Accession Number : ADD005964

Title :   Efficient Apparatus for Projecting Acoustic Waves.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Pickens,George O

Report Date : 27 Feb 1979

Pagination or Media Count : 7

Abstract : In an apparatus for projecting low-frequency acoustic waves in a liquid media, a chamber adapted to be immersed in the media contains gaseous material to provide a compliance and is provided with an aperture. A piston of selected mass is sealably mounted in the aperture, having one end adapted to displace a selected mass of the liquid media and the other end adapted to displace the gaseous material in the chamber. An actuating device is coupled to the piston for reciprocating it at the resonant frequency of a mechanical system which substantially comprises the compliance provided by the contained gaseous material, the mass of the piston, and the mass of the displaced liquid media. (Author)

Descriptors :   *Patents, *Acoustic equipment, *Acoustic waves, Low frequency, Underwater sound generators, Sonar

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE