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

By
Oleg I. Lobkis
Oleg I. Lobkis
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Richard L. Weaver
Richard L. Weaver
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Published:
January 01, 2008

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. © 2001 Acoustical Society of America. [DOI: 10.1121/1.1417528] PACS numbers: 43.40.Qi, 43.40.Hb, 43.35.Yb [DEC]

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Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Interferometry: History and Present Status

Kees Wapenaar
Kees Wapenaar
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Deyan Draganov
Deyan Draganov
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Johan O.A. Robertsson
Johan O.A. Robertsson
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Society of Exploration Geophysicists
Volume
26
ISBN electronic:
9781560801924
Publication date:
January 01, 2008

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