本文件规定了涂层和未涂层光学表面总散射的测定程序。给出了测量前向散射或后向散射对光学元件总散射贡献的程序。 本文件适用于光学表面曲率半径大于10 m的涂层和未涂层光学元件。本文件涵盖的测量波长范围从250 nm以上的紫外线到15µm以下的红外光谱区域。对于190 nm至250 nm之间的深紫外测量，考虑并描述了具体方法。通常，对于15µm以上的波长，光散射被认为是可以忽略的。

This document specifies procedures for the determination of the total scattering by coated and uncoated optical surfaces. Procedures are given for measuring the contributions of the forward scattering or backward scattering to the total scattering of an optical component. This document applies to coated and uncoated optical components with optical surfaces that have a radius of curvature of more than 10 m. Measurement wavelengths covered by this document range from the ultraviolet above 250 nm to the infrared spectral region below 15 µm. For measurements in the deep ultraviolet between 190 nm to 250 nm, specific methods are considered and are described. Generally, optical scattering is considered as neglectable for wavelengths above 15 µm.