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On Two Numerical Techniques for Light Scattering by Dielectric Agglomerated Structures.

Akhlesh Lakhtakia1, George W Mulholland2

  • 1Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802.

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|January 6, 2017
PubMed
Summary

This study shows that the method of moments and coupled dipole moment methods are equivalent for analyzing soot sphere light scattering. Finite sphere size effects on smoke agglomerate scattering were numerically explored.

Keywords:
agglomeratescoupled dipolc methodlight scatteringmethod of momentssmoke

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Area of Science:

  • Physics
  • Atmospheric Science
  • Materials Science

Background:

  • Smoke agglomerates, composed of soot spheres, significantly influence light scattering.
  • Understanding light scattering is crucial for fire research and atmospheric modeling.

Purpose of the Study:

  • To demonstrate the equivalence of the method of moments and coupled dipole moment methods for light scattering.
  • To numerically investigate the impact of primary sphere size on smoke agglomerate scattering properties.

Main Methods:

  • Derivation of the method of moments and coupled dipole moment methods from Maxwell's equations.
  • Numerical simulation of light scattering by smoke agglomerates.

Main Results:

  • The method of moments and coupled dipole moment methods yield equivalent results for theoretical scattering studies.
  • The finite size of primary soot spheres demonstrably affects the overall light scattering response of agglomerates.

Conclusions:

  • The equivalence of these two numerical techniques simplifies theoretical scattering analysis.
  • Accurate modeling of smoke agglomerate light scattering requires consideration of primary sphere dimensions.