Laser generation of Lamb waves for defect detection: experimental methods and finite element modeling

Susan E Burrows; Ben Dutton; Steve Dixon

doi:10.1109/TUFFC.2012.2158

Laser generation of Lamb waves for defect detection: experimental methods and finite element modeling

IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Jan;59(1):82-9. doi: 10.1109/TUFFC.2012.2158.

Authors

Susan E Burrows¹, Ben Dutton, Steve Dixon

Affiliation

¹ Physics Department, University of Warwick, Coventry, UK. s.e.burrows@warwick.ac.uk

PMID: 22293738
DOI: 10.1109/TUFFC.2012.2158

Abstract

The propagation of Lamb waves generated by a pulsed laser beam in an aluminum sheet is modeled using finite element analysis, and the interaction with defects is studied and compared to experimental results. The ultrasonic Lamb waves are detected by an electromagnetic acoustic transducer (EMAT). The frequency content of the received wave is shown to be enhanced when the generation point is situated directly over the defect in both the modeled and experimental cases. Time-frequency analysis using a Wigner transform has enabled individual modes to be identified.

Publication types

Research Support, Non-U.S. Gov't