空地激光通信星载光学天线在太阳阴影区的镜面热变形有限元分析  

Finite Element Analysis of Mirror Thermal Distortion within the Sun Shadow in Space-to-Ground Laser Communication Links

作　　者：李晓峰[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054

出　　处：《光电子．激光》2006年第2期183-186,共4页Journal of Optoelectronics·Laser

基　　金：国家"863"计划资助项目(2002AA107493);电子科技大学青年基金资助项目(JX03018)

摘　　要：对高真空空间热环境中,在轨运行于太阳阴影区内的空地激光通信星载光学天线镜面热变形进行了有限元分析。结果表明:镜面内凹,镜体在Z轴方向的变形位移量随温度的降低呈现非线性增加趋势,由于变形位移量变化在不同取样分析点上以及在不同温度条件下并不完全相同,经此热变形镜传输的激光束将产生波前畸变及光斑移位,严重地影响光束质量和传输特性;镜面热变形同时导致镜面法向偏转,使得经其反射的光束产生较大的指向偏转误差,在本文分析参数条件下的镜面法向偏转(平均值)可达18.65ΜRAD。When satellite orbits within the shadow of the sun and in vacuum and thermal environment,mirror thermal distortion in space-to-ground laser communication links is analyzed with the method of finite element analysis. Mirror thermal distortion causes mirror＇s surface concave,and mirror＇s displacement in z direction caused by the distortion tends toward nonlinear increasement with the decrease of temperature. Because the displacement is incompletely identical owing to different sampling points and different temperature, it would cause wavefront aberration and facula displacement of laser beam that is transferred by the mirror, which deteriorate the beam quality and t.ransfer characteristics. Besides,thermal distortion causes normal deflexion of the mirror＇s surface, and accordingly makes a relatively large error in direction deflexion of the beam that is reflected by the mirror. In this paper,the average normal deflexion is about 18.65 μrad under certain conditions.

关 键 词：镜面热变形 太阳阴影区 镜面法向偏转 空地激光通信 

分 类 号：TN929.11[电子电信—通信与信息系统]