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Propagation of sound through the Earth's atmosphere. 1: Measurement of sound absorption in the air. 2: Measurement of ground impedanceThe fabrication of parts for the acoustic ground impedance meter was completed, and the instrument tested. Acoustic ground impedance meter, automatic data processing system, cooling system for the resonant tube, and final results of sound absorption in N2-H2O gas mixtures at elevated temperatures are described.
Document ID
19810009322
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Becher, J. (Old Dominion Univ. Norfolk, VA, United States)
Meredith, R. W. (Old Dominion Univ. Norfolk, VA, United States)
Zuckerwar, A. J. (Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1981
Subject Category
Acoustics
Report/Patent Number
NASA-CR-163958
PTR-81-4
Report Number: NASA-CR-163958
Report Number: PTR-81-4
Accession Number
81N17845
Funding Number(s)
CONTRACT_GRANT: NAG1-15
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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