Accession Number : ADD013926

Title :   Broadband, Acoustically Transparent, Nonresonant PVDF (Polyvinylidene Fluoride) Hydrophone.

Descriptive Note : Patent, Filed 7 Apr 86, patented 6 Dec 88,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Powers, James M ; Moffett, Mark B ; McGrath, John C

Report Date : 06 Dec 1988

Pagination or Media Count : 7

Abstract : An acoustically transparent voided, polyvinylidene fluoride (PVDF) hydrophone made of material whose impedance matches the characteristic acoustic impedance (rho c) of sea water, having drastically reduced diffraction and resonance effects. The frequency response is thus flat at frequencies less than one-half elastic wavelength in the PVDF material. An array of such hydrophones in front of a projector saves space without affecting projector performance. Patent. (fr)

Descriptors :   *ACOUSTIC IMPEDANCE, *HYDROPHONES, *PATENTS, DIFFRACTION, FLUORIDES, AUDIO FREQUENCY, FREQUENCY RESPONSE, POLYVINYLIDENES, REDUCTION, ACOUSTIC RESONANCE, SEA WATER

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE