Tunnel monitoring using multicore fibre displacement sensor

W. N. MacPherson*, M. Silva-Lopez, J. S. Barton, A. J. Moore, J. D C Jones, D. Zhao, L. Zhang, I. Bennion, N. Metje, C. D F Rogers, D. N. Chapman

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We describe the first application of multiplexed fibre Bragg grating strain sensors in a multicore fibre. Sets of gratings, acting as strain gauges, are co-located in the multicore fibre such that they enable the curvature to be measured. Multiple sets of these gratings allow the curvature to be measured at several points along the fibre. This sensor is configured to monitor displacement of concrete tunnel sections, and was demonstrated capable of displacement measurement with a resolution of ±0.1 mm over a range of several millimeters.

Original languageEnglish
Article number65
Pages (from-to)274-277
Number of pages4
JournalProceedings of SPIE - International Society for Optical Engineering
Issue numberPART I
Publication statusPublished - 23 May 2005
Event17th international conference on Optical Fibre Sensors - Bruges, Belgium
Duration: 23 May 200527 May 2005

Bibliographical note

Copyright 2005 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.


  • Bend sensing
  • Fibre Bragg grating
  • Multicore
  • Optical fibre
  • Structural monitoring


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