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Uncertainty analysis for CCD-augmented CASI® BRDF measurement system
Optical Engineering ( IF 1.3 ) Pub Date : 2021-11-01 , DOI: 10.1117/1.oe.60.11.114101
Todd V. Small 1 , Samuel D. Butler 1 , Michael A. Marciniak 1
Affiliation  

This work presents a measurement uncertainty analysis for a system designed to simultaneously capture specular in-plane and out-of-plane bidirectional reflectance distribution function (BRDF) data with high spatial resolution by augmenting the Complete Angle Scatter Instrument (CASI®) with a charge-coupled device (CCD) camera. Various scatter flux, incident flux, scatter angle, and detector solid angle uncertainty contributions are considered and evaluated based on imperfectly known system parameters. In particular, incident flux temporal fluctuation, detector noise and non-linearity, and out-of-plane aperture misalignment considerations each require significant adjustment from original CASI® uncertainty analysis, and expressions for neutral density (ND) filter, scatter angle, and solid angle uncertainties each require new formulations. Ultimately, ND filter uncertainty produces the largest contribution for the augmented system—at least when using unrefined worst-case tolerances—followed by solid angle uncertainty and pixel non-linearity. Total BRDF uncertainty and its contributing terms are compiled for several measurement scenarios, and compared with those from original analyses for single-pixel detectors. In particular, when ND filter uncertainty can be ignored or mitigated, total BRDF uncertainty values are comparable to those for the original system.

中文翻译:

CCD 增强 CASI® BRDF 测量系统的不确定度分析

这项工作提出了一个系统的测量不确定性分析,该系统旨在通过使用电荷增强完全角散射仪 (CASI®) 来同时捕获具有高空间分辨率的镜面内和面外双向反​​射分布函数 (BRDF) 数据。 -耦合设备(CCD)相机。各种散射通量、入射通量、散射角和探测器立体角不确定性贡献都基于不完全已知的系统参数进行考虑和评估。特别是,入射通量时间波动、探测器噪声和非线性以及平面外孔径未对准的考虑均需要对原始 CASI® 不确定性分析以及中性密度 (ND) 滤波器、散射角和固体的表达式进行重大调整每个角度的不确定性都需要新的公式。最终,ND 滤光片不确定性对增强系统的贡献最大——至少在使用未改进的最坏情况容差时——其次是立体角不确定性和像素非线性。总 BRDF 不确定性及其贡献项针对几种测量场景进行编译,并与单像素探测器的原始分析进行比较。特别是,当可以忽略或减轻 ND 滤波器的不确定性时,总 BRDF 不确定性值与原始系统的值相当。并与对单像素探测器的原始分析进行比较。特别是,当可以忽略或减轻 ND 滤波器的不确定性时,总 BRDF 不确定性值与原始系统的值相当。并与对单像素探测器的原始分析进行比较。特别是,当可以忽略或减轻 ND 滤波器的不确定性时,总 BRDF 不确定性值与原始系统的值相当。
更新日期:2021-11-02
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