凝视型红外光学系统中的冷反射现象

Narcissus effect in staring infrared optical system

近年来随着红外技术的长足发展,各种红外装置已广泛的应用在国防、工业、医疗等领域.随着应用的推广,对红外光学系统提出了越来越高的要求,需要对红外系统本身做进一步的研究.评价和计算这类红外光学系统的技术指标,最重要的是:系统的 MTF;弥散斑;那喀索斯效应(Narcissus effect,俗称冷反射现象)的评价.红外光学系统根据工作方式可分为扫描型和非扫描型(凝视型).根据—般的常识认为,非扫描型红外光学系统的冷反射效应可以通过系统的非均匀校正来消除,然而,实际的热成像设备总是工作在一定的振动环境下,在这种环境下,凝视型红外系统的冷反射现象就需要进行重新的评价.文中通过实例分析了凝视型红外系统中的冷反射现象以及控制方法。

Nowadays,infrared technology is applied in many fields such as industry medical equipment and national defense.Therefore,optical system must have perfect image quality.Infrared optical system can be sorted to scan type or staring type by work mode.For general knowledge,Narcissus effect in no scan system can be eliminable by NUC.However,The thermal equipment may be operated in vibration condition.In thus environment,Narcissus effect needs to do a newly evaluation.This article describes the narcissus effect in staring infrared optical system,and analyzes it by example.Moreover,it also gives the methods to avoid this phenomenon.Finally,it lists the simulating results by optical design software CODE V.