DIFFUSE-REFLECTANCE SPECTROSCOPY OF PARTICULATE SYSTEMS - A COMPARATIVE-STUDY OF DISCRETE MODELS

A comparative study of statistical particle model theory of diffuse re flectance has been made. Theories have been applied to six particulate samples having different optical characteristics and average particle sizes that vary from 42 to 106 mu m. We made an overall assessment of each theoretical model by determining the CIELAB color difference usi ng experimentally measured and theoretically predicted diffuse reflect ance spectra in the visible spectral range. We discuss the performance ratings of the models of other researchers and discovered numerous ty pographical errors in Fresnel reflection coefficient expressions. We p rovide the correct versions for these expressions. (C) 1997 Optical So ciety of America.