轻量化超宽温度折/衍混合红外热像仪光学系统设计

设计一个用于红外热像仪的轻量化超宽温中波折/衍混合红外热像仪光学系统。光学系统参数:工作波段为3.7 m～4.8 m，相对孔径为1/2，焦距为120 mm，全视场角为5.18，满足100 %冷光栏效率。采用三片式结构，使用硅和锗两种常用的红外材料，以及一个非球面和一个衍射面,系统实现了轻量化和超宽温度下工作。系统在-60℃～160℃温度范围内成像质量接近衍射极限,可供像元尺寸为30 m、像元数256256的凝视型中波红外探测器使用，可探测到2.3 km远的坦克目标。

Lightweight and wide temperature range design of hybrid refractive/diffractive IR thermal imager

A hybrid refractive/diffractive IR thermal imager with light weight and wide temperature range was designed. The working wavelength was 3.7 μm～4.8 μm; the relative aperture was 1/2; the efficient focal length (EFL) was 120 mm ; the full field of view was 5.18°and the system satisfied 100％ cold shield efficiency. The system was designed with three lenses and two kinds of materials-Si, Ge-and an aspheric surface and a diffraction surface to realize operation with light weight and wide temperature range. The imaging quality of the system approaches to the diffraction limit at -60℃～160℃. It is compatible with the staring mid wave infrared detector which has a format of 256×256 and the pixel pitch of 30 μm. The system can recognize the tank from 2.3 km.