CAJ | 학술논문

为了用同一设备对目标在中红外光谱段同时实现跟踪和捕获，针对像元尺寸为15μm×15μm的新型大面阵640×512红外探测器，设计了一套大面阵中红外光谱变视场探测成像系统，系统光谱范围为3．7～4．8μm，F数为4．0，窄视场为0．45°，宽视场为0．90°，通过利用机械机构在窄视场结构中切入两片透镜实现宽视场结构，应用二次成像技术不仅有效减小了前固定组透镜口径，而且实现了100％冷光阑匹配，减小了进入红外探测器的杂光。该系统仅采用了锗和硅两种常用的红外材料，为了有效校正系统的轴外像差和高级像差，并保证变视场系统两种结构的齐焦性，系统应用了非球面技术。设计结果表明，奈奎斯特频率33 lp·mm-1处，系统的窄视场和宽视场的传递函数值均优于0．2，所有视场畸变均小于0．5％，具有优良的成像性能。在极端温度-35～55℃范围时，该大面阵中红外光谱变视场探测成像系统窄视场结构和宽视场结构的成像质量变化不大，满足使用要求。
위료용동일설비대목표재중홍외광보단동시실현근종화포획，침대상원척촌위15μm×15μm적신형대면진640×512홍외탐측기，설계료일투대면진중홍외광보변시장탐측성상계통，계통광보범위위3．7～4．8μm，F수위4．0，착시장위0．45°，관시장위0．90°，통과이용궤계궤구재착시장결구중절입량편투경실현관시장결구，응용이차성상기술불부유효감소료전고정조투경구경，이차실현료100％랭광란필배，감소료진입홍외탐측기적잡광。해계통부채용료타화규량충상용적홍외재료，위료유효교정계통적축외상차화고급상차，병보증변시장계통량충결구적제초성，계통응용료비구면기술。설계결과표명，내규사특빈솔33 lp·mm-1처，계통적착시장화관시장적전체함수치균우우0．2，소유시장기변균소우0．5％，구유우량적성상성능。재겁단온도-35～55℃범위시，해대면진중홍외광보변시장탐측성상계통착시장결구화관시장결구적성상질량변화불대，만족사용요구。
In order to track and capture target at the same time with a set of equipment,a middle infrared spectrum variational field of view(fov)detection system with a large focal plane array was designed for a 640×512 novel large focal plane array infra-red detector with the picture element size of 15 m×15 m.The spectrum range was 3. 7~4. 8 m,F number was 4. 0,narrow FOV and wide FOV was 0. 45 and 0. 90 respectively.The manner of variational FOV was accomplished by pitching two lenses into the narrow FOV system layout with mechanism framework.Reimaging technology not only minished the diameter of front fixed group,but also met 100% cold shield efficiency to minish stray light into the infrared detector.Two common infrared ma-terials Ge and Si were used in the variational FOV detection system.The aspheric technology was used in order to correct the off axis aberration and higher order aberration and assure the fixedness of image plane.At the spatial frequency 33 lp·mm-1 ,the modulation transfer function(MTF)was above 0. 2 for both the narrow FOV and wide FOV.Moreover,the distortion is below 0. 5%.The middle infrared spectrum variational FOV detection system has excellent image.The image quality of the middle in-frared spectrum variational field of view detection system changed little in the working temperature range -35~55 ℃.