Surface-bonded single-mode optical fibre sensors have been used to monitor the interaction of ultrasonic S-0 lamb waves with defects in carbon iibre composite plates. Lamb waves were initiated using Perspex-coupled piezoelectric transducers. The defects investigated comprised holes, regions of impact damage and delaminations. Holes could be identified by analysing direct S-0 reflections and impact damage by S-0 back-waif echo amplitude. Large delaminations gave a poor direct S-0 reflection. Evidence was found for mode conversion at centre plane delaminations.
- ultrasonic Lamb waves
- optical fibre sensors
- CFRP plates
Pierce, S., Philp, WR., Culshaw, B., Gachagan, A., McNab, A., Hayward, G., & Lecuyer, F. (1996). Surface bonded optical fibre sensors for the inspection of CFRP plates using ultrasonic Lamb waves. Smart Materials and Structures, 5(6), 776-787. https://doi.org/10.1088/0964-1726/5/6/007