基于DMD光谱可调的星模拟器光源光学系统设计

为满足在各种谱线分布下对星敏感器探测能力的高准确度标定,提出了一种基于数字微镜器件的光谱可调星模拟器光源光学系统设计方法,以解决星模拟器与星敏感器观星色温不匹配对星敏感器光信号定标准确度产生的问题.首先,根据设计指标选取Czerny-Turner型光学系统为光源光学系统,对Czerny-Turner型光学系统的彗差和象散进行分析,选取消彗差的Czerny-Turner结构;其次利用MATLAB程序求解Czerny-Turner型光学系统初始结构并应用ZEMAX对其进行优化;最后对光学系统进行公差分析.公差分析结果表明,在400~1 100nm的工作谱段范围内,光学系统的光谱分辨率小于2nm,设计结果满足要求,有效降低了光谱不匹配带来的定标误差.

Optical System Design of Star Simulator Light Source with Spectrum Adjustable Based on DMD

In order to satisfy the high precision calibration of the detection ability of star sensor in different spectrum distribution,a design method of star simulator light source system with spectrum adjustable based on digital micro-mirror device was presented,which could solve the issue of star sensor optical signal calibration precision caused by the mismatch between star simulator's color temperature and star sensor's detecting color temperature.Firstly,according to the design technical specification,the CzernyTurner optical system was selected as the light source optical system,two main aberrations of CzernyTurner system,coma and astigmatism,were analyzed,and a coma-corrected Czerny Turner structure was adopted.Secondly,the initial structure parameters of Czerny-Turner optical system was calculated by MATLAB and then optimized by ZEMAX.Finally,the tolerance analysis of the optical system was carried out.The result shows that the spectral resolution is less than 2 nm within the working spectrum range from 400 nm to 1 100 nm,which meets the requirements,and effectively diminishes the calibration error caused by spectral mismatch.