NASA NTRS · 19750000232
Levitation of objects using acoustic energy
Abstract
Activated sound source establishes standing-wave pattern in gap between source and acoustic reflector. Solid or liquid material introduced in region will move to one of the low pressure areas produced at antinodes and remain suspended as long as acoustic signal is present.
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Whymark, R. R.. 1975-10-01. Levitation of objects using acoustic energy. https://ntrs.nasa.gov/citations/19750000232
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