Simultaneous measurement of strain and curvature using superstructure fibre Bragg gratings

B.A.L. Gwandu, X.W. Shu, Y. Liu, W. Zhang, L. Zhang, I. Bennion

Research output: Contribution to journalArticlepeer-review


We report the first demonstration of the simultaneous measurement of strain and curvature, with temperature compensation, using a single superstructure fibre Bragg grating (SFBG). The SFBG exhibits the properties of both the fibre Bragg grating (FBG) and the long period fibre grating (LPG) such that its spectral response facilitates strain measurement from the wavelength shift of the FBG-like characteristic, and independent measurement of curvature from the LPG-like mode-splitting characteristic. The dependence of the LPG mode-splitting on the mode order has also been investigated and utilised for the measurement of very small curvatures.

Original languageEnglish
Pages (from-to)133-139
Number of pages7
JournalSensors and Actuators A : physical
Issue number2-3
Publication statusPublished - 28 Feb 2002


  • sampled fibre Bragg grating
  • smart structures
  • strain and curvature sensing


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