Longitudinal critical angle singularities and their effect on V(Z) of the line-focus-beam acoustic microscope

In order to investigate a mechanism which causes a velocity difference between the longitudinal wave and leaky surface skimming compressional 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...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1994-07, Vol.41 (4), p.458-466
Main Authors: Tsukahara, Y., Yongshen Liu, Neron, C., Jen, C.K., Kushibiki, J.
Format: Article
Language:English
Subjects:
Acoustic materials
Acoustic measurements
Acoustic reflection
Acoustic waves
Acoustical measurements and instrumentation
Acoustics
Cause effect analysis
Councils
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Measurement and testing methods
Measurement methods and techniques in continuum mechanics of solids
Microscopy
Optical materials
Physics
Solid mechanics
Solids
Structural and continuum mechanics
Surface acoustic waves
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Summary:In order to investigate a mechanism which causes a velocity difference between the longitudinal wave and leaky surface skimming compressional 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 Riemann sheet close to the longitudinal branch point is found to be responsible for the abrupt phase change at the longitudinal critical angle. This, together with an effect of a dominant Rayleigh wave pole, affects the V(z) measurement of the LSSCW. A method to estimate the longitudinal and shear wave velocities is discussed.< >
ISSN:0885-3010
1525-8955
DOI:10.1109/58.294105