Abstract
Laser-generated transient Lamb waves have been proven to be a useful tool for determining thin plate thickness and elastic constants. The measurement relies on the wide range of frequencies generated by the thermoelastic or ablation laser source [1]. The dispersion relation of the lowest Lamb-wave modes can be determined using established signal processing techniques. Usually the Lamb-wave packet propagating on a plate is observed using for example a) a contact “wedge” transducer, b) by observing the leakage of energy in directions where the k-matching condition is fulfilled or c) an interferometer, d) with near-field microphones with spatial periodicity on the sensitive surface to pick a particular wavelength [2,3,4,5]. The last three of these methods are non-contacting and therefore attractive for practical applications.
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References
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© 1995 Plenum Press, New York
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Oksanen, M., Stor-Pellinen, J., Luukkala, M. (1995). Determining Mechanical Properties of Cardboard from Photoacoustic Lamb Wave Transmission Data. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1987-4_211
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DOI: https://doi.org/10.1007/978-1-4615-1987-4_211
Publisher Name: Springer, Boston, MA
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