30 results about "Acoustic radiation pressure" patented technology

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.

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.

A particle control method is provided which can prevent an extremely small quantity of particles descending on a stream of a laminar flow in a clean zone through which the laminar flow flows as in a RABS or isolator device from descending to a specific position or can guide it so as to descend to the specific position by controlling movement of the particles. A particle descent position is separated away from a board surface of the oscillation board by using an acoustic radiation pressure generated by prompting ultrasonic vibration of the oscillation board disposed with a board surface substantially in parallel with a flow direction of the laminar flow.

A device according to an embodiment includes an optical system employing the OCT, and tomographically visualizes the viscoelasticity of tissue of an object. The device includes an optical mechanism that guides light from a light source to the tissue of the object to scan the tissue, a loading device that applies deformation energy to the tissue, a control computation unit that computes tomographic distribution of the viscoelasticity of the tissue by controlling driving of the loading device and the optical mechanism and processing an optical interference signal from the optical system on the basis of the driving, and a display device that displays the viscoelasticity of the tissue in a form of tomographic visualization. The loading device is a non-contact loading device that loads acoustic radiation pressure in the tissue by outputting ultrasonic waves toward a focus point set in the object.

A hydrogen peroxide mist supplied to a chamber to be purified is further refined and dispersed/diffused, and a perfect purification effect is achieved by supplying an appropriate amount of hydrogen peroxide mist to the chamber to be purified, and the efficiency of purification work is achieved by shortening the working time of ventilation and the like. A purification system is provided with a mist generation means, a mist discharge port, and a mist dispersion/diffusion means. The mist generating unit generates mist for purification by atomizing the purification liquid. The mist discharge port opens at the upper part of the inner side wall surface of the chamber to be purified and discharges purification mist into the chamber to be purified. The mist dispersing/diffusing means generates an acoustic flow by ultrasonic waves in the vertical direction from a disk surface of a vibrating disk disposed in the vicinity of the lower part of a mist discharge port in the inner side wall surface of the chamber to be purified or in the vicinity of the lower part of the side wall surface in the mist discharge direction, and intermittently operates or weakly operates a pressing force generated by acoustic radiation pressure on the purification mist from the rear or the side surface.

The invention discloses an expired gas on-line detection device which is composed of a sample extraction part and a detection part, the sample extraction part comprises a sound wave suspension device which is provided with a sound wave emission plate and a sound wave reflection plate which are horizontally arranged, and a suspension center with balanced sound radiation pressure and liquid drop gravity is arranged between the sound wave emission plate and the sound wave reflection plate; the exhaled air injection pipe is provided with an input end for exhaling of a person to be detected and an output end opposite to the suspension center; the extraction liquid injection needle is used for injecting the extraction liquid into the sound wave suspension device drop by drop, so that the extraction liquid drops suspend in the suspension center; the electrospray injector is used for spraying electrospray to enable the extraction liquid drops to be electrified; and the extraction transmitter comprises electrode plates arranged on the two sides of the suspension center and is used for crushing the electrified extraction liquid drops and enabling the electrified extraction liquid drops to enter the detection part. The invention further discloses an expired gas online detection method using the detection device, integration of rapid, online and efficient extraction and enrichment and real-time detection of the target object in the expired gas can be achieved, and development of expired gas detection work is greatly facilitated.

The invention provides a hybrid suspension type disc non-contact ultrasonic motor. The motor system is composed of a motor stator base body (1), piezoelectric ceramics (7), a motor rotor base body (2), a rotating shaft (5), a radial bearing stator (4), a radial bearing rotor (6), an axial bearing stator base body (10), an electromagnetic coil (11), a displacement sensor (12), an axial bearing rotor base body (13), a supporting seat (3), screws (8) and countersunk screws (9); radial passive stable suspension of a radial bearing is realized through the permanent magnetic circular rings and by means of permanent magnetic forces; the current of the electromagnetic coil is adjusted, so that permanent magnetic forces can be controlled, and therefore, the axial active stable suspension of an axial bearing is realized; and acoustic suspension and high-speed rotation of protestation of a motor stator can be realized under the driving effects of acoustic radiation pressure and an acoustic viscous force. The motor has the advantages of high speed, no mechanical friction, no need for lubrication, simple structure, easiness in stator and rotor clearance adjustment, and the like.

An ultrasonic tonometer for measuring the eye pressure of an examinee's eye by means of an ultrasonic wave includes an ultrasonic actuator having an ultrasonic element and configured to irradiate the examinee's eye with the ultrasonic wave, and current adjustment means configured to adjust a current applied to the ultrasonic element to control the sound pressure or acoustic radiation pressure of the ultrasonic wave. With this configuration, the ultrasonic tonometer solving at least one of typical problems can be provided. For example, the ultrasonic tonometer capable of properly irradiating the examinee's eye with the ultrasonic wave can be provided.