杂散光是影响光学系统成像质量的重要因素之一,因此对杂散光的分析与抑制成为现代红外光学系统设计过程中的一个重要环节。根据杂散光抑制要求,确定了天基红外成像光学系统的结构形式;分析了系统存在的杂散光源,计算了系统点源透过率(PST)须满足的条件;设计并分析了遮光罩、挡光环、遮光板、光阑和消杂散光材料等杂散光抑制方法;在杂散光分析软件Trace Pro中建立系统模型,分别对系统内部及外部杂散光进行分析,计算并绘制了PST曲线。结果表明,系统内部杂散光为1.53×10-3W/m2,系统外部杂散光PST曲线整体为下降趋势,PST在离轴角度为±3°时达到10-3~10-5,系统对杂散光的抑制能力完全满足成像质量要求。 Stray light is one of the important factors affecting the imaging quality of optical system. Therefore, the analysis and suppression of stray light become an important link in the design of modern infrared optical system. According to the requirements of stray light suppression, the structure of space-based infrared imaging optical system was determined. The stray light source existed in the system was analyzed and the condition of point source transmittance (PST) of the system was satisfied. The design and analysis of the light- Stop the light ring, the visor, the diaphragm and the stray light stray light suppression method; Stray light analysis software Trace Pro to establish a system model, respectively, the system of internal and external stray light analysis, calculated and plotted PST curve. The results show that the internal stray light is 1.53 × 10-3W / m2, the external stray light PST curve is in descending trend, while the PST reaches 10-3 ~ 10-5 when the off-axis angle is ± 3 °. The stray light The ability to suppress completely meet the imaging quality requirements.