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Proceedings Paper

Scattering Of Laser Light From Bubbles In Water At Angles From 68 To 85 Degrees
Author(s): Dean S. Langley; Philip L. Marston
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Paper Abstract

The scattering of light by an air bubble in water should be enhanced in the angular region where totally reflected rays contribute. For nearly spherical bubbles this occurs at angles less than the critical scattering angle (I), which is 83°. Mie theory computations and a physical-optics approximation indica& that the transition from partial to total reflection should be accompanied by coarse oscillations in the intensity as a function of the scattering angle (I). This coarse structure is predicted as a consequence of interference and diffraction effects. In the present paper the first detailed observations are presented of the scattering of laser light from single bubbles in water. The bubble radii were in the range 26.4 - 986 pm. The angular locations of observed coarse-structure maxima and minima were in agreement with the physical-optics approximation and with Mie theory. Fine-structure oscillations in intensity were also observed, along with, in some cases, modulations of the fine-structure contrast. The angular spacings of these features were able to be modeled by the interference of certain scattered rays. The models give insight into the scattering properties of bubbles (even below 68°), and provide useful sizing techniques.

Paper Details

Date Published: 27 September 1984
PDF: 4 pages
Proc. SPIE 0489, Ocean Optics VII, (27 September 1984); doi: 10.1117/12.943298
Show Author Affiliations
Dean S. Langley, Washington State University (United States)
Philip L. Marston, Washington State University (United States)

Published in SPIE Proceedings Vol. 0489:
Ocean Optics VII
Marvin A. Blizard, Editor(s)

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