### Defect detection and localization in plates using a lamb wave time reversal techniqueDefect detection and localization in plates using a lamb wave time reversal technique

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 Author Jeong, Hyunjo ♦ Lee, Jung Sik ♦ Bae, Sung Min Source SpringerLink Content type Text Publisher Korean Society for Precision Engineering File Format PDF Copyright Year ©2011 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword Base-line free detection ♦ Beam forming ♦ Defect imaging ♦ Flaw scattering ♦ Lamb wave ♦ Time reversal ♦ Materials Science ♦ Industrial and Production Engineering Abstract This paper presents an analytical investigation for a baseline-free imaging of a defect in plate-like structures using the time-reversal of Lamb waves. We first consider the flexural wave (A$_{0}$ mode) propagation in a plate containing a defect, and reception and time reversal process of the output signal at the receiver. The received output signal is found t obe composed of two parts: a directly propagated wave and a scattered wave from the defect. The time reversal of these waves recovers the original input signal, and produces two additional sidebands that contain the time-of-flight information on the defect location. One of the side band signals is then extracted as a pure defect signal. A defect localization image is then constructed from a beamforming technique based on the time-frequency analysis of the side band signal for each transducer pair in a network of sensors. The simulation results show that the proposed scheme enables the accurate, baseline-free detection of a defect, so that experimental studies are needed to verify the proposed technique and to be applied to real structural health monitoring applications. ISSN 12298557 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2011-06-01 Publisher Place Springer e-ISSN 20054602 Journal International Journal of Precision Engineering and Manufacturing Volume Number 12 Issue Number 3 Page Count 8 Starting Page 427 Ending Page 434