Chinese Optics Letters, 2009, 7 (5): 05403, Published Online: May. 22, 2009
Design and experimental research of angle self-compensation setup for BSDF measurement
BSDF 单一参考测量 角度补偿 实验分析 120.5820 Scattering measurements 220.4830 Systems design 070.4560 Data processing by optical means
Abstract
When using a single reference to measure the bi-directional scattering distribution function (BSDF), the incident zenith angle of the tested sample must be identical to that of the reference. In order to get the hemisphere space scattering characteristic on the sample surface, usually a motor drives the sample tilting, then the incident zenith angle is changed and needs to be the compensated by another motor. We mathematically deduce the expression of compensation angle when the incident zenith angle is changed by the rotation of motor. After the incident angle is compensated, the scattering zenith angle and azimuth angle are deduced too. The uncertainty of the system is 0.75%. Scattering measurements are performed on copper sample with visible light under different temperatures.
Chao Qi, Hongchen Liu, Yuanli Wei, Jingmin Dai. Design and experimental research of angle self-compensation setup for BSDF measurement[J]. Chinese Optics Letters, 2009, 7(5): 05403.