温度对空间薄膜反射镜成形影响  

Thermal effects on figuration of space membrane mirrors

作　　者：张鹏[1,2] 金光[1] 张元[1] 钟兴[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院研究生院,北京100049

出　　处：《红外与激光工程》2011年第12期2432-2436,共5页Infrared and Laser Engineering

基　　金：国家863计划(2007AA12Z113)

摘　　要：空间薄膜反射镜属于未来空间超大、超轻的反射镜,可以有效减少发射质量和装载体积。环境温度变化将影响薄膜反射镜的焦距和面形。利用有限元软件建立温度对薄膜反射镜成形影响的计算模型,分析了均匀温度变化、径向温度梯度、周向温度梯度3种形式下薄膜反射镜面形变化。以口径Ф300 mm的静电拉伸薄膜反射镜为实验平台,针对均匀温度变化情况进行试验,根据分析结果归纳了温度变化影响补偿的方法。结果表明:相比传统光学元件,温度轻微变化给薄膜反射镜的焦距和面形带来明显变化,均匀温度变化对薄膜反射镜的焦距影响最大,而周向温度梯度对面形影响最大,试验结果验证了有限元模型的正确性。Space membrane mirrors belong to large,ultralight weight reflectors in future,which can reduce launch mass and stowed volume.The ambient temperature change will affect the focal length and surface figure.So finite element software was used to establish the model of the thermal effects on membrane mirrors,the surface figures were analyzed under uniform temperature distribution,radial temperature distribution and cycle temperature distribution.Taking Ф300 mm in diameter,electrostatic stretching membrane mirror as platform,some experiments were carried out under uniform temperature distribution.The compensation method was given from analysis results.The results show that： compared with traditional optical elements,a slight change in temperature to membrane mirror brings significant change of focal length and surface figure,uniform temperature distribution has the greatest influence on focal length of membrane mirror,cycle temperature distribution has the greatest influence on shape of membrane mirror.The experiment results show that the finite element model is correct.

关 键 词：薄膜反射镜 静电拉伸 温度影响分析 温度影响补偿 

分 类 号：TH751[机械工程—仪器科学与技术] TH703[机械工程—精密仪器及机械]