Interactions of light with rough dielectric surfaces - Spectral reflectance and polarimetric propertiesThe nature of the interactions of visible and NIR radiation with the surfaces of rock and mineral samples was investigated by measuring the reflectance and the polarization properties of scattered and reflected light for slab samples of obsidian and fine-grained basalt, prepared to controlled surface roughness. It is shown that the degree to which radiation can penetrate a surface and then scatter back out, an essential criterion for mineralogic determinations based on reflectance spectra, depends not only upon the composition of the material, but also on its physical condition such as sample grain size and surface roughness. Comparison of the experimentally measured reflectance and polarization from smooth and rough slab materials with the predicted models indicates that single Fresnel reflections are responsible for the largest part of the reflected intensity resulting from interactions with the surfaces of dielectric materials; multiple Fresnel reflections are much less important for such surfaces.
Document ID
19890023528
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Yon, S. A. (Brown Univ. Providence, RI, United States)
Pieters, C. M. (Brown University Providence, RI, United States)