Abstract
Surface guided leaky Rayleigh waves have been shown to provide a significant contribution to the backscattering by a solid metallic cylinder [K. Gipson and P. L. Marston, J. Acoust. Soc. Am. 106, 1673 (1999)]. Free field observations of the backscattering by solid aluminum cylinders confirm that both meridional and helical rays contribute to the backscattering for different angles of cylinder tilt [K. Baik, Ph.D. thesis, WSU (2008)]. Those studies show that a previously developed criteria, based on the length of the cylinder, limits the range of tilt angles for which helical rays can contribute [F. J. Blonigen and P. L. Marston, J. Acoust. Soc. Am. 112, 528 (2002)]. Experiments with solid aluminum cylinders placed near a flat reflecting boundary suggest that the presence of a boundary can increase the number of helical ray paths that contribute to the backscattering; this increase can lead to increased backscattering amplitudes and an increased range of angles for which coupling to helical rays can occur. To investigate this effect, solid aluminum cylinders were suspended below the free surface of a water tank. Targets were illuminated from below at grazing incidence, and the backscattering was measured as a function of target rotation. [Work supported by ONR.]
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