Ground-water monitoring using polymer optical fibre Bragg gratings

Moura Mehravar, Hanrui Yang, Wei Zhang, Dave J. Webb

Research output: Contribution to journalConference articlepeer-review


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.
Original languageEnglish
Article number111991M
JournalProceedings of SPIE - International Society for Optical Engineering
Publication statusPublished - 28 Aug 2019
EventSeventh European Workshop on Optical Fibre Sensors (EWOFS 2019) - Limassol, Cyprus
Duration: 1 Oct 20194 Oct 2019

Bibliographical note

Copyright 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).


  • FBG
  • Geotechnical monitoring
  • Polymer optical fibre
  • Soil
  • optical fibre Bragg grating


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