Approximate analytical effective phase function obtained for a thin slab geometry
| Autor: | Fabrice Vaudelle |
|---|---|
| Přispěvatelé: | Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Monte Carlo method Phase (waves) Sciences de l'ingénieur 01 natural sciences 010309 optics [SPI]Engineering Sciences [physics] Optical path Optics Atomic and Molecular Physics 0103 physical sciences Anisotropy Spectroscopy 0105 earth and related environmental sciences Physics Radiation Scattering business.industry Atomic and Molecular Physics and Optics Computational physics Reflection (physics) Slab and Optics business Analytic function |
| Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2017, 193, pp.47-56 |
| ISSN: | 0022-4073 |
| Popis: | International audience; The reflection and transmission of light from a slab containing a turbid medium provide a scattering effective phase function from which the true optical anisotropy factor may not be always easily retrieved. From the statistical Poissonian theory and thanks to approximations about the optical path related to the first scattering events, a simplified relationship is established between angular phase function and effective phase function. Therefore, with a modified Gegenbauer or a Two-Terms Henyey-Greenstein phase function, some adjustable analytic functions are proposed in order to fit the measurements linked to the true effective phase function. An efficiency of the approximate analytical function is proved, thanks to the light modelling by Monte Carlo method, for optical thickness lower or equal to 2. This is confirmed by comparisons of the anisotropy retrieval with other methods. Concerning applications, several fits were made on experimental effective phase functions corresponding to goniometric measurements from usual diffusing materials and biological tissues. |
| Databáze: | OpenAIRE |
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