Applications of Bragg grating sensors in Europe
Résumé
Fiber Bragg gratings (FBG) are now recognized as very important optoelectronic components for guided-wave optics owing to the large number of device functions they can facilitate FBGs have the advantages of being absolute, linear in response, interrupt-immune and of very low insertion loss so that they can be multiplexed in series along a single monomode fiber. Also, any specific network (star, series, fish-bone, ...) can be implemented and modified a long time after the setting-up, thus increasing the return on investments. As the spectral signature renders the measurement free from intensity fluctuations, it guarantees reproducible measurements despite optical losses (bending, ageing of connectors) or even under high radiation environments (darkening of fibers). Moreover, FBGs may be easily embedded into materials to provide local damage detection as well as internal strain field mapping with high localization, resolution in strain and large measurement range. The FBG is therefore a major component for the development of smart structure technology.
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