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

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4 Author(s)
Perry, M. ; Dept. of Electron. & Electr. Eng., Univ. of Strathclyde, Glasgow, UK ; Orr, P. ; Niewczas, P. ; Johnston, M.

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 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.

Published in:

Lightwave Technology, Journal of  (Volume:30 ,  Issue: 20 )

Date of Publication:

Oct.15, 2012

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