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Ultrasonic sensing of porous granular mediaThe existence of phenomena for sensing porosity and grain growth in powder metallurgical processes using ultrasonic techniques is demonstrated. Ultrasonic velocity is a strong function of pore concentration and provides a potential means for in situ measurement of this quantity. Ultrasonic attenuation, measured in the low megahertz range, depends on grain size and pore content. When velocity data and a scattering theory are used to account for the attenuation due to pores, attenuation data may be used to infer the grain size. Predictions of existing scattering theories are compared with experimental observations, and substantial disagreements are attributed to modeling inadequacies.
Document ID
19920046099
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Parthasarathi, Sanjai
(NASA Headquarters Washington, DC United States)
Lu, Yichi
(NASA Headquarters Washington, DC United States)
Wadley, Haydn N. G.
(Virginia, University Charlottesville, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Quality Assurance And Reliability
Meeting Information
Meeting: Annual Review of Progress in Quantitative Nondestructive Evaluation
Location: La Jolla, CA
Country: United States
Start Date: July 15, 1990
End Date: July 20, 1990
Accession Number
92A28723
Funding Number(s)
CONTRACT_GRANT: NAGW-1692
Distribution Limits
Public
Copyright
Other

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