CAJ | 학술논문

针对红外中波/长波双波段制导系统性能测试与评估的需求，设计了一套基于数字微镜器件的红外双波段视景仿真光学系统，包括投影镜头和照明系统。讨论了大出瞳距、大后工作距情况下红外双波段投影系统的像差特性及设计方法，采用反摄远结构和谐衍射面结合的方案，解决了由双波段、大出瞳距离和大后工作距带来的系统彗差、像散、畸变以及色差难以平衡的问题。采用柯勒式直接照明的方案，解决了斜入射情况下均匀照明的问题，提高了光能利用率并有效地控制了杂光的影响。最终仿真系统全视场角为5o，F#为2.4，出瞳距离190 mm，出瞳直径84 mm，系统畸变小于0.1%，中波时系统奈奎斯特频率36 lp/mm下各视场调制传递函数大于0.4，长波时中间频率20 lp/mm处传递函数均大于0.38；照明均匀性高于98.5%。满足红外中波/长波双波段高质量模拟仿真的需求。
침대홍외중파/장파쌍파단제도계통성능측시여평고적수구，설계료일투기우수자미경기건적홍외쌍파단시경방진광학계통，포괄투영경두화조명계통。토론료대출동거、대후공작거정황하홍외쌍파단투영계통적상차특성급설계방법，채용반섭원결구화해연사면결합적방안，해결료유쌍파단、대출동거리화대후공작거대래적계통혜차、상산、기변이급색차난이평형적문제。채용가륵식직접조명적방안，해결료사입사정황하균균조명적문제，제고료광능이용솔병유효지공제료잡광적영향。최종방진계통전시장각위5o，F#위2.4，출동거리190 mm，출동직경84 mm，계통기변소우0.1%，중파시계통내규사특빈솔36 lp/mm하각시장조제전체함수대우0.4，장파시중간빈솔20 lp/mm처전체함수균대우0.38；조명균균성고우98.5%。만족홍외중파/장파쌍파단고질량모의방진적수구。
For the requirements of performance testing and evaluation of IR guidence system which works in dual-bands of MW/LW, a DMD based dual-bands infrared scene simulation system was designed, including a projection lens and illumination optical system. The aberration characteristics and design methods of the IR dual-bands projection system with long exit pupil relief and back focal length were discussed. An inverted-telephoto structure with a harmony diffraction surface was used to solve the aberrations such as coma, astigmatism, distortion and chromatic aberration which were difficult to balance. In the design of the illumination system, directly irradiation combined with the K-hler illumination principle was adopted to achieve a uniform illumination in the case of oblique incidence, also the improvement of light energy utilization and suppression of the stray light as well. The designed IR MW/LW scene simulator has a full field of view of 5o, F# of 2.4, and exit pupil relief of 190 mm. The distortion of the lens is less than 0.1%. At the Nyquist frequency of 36 lp/mm, the modulation transfer function (MTF) is higher than 0.4 in the band of MWIR; at the intermediate frequency of 20 lp/mm, the MTF is higher than 0.38 in the band of LWIR, at every field of view. The relative illumination is higher than 98.5%, which meets the requirement of the scene simulation.