All-fibre optical sensing system: Bragg grating sensor interrogated by a long-period grating

R. W. Fallon, L. Zhang, L. A. Everall, J. A.R. Williams, I. Bennion

Research output: Contribution to journalArticle

98 Citations (Scopus)


We report here a simple, low-cost all-fibre grating strain sensing interrogation technique offering high static-strain resolution (Q.5με) and large dynamic range (>8100με). A key interrogating component of this technique is a long-period grating which acts as an edge filter converting strain-induced wavelength variation into optical power measurement. The transmission profile of the long-period grating is shown to be nearly linear over a sufficiently wide range, yielding a linear relationship between the resultant intensity and applied strain, and a high resolution achieved by standard lock-in techniques.

Original languageEnglish
Pages (from-to)1969-1973
Number of pages5
JournalMeasurement Science and Technology
Issue number12
Publication statusPublished - 1998
Externally publishedYes



  • Fibre Bragg gratings
  • Modulation
  • Smart structures
  • Strain

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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