一种新的红外连续变焦系统无热化设计方法

发布时间：2018-03-08 10:36

  本文选题：局部无热化　切入点：高变倍比　出处：《激光与红外》2017年01期 　论文类型：期刊论文

【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。
[Abstract]:Aiming at the problems such as the change of zoom curve caused by temperature and the complexity of focusing compensation in infrared continuous zoom system, this paper analyzes the interrelation of various components of the system when the temperature changes, and puts forward a new non-thermal method. Through the local non-thermal design of the variable power group and the compensation group, the system can compensate the temperature effect only by the linear translation of the variable power group and the compensation group, and the zoom curve does not need to change. The control difficulty of focusing mechanism is reduced. Using this method, a 12 times infrared continuous zoom system is designed. By means of local non-thermal design, only one set of zoom curves and linear translation with temperature are adopted. The MTF with a full temperature range of 30 lp/mm and 50 鈩，

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