杂散辐射分析与抑制是红外探测光学系统设计的重要环节，杂散辐射增加了系统的噪声，降低了红外探测系统对目标的探测能力。首先对红外探测系统杂散辐射源进行了分析，对基于光线追迹的杂散辐射分析理论进行了介绍，并结合具体的红外探测光学系统实例，提出了反向光线追迹的思路，分析系统关键表面的特性，提出了给机械表面涂覆吸收膜的方法来抑制系统的杂散辐射，分析结果满足杂散辐射抑制的要求。

Analysis and suppression of stray radiation are significant component to infrared detection optical system design. Stray radiation will add the noise of system, and reduce the system detection ability of system on target. The stray radiation sources of infrared detection system were analyzed in this paper, and the theory of stray radiation based on ray-tracing was introduced. Then, the thought of backward ray-tracing based on an infrared detection optical system was advanced. After the characteristics of key surfaces were analyzed, the absorbing membrane of mechanical surface was introduced to suppress the stray radiation. The analysis results meet the requirements of stray radiation suppression.