6533b82cfe1ef96bd128f69a

RESEARCH PRODUCT

Quantitative subsurface defect detection in composite materials using a non-contact ultrasonic system

B. Boro DjordjevicVincenzo NigrelliDonatella Cerniglia

subject

Physical acousticsMaterials sciencebusiness.industryAcousticsSurface acoustic waveUltrasonic testingWavelengthOpticsAmplitudeEngineering (all)Surface waveUltrasonic sensorbusinessPenetration depth

description

The results of an experimental study conducted to detect subsurface defects in a thick Gr/PPS composite test sample using a noncontact ultrasonic system are presented. Surface waves are generated by a pulsed laser and detected by an 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.

yearjournalcountryeditionlanguage
2002-11-14
http://hdl.handle.net/10447/201567