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A novel FBG interrogation method for potential structural health monitoring applications

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4 Author(s)
Pham, T.B. ; Groupe Optoelectron. pour les Syst. Embarques du LAAS, Univ. de Toulouse, Toulouse, France ; Seat, H.C. ; Bernal, O. ; Suleiman, M.

We propose an improved innovative interrogation scheme for fiber Bragg grating-based strain sensors using the optical feedback coupled into the cavity of a DFB laser diode. Strain-induced shifts of the Bragg grating peak reflectivity, which are back-reflected into the laser cavity when both the Bragg and laser wavelengths are in resonance, result in sawtooth-type fringes typical of optical feedback interference being produced. By introducing a modulation scheme to the laser drive current, the laser wavelength is scanned slowly across the extremities of the FBG spectrum, allowing the dynamic strain range to be extended by a factor of approximately half the width of the FBG spectrum. A resolution of ~6 μe is currently obtained via basic fringe counting of the detected sawtooth interference signals.

Published in:

Sensors, 2011 IEEE

Date of Conference:

28-31 Oct. 2011