Comparisons of bidirectional reflectance distribution function measurements on prepared participate surfaces and radiative-transfer models

Hao Zhang, Kenneth J. Voss

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

To understand the connection between single-particle optics and the optics of a closely packed surface, controlled laboratory measurements of bidirectional reflectance distribution functions on layers of polymer and glass spheres are carried out. The measurements are compared with predictions from five radiative-transfer models; the Hapke's models, the Lumme-Bowell model, the BRF algorithm of Mishchenko et al., and the discrete ordinate radiative transfer. It is found that models of strict numerical radiative-transfer equations (RTEs) predict measurements well in some regions but have errors in both forward- and backward-scattering directions. The improved Hapke's model, although it has an anisotropic multiple-scattering term, still produces considerable errors compared with the strict RTE. The difference can be attributed to the exclusion of a diffraction contribution in the Hapke model.

Original languageEnglish (US)
Pages (from-to)597-610
Number of pages14
JournalApplied Optics
Volume44
Issue number4
DOIs
StatePublished - Feb 1 2005

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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