1.3～5μm宽波段红外成像光学系统设计

Design of a 1.3～5μm Wide Wave Band Infrared Imaging Optical System

宽波段红外成像技术可以获取丰富的波段信息,在目标识别和频谱分析中具有独特的优势。设计了一种1.3~5μm宽波段短中波红外光学系统,该光学系统采用二次成像设计,包括7块透镜和2片反射镜,其中使用了2片硅非球面和1片硒化锌基底衍射面用以校正像差和色差。利用光学设计软件给出了系统的光学参数和二维外形结构图,并且对其像质和冷反射进行了系统分析。该系统可以实现在工作波段1.3~5μm宽波段中成像,其F数为2,满足100%冷光阑效率。该系统结构紧凑,像质较好,能够实现宽波段成像要求。

Wide-infrared imaging technology has the technical advantages in spectrum analysis and identifying target, and it can obtain plentiful wave band information. In this paper, a 1. 3-5 μm wide wave band infrared optical system is designed with a double imaging zoom structure which including 7 lens and 2 reflectors, and the color difference is cor- rected by using 2 silicon aspheric lens and 1 ZnSe diffraction lens. The modulation transfer function （MTF） curves and the cold reflection of the system are investigated by using the optical design software. The analysis results indicate that the optical system whose F is 2 can image in the 1.3-5 μm wide wave band, and the cold shield efficiency is 100% sat isfied. The structure of the designed optical system is simple and reliable, and is able to meet the design and use requirements of wide wave band imaging in a high image quality.