Backscattering in the vicinity of a mode cutoff

A. M. Whitman*, M. J. Beran, S. Frankenthal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In a recent paper to this journal (Whitman A M et al 2003 Waves Random Media 13 269-86) we derived a set of coupled equations that describe the intermodal scattering of acoustic radiation in a duct whose speed of sound varies randomly in space and time. In the paper we were mainly interested in modes that were not near cutoff. Here we study the solution of these equations in the vicinity of the cutoff. We find that near cutoff almost all the energy is reflected back independent of the other duct parameters. In addition to presenting these results, we analyse the mathematical structure of the equations in these regions in order to elucidate the reason for this behaviour.

Original languageEnglish
Pages (from-to)425-434
Number of pages10
JournalWaves in Random and Complex Media
Issue number3
StatePublished - Jul 2004


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