation pressure to act on the decontamination agent mist supplied into the decontamination region, the decontamination agent mist is concentrated on the outer surface of the article that is conveyed inside the decontamination region by the conveyance means.

The invention discloses an ultrasonic assisting high-sensitivity detection system for pollutants in fluid and a working method of the ultrasonic assisting high-sensitivity detection system. The ultrasonic assisting high-sensitivity detection system comprises an ultrasonic transducer. The ultrasonic transducer is provided with electrodes, an acoustic radiation plate is fixedly arranged on the surface of the ultrasonic transducer, a reflection plate is arranged below the acoustic radiation plate, a radiation layer is formed between the acoustic radiation plate and the reflection plate, and a sensor is arranged at the radiation layer and connected with a computer through a signal processing conversion device. A laser irradiation device and a transmission light receiving device are symmetrically arranged on the left side and the right side outside the radiation layer, and a scattered light receiving device is arranged in the front of the radiation layer or on the back of the radiation layer. The laser irradiation device, the transmission light receiving device and the scattered light receiving device are connected with a control and information processing system. The system utilizes acoustic flow, acoustic radiation pressure and acoustic vibration produced by resonance of the ultrasonic transducer and can not damage components of the pollutants, the detection precision of the sensor and a laser fine particle detection device can be improved exponentially, cost is greatly reduced, and the detection precision is greatly improved.

The invention provides a hybrid suspension disc non-contact ultrasonic motor, the motor system consists of a motor stator base (1), a piezoelectric ceramic (7), a motor rotor base (2), a rotating shaft (5), a radial bearing stator (4), radial bearing rotor (6), axial bearing stator base (10), electromagnetic coil (11), displacement sensor (12), axial bearing rotor base (13), support (3), screw ( 8) and countersunk screw (9) constitute. The radial bearing is composed of a permanent magnetic ring to achieve radial passive stable suspension through permanent magnetic force. The axial bearing controls the electromagnetic force to achieve axial active stable suspension by adjusting the current of the electromagnetic coil. The motor rotor is driven by the acoustic radiation pressure and the acoustic viscous force. Acoustic levitation and high-speed rotation are realized. The motor has the advantages of high speed, no mechanical friction, no lubrication, simple structure, and easy adjustment of the gap between the stator and the rotor.

A flow cytometer includes a capillary having a sample channel; at least one vibration producing transducer coupled to the capillary, the at least one vibration producing transducer being configured to produce an acoustic signal inducing acoustic radiation pressure within the sample channel to acoustically concentrate particles flowing within a fluid sample stream in the sample channel; and an interrogation source having a violet laser and a blue laser, the violet and blue lasers being configured to interact with at least some of the acoustically concentrated particles to produce an output signal.

Provided is a pass box with which it is possible: to achieve a perfect decontamination effect by converging decontamination mist on the surface of an article that is to be brought into a grade A environment; and to make a decontamination operation more efficient by shortening the amount of time required for aeration. This pass box comprises: a first chamber for decontaminating the outer surface of an article with a decontamination agent; a second chamber for removing the decontamination agent remaining on the outer surface of the decontaminated article; a decontamination agent feed device; a decontamination agent control device; a moving device for moving the article; and an air supply and exhaust device for supplying and exhausting cleaned air. The decontamination agent feed device transforms a decontamination chemical into decontamination mist, and feeds said mist into the first chamber where the article is accommodated. The decontamination agent control device is equipped with a trembling board disposed in the vicinity of an internal wall surface of the first chamber, causes the trembling board to oscillate ultrasonically so as to generate ultrasonic acoustic streaming in a perpendicular direction from a surface of the board, and causes a pressing force of acoustic radiation pressure to act on the fed decontamination mist, whereby the mist is caused to converge and act on the outer surface of the article.

The invention discloses an ultrasonic conveying device. The ultrasonic conveying device comprises an ultrasonic generation device, a vibrating plate and an adsorption mechanism, wherein the vibrating plate comprises a first surface and a second surface which are arranged oppositely; the ultrasonic generation device is arranged to be close to the first surface; a conveyed object is arranged on the second surface; the ultrasonic generation device is used for emitting ultrasonic waves; the ultrasonic waves are continuously emitted between the vibrating plate and the conveyed object to generate acoustic radiation pressure for lifting the conveyed object, and the conveyed object and the second surface are made to be separated; the adsorption mechanism is arranged close to at least one side of the vibrating plate or arranged opposite to the second surface, and the adsorption mechanism is used for adsorbing and driving the conveyed object to move in the conveying direction. In this way, it is ensured that the conveyed object does not directly make contact with the conveying device, and the conveying device is prevented from being polluted or scratched.