针对制冷型320×256双色焦平面阵列探测器, 设计了一套双波段红外光学系统, 用于机载光电探测设备。光学系统采用锗、硒化锌和硫化锌组合实现了无热化设计; 通过引入非球面和谐衍射元件, 很好地校正了系统的色差和轴外像差, 简化了系统结构。光学系统仅由6片镜子构成, 工作波段为3.7~4.8 μm /7.7~9.5 μm波段, F数为2, 满足100%冷光阑效率。像质评价结果表明, 光学系统在-60～+70 ℃全温度范围内, 双波段成像质量良好。

A set of dual-wavelength infrared optical system was designed for airborne photoelectric detection equipment, based on dual-wavelength 320×256 element cooled thermal IR focal plane arrays (FPA) detector.The system adopts the combination of three kinds of material of Ge, ZnSe and ZnS to achieve athermalization design.By introducing harmonic diffractive surface and aspheric surface, the chromatic aberration and the off-axis aberration are well corrected, and the system structure is simplified.The system, working in the wave band of 3.7~4.8 μm /7.7~9.5 μm and with the F/number of 2, is consisted of 6 elements, and has 100% cold shield efficiency.The image quality evaluating results show that: the performance of the dual-wavelength infrared optical system is very well in at temperature from -60 ℃ to +70 ℃.