Wave-obstacle interaction in a lossy medium: energy perturbations and negative extinction

N. Brauner, A. I. Beltzer

Research output: Contribution to journalArticlepeer-review

Abstract

The concept of a generalized extinction cross-section introduced in a previous paper is given in detail and exemplified by the problem of scattering by an elastic cylinder embedded in a viscoelastic matrix. It is shown that under certain conditions the presence of inclusion may have a supporting effect on wave propagation (negative extinction). The derived low-frequency expansions indicate that the Rayleigh law may not hold in the case of a lossy medium. Numerical results as well as discussions concerning separation between scattering and intrinsic viscoelastic losses are also given.

Original languageEnglish
Pages (from-to)328-334
Number of pages7
JournalUltrasonics
Volume26
Issue number6
DOIs
StatePublished - Nov 1988

Keywords

  • inclusions
  • viscoelastic losses
  • wave scattering

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