Research on thermal optical properties and thermal control technology of primary mirror assembly
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摘要: 针对共光路系统对环境温度的适应性问题，以温度-光学变形特性研究为基础，提出了一种基于综合传热的主镜组件分区域热控方法。建立了主镜组件的传热模型并分析了典型热控工况下的温度分布特性；对不同材质的主镜进行了热仿真，以热光学试验结果修正模型，使主镜温度场的仿真与实测结果绝对偏差小于1.4 ℃，同时确定了主镜组件的温度梯度控制阈值；采用分区传热策略，使主镜组件达到高温升水平、低温度梯度的热控目标。以某主镜组件为对象进行了仿真与试验：当主镜平均温升达到16 ℃以上时，镜体轴向温度梯度≤2.5 ℃、径向与周向温度梯度≤2.4 ℃，主镜面形变化量小于0.005 λ，该结果可为共光路系统的整体热控方案设计提供优化思路。Abstract: Aiming at the adaptability of common optical path system to ambient temperature, a thermal control method of primary mirror assembly based on comprehensive heat transfer is proposed based on the temperature optical deformation characteristics. The heat transfer model of the primary mirror assembly is established, and the temperature distribution under typical conditions are analyzed; The thermal simulation of the main mirror with different materials is carried out, and the model is modified with the thermal optical test results, so that the absolute deviation between the simulation and the measured results of the temperature is less than 1.4 ℃. At the same time, the temperature gradient control threshold of the assembly is determined; On this basis, the zoning heat transfer strategy is adopted to make the main mirror assembly reach the goal of high temperature rise level and low temperature gradient. Taking a main mirror assembly as the object, the simulation and test are carried out, When the average temperature rise of the main mirror reaches more than 16 ℃, the axial temperature gradient of the mirror is ≤ 2.5 ℃, the radial and circumferential temperature gradient is ≤ 2.4 ℃, and the change of the main mirror shape is less than 0.005 λ,The results can provide an optimization idea for the overall thermal control design of the common optical path system.
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Key words:
- common optical path system /
- primary mirror /
- temperature gradient /
- thermal control
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表 1 碳化硅主镜温度梯度与面形精度
Table 1 Temperature gradient and Surface shape accuracy of Sic primary mirror
加热功率/W 15 34 温度/℃ 轴向梯度 0.9 1.6 径向梯度 0.5 1.2 周向梯度 0.3 0.9 平均温升 8.3 21.1 面形精度/λ RMS 0.072 0.13 RMS（祛除球差） 0.021 0.023 
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