针对现代最先进的像元尺寸为15 μm、像元数640×480的中红外焦平面大面阵探测器, 设计了一种全球面轻小型高分辨率温度自适应夜视成像系统, 系统工作波段为3~5 μm, 全视场角为8.58°, 相对孔径为1/2, 焦距为80 mm, 四片式结构, 使用锗、硒化锌和硅三种材料, 系统采用全球面结构, 避免了以往该种系统中使用衍射面或非球面, 大大降低了加工检测难度且成本低。设计结果表明, 该高分辨率温度自适应夜视成像系统具有结构简单、体积小、分辨率高、成像质量高等特点, 满足设计要求, 可用于机载光电探测和跟踪系统。

A set of airborne high-resolution all-sphere midwave infrared optical system was designed based on the advanced staring focal plane array which had a format of 640×480 and the pixel pitch of 15 μm. The working wavelength is in 3-5 μm, the full field of view is 8.58°, the relative aperture is 1/2, and the efficient focal length is 80 mm. The optical system adopted four lenses with three kinds of material-Ge, ZnSe and Si. All surfaces are spherical, instead of the diffractive surface and aspheric surface used in traditional systems, and it is more easy to process and test. The design results prove that, the midwave infrared optical system has compact structure, small volume, high resolution, and excellent image quality, meeting the design requirements, and it could be used in airborne photoelectric detection and tracking systems.