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采用半导体激光器(LD)是谐振式集成光学陀螺(RIOG)小型化发展的重要趋势,但是LD的电流调谐特性会引入强度噪声.理论分析了电流调谐致强度噪声对开环RIOG性能的影响,得到频率锁定位置与LD输出光强之间为线性关系.随后,提出了基于频率锁定位置的强度噪声抑制方案,通过频率锁定位置实时监测LD输出光强的变化,根据监测值得到补偿系数,并补偿陀螺输出.建立了抑制电流调谐致强度噪声的理论模型,并进行了实验验证,RIOG的零偏稳定性由0.768(°)/s提高到0.103(°)/s.
The use of semiconductor lasers (LDs) is an important trend in the miniaturization of RIOGs, but the current tuning characteristics of LDs introduce intensity noise.The influence of intensity-induced noise of current tuning on the performance of open-loop RIOGs is analyzed theoretically The relationship between the frequency locking position and LD output light intensity is linear.Afterward, the intensity noise suppression scheme based on the frequency locking position is proposed, and the change of LD output light intensity is monitored in real time by the frequency locking position, and the compensation coefficient is obtained according to the monitoring value, Gyro output, a theoretical model for suppressing intensity-induced noise of current tuning is established and verified by experiments. The bias stability of RIOG is increased from 0.768 ° / s to 0.103 ° / s.