Accession Number : ADD000713

Title :   Sound Absorbing Material.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Cook,Rufus L

Report Date : 15 Oct 1974

Pagination or Media Count : 16

Abstract : The patent application concerns a novel combination of molded plastic foam material and deaerated plastic material bonded together so as to have a boundary or interface therebetween that is characterized by a large number of acoustic energy concentrating surfaces. Acoustic energy arriving from an aqueous medium into the deaerated material is focused by the boundary surfaces into small zones of high energy intensity, which promotes dispersion of the energy into the foam material where it is dissipated. It is a principal object of the invention to provide an improved sound or acoustic energy absorbing material for use in underwater environments, for example in sonar systems.

Descriptors :   *Sonar equipment, *Acoustic filters, *Underwater equipment, *Polyurethane resins, Foam, Laminates, Anechoic chambers, Underwater sound, Patents

Subject Categories : Plastics
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE