Nanoscale resolution interrogation scheme for simultaneous static and dynamic fiber Bragg grating strain sensing

Marcus Perry, Philip Orr, Pawel Niewczas, Michael Johnston

Research output: Contribution to journalArticle

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A combined interrogation and signal processing technique which facilitates high-speed simultaneous static and dynamic strain demodulation of multiplexed fiber Bragg grating sensors is described. The scheme integrates passive, interferometric wavelength-demodulation and fast optical switching between wavelength division multiplexer channels with signal extraction via a software lock-in amplifier and fast Fourier transform. Static and dynamic strain measurements with noise floors of 1 nanostrain and 10 nanostrain/sqrt(Hz), between 5 mHz and 2 kHz were obtained. An inverse analysis applied to a cantilever beam set up was used to characterise and verify strain measurements using finite element modeling. By providing distributed measurements of both ultahigh-resolution static and dynamic strain, the proposed scheme will facilitate advanced structural health monitoring.
Original languageEnglish
Pages (from-to)3252 - 3258
Number of pages7
JournalJournal of Lightwave Technology
Issue number20
Publication statusPublished - 15 Oct 2012


  • fiber Bragg gratings
  • interrogation
  • optical fiber sensors
  • structural health monitoring

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