On the emergence of the Green's function in the correlations of a diffuse field

O. I. Lobkis, R. L. Weaver

Research output: Contribution to journalArticlepeer-review

Abstract

A diffuse acoustic field is shown to have correlations equal to the Green's function of the body. Simple plausibility arguments for this assertion are followed by a more detailed proof. A careful version of the statement is found to include caveats in regard to how diffuse the field truly is, the spectrum of the diffuse field, and the phase of the receivers. Ultrasonic laboratory tests confirm the assertion. The main features of the direct signal between two transducers are indeed recovered by cross correlating their responses to a diffuse field generated by a third transducer. The quality of the recovery improves with increased averaging and the use of multiple sources. Applications are discussed.

Original languageEnglish (US)
Pages (from-to)3011-3017
Number of pages7
JournalJournal of the Acoustical Society of America
Volume110
Issue number6
DOIs
StatePublished - 2001

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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