摘要
针对铝合金材料,设计了大口径红外相机主反射镜,反射镜口径420mm。以径厚比、支撑点数量和轻量化结构形式为输入点,设计了一种背部开放式、三角形轻量化结构和背部3点支撑的结构形式。通过有限元分析软件对反射镜的动态刚度及自重和温度载荷下的面形变化进行了分析。分析结果表明:反射镜具有高的动态刚度,反射镜自重工况和-40℃均匀温降下,面形精度RMS分别为30nm和0.2nm,均满足光学设计提出的λ/10(λ=632.8nm)指标要求,为大口径铝合金反射镜的设计提供了理论依据。
Aiming at the aluminum alloy material, a large-aperture primary mirror of infrared camera was designed with the mirror aperture of 420 mm. Starting from the diameter-thickness ratio, the number of the support points and the lightweight structural form, a structure of open back, triangle lightweight construction and back three-point support was designed. Dynamic stiffness of the mirror and surface shape change under the weight and temperature loads were analyzed by the finite analysis software. The results show that the natural frequency of the mirror is enough, which has a sufficiently high dynamic stiffness. Both surface accuracy RMS of the mirror（30 nm,0.2 nm） have reached the index requirements of the optical system （λ/10,λ= 632.8 nm） under gravity and a uniform temperature drop of -40 ℃, which provides a theoretical basis for the design of infrared aluminum mirror.
出处
《应用光学》
CAS
CSCD
北大核心
2016年第3期337-341,共5页
Journal of Applied Optics
基金
国家自然科学基金青年科学基金项目(61405192)
中国科学院国防科技创新基金项目(CXJJ-15S158)
关键词
红外相机
铝合金反射镜
大口径
轻量化
有限元分析
infrared camera
aluminum mirrors
large aperture
lightweight
finite element analysis
