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Inthe present  study,  the  numerical  method  was  investigated  for  drawing  the  dispersion  and  displacement curves  of  ultrasonic  lamb  wave,  propagated  in  Aluminum  thin  plate.  Two  ultrasonic lamb wave techniques, pulse-echo (a1 mode emitter) and emission (s1 mode emitter), were used  for  interpretation  of  notch  defects  with  depths  of  10%,  30%  and  60%  of  plate  thickness. Thickness of plate was 2 mm,and the nominal center frequency of transducers,was 2 MHz. It was observed that these techniques are sensitive to evaluate defects, especially in short probe to defect distances. Also, it was found that amplitude analysis can give some qualitative information about defects depth by using Distance-Amplitude-Correction curves, but it was not sometime repeatable.In this respect, pulse echo method showed better sensitivity ofamplitude to defects depth variation.   Keywords: Lambwave, Thin plates,Displacem ent, Dispersion   1.,Introduction  Ultrasonic lamb  wave  are  being  used  for  interpretation  of  plates  [1],  multilayer  structures  [2],  pipes[3], rails [4], elbows [5], honeycomb structures [6], composite plates [2], and soon; also for

Defect detection in thin plates by ultrasonic lamb wave techniques