Abstract: A method of non-contact micromanipulation using ultrasound includes disposing in a liquid medium in which micro particles are distributed, an ultrasound transducer comprising a transducer plate, a surface electrode wholly covering a first principal surface of the transducer plate and a reverse surface electrode on a second principal surface of the transducer plate comprising a plurality of short electrode strips arranged in parallel, and a reflector set in parallel opposition to the first principal surface of the transducer plate from which the reflector is spaced apart by a prescribed distance, applying a voltage to at least one electrode strip selected from the plurality of electrode strips to radiate ultrasound to form a standing wave field between the ultrasound transducer and the reflector to trap micro particles, and electrically switching the voltage being applied to the selected electrode strip to an adjacent electrode strip to move the standing wave field by moving a position of ultrasound radiated b

Abstract: A method of non-contact micromanipulation using ultrasound includes providing a concave ultrasound transducer in a liquid medium in which micro particles are distributed, positioning a reflector at the focal point position of the transducer and radiating ultrasound from the transducer to form a standing wave field between the transducer and the reflector to align and trap micro particles at half wavelength intervals along the axis of the transducer.

Abstract: A method of driving a fluid by transmitting ultrasonic waves in the fluid, in which electrical signals applied to a transducer in the fluid are controlled to change the amplitude and duty ratio of tone burst waves so as to control the distribution of the ultrasonic driving force in the fluid, and the driving force itself.

Abstract: A visualizing method for three dimensional standing wave sound field comprises the steps of mixing into a liquid medium a large number of fine particles of the same density as said liquid medium and exposing the liquid medium containing the fine aparticles to a three dimensional standing wave sound field produced by ultrasonic waves thus causing the fine particles to move to positions where the amplitude of the sound pressure is minimum, the sound pressure distribution of the three dimensional standing wave sound field being visualized by the distribution of the fine particles.

Abstract: A visualizing method for three dimensional standing wave sound field comprises the steps of mixing into a liquid medium a large number of fine particles of the same density as said liquid medium and exposing the liquid medium containing the fine particles to a three dimensional standing wave sound field produced by ultrasonic waves thus causing the fine particles to move to positions where the amplitude of the sound pressure is minimum, the sound pressure distribution of the three dimensional standing wave sound field being visualized by the distribution of the fine particles.