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Acoustic levitation methods for density measurementsThe capability of ultrasonic levitators operating in air to perform density measurements has been demonstrated. The remote determination of the density of ordinary liquids as well as low density solid metals can be carried out using levitated samples with size on the order of a few millimeters and at a frequency of 20 kHz. Two basic methods may be used. The first one is derived from a previously known technique developed for acoustic levitation in liquid media, and is based on the static equilibrium position of levitated samples in the earth's gravitational field. The second approach relies on the dynamic interaction between a levitated sample and the acoustic field. The first technique appears more accurate (1 percent uncertainty), but the latter method is directly applicable to a near gravity-free environment such as that found in space.
Document ID
19870040061
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Trinh, E. H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hsu, C. J. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1986
Publication Information
Publication: Acoustical Society of America, Journal
Volume: 80
ISSN: 0001-4966
Subject Category
ACOUSTICS
Distribution Limits
Public
Copyright
Other