The results of an experimental study conducted to detect subsurface defects in a thick Gr/PPS composite test sample using a non-contact ultrasonic system are presented. Surface waves are generated by a pulsed laser and detected by a air-coupled capacitance transducer. By controlling the surface wave wavelength through a shadow mask, it is possible to control surface wave penetration depth in the sample. Surface wave peak-to-peak amplitude is related to the near-surface material condition. Results indicate that signal amplitude decreases as the width of the defect increases and an approximately linear relation can be deduced.
Cerniglia, D., Djordjevic, B., Nigrelli, V. (2001). Quantitative subsurface defect detection in composite materials using a non-contact ultrasonic system. In Proceedings of the IEEE Ultrasonics Symposium (pp.751-754).
Quantitative subsurface defect detection in composite materials using a non-contact ultrasonic system
CERNIGLIA, Donatella;NIGRELLI, Vincenzo
2001-01-01
Abstract
The results of an experimental study conducted to detect subsurface defects in a thick Gr/PPS composite test sample using a non-contact ultrasonic system are presented. Surface waves are generated by a pulsed laser and detected by a air-coupled capacitance transducer. By controlling the surface wave wavelength through a shadow mask, it is possible to control surface wave penetration depth in the sample. Surface wave peak-to-peak amplitude is related to the near-surface material condition. Results indicate that signal amplitude decreases as the width of the defect increases and an approximately linear relation can be deduced.File | Dimensione | Formato | |
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