Experimental and Numerical Study on Characterization and Evaluation of Surface Cracks with Wireless Ultrasonic Sensor

Figure 7

Wireless ultrasonic data and envelopes. (a–e) Wireless signal and envelope obtained from undamaged area and artificial cracks with depths of 0.51 mm, 1.27 mm, 2.29 mm, and 3.05 mm, respectively. (f) Diagram for different possible propagation path.

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