Abstract

By means of geometrical optics we present an approximation algorithm with which to accelerate the computation of scattering intensity distribution within a forward angular range (0 - {60 - ) for gradient-index particles illuminated by acollimated ted incident beam. The incident angle of the re∞ected light is derived from the scattering angle to improve the approximation precision. This method proves efiective for transparent particles with size parameters larger than 75 but fails to give good approximation results at scattering angles at which refractive rays are absent. With the given index model, the geometrical optics approximation is efiective only for forward small angles, typically less than 10 - or so when the refractive index difierence of a particle is greater than a certain value. DOI: 10.2529/PIERS061023013549

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