Bidirectional reflectance study on dry, wet, and submerged particulate layers

Effects of pore liquid refractive index and translucent particle concentrations

Hao Zhang, Kenneth Voss

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We performed extensive bidirectional reflectance measurements on dry, wet, and submerged particulate layers with various albedos to investigate the darkening effect caused by wetting with fluids. It was found that, in addition to the reduction of the refractive index contrast when there is a pore liquid (wetted), the concentration of translucent grains in a particulate layer and the surface roughness conditions of the individual grains make important contributions to the wetting-induced darkening effect. Reflectance measurements on glass-sediment mixtures confirmed that, as the concentration of translucent particles increases, the reflectance of the dry layers increases while that of the wetted layers decreases. Measurements indicate that neither the prediction made by the theory of Twomey et al. [Appl. Opt. 25, 431 (1986)] nor that of Lekner and Dorf [Appl. Opt. 27, 1278 (1988)] is sufficient.

Original languageEnglish (US)
Pages (from-to)8753-8763
Number of pages11
JournalApplied Optics
Volume45
Issue number34
DOIs
StatePublished - Dec 1 2006

Fingerprint

bidirectional reflectance
Reflectometers
particulates
Wetting
Refractive index
refractivity
porosity
darkening
Liquids
liquids
wetting
Sediments
Surface roughness
reflectance
Glass
Fluids
albedo
surface roughness
sediments
glass

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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