中文摘要：

分析了衍射光学元件在红外光学系统中的消热差特性，设计了工作于8～12μm，全视场角为6．44°的红外消热差光学系统，设计结果表明，该系统在-10℃～60℃温度范围内成像质量接近衍射极限，适用于像元尺寸为45μm的非制冷焦平面阵列探测器。

英文摘要：

The athermalism of diffractive optical element in infrared optical system is analyzed. An athermal infrared optical system at 8～ 12 μm bands, 6.44 degrees of field of view is presented. The image quality of the system approaches the diffraction limit in the working temperature range -10℃ ～60℃, the system is compatible with uncooled focal plane array with the picture clement size of 45 μm.