光学 精密工程, 2014, 22 (11): 3019, 网络出版: 2014-12-08
广角极光成像仪滤光片的热设计及试验
Thermal design and verification of transmission filter for wide angle aurora imager
广角极光成像仪 高温滤光片 极光观测 热阻 光学系统 灵敏度 Wide Angle Aurora Imager(WAAI) high temperature transmission filter aurora observation thermal resistance optical system sensitivity
摘要
针对广角极光成像仪对其光学系统温度的特殊需求, 对成像仪使用的高温滤光片进行了热设计及相关试验。介绍了广角极光成像仪的光机结构, 尤其是滤光片组件的结构。通过建立传导和辐射热阻的计算方程组, 分析了由滤光片到镜筒整个换热路径中存在的热阻及其影响因素。然后, 以影响热阻的因素作为设计变量, 分析了影响镜筒温度的敏感变量。最后, 提出了高温滤光片的热设计方案。真空验证试验表明: 在高温和低温两种极端工况下, 滤光片温度水平分别稳定在105.8 ℃和138.2 ℃, 其控温准确度优于±2.5 ℃, 控温稳定度优于0.75 ℃/min;反射镜组和探测器窗口温度水平和温差都满足热控指标。得到的结果显示, 基于热阻和温度灵敏度分析的设计方法, 能够快速明确影响热阻的敏感设计变量, 减少设计过程的盲目性。空间高温滤光片的热设计满足了光学系统的要求, 保证了广角极光成像仪滤光片组件与反射镜之间的温差。
Abstract
According to the demands of a Wide Angle Aurora Imager (WAAI) for its optical system in temperature, the thermal design and related test of a high temperature transmission filter in the imager were performed. The optical-mechanical structure of the imager was introduced, especially the transmission filter component. Then, based on establishing a equation set for conducting and radiating thermal resistance, the thermal resistance and its effect factors in the overall heat transfer path from the transmission filter to optical bench were analyzed. Furthermore, the effect factors on the thermal resistance were taken as design variables and the sensitive variables on the barrel temperature were analyzed. Finally, the thermal design of the space optical system was implemented depending on the above analysis result. Experimental results indicate that the filter average temperature reach 105.8 ℃ and 138.2 ℃, respectively, the control temperature accuracy is less than ±2.5 ℃ and the temperature stability is less than 0.75℃/min under the cold and hot extreme cases. The temperature indexes of the mirrors and detector window also satisfy the design demands. It concludes that the design method based on thermal resistance and temperature sensitivity analysis could find the sensitive design variables rapidly, reduce the blindness during thermal design. Moreover, the thermal design of the space high temperature transmission filter satisfies the optical requirement and effectively maintains the temperature difference between transmission filters and mirrors.
杨化彬, 陈立恒, 李义, 刘宏伟, 何飞. 广角极光成像仪滤光片的热设计及试验[J]. 光学 精密工程, 2014, 22(11): 3019. YANG Hua-bin, CHEN Li-heng, LI Yi, LIU Hong-wei, HE Fei. Thermal design and verification of transmission filter for wide angle aurora imager[J]. Optics and Precision Engineering, 2014, 22(11): 3019.