Accession Number : ADD009151

Title :   High-Sensitivity, Low-Noise, Remote Optical Fiber.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bucaro,Joseph A

Report Date : 03 Nov 1981

Pagination or Media Count : 6

Abstract : This patent discloses an optical system which detects acoustical signals in a fluid medium such as seawater. The acoustical sensor assembly includes an acoustical sensor which is formed by two optical fibers which have different sensitivities to acoustical signals and are connected with the optical radiation conductor or conductors by use of an optical coupler which couples optical radiation into each of the optical fibers of the acoustical sensor. Since the optical fibers of the acoustical sensor have different acoustical sensitivities to acoustical signals, the phase of the optical radiation transmitted through each optical fiber of the acoustical sensor will change differently due to acoustical signals incident thereon. The optical radiation from the optical fibers of the acoustical sensor is directed back through an optical fiber to a photodetector. The photodetector produces a modulated output signal in accordance with the acoustical energy detected. (Author)

Descriptors :   *Patents, *Fiber optics transmission lines, Acoustic measurement, Low noise, Phase shift, Refractive index, Acoustooptics, Acoustic detection, Ocean environments, Underwater sound signals, Fiber optics, High sensitivity

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE