Abstract
The signal-to-noise penalty of air or gas-coupled ultrasonics has so far limited its application principally to feasibility demonstration experiments and qualitative assessments of material condition [1–3]. In most cases to date, use of air-coupled ultrasound to estimate material properties has been performed by observing the phase-matched transmitted signal amplitude and correlating this occurrence with the plate wavespeed. While this approach has approximate validity, other experimental conditions, including geometry and frequency, as we have shown [4], can significantly alter the estimate of material properties made only on the basis of phase-matched amplitude extrema. In addition, since the acoustic impedance mismatch is so large in air-coupled measurements, material damping plays a greatly enhanced role in determining the nature of the transmitted or reflected field.
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References
W. M. D. Wright, D. A. Hutchins, “Non-contact tomography imaging using air-coupled capacitance transducers”, these proceedings.
M. Castaings, R. Farlow, G. Hayward, and P. Cawley, “Air-couples ultrasonic transducers for the detection of defects in plates”, these proceedings.
D. W. Schindel and D. A. Hutchins, “Through-thickness characterization of solids by wideband air-coupled ultrasound”, Ultrasonics 33, 11–17 (1995).
O. I. Lobkis, A. Safaeinili, and D. E. Chimenti, “Geometry and diffraction effects in acoustic beam reflection studies from a fluid-loaded plate”, these proceedings.
A. Safaeinili, O. I. Lobkis, and D. E. Chimenti, “Air-coupled ultrasonic characterization of composite plates”, Mat. Eval. 53, 1185–90.
S. Zeroug and L. B. Felsen, “Nonspecular reflection of two- and three-dimensional acoustic beams from fluid-immersed plane-layered elastic structures”, J. Acoust. Soc. Am. 95, 3075–89, 1994.
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, (Dover Publications, New York, 1972).
W. H. Press, B. Flannery, S. Teukolsky, and W. T. Vetterling, Numerical Recipes (Cambridge University Press, Cambridge, 1986).
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© 1996 Plenum Press, New York
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Chimenti, D.E., Safaeinili, A., Lobkis, O.I. (1996). Quantitative Materials Characterization of Elastic Plates Using Air-Coupled Leaky Lamb Waves. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0383-1_139
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DOI: https://doi.org/10.1007/978-1-4613-0383-1_139
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