Modeling of Multiple Scattering Effects in Fraunhofer Diffraction Particle Size Analysis

摘要

A model for the direct problem of calculating the forward scattering signature of a multiple scattering medium is presented. The new formulation is optimized for integration into schemes for reconstructing the particle size distribution from laser diffraction (forward scattering) signatures obtained from optically thick media. The analysis is valid for media where the particle sizes and interparticle spacings are large (relative to the wavelength and the particle size, respectively) such that Fraunhofer diffraction theory adequately describes the properties of the forward scattered light from individual scattering events. The simulated performance of laser diffraction particle sizing instruments was then studied using predictions of the scattered light signatures which would be measured by laser diffraction instrumentation under multiple scattering conditions. The results were compared with experimental data and theoretical calculations based on other models. Keywords: Particle sizing, Light scattering, Inverse scattering, Multiple scattering, Laser diagnostics, Droplet sizing, Reprints. (JHD)