Geometrical optics approximation of light scattering by large air bubbles--颗粒学报PARTICUOLOGY

Yu, H., Shen, J., & Wei, Y. (2008). Geometrical optics approximation of light scattering by large air bubbles. Particuology, 6(5), 340–346. https://doi.org/10.1016/j.partic.2008.07.003

Geometrical optics approximation of light scattering by large air bubbles

Haitao Yu, Jianqi Shen^*, Yuehuan Wei

University of Shanghai for Science and Technology, Shanghai 200093, China

10.1016/j.partic.2008.07.003

Volume 6, Issue 5, October 2008, Pages 340-346

Received 12 April 2008, Accepted 9 July 2008, Available online 7 September 2008.

E-mail: shenjq@online.sh.cn

Highlights

Abstract

For large spherical bubbles in water, geometrical optics approximation is considered a better method for calculating light scattering patterns. In this paper, the basic theory of geometrical optics approximation is clarified. The change of phase for bubbles is calculated when total reflection occurs, which is different from particles with relative refractive indices larger than 1. Verification of the method was achieved by assuming a spherical particle and comparing present results to Mie scattering and Debye calculation. Agreement with the Mie theory was excellent in all directions when the dimensionless size parameter is larger than 50. Limitations of the geometrical optics approximation are also discussed.

Graphical abstract

Keywords

Geometrical optics approximation; Light scattering; Total reflection

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