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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 30, Iss. 20 — Oct. 15, 2012
  • pp: 3252–3258

Nanoscale Resolution Interrogation Scheme for Simultaneous Static and Dynamic Fiber Bragg Grating Strain Sensing

Marcus Perry, Philip Orr, Pawel Niewczas, and Michael Johnston

Journal of Lightwave Technology, Vol. 30, Issue 20, pp. 3252-3258 (2012)

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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 nε and ~10 nε/√Hz, between 5 mHz and 2 kHz were obtained. An inverse analysis applied to a cantilever beam set up was used to characterize and verify strain measurements using finite element modeling. By providing distributed measurements of both ultra-high-resolution static and dynamic strain, the proposed scheme will facilitate advanced structural health monitoring.

© 2012 IEEE

Marcus Perry, Philip Orr, Pawel Niewczas, and Michael Johnston, "Nanoscale Resolution Interrogation Scheme for Simultaneous Static and Dynamic Fiber Bragg Grating Strain Sensing," J. Lightwave Technol. 30, 3252-3258 (2012)

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