本文件提供了使用分光光度计测量平面表面光谱反射率和平面平行元件光谱透射率的规则。 本文件仅适用于规则透射率和规则反射率的测量；它不适用于漫透射比和漫反射比。 本文件适用于无光功率的有涂层或无涂层光学元件的试样。

This document provides rules for the measurement of the spectral reflectance of plane surfaces and the spectral transmittance of plane parallel elements using spectrophotometers. This document only applies to measurements of the regular transmittance and the regular reflectance; it does not apply to those of the diffuse transmittance and the diffuse reflectance. This document is applicable to test samples, which are coated or uncoated optical components without optical power.