Abstract
A new formulation that allows one to describe backscattered echoes from elastic shells near absorbing plane interfaces is presented. This formulation is always consistent even at low frequencies and large distances from the interfaces and allows the rapid reproduction of backscattered echoes over frequency ranges of practical interest. This novel formulation is developed and is shown to be consistent with that reflecting interfaces. The method has been implemented and numerical results for both pulse and continuous wave signals are carried out. [Work sponsored by NRL and the Office of Naval Research.]
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