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  • Acoustics  (1)
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    Acoustic Echo-Sounding Experiments in an Urban Environment (1971)
    In:  Other Sources
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    Publication Date: 2019-08-13
    Description: A 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.
    Keywords: Acoustics
    Type: AIAA Paper 71-1124 , Sensing of Environmental Pollutants; Nov 08, 1971 - Nov 10, 1971; Palo Alto, CA; United States
    Format: text
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