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

被引:843
作者
Lobkis, OI [1 ]
Weaver, RL [1 ]
机构
[1] Univ Illinois, Urbana, IL 61801 USA
关键词
D O I
10.1121/1.1417528
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
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. (C) 2001 Acoustical Society of America.
引用
收藏
页码:3011 / 3017
页数:7
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