一种新的红外连续变焦系统无热化设计方法  

Athermalization design of infrared continuous zoom system

作　　者：彭晴晴[1] 杨加强[1] 张兴德[1] 李荣刚[1] 刘琳[1] 孙昌锋[1] PENG Qing-qing YANG Jia-qiang ZHANG Xing-de LI Rong-gang LIU Lin SUN Chang-feng(North China Research Institute of Electro-optics, Beijing 100015 ,China)

机构地区：[1]华北光电技术研究所,北京100015

出　　处：《激光与红外》2017年第1期81-86,共6页Laser & Infrared

摘　　要：针对红外连续变焦系统受温度影响导致变焦曲线变化、调焦补偿复杂等问题,分析了温度变化时系统各组件的相互关系,提出一种新的无热化方法,通过变倍组和补偿组的局部无热化设计,使系统仅通过变倍组和补偿组的线性平移就能对温度影响进行补偿,变焦曲线不需改变,降低了调焦机构的控制难度。采用该方法设计了12倍中波红外连续变焦系统,通过局部无热化设计,仅通过一组变焦曲线以及随温度的线性平移,实现在25~300 mm焦距范围、-45~50℃的全温度范围在30 lp/mm的MTF在0.3左右,接近衍射极限水平。具有连续变焦、高变倍比、变焦曲线无热化、分辨率高、结构简单、控制系统简化等优点。The influence of the temperature on infrared continuous zoom system will lead to the change of zoom curve and complex focusing compensation, so an athermalization method is presented through analyzing the relationship of every component in the system when temperature changes. Through local athermalization design of zooming group and compensation group, the temperature influence can be compensated by linear shift of zooming group and compensation group without changing the zoom curve,which reduces the controlling difficulty of focusing mechanism. A mid-infrared continuous zoom optical system with 12 zoom ratio is designed by this local athermalization method. Only using one zoom curve, the MTF of about 0. 3 at 30 lp/mm is achieved when focal length range is from 25 mm to 300 mm and all the temperature range is from -45℃ to 50℃, which nears the diffractive limit. The system has the advantages of continuous zoom, high zoom ratio, zoom curve athermalization, high image quality, simple structure and so on.

关 键 词：局部无热化 高变倍比 连续变焦 曲线无热化 

分 类 号：TN219[电子电信—物理电子学]