Tunnel monitoring using multicore 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, D.N. Chapman, C.D.F. Rogers

Research output: Contribution to journalArticlepeer-review


In this paper, we report the first demonstration of multiplexed fibre Bragg grating strain sensors in a multicore fibre for shape measurement and their application to structural monitoring. Sets of gratings, acting as strain gauges, are co-located in the multicore fibre such that they enable the curvature to be determined via differential strain measurement. Multiple sets of these gratings allow the curvature to be measured at several points along the fibre. In this paper, the multicore fibre is configured to measure the deflection of a simple mechanical beam arising from the displacement of concrete tunnel sections. Laboratory tests are presented in which the system was demonstrated capable of displacement measurement with a resolution of ±0.1 mm over a range of several millimetres. © 2006 IOP Publishing Ltd.

Original languageEnglish
Pages (from-to)1180-1185
Number of pages6
JournalMeasurement Science and Technology
Issue number5
Early online date13 Apr 2006
Publication statusPublished - May 2006


  • multicore fibre
  • optical fibre
  • sensors
  • structural monitoring


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