From Event: SPIE Commercial + Scientific Sensing and Imaging, 2017
In recent years, many hydro power plants were modified to pump storage operation. This changes the loading conditions and new monitoring concepts are required. We developed a fiber Bragg grating based monitoring system which was installed inside a hydro power dam in 2013. This paper reports on detailed investigations of this network using an optical backscatter reflectometer, which allows distributed strain sensing with a very high spatial resolution up to millimeters. Therefore, an analysis of the strain profile between two anchoring points of a FBG sensor can be performed. In addition to distributed sensing, the different wavelengths of the FBGs are determined in the frequency domain to verify the results of a classical FBG interrogator. These comparisons and further laboratory studies prove the suitability of the fiber optic system and demonstrate that a detailed analysis of FBG networks using optical backscatter reflectometry can provide valuable insights.
Christoph Monsberger, Ferdinand Klug, and Werner Lienhart, "Performance assessment of a fiber Bragg grating sensor network inside a hydro power dam using optical backscatter reflectometry," Proc. SPIE 10208, Fiber Optic Sensors and Applications XIV, 102080R (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 12, 2017; Published: 27 April 2017); https://doi.org/10.1117/12.2262410.
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