Ultra-high-sensitivity two-dimensional bend sensor

G M H Flockhart, W N MacPherson, J S Barton, C K Kirkendall, G A Cranch

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
117 Downloads (Pure)


A multicore fibre Fabry-Perot-based strain sensor interrogated with tandem interferometry for bend measurement is described. Curvature in two dimensions is obtained by measuring the difference in strain between three co-located low finesse Fabry-Perot interferometers formed in each core of the fibre by pairs of Bragg gratings. This sensor provides a responsivity enhancement of up to 30 times that of a previously reported fibre Bragg grating based sensor. Strain resolutions of 0.6 n epsilon/Hz(1/2) above 1 Hz are demonstrated, which corresponds to a curvature resolution of similar to 0.012 km(-1)/Hz(1/2).

Original languageEnglish
Pages (from-to)520-522
Number of pages3
JournalElectronics Letters
Issue number9
Publication statusPublished - 27 Apr 2006


  • ultra high sensitivity
  • two dimensional
  • bend sensor
  • fibre optic sensors
  • strain sensors
  • bragg gratings
  • fabry-perot interferometers
  • curvature measurement


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