研究了双波段/双视场红外光学系统的设计，设计了双波段/双视场红外光学系统，引入衍射光学实现双波段成像，采用移动单个透镜实现视场切换。结果表明，该系统可以实现焦距为37mm/100mm，工作波段为3.7～4.3 μm/8～12 μm 的双波段/双视场光学系统，F 数为1.2，在空间频率20 lp/mm处的光学传递函数值＞0.5。应用结果表明，该系统结构简单，像质好。

The optical design and properties of dual-band/dual-filed optical system were studied and a IR dual-filed lens optical system is presented, Introducing diffractive optical elements to realize two bands imaging with a single lens to switch the filed of view. The design result show that this system can realize 37 mm/100 mm dual-filed at the wavelength range of 3.7～4.3 μm/8～12μm，and the F number is 1.2. The results show that the system has the advantages of simplicity．Its imaging quality very well, so that its modulated transferfunction value is higher than 0.5 at the 20 lines/mm spatial frequency in the image plane.