激光陀螺克服高、低温冲击的技术研究

Technology Research for Ring Laser Gyro to Overcome the Environmental Temperature Variation

分析了激光陀螺在经历外部环境温度变化时光强和性能发生变化的原因,提出了利用新型腔长角度控制镜(光路程长控制镜)的角度控制元件作为驱动器件,应用类似小抖动稳频的原理对激光陀螺环形光路进行闭环控制,并通过对各光路控制单元采取分时控制的办法解决了光路稳定过程中的调制信号的冲突,使激光陀螺在环境变化时始终保持其光程长和光路相对位置的稳定从而保证其性能的稳定。实验结果表明,对原来在全使用温区(-40℃^+60℃)光强变化达30%甚至只要有光的,通过光路稳定措施可将光强稳定在±3%以内,对于有些在高低温时不能出光的,也可以达到可使用的光强稳定水平。较好地解决了许多激光陀螺难以克服的耐高、低温冲击问题。

By analyzing the light intensity of the ring laser gyro （RLG） and its performance changes with variations of the environmental temperature, a new method is put forward. The angle controllers of a novel cavity length and angle control mirror-light path and optical path length control mirror are used to realize the closed-loop control of the ring laser of RLG in a similar way to the dither frequency stabilization （hill climbing）. The modulation signal conflict is settled by controlling all the functional units in time-sharing control means. The optical path length and the light path of the ring laser are stabilized when the environmental temperature changes. The experimental results show that in the whole range of -40℃～＋60℃, in the condition that the original intensity fluctuation reaches 30 % or the intensity is very feeble, the light intensity variation is modulated within ±3 % with the controlling system, and even stabilized light intensity level is kept when the original intensity is zero under extremely high and low temperatures. The system resolves the environmental temperature influences on the RLG.