Session 4pUWa Underwater Acoustics: Volume Scattering From Objects, Bubbles, or Internal Waves

The presence of a flat reflecting boundary can enable target scattering mechanisms that are not possible for objects in the free field. Experimental results demonstrating a strong boundary related backscattering feature for a solid aluminum cylinder near an air-water interface will be presented. Thi...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-10, Vol.130 (4), p.2554-2556
Main Author: Culver, R L
Format: Article
Language:English
Subjects:
Aluminum
Backscattering
Boundaries
Cylinders
Mathematical models
Scattering
Steels
Tanks
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Summary:The presence of a flat reflecting boundary can enable target scattering mechanisms that are not possible for objects in the free field. Experimental results demonstrating a strong boundary related backscattering feature for a solid aluminum cylinder near an air-water interface will be presented. This effect has been modeled previously [J. R. La Follett, Ph.D. thesis, WSU (2010)] by treating the volume of water bounded by the top surface of a solid cylinder and the air-water interface as a waveguide; qualitative agreement between the model and experimental results was demonstrated. In the present work that model is extended to incorporate aspects of the scatterer geometry. Monostatic and bistatic experimental measurements were obtained by suspending a solid aluminum cylinder, solid steel sphere, and a rectangular aluminum bar through the air-water interface of a tank. Model predictions for a solid cylinder are in good agreement with the observed dependence of the feature on the distance from the cylinder to the air-water interface.
ISSN:0001-4966