超长焦距红外双视场光学系统设计

设计了一种超长焦距中波红外双视场光学系统，该系统采用二次成像结构，通过透镜轴向移动实现变焦功能。设计结果表明，该系统可以实现超长焦距600~150 mm的变焦功能，且中心视场在探测器特征频率20 lp/mm处的光学传递函数值高于0.5，接近衍射极限，能够很好地满足军事侦察对远距离目标同时搜索和瞄准的要求。

Design of infrared optical system with super-long focal length and dual field-of-view

A mid-wavelength infrared optical system with super-long focal length and dual field-of-view is de-signed in this paper .Based on the re-image configuration , this system can realize the zoom by axial motion of a lens along the optical axis .The design results show that this system realizes the zoom with a super-long focal length of 600-1500 mm, and the MTF of the central view is more than 0.5 at the characteristic frequency of 20 lp/mm of detector , which shows its optical performance approximates to the diffraction limit .This system can meet the requirement of military investigation for seeking and aiming at target in a long distance .