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Error Analysis for BRDF Measurements at the European Goniometric Facility

机译：欧洲测角设备中BRDF测量的误差分析

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摘要

This study determines the measurement errors for laboratory bidirectional reflectance (BRDF) measurements at the European Goniometric Facility (EGO, Ispra, Italy). The average total error depends strongly o the spectral signature of the sample, varying from 4/100 to up to 14/100. The spatial illumination heterogenity is identified as the largest error source. Its effects in- Crease with increasing zenith angles. It is shown that the instrument noise of the detector SE590 (Spectron Engineering) is a function of the maximum signal in a measured spectrum. Based on this result, a procedure to define the wavelength range with acceptable measurement Errors is presented. Different ways to calculate the irradiance are compared. It is shown that Calculating a constant irradiance for each incidence angle is in better agreement with the Reciprocity principle than assuming a different irradiance for each illumination and viewing Geometry.
机译：这项研究确定了欧洲测角设备（EGO，意大利伊斯普拉，意大利）实验室双向反射率（BRDF）测量的测量误差。平均总误差在很大程度上取决于样品的光谱特征，从4/100到最高14/100不等。空间照明异质性被确定为最大误差源。其效果随着天顶角度的增加而增加。结果表明，检测器SE590（Spectron Engineering）的仪器噪声是所测频谱中最大信号的函数。基于此结果，提出了定义具有可接受的测量误差的波长范围的过程。比较了计算辐照度的不同方法。结果表明，与为每个照明和观察几何假设不同的辐照度相比，为每个入射角计算一个恒定的辐照度与互易性原理更好地吻合。

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