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Instrument to measure the bidirectional reflectance distribution function of surfaces

机译:测量表面双向反射率分布函数的仪器

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摘要

A new instrument to measure the in situ bidirectional reflectance distribution function (BRDF) of surfaces is described. This instrument measures the BRDF for eight illumination angles from 0 to 65 deg, three colors (475, 570, and 658 nm), and at over 100 selected viewing angles. The viewing zenith angles range from 5 to 65 deg, and the azimuth angles, relative to the illumination direction, range from 0 to ±180 deg. Many tests of the system have been run and show that for flat surfaces the BRDF of a sample surface can be measured with a precision of 1-5% and an accuracy of 10% of the measured reflectance. The BRDF for a dry and wet sand sample is presented as a demonstration of the instrument.
机译:描述了一种测量表面原位双向反射率分布函数(BRDF)的新仪器。该仪器可在0至65度的八个照明角度,三种颜色(475、​​570和658 nm)以及超过100个选定的视角下测量BRDF。观察天顶角在5到65度之间,相对于照明方向的方位角在0到±180度之间。已经对该系统进行了许多测试,结果表明,对于平坦表面,可以以所测反射率的1-5%的精度和10%的精度来测量样品表面的BRDF。展示了用于干湿砂样品的BRDF,作为仪器的演示。

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