Dual fiber optic gyroscope

Details Dual fiber optic gyroscope Dual fiber optic gyroscope

G - Physics

01

C

79/1

G01C 19/64 (2006.01) G01C 19/72 (2006.01)

Patent

CA 1319542

DUAL FIBER OPTIC GYROSCOPE ABSTRACT OF THE DISCLOSURE A fiber optic gyroscope includes a sensing coil formed of ordinary single mode fiber and a module including polarization maintaining optical fibers. A clockwise beam guided by a polarization maintaining fiber passes through a polarizer before being input to the sensing coil. The polarization module includes means for providing an an unpolarized counterclockwise beam to the sensing coil and means for phase modulating a predetermined polarization component. The module also depolarizes the clockwise beam after it has traversed the sensing coil. The clockwise and counterclockwise waves are both unpolarized when they combine in an optical coupler before impinging upon a detector that produces an electrical signal indicative of changes in the interference pattern to indicate rotation of the coil.

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