| 摘要 |
In a fiber optic gyro of a zero serrodyne system employing a linear ramp voltage, a phase difference is provided, by a rectangular biasing voltage of a fixed period, between two rays of light which propagate through an optical fiber coil in opposite directions. Interference light of the two rays of light is detected and the detected output is synchronously detected by the biasing voltage in a synchronous detector. A positive increment and a negative increment in the synchronously detected output are detected by a positive increment detector and a negative increment detector, respectively. The positive and negative increments thus detected are added together by an adder, and based on the added output, a ramp voltage generator is controlled so that a maximum ramp phase shift which is applied to the two rays of light may be an integral multiple of 2 .pi.rad.
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