摘要
为了实现激光/红外双模导引头成像系统的小型化,简化光学系统结构,设计了四次反射的双模共光路环形孔径超薄成像系统,研究了该系统的分光路设计原理,给出了遮拦比与视场角的关系,实现了仅有单一光学元件的长波红外7.7~9.5μm和激光1.064μm双模导引头成像系统。双模环形孔径系统在长波红外波段的焦距为70 mm、等效F数为1.3、全视场为8°、空间频率为41.7 lp/mm时各视场MTF值均大于0.136。双模环形孔径系统在激光波长的焦距为53.8 mm、等效F数为1、全视场为10°、全视场范围内的光斑分布均匀。在环境温度范围为-40~80℃时,长波红外波段各视场MTF值均大于0.13,激光波长的弥散斑形状和能量分布基本不变,实现了光学被动无热化。通过公差分析可知双模环形孔径系统具备可加工性。
In order to realize the miniaturization of the laser/infrared dual-mode seeker imaging system and simplify the optical structure, a dual-mode common optical path annular aperture ultrathin imaging system with four reflections is designed. The design principle of the optical splitting path of the system is studied, and the relationship between the obscuration ratio and the field of view is given. The long-wave infrared(LWIR) 7.7-9.5 μm and laser 1.064 μm dual-mode seeker imaging system is realized by a single optical element. The focal length of the dual-mode annular aperture system in the LWIR is 70 mm, the equivalent F number is 1.3, and the full field of view is 8°. The modulation transfer function(MTF) values of each field of views are greater than0.136 when the spatial frequency is 41.7 lp/mm. The focal length of the dual-mode annular aperture system at the laser wavelength is 53.8 mm, the equivalent F number is 1, the full field of view is 10°, and the spot diagram in the full field of view is uniform. When the ambient temperature ranges from -40 ℃ to 80 ℃, the MTF value of each field of view is greater than 0.13 in the LWIR, and the energy distribution is basically unchanged in laser wavelength. As a result, the optical passive athermalization is realized. According to the tolerance results, this system is machinable.
作者
谢亚峰
朴明旭
唐金力
赵渊明
连文泽
范杰平
张博
Xie Yafeng;Piao Mingxu;Tang Jinli;Zhao Yuanming;Lian Wenze;Fan Jieping;Zhang Bo(The 27th Research Institute of China Electronic Technology Group Corporation,Zhengzhou 450047,China;Changchun University of Science and Technology,Changchun 130022,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第2期392-399,共8页
Infrared and Laser Engineering
基金
国家自然科学基金(62105041)
吉林省教育厅项目(JJKH20220741KJ,JJKH20220748KJ)。
关键词
光学设计
双模导引头成像系统
环形孔径
非球面
optical design
dual-mode seeker imaging system
annular aperture
aspheric
