多電極振動子を用いた音場制御による非接触マイクロマニピュレーション

概要

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Noncontact manipulation of micro obiects has been studied experimentally using radiation force of ultrasound. In a standing wave field generated between a transducer and a reflector in water, it was possible to trap small objects at nodes of sound pressure distribution. A multi-electrode transducer used in the present experiment was a rectangle 20×40 mm in size with fifteen electrodes of 20×2 mm. A series of electrodes on the transducer was driven by a continuous sinusoidal signal of 2.1 MHz and alumina particles were trapped at the nodes of sound pressure in a standing wave fleld. They were transported laterally by changing the driving electrodes sequentially. The resolu tion in moving distance of particles is determined by the electrode interval. Then, a method to control the sound field with high resolution was studied. When the phase difference between the electrodes was altered, the peak of sound pressure observed by means of the schlieren technique moved smoothly and the particles were also transported smoothly in the lateral direction.
一般社団法人日本機械学会の論文
1999-09-25