In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 105, No. 2_Supplement ( 1999-02-01), p. 1017-1017
Abstract:
A novel sound-field generation method for noncontact manipulation of particles has been studied experimentally. Although it was possible to trap particles in water at nodes of a standing wave field generated between a transducer and a reflector and to transport them using a frequency-shifting operation, there were several problems, such as unstable force due to resonance of the sound field and different movement of trapped particles. The present paper describes a method to generate a standing wave field using plural sound sources without a reflector. When two transducers were settled with their sound-beam axes crossing to each other, a standing wave field was generated in the crossing region. Changing the mutual phase of transmitting signals between the transducers, the sound field was shifted laterally, keeping the same form. When polystyrene particles were poured with a pipette into the sound field, they were trapped at the nodes of the sound-pressure distribution and were transported stably. Using three transducers whose sound-beam axes were crossed at an angle of 120° to each other in a plane, a standing wave field was generated with a hexagonal node pattern, and two-dimensional manipulation of a particle was accomplished.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1999
detail.hit.zdb_id:
1461063-2
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