Estimation of the thickness of thin metal sheet using laser generated ultrasound

Dewhurst, R. J.; Edwards, C.; McKie, A. D. W.; Palmer, S. B.
October 1987
Applied Physics Letters;10/5/1987, Vol. 51 Issue 14, p1066
Academic Journal
A noncontacting technique has been developed to measure the thickness of thin metal sheet by using a pulsed laser to generate both symmetric and antisymmetric Lamb waves. These have been detected with a laser interferometer. Analysis of the waveforms allows an estimation of the sheet thickness and accuracies to within 2% are attainable on sheets as thin as 27 μm.


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