Signal processing system of optical fiber gyro

Details Signal processing system of optical fiber gyro Signal processing system of optical fiber gyro

G - Physics

01

C

G01C 19/72 (2006.01)

Patent

CA 2049163

A signal processing system of an optical fiber gyro comprises a light emitting element for generating a monochromatic light, a fiber coil, a branching element for dividing the monochromatic light into clockwise and counterclockwise lights, for transmitting the clockwise and counterclockwise lights to opposite ends of the fiber coil, respectively, and for uniting again the clockwise and counterclockwise lights into a coherent light, a light receiving element for detecting an intensity of the coherent light, and an auxiliary light receiving element for monitoring an output of the light emitting element. When the light emitting element output is less than a predetermined value, a power for driving the light emitting element is controlled so that a direct current component or even times higher harmonics component of a sensor signal obtained from the light receiving element becomes constant. When, on the other hand, the light emitting element output has reached the predetermined value, the light emitting element output is controlled by a monitoring signal of the auxiliary light receiving element so that it does not exceed the predetermined value.

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