CAJ | 학술논문

基于制冷型320×240凝视焦平面阵列探测器，设计了大口径离轴折反式中波红外连续变焦光学焦系统。系统工作波段为3.7~4.8μm，焦距范围250~2000 mm，F数为4。光学系统分离轴无光焦度系统和透射式连续变焦系统两部分设计，匹配对接后优化。解决了透射式连续变焦系统因材料限制不能做到大口径、共轴折反式连续变焦系统短焦遮拦比大和离轴三反不能做到100%冷光阑效率的缺陷。满足100%冷光阑效率，在空间频率16 lp/mm处系统的MTF值大于0.5，具有像质好，分辨率高等特点，满足设计要求。
기우제랭형320×240응시초평면진렬탐측기，설계료대구경리축절반식중파홍외련속변초광학초계통。계통공작파단위3.7~4.8μm，초거범위250~2000 mm，F수위4。광학계통분리축무광초도계통화투사식련속변초계통량부분설계，필배대접후우화。해결료투사식련속변초계통인재료한제불능주도대구경、공축절반식련속변초계통단초차란비대화리축삼반불능주도100%랭광란효솔적결함。만족100%랭광란효솔，재공간빈솔16 lp/mm처계통적MTF치대우0.5，구유상질호，분변솔고등특점，만족설계요구。
On the basics of a cool 320í240 detector with staring focal plane array, a large aperture off-axis catadioptric middle infrared continuous zoom system was designed. The system worked at 3.7-4.8 μm which achieved the zoom of 250 mm to 2 000 mm and F number of 4. The optical system was divided into two segments. Firstly, an off-axis aspheric non-power system as the front system was designed. Then the continuous zoom lens which matched with the non-power system as the back system was designed. Because of the material constraint, the refractive zoom system could not realize large aperture. Coaxal catadioptric zoom system had great block ratio. And three mirrors zoom system could not achieve cold shield efficiency 100%. The off-axis catadioptric zoom system cold account for forenamed limitation. The system cold offer a high resolution and excellent images, and its cold shield efficiency is 100%. The system satisfies the design requirements.