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Propagation of sound through the Earth's atmosphereThe infrasonic signatures generated by the main blade slap rate of a helicoper were used in an effort to detect infrasound generated by clear air turbulence. The artificially produced infrasound and the response of the data acquisition system used are analyzed. Flight procedures used by the pilot are described and the helicopter flight information is tabulated. Graphs show the relative frequency amplitudes obtained at various microphone locations.
Document ID
19830006769
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Badavi, F. (Old Dominion Univ. Norfolk, VA, United States)
Meredith, R. W. (Old Dominion Univ. Norfolk, VA, United States)
Becher, J. (Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
September 4, 2013
Publication Date
December 1, 1982
Subject Category
Acoustics
Report/Patent Number
TR-PTR-82-17
NAS 1.26:169630
NASA-CR-169630
Accession Number
83N15040
Funding Number(s)
CONTRACT_GRANT: NAG1-234
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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