光纤陀螺环路增益高精度实时检测与闭环控制方法

The conventional control algorithm of the fiber optic gyroscope (FOG) can only achieve the stabilization of the feedback-path gain. However, the real-time detection and the stabilization of the forward-path gain, which is one of the most important parameters that affect the performances and reflect the working states of the FOG, cannot be realized. A method that achieves the high-precision real-time measurement and closed-loop control of the loop gain for the FOG is proposed. With an extra gain-monitoring modulation signal introduced, the real-time whole loop gain is detected accurately. Besides, the loop gain can be stabilized at the preset optimal value based on the proposed closed-loop automatic gain control. Experimental results show that the gain variations of optical devices, all optical loop and electronic devices under actual environmental conditions can be measured accurately, and the loop gain variation of the FOG under temperature variation is reduced from 19.8% to 0.12% significantly with the automatic gain control. The proposed method can be applied to different environment conditions, such as temperature variation, vibration, and long-term storage. What is more, the detection and stabilization of the full loop gain of the FOG is implemented without extra hardware circuits or equipment, which is referable to the design and applications of the FOG.