Abstract
The paper describes the theory and implementation issues of modeling of the backscattered field from a thin air-filled spherical elastic shell immersed in water close to the seabed or to the air/water interface. Computational results obtained for the full multiple scattering solution are compared with the model utilizing the single-scatter approximation in a wide-frequency range 0 < k0a ≤ 55. In this frequency range for a thin air-filled spherical shell the main elastic contribution to scattering is due to the lowest-order compressional wave which is the generalization of the Lamb symmetric wave of a flat plate and due to the subsonic mode of the first antisymmetric Lamb wave. Strong resonance peaks produced by these waves in the backscattered form functions have been identified in numerical modeling. It has been shown that when the object is close to the interface in addition to geometrical reflections between the shell and the interface, strong interactions due to these resonances can be observed.
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