Three-dimensional Mid-air Acoustic Manipulation by Ultrasonic Phased Arrays

postado em: Arquivo, Blog, Referências | 0

*uma contribuição de Pedro Bittencourt

Authors and Affiliations

Yoichi Ochiai*1, Takayuki Hoshi*2 , and Jun Rekimoto*1,3 1 The University of Tokyo, Graduate School of Interdisciplinary Information Studies

7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan 2 Nagoya Institute of Technology

Gokisocho, Showa-ku,Nagoyashi, Aichi-ken, 466-8555 Japan 3 Sony CSL

3-14-13 Higashigotanda, Shinagawa-ku Tokyo 141-0022 Japan


The essence of levitation technology is the countervailing of gravity. It is known that an ultrasound standing wave is capable of suspending small particles at its sound pressure nodes. The acoustic axis of the ultrasound beam in conventional studies was parallel to the gravitational force, and the levitated objects were manipulated along the fixed axis (i.e. one-dimensionally) by controlling the phases or frequencies of bolted Langevin-type transducers. In the present study, we considered extended acoustic manipulation whereby millimetre-sized particles were levitated and moved three- dimensionally by localised ultrasonic standing waves, which were generated by ultrasonic phased arrays. Our manipulation system has two original features. One is the direction of the ultrasound beam, which is arbitrary because the force acting toward its centre is also utilised. The other is the manipulation principle by which a localised standing wave is generated at an arbitrary position and moved three-dimensionally by opposed and ultrasonic phased arrays. We experimentally confirmed that expanded-polystyrene particles of 0.6 mm and 2 mm in diameter could be manipulated by our proposed method.

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