折衍射混合中波红外连续变焦光学系统设计

Optical Design of Hybrid Refractive / Diffractive Mid-infrared Continual Zoom System

设计了一种基于机械补偿式大变倍比折衍射混合中波红外连续变焦光学系统。光学系统的焦距为50mm到600mm,变倍比为12:1。系统的变焦曲线平滑,图像可一直保持清晰,系统的MTF达到了衍射极限。这种折衍射混合连续变焦光学系统具有好的成像质量、灵巧的变倍机构,因此在高性能红外热像仪中得到广泛应用。

In this paper,a big zoom ratio hybrid refractive / diffractive mid- infrared continual zoom system with mechanical compensated zoom lens has been designed. The focal length of this zoom system is from 50 to 500 mm with a zoom ranger of 12： 1. The MTF of the all focal length is optimized,and the zoom curve of the zoom system is smoothed,the quality of the zoom system can be retained good imagine with the zoom ranger of 10： 1. The continual zoom system has good quality,small volume,smart mechanism. So it can be used in the high thermal imager widely.