【摘要】 基于制冷型320×240凝视焦平面阵列探测器,设计了30×中波红外大倍率连续变焦光学系统。详细介绍了连续变焦光学系统的选型及其初始结构的计算方法。系统采用硅和锗两种普通红外材料,通过引入非球面校正系统轴外像差,实现了30～900mm的连续变焦,F数为4,工作波段为3.7～4.8μm,满足100%冷光阑效率,在空间频率为16 lp/mm处,系统MTF值大于0.5。系统具有变倍比大,结构紧凑,光学总长短和全焦距范围内像质好,分辨率高等优点,满足设计要求。更多还原

【Abstract】 On the basis of a cool 320×240 detector with staring focal plane array,a set of 30× middle infrared continuous zoom system was designed.The structural selection and the initial parameter calculation were introduced in detail.Two common infrared materials of Si and Ge were used.To correct off axis aberration,aspheric was accepted.The design results prove that the system works at 3.7-4.8 μm,achieving the zoom of 30-900 mm,large zoom ratio of 30× and F number of 4.At the spatial frequency of 16 lp/mm,the system′s MTF value is greater than 0.5.The system can offer a high resolution and excellent images in whole range of the focal length,and its cold shield efficiency is 100%.And it has the advantages of a large zoom ratio,compact structure and short optical length.The system satisfies the design requirements.更多还原