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Surface- bonded and embedded optical fibres as ultrasonic sensors

Pierce, Stephen and Philp, WR and Gachagan, Anthony and McNab, Alistair and Hayward, Gordon and Culshaw, Brian (1996) Surface- bonded and embedded optical fibres as ultrasonic sensors. Applied Optics, 35 (25). pp. 5191-5197. ISSN 1559-128X

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The effectiveness of surface-bonded and embedded optical fibers for the detection of ultrasonic Lamb waves in 2–3-mm-thick steel, carbon-fiber-reinforced plastic (CFRP) and glass-reinforced plastic (GRP) plates are compared. A novel integrating ultrasonic sensor was achieved using the signal arm of an actively stabilized 633-nm homodyne Mach–Zehnder fiber interferometer which was either bonded directly to the plate surface or spliced to single-mode fibers embedded within a composite plate during manufacture. An embedded fiber is shown to be about 20 times more sensitive to Lamb wave motions than a surface-bonded fiber. However, the latter may be more practical.