Accession Number : AD0770846

Title :   Thermoacoustic Arrays.

Descriptive Note : Final rept. 1 Jan-31 Mar 73,

Corporate Author : TEXAS UNIV AUSTIN APPLIED RESEARCH LABS

Personal Author(s) : Muir,Thomas G.

Report Date : 30 OCT 1973

Pagination or Media Count : 15

Abstract : The generation of highly directive sound by thermal expansion of water was researched under the Contract and was shown, both theoretically and experimentally, to be possible. This report describes accomplishments to date in the theoretical category, i.e., the formulation of the thermoacoustic array problem in a simple inhomogeneous wave equation and its solutions for several initial conditions. Model tank experiments are described which use a small ruby laser operating in the conventional mode to produce a noise-like pulse absorbed in a copper sulfate solution. Acoustic energy was found to be generated by the thermoacoustic process, over a wide band governed by the frequencies contained in the noise-like laser pulse. (Modified author abstract)

Descriptors :   *Acoustic arrays, Sonar arrays, Ruby lasers, Heating, Water, Thermal expansion, Sound transmission, Wave equations

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE