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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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 - the International Society for Optical Engineering
Volume5855 PART I
Publication statusPublished - 2005
Event17th International Conference on Optical Fibre Sensors - Bruges, Belgium
Duration: 23 May 200527 May 2005


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


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