Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 47, Issue 5, Pages 4336-4338Publisher
JAPAN SOCIETY APPLIED PHYSICS
DOI: 10.1143/JJAP.47.4336
Keywords
ultrasound; acoustic radiation pressure; standing-wave field; noncontact manipulation; levitation; Rayleigh's formula
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A noncontact manipulation technique is necessary in micromachine technology. Using a standing-wave field generated between a transducer and a reflector, it is possible to trap particles at nodes of a sound pressure field. In the present paper, a sound filed has been studied by both experimental measurement and numerical caluclation. The sound pressure distribution of a standing-wave field was measured using a small microphone and calculated numerically using Rayleigh's formula. Although Rayleigh's formula is usually used to calculated direct sound pressure from a sound source, it has been shown that the sound pressure of the standing-wave field can be calculated by Rayleigh's formula by addding multiply reflected waves. [DOI: 10.1143/JJAP.47.4336]
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