16 May 2008 Structural concrete condition monitoring using a long period grating-based humidity sensor
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Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70045N (2008) https://doi.org/10.1117/12.786554
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia
Abstract
An optically based sensor has been designed, fabricated and characterized in research to determine moisture ingress in a range of structural concrete samples subjected to a variety of changing environmental conditions. The approach taken to the creation of these novel humidity sensors is using long period grating (LPG) technology in an optical fibre. The sensor is configured by coating LPGs with a thin layer of polymer, following which it was characterized and its performance cross-compared with that of other sensors. The thin layer of polyvinyl alcohol (PVA), whose refractive index varies as a function of humidity level, provides a means to change the optical propagation in the fibre and thus to induce the a wavelength shift in the attenuation bands of its transmission spectrum.
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T. Venugopalan, T. Venugopalan, T. Sun, T. Sun, K. T. V. Grattan, K. T. V. Grattan, } "Structural concrete condition monitoring using a long period grating-based humidity sensor", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70045N (16 May 2008); doi: 10.1117/12.786554; https://doi.org/10.1117/12.786554
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