红外反远距光学系统的小型化设计

Miniaturization design of infrared inverted telephoto optical system

设计了一大视场短筒长的红外反远距物镜。针对红外物镜的特点,对反远距物镜进行高斯光学分析,找出进一步小型化的途径;根据探测器参数,提出了光学系统的参数,焦距10mm,F/#为1.2,视场60°。实例方案中,光学结构采用4片硅片,2个二次曲面;光学系统长度小于57 mm,外径小于24 mm,利用内调焦及充足的调焦范围,使光学系统在-40℃～60℃的工作温度范围内全视场调制传递函数曲线在截止频率处大于0.45;设计系统体积小,视场大,成本低,便于机械安装,环境使用范围广。

An infrared inverted telephoto objective is designed.Based on the characteristics of infrared objective,a miniaturization design is analyzed based on Gauss optics.The parameters of the optical system are given.Its focal length is 10mm,F/# is 1.2 and field of view is 60°.The system consists of 4 pieces of silicon lens and 2 second order aspheric surface,and its MTF is more than 45% at the cutoff frequency.The length of the optical system is shorter than 57 mm,and its diameter is less than 24 mm.The system is compact in size,cost effective and easy to be assembled,and it provides good performance from-40℃ to 60℃.