3～5μm波段和8～12μm波段的红外成象技术一直是国外红外成象系统发展的重点。本文简要介绍中波段(3～5μm)成象系统国外在观测、侦察、瞄准、监视、告警、跟踪、制导等方面应用,着重比较两个波段红外成象技术在远距离探测中的优缺点,给出了相对性能在各种条件下的比较曲线;大气传输、探测器性能、光学系统,对两个波段的影响;介绍了20多年 Infrared imaging technology in 3 ~ 5μm band and 8 ~ 12μm band has been the focus of the development of foreign infrared imaging system. This paper briefly introduces the applications of mid-band (3-5μm) imaging systems in the fields of observation, reconnaissance, aiming, monitoring, warning, tracking and guidance abroad. It mainly compares the advantages and disadvantages of two- The comparative curves of relative performance under various conditions are given; the influence of atmospheric transmission, detector performance, optical system on the two bands; the introduction of more than 20 years