Accession Number : ADD015608

Title :   Low Flow-Noise Conformal Fiber Optic Hydrophone.

Descriptive Note : Patent, Filed 21 Feb 91, patented 18 Aug 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Fisher, Stanley A

Report Date : 18 Aug 1992

Pagination or Media Count : 6

Abstract : A fiber-optic hydrophone having a pair of jacketed fiber optic windings formed in a concentric planar spiral configuration in a layer of polyurethane is provided. One of the fiber optic windings has a fiber with a bonded acoustically sensitive jacket thereby increasing its sensitivity to acoustic energy. The second fiber optic winding, the reference winding, has a unbonded jacket enclosing the fiber resulting in reduced sensitivity to acoustic energy. Sensitivity to vibrational energy; however, is not reduced. The combining of signals from the pair of fibers provides a vibration-canceled acoustic signal.

Descriptors :   *FIBER OPTICS, *HYDROPHONES, *OPTICAL INTERFEROMETERS, *ACOUSTIC DETECTION, ACOUSTIC SIGNALS, CONFIGURATIONS, ENERGY, SENSITIVITY, VIBRATION, WINDING, PATENTS, POLYURETHANE RESINS, ACOUSTOOPTICS

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE