Bounded beam interaction with thin inclusions. Characterization by phase differences at Rayleigh angle incidence

被引:50
作者
Briers, R
Leroy, O
Shkerdin, G
机构
[1] Katholieke Univ Leuven, Interdisciplinary Res Ctr, B-8500 Kortrijk, Belgium
[2] Russian Acad Sci, Inst Radioengn & Elect, Moscow, Russia
关键词
D O I
10.1121/1.1289364
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A theoretical study of the reflection of a bounded Gaussian ultrasonic beam, incident onto a rectangular inclusion located near a fluid/solid half-space interface, is presented. The thickness of the inclusion is assumed to be much smaller than the ultrasonic wavelength in the solid. It is shown that, at critical Rayleigh angle incidence, the phase in the point of maximum amplitude of the shifted reflected lobe is very sensitive to dimension variations of the inclusion, and thus useful for inclusion characterization. The modelization of the problem is based on mode theory. (C) 2000 Acoustical Society of America. [S0001-4966(00)01510-1].
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页码:1622 / 1630
页数:9
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