gonioreflectometry
Gonioreflectometry is the measurement of how light is reflected from a surface as a function of the geometry of illumination and observation. It characterizes the angular distribution of reflected light, typically in terms of the bidirectional reflectance distribution function (BRDF), which describes how reflectance varies with incident and viewing directions. The technique is used for materials characterization, optical engineering, and computer graphics, among other fields.
In a typical gonioreflectometric setup, a light source projects a beam onto the sample at a specified
Data from gonioreflectometry are often analyzed by fitting physical or semi-empirical reflectance models, or by extracting
Equipment typically includes a motorized goniometer or turntable, a controllable light source, a detector or spectroradiometer,