Surface Characterization Using Scattering Measurement Instrument

Abstract

The main goal is to test and compare measurement instruments to determine scattering characteristic of diffuse and specular samples through BRDF measurement. The scattering characteristics depend on the respective surface condition. The Bidirectional Scattering Distribution Function (BSDF) gives a relation between scattered radiance and incident radiance depending on all incident directions. That is why it was called bidirectional. Radiance is defined as a flux of radiation emitted per unit solid angle in each direction by a unit area of source. Two instruments were used to get the BRDF measurement of 5 samples are gonio spectrometer REFLET-180 and scatterometer MiniDiff. The BSDF measurement results of both equipment are compared in term of repeatability of the scatter profile.