A preliminary investigation of excitation signal parameters on the detection of delamination in composite plates is presented. Composite plates typical of aerospace applications are used and excitation is provided through integrated PZT actuator. A scanning laser vibrometer is used for recording structural responses. Experimental results at three frequencies (15, 18, and 20 kHz) and two pulse widths (3.5 and 5.5 cycles) show the significant effects of incident Lamb waves on damage signature. Numerical studies using a commercial finite element code (ABAQUS) show good correlation with experimental results with appropriate level of structural damping.

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