Abstract
A prominent feature predicted for the backscattering by thin spherical shells is an enhancement of the guided wave contributions in the midfrequency range [L. G. Zhang etal., J. Acoust. Soc. Am. 91, 1862–1874 (1992)]. This feature may be useful for certain inverse problems and is associated with a strongly coupled slightly subsonic wave denoted by some authors as the a0− wave. The present research gives a comparison between a ray analysis and experiments in which tone bursts having carrier frequencies ω=kc in the range 35<ka<70 were incident on an empty stainless steel shell in water. The sphere’s radius to thickness ratio is a/h=43.8. Time records of echoes provided a means for measuring the guided wave contribution relative to that of the specular reflection. As predicted the guided wave echo can be over three times larger than the specular echo and the ka dependence generally follows the predicted hump. [Work supported by ONR. The author acknowledges the advice of P. L. Marston.]
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