“…Previous efforts of using Lamb waves to inspect defects in composite and metal plates include the works of Chimenti and Nayfeh [4], Nagyet aI. [5], Nayfeh [6], Bar-Cohen and Chimenti [7], Chimenti and Bar-Cohen [8], Martin and Chimenti [9], Mal and Bar-Cohen [10], Tang and Henneke [11], Bridge and Ramli [12], Atalar et.aI. [13,14], Chimenti and Martin [15], Alleyne and Cowley [16], Rose et al [17], Pilarski and Rose [18], Challis and Bork 19], Tung et.al.…”