1990•The Journal of the Acoustical Society of AmericaOpen access

Acoustic scattering from free field and buried spherical shells

Joseph L. Lopes, Douglas G. Todoroff

Abstract

A measurement was conducted to investigate the effect of sediment loading on the characteristic elastic response of an object. Backscattered form functions were obtained for free field and buried 2% and 11% spherical shells. The results have shown that the free-field form function for the 2% shell is dominated by the nondispersive s0 mode while the 11% shell is dominated by the antisymmetric Lamb mode a0. Upon sediment loading, the a0 resonances shifted to higher frequencies. The results of this experiment are in good agreement with theoretical calculations.

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Key concepts: Antisymmetric relation, Spherical shell, Shell (structure), Free field, Field (mathematics), Scattering, Vibration, Mode (computer interface)