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Comparisons between geometrical optics and Lorenz-Mie theory.

A Ungut, G Grehan, G Gouesbet

|March 25, 2010

Summary

This study compares Lorenz-Mie and geometrical optics theories for light scattering by transparent particles. Geometrical optics provides accurate forward scattering predictions for particle sizing and velocimetry.

Area of Science:

Optical Physics
Particle Characterization
Fluid Dynamics

Background:

Accurate measurement of particle size and velocity is crucial in various scientific fields.
Scattering of light by particles is a common method for particle characterization.
Existing theories for light scattering have limitations in specific angular ranges.

Purpose of the Study:

To compare Lorenz-Mie theory and geometrical optics theory for light scattering.
To assess the accuracy of geometrical optics in forward scattering angles.
To evaluate methods for simultaneous particle sizing and velocimetry.

Main Methods:

Calculations of scattered light patterns using Lorenz-Mie theory.
Calculations of scattered light patterns using geometrical optics theory.

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Comparison of theoretical results for particles (1-100 microm) and forward scattering angles (0-20 degrees).

Main Results:

Geometrical optics theory shows high accuracy for forward scattering angles.
The study provides a definitive assessment of geometrical optics theory's applicability.
Pedestal calibration methods are emphasized for simultaneous sizing and velocimetry.

Conclusions:

Geometrical optics is a reliable and accurate method for forward light scattering analysis.
The findings support the use of geometrical optics for particle sizing and velocimetry.
Accurate forward scattering predictions enable advanced particle measurement techniques.