Mehravar, M.Yang, H.Zhang, WeiWebb, D. J.2020-04-022020-04-022019-08-28Mehravar M, Yang H, Zhang W, Webb D. (2019) Ground-water monitoring using polymer optical fibre Bragg gratings. In: 7th European Workshop on Optical Fibre Sensors, 1-4 October 2019, Limassol, Cyprus9781510631236https://doi.org/10.1117/12.2541326https://dspace.lib.cranfield.ac.uk/handle/1826/15362Optical fibre Bragg grating sensors inscribed in polymer optical fibre have been shown to be sensitive to the water content of the medium surrounding the fibre and this property has been applied, for example, to the monitoring of humidity and the water content of aviation fuel. In this work we assess the feasibility of using such sensors for monitoring the saturation of soils, which is important for civil engineering applications. We find a very non-linear response, with a rapid increase in Bragg wavelength as the water content increases from 0 to 0.5%, with a much more gradual, but still monotonic, increase thereafter. We speculate on the causes of this response.enAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/Polymer optical fibreGeotechnical monitoringOptical fibre Bragg gratingFBGSoilConference paper