Approximation of the light scattering cross section for aggregated non absorbent spherical particles
Résumé
We present in this article a comparison of the light scattering cross-section obtained by using exact calculations (GMM
code computed by Xu) and several approximated methods such as the Compact Sphere (CS), Anomalous Diffraction
(AD), Effective Refractive Index (ERI) and Percival–Berry–Khlebtsov (PBK). We carry this out, for different shapes of
aggregate (i.e. compact and linear configuration) consisting of different numbers of primary particles (2, 4, 8, 16, 64, 100).
We study it as a function of a size parameter of the primary particles in the range from 0 to 10 and as a function of the type
of materials (SiO2, Al2O3, TiO2).
We present the validity range of these approximated methods and conclude that ERI is the most promising one for all
the ranges of size parameter (i.e. the average error of this method is, compared to the exact method, around 3% for a
compact configuration).
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