微型太阳敏感器光学掩模的镀膜设计

Design for optical mask of micro sun sensor

太阳敏感器是空间飞行器进行姿态确定和方位测定的重要器件,传统太阳敏感器大而重,无法应用到微小卫星特别是皮纳卫星上。介绍了基于CMOS APS探测器的微型太阳敏感器的工作原理,基于黑体辐射理论和太阳光谱特性,结合CMOS APS探测器工作特性,分析给出了这种敏感器像元表面产生光电子数的计算方法,并采用M atlab软件,编程计算了地球表面太阳垂直入射条件下,探测器像元表面产生的光电子数。采用光学薄膜设计方法,分析设计了掩模表面光学薄膜的膜系结构,计算了各膜层的透射特性。在此基础上,得到了基于CMOS APS探测器微型太阳敏感器光学掩模的光学薄膜的设计方法,最后给出了设计结果。

Sun sensor is an important attitude control and azimuth measurement device for spacecrafts. The operation principle of the micro sun sensor based on CMOS APS detector is introduced. The calculation method of photoelectron generated on the surface of CMOS APS is analyzed. The amount of the photoelectrons was calculated when the sunlight incidence was vertical to the surface of the earth. The composition of the optical films on the surface of the mask for the micro sun sensor was designed and the transmittance spectrum characteristic of every layer was figured out. An optical film design method of the mask for a micro sun sensor based on the CMOS APS is presented.