When measuring the Bidirectional Reflectance Distribution Function (BRDF) to characterize typical materials, the effect of the polarization of the light source or the dependence of the detector on the polarization is not usually considered, even though many studies have proven their impact in the uncertainty of the BRDF of most materials, including diffuse reflectance standards. A methodology to assess polarization-related effects proposed by other authors has been tested in this work for the measurement of the BRDF of four typical materials used for realizing white diffuse reflectance standards (ceramic tile, barium sulfate, Spectralon and Russian opal glass). Relative systematic error due to polarizing conditions is calculated as a combination of the instrument polarization bias and sample-based coefficients, and the impact of the proposed methodology on the uncertainty is discussed.

中文翻译：

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在双向反射分布函数的测量中考虑偏振相关的影响

在测量双向反射分布函数（BRDF）以表征典型材料时，通常不会考虑光源偏振或检测器对偏振的依赖性，尽管许多研究已经证明它们对不确定度的影响。大多数材料的BRDF，包括漫反射标准。在这项工作中，已经测试了其他作者提出的评估偏振相关效应的方法，用于测量用于实现白色漫反射标准的四种典型材料（陶瓷砖，硫酸钡，Spectralon和俄罗斯蛋白石玻璃）的BR​​DF。归因于偏振条件的相对系统误差是通过仪器偏振偏置和基于样本的系数的组合来计算的，