Accession Number : ADD014666

Title :   Flextensional Hydrophone.

Descriptive Note : Patent, Filed 17 Apr 89, patented 21 Aug 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Garrett, Steven L ; Danielson, Donald A

Report Date : 21 Aug 1990

Pagination or Media Count : 14

Abstract : This patent discloses an omnidirectional hydrophone having an elastic shell which is spheroidal so that the circumference of the shell about different axes changes differentially when the shell is subjected to pressure variations. The differences in circumference are advantageously measured by an optical fiber interferometer having one leg wound about the equatorial circumference. The shell may be an oblate spheroid having the ratio of its major axis to is minor axis greater than about (2-v)1/4, where v is Poisson's ratio of the shell material, so that the shell narrows along one axis an widens along the other when the shell is subjected to a pressure change. (jhd)

Descriptors :   *ELASTIC SHELLS, *HYDROPHONES, *PATENTS, AXES, FIBER OPTICS, OMNIDIRECTIONAL, OPTICAL INTERFEROMETERS, POISSON RATIO, PRESSURE, RATIOS, VARIABLE PRESSURE

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE