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- W2078320307 abstract "Health and usage monitoring systems for composite structures based on Lamb wave propagation are one of the most promising systems presently evaluated. Generally, they are constituted of a network of piezoelectric transducers. The various transducers generate and receive the Lamb waves. The diagnostic is based on the perturbation in the propagation of the waves due to the presence of the damage. In view to develop less intrusive actuators/sensors, the possibility of using a fiber optic delivery system for laser generation of Lamb waves is evaluated. 125 μm-dia. optical fibers are embedded in the composite during the process. The energy of the pulses are lower than a mJ allowing a good functioning of the system even after several hundred of thousands pulses. The out-of-plane displacement field on the surface of a carbon-epoxy structure equipped by such a system is reconstructed (B-scan) using point measurement from a very sensitive and wide-band (20 kHz - 30 MHz) interferometric probe. The analysis of typical B-scans by 2-D Fourier transform clearly demonstrates the generation of Lamb waves. Various modes are excited, from the fundamental ones to high order ones. Comparison to theoretical dispersion curves is presented." @default.
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- W2078320307 date "2000-06-22" @default.
- W2078320307 modified "2023-09-23" @default.
- W2078320307 title "Laser-generated Lamb waves in carbon/epoxy composite structures using an embedded fiber optic delivery system" @default.
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- W2078320307 doi "https://doi.org/10.1117/12.388856" @default.
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