Abstract
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
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