红外双色三视场光学系统设计

摘要

An infrared dual-band triple-field optical system with shared beam path is designed on the basis of analyzing the special dispersion properties of infrared material in the mid and long waveband. The system uses the form of secondary imaging which has corrected its aberration simultaneously in the dual band across the FOV and has a cold shield efficiency of 100%. The results show that the system has same focal length and same F number for all FOV in the waveband of 4~5mm and the waveband of 8~9mm, and the MTF value at 20lp/mm approximates to the diffraction limit across the FOV.%从分析红外材料在双波段上的色散特性出发，设计了一款共光路红外中、长波三视场光学系统。系统采用二次成像方式，满足100%冷光阑效率，在两个波段内同时完成了系统各视场的像差校正。设计结果表明，系统在4～5mm中波红外波段及8～9mm长波红外波段焦距、视场及F数均保持一致，各视场光学传递函数在20 lp/mm时均接近衍射极限。