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为降低陆基红外探测系统遮光罩自身辐射的大小,提出一种遮光罩优化设计方法。该方法将传统遮光罩的一级消光部分设计为多组相互垂直的反射面,入射到反射面上的杂散辐射光线被反向反射出遮光罩,外部杂散光得到抑制;同时,因为反射面热辐射率低,减小了由于遮光罩自身辐射引起的杂散光。详细介绍了遮光罩的优化设计方法,并结合实例使用TRACEPRO软件进行建模与仿真,计算了优化后遮光罩的PST值和自身热辐射大小。分析结果表明,与传统的遮光罩相比,优化后的遮光罩自身热辐射降低一个数量级,且其PST大小能够满足陆基红外探测系统外部杂散辐射的抑制水平。
In order to reduce the size of radiation of land-based infrared detection system hood, a method of optimal design of hood is proposed. In the method, the first-order extinction part of a traditional light shade is designed as a plurality of groups of mutually perpendicular reflection surfaces, and the stray radiation light incident on the reflection surface is reversely reflected out of the light shade and the external stray light is suppressed; meanwhile, because the reflection surface Low thermal emissivity, reducing stray light due to the hood’s own radiation. In this paper, the optimal design method of the sun visor is introduced in detail. The TRACEPRO software is used in the modeling and simulation with examples to calculate the PST value and self-radiant heat radiation size of the optimized sun visor. The analysis results show that compared with the traditional hood, the heat radiation of the optimized hood is reduced by an order of magnitude, and the PST size can satisfy the suppression level of the external stray radiation of the ground-based infrared detection system.