[OPTICAL REVIEW Vol. 4, No. 1A (1997) 148-149]

Development of High Grade Fiber-Optic Gyroscopes

Kanshi YAMAMOTO and Yoshiyuki OKADA

Gyro Systems Dept., Marketing & RD Center, Tokimec Inc., 3-1, Takakuko, Nasumachi, Nasu-Gun, Tochigi, 325 Japan

(Received July, 1996; Accepted September 9, 1996)

Tokimec has been developing high grade interferometric fiber-optic gyroscopes (I-FOGs) for useful applications. The I-FOG consists of a sensing coil module, a light emitting module and an electronics circuits module. We achieved the bias stability of 0.003 deg/h and the angular random walk of 0.001 deg/√h and the scale factor error of 10 ppm (1σ). Then the azimuth error of the strapdown gyrocompass system with the high grade I-FOGs was less than ±0.05 s λ (deg) under the environmental temperature condition 23±5(°C).

Key words : fiber-optic gyroscope, gyrocompass