Accession Number : ADD017460

Title :   Hydrophone Transduction Mechanism.

Descriptive Note : Patent, Filed 21 Jun 93, patented 28 Feb 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Dandridge, Anthony ; Yurek, Aileen M ; Tveten, Alan B

Report Date : 28 Feb 1995

Pagination or Media Count : 10

Abstract : A sensing portion for an interferometric planar hydrophone is disclosed which comprises: a support assembly; a plurality of hollow compliant mandrels mounted to the support assembly in a fixed planar relationship with respect to each other to form a planar configuration; a sensing optical fiber sequentially wound around each of the plurality of mandrels to form a single, serial, optical sensing arm or path between an input position on a first one of the plurality of mandrels and an output position on a last one of the plurality of mandrels; and an acoustically transparent material encapsulating the sensing portion to form a sealed compliant planar hydrophone. In an operational system, an interferometric planar hydrophone is disclosed which comprises: the sensing portion in which the sensing arm is operative to measure a predetermined measurand in a preselected environment and which sensing portion further includes a reference optical fiber environmentally isolated from the predetermined measurand; a light source for transmitting coherent light to both of the sensing and reference optical fibers: and circuitry responsive to light received from the sensing aid reference optical fibers for developing an output signal indicative of phase shift differences between the sensing and reference optical fibers to determine the predetermined measurand. (MM)

Descriptors :   *OPTICAL DETECTION, *ACOUSTIC ARRAYS, *HYDROPHONES, *PATENTS, FIBER OPTICS, ACOUSTIC DETECTION, LIGHT TRANSMISSION, INTERFEROMETERS, MANDRELS

Subject Categories : Acoustic Detection and Detectors
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE