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Surface bonded optical fibre sensors for the inspection of CFRP plates using ultrasonic Lamb waves

Pierce, Stephen and Philp, WR and Culshaw, B and Gachagan, Anthony and McNab, Alistair and Hayward, Gordon and Lecuyer, F (1996) Surface bonded optical fibre sensors for the inspection of CFRP plates using ultrasonic Lamb waves. Smart Materials and Structures, 5 (6). pp. 776-787. ISSN 0964-1726

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Abstract

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.