Damage Detection of Closed Crack in a Metallic Plate Using Nonlinear Ultrasonic Time Reversal Method

Figure 6

The receive waves of Lamb wave time reversal procedure for the path P6–12: (a) forward wave after 420 mm (50 V excitation), (b) forward wave after 420 mm (150 V excitation), (c) reconstructed waves (50 V excitation), and (d) reconstructed waves (150 V excitation).

(a)

(b)

(c)

(d)