LONGITUDINAL CRITICAL ANGLE SINGULARITIES AND THEIR EFFECT ON V(Z) OFTHE LINE-FOCUS-BEAM ACOUSTIC MICROSCOPE

Authors
TSUKAHARA Y LIU YS NERON C JEN CK KUSHIBIKI J
Citation
Y. Tsukahara et al., LONGITUDINAL CRITICAL ANGLE SINGULARITIES AND THEIR EFFECT ON V(Z) OFTHE LINE-FOCUS-BEAM ACOUSTIC MICROSCOPE, IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 41(4), 1994, pp. 458-466
Citations number
19
Categorie Soggetti
Engineering, Eletrical & Electronic",Acoustics
Journal title
IEEE transactions on ultrasonics, ferroelectrics, and frequency control → ACNP
ISSN journal
08853010
Volume
41
Issue
4
Year of publication
1994
Pages
458 - 466
Database
ISI
SICI code
0885-3010(1994)41:4<458:LCASAT>2.0.ZU;2-Z
Abstract
In order to investigate a mechanism which causes a velocity difference between the longitudinal wave and leaky surface skimming compressiona l wave (LSSCW) observed in a line-focus-beam acoustic microscope, the analytic property of an acoustic reflection coefficient and its effect on a V(z) analysis were studied. A pole hidden in the unphysical Riem ann sheet close to the longitudinal branch point is found to be respon sible for the abrupt phase change at the longitudinal critical angle. This, together with an effect of a dominant Rayleigh wave pole, affect s the V(z) measurement of the LSSCW. A method to estimate the longitud inal and shear wave velocities is discussed.