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Acoustic Echo-Sounding Experiments in an Urban EnvironmentA 1320 Hz tuned source was mounted on a 4 ft diameter parabolic reflector, with the same driver working as the receiving transducer. This highly directional system is able to detect the small amount of energy backscattered from a vertically directed pulse of sound by inhomogeneities in the density structure of the atmosphere even in the presence of city noises which include rapid-transit and express-way traffic sounds. Results showing thermal plumes and the formation and breakup of radiation inversions are presented. A network of such echo-sounding stations in and around a city could be used to give early warning of atmospheric conditions which might lead to a pollution incident.
Document ID
19990111650
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Damkevala, R. J.
(IIT Research Inst. Chicago, IL United States)
Date Acquired
August 19, 2013
Publication Date
November 10, 1971
Subject Category
Acoustics
Report/Patent Number
AIAA Paper 71-1124
Meeting Information
Meeting: Sensing of Environmental Pollutants
Location: Palo Alto, CA
Country: United States
Start Date: November 8, 1971
End Date: November 10, 1971
Sponsors: American Inst. of Aeronautics and Astronautics, Instrument Society of America, National Oceanic and Atmospheric Administration, Institute of Electrical and Electronics Engineers, American Chemical Society, Environmental Protection Agency, NASA Headquarters
Distribution Limits
Public
Copyright
Other

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