【摘要】 介绍了一种新颖变焦双视场长波红外光学系统设计实例,适用于制冷型320×256凝视焦平面探测器。通过变倍组在一次像面前后移动实现变焦,同时实现近处景物调焦和温度补偿。该系统仅由5片透镜组成,可实现焦距为183 mm/61 mm两档变焦,工作波段为7.7～9.3μm,F/数为3,满足100%冷光阑效率。具有变焦新颖、结构紧凑、像质高、透过率高、成本低等优点。更多还原

【Abstract】 A novel step-zoom LW Infrared dual field-of-view optical system based on cool 320×240 staring focal plane array(FPA) is designed.The zoom group is moved through intermediate image plane to realize the dual field-of-view,also used for focusing at near objects and for athermalization by small axial movement.The system consist of only five lenses,and can realize 183 mm/61 mm dual field-of-view at the spectrum region of 7.7～9.3 mm and the F number of 3,which can obtain the cold shield efficiency of 100 %.The design result shows that the system has the advantages of step-zoom,compact structure,excellent image quality,high transmission and low cost.更多还原