Estimation of geometrical and acoustical parameters of thin-walled objects using the Lamb waves

The algorithm of flaw localization in thin-walled objects, based on the analysis of the dispersive characteristics of Lamb waves, is proposed in this work. It is shown that application of the instantaneous frequency estimation method with the use of wavelet transform makes it possible to reconstruct extensive parts of frequency dependencies of group delay time for different modes of Lamb waves. An additional advantage of proposed method is high noise immunity.