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17 February 2012Geometrical optics approximation of light scattered by large spheroidal bubble
The light scattering properties of bubbles are very important for exploration underwater. The shape of bubbles usually
treated as spheres, are apparently nonspherical in turbulent flow. The present methods for calculating light scattered by
nonspherical particles are lack of efficient computation due to the large size of bubble, where geometrical optics
approximation is considered a better method for calculating light scattering patterns. In this paper, the large spheroidal
bubble with end-on incidence in water are researched based on ray tracing method. The angular distribution of light
scattered by prolate and oblate spheroidal bubbles are interpreted that both shapes of bubbles have strong forward and
low backward scattering with rapid ripple structure. The types of ray paths permeating the bubble are calculated to
explain the physical mechanisms that cause various prominent intensity features. The results could provide the
theoretical foundation for optimizing the turbulent bubbly flow measurements.
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Huiling He, Kecheng Yang, Wei Li, Min Xia, Qing Li, Xiaohui Zhang, "Geometrical optics approximation of light scattered by large spheroidal bubble," Proc. SPIE 8332, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging, 83320F (17 February 2012); https://doi.org/10.1117/12.918757