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

Table 1

Coordinates of transducers.

Actuators		Sensors
PZT	Coordinate (, )/mm	PZT	Coordinate (, )/mm
1	(290, 290)	9	(290, 710)
2	(350, 290)	10	(350, 710)
3	(410, 290)	11	(410, 710)
4	(470, 290)	12	(470, 710)
5	(530, 290)	13	(530, 710)
6	(590, 290)	14	(590, 710)
7	(650, 290)	15	(650, 710)
8	(710, 290)	16	(710, 710)