Thermal effect on the vanes in the main optical telescope of the solar space telescope
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摘要: 空间太阳望远镜（Space Solar Telescope，SST）主光学望远镜（Main Optical Telescope，MOT）口径达1 m，以2.8'1.5'视场对太阳成像，将获得0.1～0.15的高空间分辨率和高信噪比图像。SST MOT对日局部视场观测时系统所接收到的超千瓦热量，成为对望远镜成像产生极强影响的热源和杂散光源。基于SST MOT的特殊工况与需求，提出了MOT主镜筒在消杂光设计过程中需要兼容考虑叶片结构的热效应，讨论了同时影响该结构的几何结构特征函数（Geometry Composing Function，GCF）与辐射角系数的关联因素，确定了叶片结构热控与消杂光兼容设计的目标与评价体系。借助热分析软件计算了SST MOT主镜筒内因叶片结构不同几何参数变化后引起的系统温度的变化趋势，从热控角度对叶片结构的几何设计提出了建议：叶片优先采用垂直型结构、有效高度尽可能小，且叶片与主镜轴向间距应大于425 mm。文中探索的叶片结构热效应与杂散光效应兼容分析的方法也可为其他太阳光学望远镜的综合优化设计提供参考。Abstract: The space solar telescope(SST) is designed to obtain its diffraction limit quality with aperture over one meter. It observes the sun with a small view field of 2.8'1.5' to obtain its high spatial resolution imaging of 0.1-0.15. SST observes the sun directly can receive huge heat flow more than 1 000 W that will lead to unacceptable thermal distortion of the optical components. The sunlight enters into the telescope, which is an intense source of both heat and stray light. Based on the special thermal effect and stray light in the solar telescope, a compatibility analysis of the thermal effect of vanes in SST was performed. In the compatibility analysis, the geometric parameter of vane structure became a key point which would affect the geometry composing function(GCF) in stray light analysis and affect the radiation shape factor in thermal analysis synchronously. This paper presented the relationship between the thermal control design and scatting elimination plan on the vane structures in SST. The objective and method of the compatibility analysis were determined. With the thermal analysis software, the temperature fields were calculated for different geometric parameters of vane structure including depth, separation, and angle. A design of the vane structure was put forward in thermal control terms and the suggestion was put out synchronously, which restrains the vanes with less depth, more separation to the primary mirror and angled at 90. The aims of the optimal design of the vane structure of SST were studed reached. The thoughts and methods of the optimal analysis are also useful for similar optical telescopes designed for solar observation.
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Key words:
- vane /
- GCF /
- radiation shape factor /
- stray light
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