摘要
在在轨运行的热环境条件下,星载激光通信端机光学反射镜镜面的热变形会对空地激光通信链路性能产生严重影响。本文利用有限元分析软件ANSYS建立了星上激光通信端机光学反射镜的有限元模型,并对镜体在压圈固定方式与压板固定方式下的热变形进行了仿真。利用ZEMAX光学仿真软件就镜面的变形对光学系统产生的影响进行了分析。仿真结果表明,反射镜面的热变形将导致传输光束扩展、波前畸变,这些影响会使探测器接收功率降低,从而恶化空地激光通信链路的性能。因此为了建立稳定高效的空地激光通信链路,必须在镜面材料选择、镜体应力释放方式、镜体大小选择等方面进行合理设计。
Under the thermal condition in orbit, the performance of the space-to-ground laser communication link can be affeted seriously by the thermal distortion of the mirror on the satellite-borne laser communication terminal. In this paper, a ANSYS finite element analysis software is used to establish the finite element model of the mirror on the satellite-borne laser communication terminal and the thermal distortion of the mirror fixed by both a pressure circle and a pressure plate is simulated. The ZEMAX optical analysis software is used to analyze the impact of the mirror distortion on the optical system. The simulation result shows that the thermal distortion of the mirror can make the propagating beam expanded＇ and make the wavefornt distorted. These will lead to the reduction of the receiving power of the detector and thus cause the performance of the space-to-ground laser communication link to be degraded. Therefore, in order to establish a stable and highly effective space-to-ground laser communication link, the size, material and stress releasing of the mirror must be designed reasonably.
出处
《红外》
CAS
2008年第4期28-34,共7页
Infrared
关键词
激光通信
热变形
传输光束
光学系统
laser communication
thermal distortion
propagating beam
optical system
