讨论具有多个挡光环的漫射这光筒的等效反射率.在比较了文献中已介绍的几种等效反射率之后，提出了一种更为合理的算法，它不仅考虑了挡光环边缘的直接散射和衍射，同时也考虑了为提高杂光估计可靠性作遮光筒分块计算时挡光环结构的实际影响.并用实例计算作了比较.

In this paper, the equivalent reflectance of diffusive baffles with vanes is discussed. After comparing several equivalent reflecamces introduced in literatures, a more appropriate model is proPOSed, in which not only the scattering and diffraction from vanes edge but also the influences of the segmentation of baffle are considered.