衰荡光腔温度控制研究

Study on Temperature Control for Ring-down Cavity

研制出一套光腔衰荡光谱中的温度控制系统。首先,设计了内壁带有硅胶加热片的控温箱体,将光腔置于箱体中并模拟内部温度分布;然后,对箱体进行有限元分析及参数化扫描,得到最优化情况下加热片的分布及功率大小,保证光腔通光部分温度的均匀性;根据仿真结果完成实际控温箱体和加热片的加工,以比例积分微分(PID)控制算法为核心,设计包括温度采样模块、控制模块、驱动电路模块等在内的硬件电路系统,开发相应的控制算法,精密控制光腔内部的温度变化,实现衰荡光腔通光部分8 h内温度变化标准差不超过0.01℃。

A temperature control system for ring-down cavity is developed. The temperature control box with silicone beating plate on the inner wall is designed firstly, which the ring-down cavity is placed in. The internal temperature distribution is simulated. The finite element analysis and parametric scanning are carried out to get the optimized distribution and power of the heating plate to ensure the temperature uniformity along the light-transmitting part of the cavity. According to the simulation results, the actual box and heating plate are fabricated. Then, the hardware circuit system including temperature sampling module, control module and drive circuit module are designed with PID control algorithm as the core, and the corresponding control algorithm is developed to precisely control the cavity temperature change. After the precision temperature control system is completed, the standard deviation of the temperature variation along the light-transmitting part of the ring-down cavity is less than 0. 01 ℃ in 8 hours.