Diffuse reflectance spectroscopy of particulate systems: a comparative study of discrete models

Abstract

A comparative study of statistical particle model theory of diffuse reflectance 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 mum. We made an overall assessment of each theoretical model by determining the CIELAB color difference using experimentally measured and theoretically predicted diffuse reflectance spectra in the visible spectral range. We discuss the performance ratings of the models of other researchers and discovered numerous typographical errors in Fresnel reflection coefficient expressions. We provide the correct versions for these expressions.

Physical Aspects of Color in Foods

“…Despite the stated importance of appearance in foods, it is in other more traditional color-using industries where the real optical theory advances have been made. Models exist to study all manner of heterogeneous systems from powders through to emulsions (8,9) and it is possible to effectively adapt these to use with many food products.…”