Optical 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.
|Journal||Proceedings of SPIE - International Society for Optical Engineering|
|Publication status||Published - 28 Aug 2019|
|Event||Seventh European Workshop on Optical Fibre Sensors (EWOFS 2019) - Limassol, Cyprus|
Duration: 1 Oct 2019 → 4 Oct 2019
Bibliographical noteCopyright 2019 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Funding: Aston Institute of Materials Research (AIMR).
- Geotechnical monitoring
- Polymer optical fibre
- optical fibre Bragg grating