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Controlling Sample Rotation in Acoustic LevitationRotation of acoustically levitated object stopped or controlled according to phase-shift monitoring and control concept. Principle applies to square-cross-section levitation chamber with two perpendicular acoustic drivers operating at same frequency. Phase difference between X and Y acoustic excitation measured at one corner by measuring variation of acoustic amplitude sensed by microphone. Phase of driver adjusted to value that produces no rotation or controlled rotation of levitated object.
Document ID
19850000277
Document Type
Other - NASA Tech Brief
Authors
Barmatz, M. B. (Caltech)
Stoneburner, J. D. (Caltech)
Date Acquired
August 12, 2013
Publication Date
October 1, 1985
Publication Information
Publication: NASA Tech Briefs
Volume: 9
Issue: 2
ISSN: 0145-319X
Subject Category
FABRICATION TECHNOLOGY
Report/Patent Number
NPO-15962
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.