Accession Number:

AD0642843

Title:

MEASUREMENTS OF ATMOSPHERIC STRUCTURE ABOVE 30 KM USING THE GRENADE METHOD AND IMPROVED ACOUSTIC TECHNIQUES,

Descriptive Note:

Corporate Author:

UNIVERSITY COLL LONDON (ENGLAND) DEPT OF PHYSICS

Personal Author(s):

Report Date:

1966-07-01

Pagination or Media Count:

132.0

Abstract:

The problem of detecting acoustic energy from grenades detonated in the upper atmosphere is considered and the natural pressure fluctuations which tend to limit detectability are discussed. Consideration is given to the most suitable system for obtaining the maximum altitude of detection and it is concluded that this should utilize a hot-wire microphone in conjunction with the newly-developed transmission and recording system. This instrumentation uses a Multiplex System for eliminating electrical transmission noise over a widely spaced microphone array and for providing a magnetic tape record which may be subsequently replayed to recover weak signals. A review of the method of temperature and wind determination from the observed travel time of sound waves is given, and results from four rocket flights at Woomera in October 1963 and one at Eglin in February 1965 are presented. Author

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE