光谱维编码中红外光谱成像系统的光学设计

Optical design of MWIR spectral imaging system encoding in spectral dimension

基于双DMD提出了一种光谱维编码的中波红外光谱成像系统,利用空间维DMD完全补偿了光谱维编码DMD引起的像面倾斜。介绍了系统的组成和工作原理,设计了焦距为240 mm、F数为3的望远系统作为前置成像单元,采用双光路Offner光栅成像系统配合光谱维编码DMD同时实现了光线的色散、编码和合光等多个功能,设计了放大倍率为1的中继成像系统实现冷光阑匹配。通过整体优化设计实现了对双光路Offner光栅成像系统残余像差的补偿,设计结果表明,系统具有良好的空间成像和光谱性能,作用距离满足设计要求。

Dual-DMD based MWIR spectral imaging system encoding in spectral dimension was proposed, the tilt of image plane offset caused by the spectral encoding DMD was compansated by a DMD which in the spatial dimension. The composition and working principle of the system were introduced. As a front imaging unit, the telescopic system with a focal length of 240 mm and a F number of 3 was designed. The dual-pass Offner spectroscopic system and the spectral encoding DMD were used to realize multiple functions such as dispersion,encoding, and recombination. A relay imaging system with a magnification of 1 was designed to achieve strict matching of the cold stop. Through the integrated optimization design, the remaining aberrations of the dual-pass Offner spectroscopic system was compensated. The result of designing shows that the system has good spatial imaging and spectral performance, and the operating distance meets the design requirement.