CAJ | 학술논문

针对中波制冷型640×512凝视型焦平面探测器，设计了一款长焦距高分辨率中波红外两档变焦光学系统。该系统工作波段为3.7~4.8μm，F 数为4.0，长焦距为800 mm，短焦距为400 mm，采用二次成像技术不仅减小了前固定组镜子的口径，而且实现了100%冷光阑匹配。系统采用锗和硅两种红外材料，通过引入非球面来校正轴外像差和高级像差。设计结果表明，系统在33 lp/mm 处，短焦距和长焦距的传递函数值均优于0.2，全视场畸变小于0.5%,具有结构紧凑、分辨率高、像质好等优点。
침대중파제랭형640×512응시형초평면탐측기，설계료일관장초거고분변솔중파홍외량당변초광학계통。해계통공작파단위3.7~4.8μm，F 수위4.0，장초거위800 mm，단초거위400 mm，채용이차성상기술불부감소료전고정조경자적구경，이차실현료100%랭광란필배。계통채용타화규량충홍외재료，통과인입비구면래교정축외상차화고급상차。설계결과표명，계통재33 lp/mm 처，단초거화장초거적전체함수치균우우0.2，전시장기변소우0.5%,구유결구긴주、분변솔고、상질호등우점。
For middle infrared cooled 640×512 detector with staring plane array, a middle infrared dual field of view optical system with long focal length and high resolution was designed. The wavelength range was 3.7-4.8 μm, F number was 4.0, long focal length and short focal length was 800 mm, 400 mm respectively. Reimaging technology had not only minished the diameter of front fixed group, but also met 100% cold shield efficiency. Two infrared materials Ge and Si were used in the optical system and two aspheric surfaces were used to correct the off axis aberration and higher order aberration. Moreever,the Modulation Transfer Function (MTF) was above 0.2 both the long focal length and short focal length at the spatial frequency 33 lp/mm. The distortion is below 0.5%. The results show that the middle infrared dual field of view optical system has small volume, high resolution and excellent image.