Fiber optic rotation sensor

Details Fiber optic rotation sensor Fiber optic rotation sensor

G - Physics

01

C

345/10

G01C 19/64 (2006.01) G01C 19/72 (2006.01) G01P 3/36 (2006.01)

Patent

CA 1210482

FIBER OPTIC ROTATION SENSOR Abstract A fiber optic rotation sensor, employing the Sagnac effect, comprises all fiber optic components, positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator for phase modulating light waves which counterpropagate through a loop formed in the fiber optic strand. The modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal. The rotation sensor is mounted in a u- metal housing to shield it from the effects of ambient magnetic fields. An isolator is utilized to prevent the optical output signal from returning to the laser source. This advantageously reduces power losses in the system by eliminating the need for a coupler to couple the output signal to a detector.

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