NASA NTRS · 19820000355
Variable-Position Acoustic Levitation
Abstract
Method of acoustic levitation supports objects at positions other than acoustic nodes. Acoustic force is varied so it balances gravitational (or other) force, thereby maintaining object at any position within equilibrium range. Levitation method applicable to containerless processing. Such objects as table-tennis balls, hollow plastic spheres, and balsa-wood spheres levitated in laboratory by new method.
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Barmatz, M. B., Stoneburner, J. D., Jacobi, N., Wang, T. G.. 1983-05-01. Variable-Position Acoustic Levitation. https://ntrs.nasa.gov/citations/19820000355
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