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(a) A cracked aluminum plate showing incident Lamb waves (ILW), boundary reflected Lamb waves (BRLW) and damage reflected Lamb waves (DRLW) [51,52], (b) Experimental setup showing the plate, active sensors, and instrumentation [51,52], (c) the incident signal and the reflected (echoes) signals on sensor [51,52], (d) Damage Metric [58] (e) A CT specimen with PWAS.
