Accession Number : AD0163990

Title :   Underwater Acoustic Projector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Renna,Nicholas , Jr

Report Date : 19 DEC 1972

Pagination or Media Count : 6

Abstract : The patent describes a high efficiency, broadband acoustic projector for deep water applications in excess of twelve thousand feet. The projector comprises an active element consisting of a plurality of piezoelectric staves electrically connected in series. The staves are physically arranged in a cylindrical assembly prestressed in a fibrous glass wrapping, and installed in an annular, acoustically transparent, neoprene boot. Air-exhausted oil fills the boot to completely immerse the active element and thereby couple the radiated energy thereof to the surrounding water. The center cavity of the projector is open at both ends for free-flooding. Broadband response is achieved by close-coupling the active element's cavity and hoop resonances whereby they reinforce each other across a broad range of operating frequencies.

Descriptors :   (*SONAR PROJECTORS, *PATENTS), UNDERWATER SOUND GENERATORS, BROADBAND

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE