We have made bi-directional reflectance distribution function (BRDF) measurements on particulate layers wetted by absorbing liquids. The measurement results indicate that the BRDF tends to become more Lambertian as the interstitial pore liquid becomes more absorbing. The directional hemispherical reflectance, or albedo, of such a layer decreases nonlinearly with a wetting liquid's absorption coefficient. This behavior may be fit by two empirical relationships which independently treat the reflectance from the front surface and reflectance from the bulk material.
|Original language||English (US)|
|Number of pages||9|
|Journal||Journal of Quantitative Spectroscopy and Radiative Transfer|
|State||Published - Jul 1 2007|
- Ocean optics
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics