Accession Number : ADD018598

Title :   Interferometric Fiber Optic Doppler Velocimeter with High Dynamic Range

Descriptive Note : Patent application, filed 20 May 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Fabiny, Larry ; Kersey, Alan D ; Gottwald, William D

PDF Url : ADD018598

Report Date : 20 May 1997

Pagination or Media Count : 24

Abstract : A fiber optic velocity sensor system for measuring the Doppler shift in the optical frequency of light reflected from a moving surface is disclosed. The velocity sensor system comprises: a source of coherent light; a sensor for directing the coherent light to a moving surface and collecting a Doppler-shifted return signal from the moving surface; an unbalanced optical interferometer for changing the Doppler-shifted return light into an optical phase shift; and a processor for converting the optical phase shift from the interferometer into a voltage signal proportional to the velocity of the moving surface. Other embodiments of the fiber optic Doppler velocity sensor system of the invention include an embodiment with enhanced dynamic range, an embodiment with selectable responsivity, and an embodiment with multiple optical pickup heads.

Descriptors :   *FIBER OPTICS, *PATENT APPLICATIONS, *LASER VELOCIMETERS, LASER BEAMS, COHERENT OPTICAL RADIATION, OPTICAL INTERFEROMETERS, OPTICAL DETECTORS, DOPPLER EFFECT, PHASE SHIFT, HIGH DYNAMIC RANGE

Subject Categories : Lasers and Masers
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE