Fiber optic gyro

Details Fiber optic gyro Fiber optic gyro

G - Physics

01

C

345/10

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

Patent

CA 2012788

- 26 - ABSTRACT OF THE DISCLOSURE A modulated phase difference is detected between two rays of light phase modulated by a phase modulator, having propagated through an optical fiber coil in opposite directions and interfering with each other. A ramp voltage controlled in polarity and frequency in accordance with the detected phase difference is generated. The ramp voltage is applied to the phase modulator to control it so that a maximum phase shift of light thereby is 2.pi. k rad (where k = ? 1, ? 2, ...). To correct the temperature characteristic of the phase modulator, a peak value control circuit creates a reference voltage corrected by a voltage detected by a temperature sensor and controls the peak value of the ramp voltage by the reference voltage, thereby ensuring that the maximum phase shift of light in the phase modulator is always 2.pi. k rad regardless of temperature changes.

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