Accession Number : ADD006260

Title :   Fiber Interferometer Rotary Motion Sensor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Redman,Charles M

Report Date : 06 Feb 1979

Pagination or Media Count : 8

Abstract : The patent concerns a rotary motion sensor which employs a fiber interferometer more particularly comprises a system for driving a laser interferometer and electronically detecting the fringe shifts caused by rotation. In the preferred embodiment, a light emitting diode pumps a fiber laser which, in turn, drives a distribution waveguide. Coherent radiation from the distribution waveguide is partly backward-coupled by means of an acousto-optic grating into a reference optical waveguide. Coherent radiation from the distribution waveguide is also coupled into each end of a multiple turn optical waveguide which serves as a fiber interferometer. A pair of directional couplers, one for the clockwise, radiation and one for the counterclockwise radiation, extract the coherent radiation from the fiber interferometer after the radiation has made at least one transversal of the multiple turn optical waveguide. The respective clockwise and counter-clockwise signals will be phase shifted in proportion to the rotational rate of the system.

Descriptors :   *Patents, *Optical interferometers, *Lasers, Interferometers, Acoustooptics, Electrooptics, Rotation, Detection, Detectors, Phase shift

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE