一种用于目标探测跟踪的红外变焦系统设计

摘要

针对军用装备目标探测的应用需求，设计了一种15倍非制冷式红外变焦系统。该变焦系统工作于8～12μm远红外波段， F数为3，在20～300 mm范围内系统能够连续变焦且像质较好，在最大截止频率为11 lp/mm时，各焦距位置的MTF曲线与衍射极限十分接近。在长焦距、大变倍比的前提下，结构依然紧凑，总长度有效控制在330 mm。在给定公差范围内，像质变化满足实际应用允许的变化范围。最后，该系统与联合变换相关器相结合，完成了对目标的探测实验。实验结果表明，该红外变焦系统能够很好地探测识别目标。%According to the requirements of the military equipments towards targets detecting and tracking , an uncooled infrared optical zooming system with a zoom ratio of 15 is designed .The zooming sys-tem works in the far IR region of 8~12μm with F number of 3.This system can realize continuous zooming between 20~300 mm, and the MTF curves are close to the diffraction limitation at every focal position when the spatial frequency is 11 lp/mm.Under the circumstance of long focal length and large zoom ratio , the system achieves a compact structure , and the total length is less than 330 mm.The changes of image quality can be satisfied according to the tolerance confinement of practical applications .At last ,a detecting experi-ment is accomplished using the zooming system combined with the joint transform correlator .The experi-mental results show that the infrared zooming system can recognize the target excellently .