Accession Number : ADD017646

Title :   Deployable Hydrophone.

Descriptive Note : Patent Application, Filed 25 May 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

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

PDF Url : ADD017646

Report Date : 25 May 1995

Pagination or Media Count : 19

Abstract : A hydrophone having an optical fiber wrapped compliant mandrel forming a sensing fiber arm and an optical fiber wrapped metallic mandrel placed within the compliant mandrel having an air space between the two mandrels. The sensing and reference fiber arms are so configured as to form a Michelson interferometer for detecting pressure variations in a surrounding medium. The fiber wrapping of the compliant is such that the structural strength of the compliant mandrel is increased so as to withstand pressures generated at extreme depths to prevent crushing of the compliant mandrel into an air space. Within the center of the metallic mandrel is located a means for coupling the input and output optical fibers of an optical cable to the sensing and reference fiber arms. The area surrounding the coupler within the metallic mandrel is filled with an epoxy material and the entire hydrophone is encapsulated in polyurethane to render the hydrophone watertight but still transparent to the pressure variations in the surrounding medium. (MM)

Descriptors :   *FIBER OPTICS, *PATENT APPLICATIONS, *ACOUSTIC DETECTION, *HYDROPHONES, *ACOUSTOOPTICS, DEPLOYMENT, ELASTIC PROPERTIES, CABLES, DEPTH, PRESSURE MEASUREMENT, STRENGTH(MECHANICS), LIGHT SOURCES, EPOXY COMPOUNDS, POLYURETHANE RESINS, SOUND PRESSURE, MICHELSON INTERFEROMETERS, CRUSHING, VARIABLE PRESSURE, MANDRELS

Subject Categories : Acoustooptic and Optoacoustic Devices
      Acoustic Detection and Detectors
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE