Abstract

By performing bidirectionnal reflectance distribution function (BRDF) measurements, we have identified backscattering as the main phenomenon involved in the appearance of dry nanocrystallized powders. We introduce an analytical and physically based BRDF model that relies on the enhanced backscattering theory to accurately reproduce BRDF measurements. These experimental data were performed on optically thick layers of dry powders with various grains’ morphologies. Our results are significantly better than those obtained with previous models. Our model has been validated against the BRDF measurements of multiple synthesized nanocrystallized and monodisperse $\alpha {-} {{\rm Fe}_2}{{\rm O}_3}$ hematite powders. Finally, we discuss the ability of our model to be extended to other materials or more complex powder morphologies.

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