应用光学, 2012, 33 (6): 1133, 网络出版: 2012-12-31
轻量化超宽温度折/衍混合红外热像仪光学系统设计
Lightweight and wide temperature range design of hybrid refractive/diffractive IR thermal imager
摘要
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 μm~4.8 μm, 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 μm、像元数256×256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。
Abstract
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.
王洪伟, 王彩铃, 张殿富. 轻量化超宽温度折/衍混合红外热像仪光学系统设计[J]. 应用光学, 2012, 33(6): 1133. WANG Hong-wei, WANG Cai-ling, ZHANG Dian-fu. Lightweight and wide temperature range design of hybrid refractive/diffractive IR thermal imager[J]. Journal of Applied Optics, 2012, 33(6): 1133.