Scattering and absorption in dense discrete random media of irregular particles

被引：19

作者：

Markkanen, J. ^{[1
,2
]}

Vaisanen, T. ^{[1
]}

Penttila, A. ^{[1
]}

Muinonen, K. ^{[1
,3
]}

机构：

[1] Univ Helsinki, Dept Phys, POB 64,Gustaf Hallstrokim Katu 2a, FI-00014 Helsinki, Finland

[2] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[3] Natl Land Survey Finland, Finnish Geospatial Res Inst FGI, Geodeetinrinne 2, FI-02430 Masala, Finland

来源：

OPTICS LETTERS | 2018年 / 43卷 / 12期

基金：

欧盟地平线“2020”;

关键词：

MONTE-CARLO SIMULATIONS; INCOHERENT INTERACTIONS; MULTIPLE-SCATTERING; EQUATIONS; SNOW;

D O I：

10.1364/OL.43.002925

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present an approximate numerical solution for the multiple scattering problem involving densely packed arbitrarily shaped small particles. We define incoherent volume elements that describe the statistics of the random medium and formulate an order-of-scattering solution for the entire random medium. We apply the T-matrix formalism to compute the incoherent interactions of irregular particles in the sequence of scattering events in the Monte Carlo radiative transfer algorithm. The T-matrices for the volume elements of arbitrarily shaped particles are computed by the volume-integral-equation (VIE)-based T-matrix method. We show that the approximate solution is in agreement with the numerically exact VIE solution for a small spherical random medium. Finally, we demonstrate the importance of applying irregular particle shape models in the analysis of multiple scattering by a large random medium of non-spherical particles. (C) 2018 Optical Society of America

引用

页码：2925 / 2928

页数：4

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