Figure 10
From: Non-contact ultrasonic inspection by Gas-Coupled Laser Acoustic Detection (GCLAD)

Signal acquired in correspondence of a surface defect. The signals associated with the defect and the the backwall echo are visible.
From: Non-contact ultrasonic inspection by Gas-Coupled Laser Acoustic Detection (GCLAD)

Signal acquired in correspondence of a surface defect. The signals associated with the defect and the the backwall echo are visible.