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Improved formula for continuous-wave measurements of ultrasonic phase velocityAn improved formula for continuous-wave ultrasonic phase velocity measurements using contact transducers is derived from the transmission line theory. The effect of transducer-sample coupling bonds is considered for measurements of solid samples even though it is often neglected because of the difficulty of accurately determining the bond thickness. Computer models show that the present formula is more accurate than previous expressions. Laboratory measurements using contacting transducers with the present formula are compared to measurements using noncontacting (hence effectively correction-free) capacitive transducers. The results of the experiments verify the validity and accuracy of the new formula.
Document ID
19820030241
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chern, E. J.
(NASA Langley Research Center Hampton; College of William and Mary, Williamsburg, VA, United States)
Cantrell, J. H., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Heyman, J. S.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1981
Publication Information
Publication: Journal of Applied Physics
Volume: 52
Subject Category
Instrumentation And Photography
Accession Number
82A13776
Distribution Limits
Public
Copyright
Other

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