Abstract: The hydro-electric power dam of Luzzone in Switzerlandhas been heightened by 17 m to 225 m. Distributed fiberoptical sensors, based on wavelength multiplexed Bragggratings, have been embedded in the concrete to monitortemperature and strain evolution. The sensors weredesigned to make them suitable for embedding andoperation in this harsh environment. Data taken duringcuring and the first year afterwards are presented. !8
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