Accession Number : AD0783099

Title :   A Theoretical and Experimental Investigation of the Parametric Acoustic Receiving Array.

Descriptive Note : Technical rept.,


Personal Author(s) : Truchard,James J.

Report Date : MAY 1974

Pagination or Media Count : 149

Abstract : The parametric reception of a low frequency plane wave by the use of nonlinear interactions between acoustic waves is examined both theoretically and experimentally. The parametric reception of a low frequency wave is accomplished by the use of a high frequency acoustic pump wave which interacts with the low frequency signal wave to produce sound waves at the sum and difference frequencies. These sound waves are received by a second transducer placed on the axis of the pump transducer. This type of parametric array allows for the possibility of narrowbeam detection of a low frequency acoustic signal wave. (Modified author abstract)

Descriptors :   *Underwater sound, *Acoustic arrays, Plane waves, High frequency, Low frequency, Hydrophones, Transducers, Wave equations, Computer programs

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE