Abstract
A processing scheme able to obtain any arbitrary intragrating strain distribution of a fiber Bragg grating (FBG) is proposed and demonstrated. The processing method employs just the intensity of the FBG reflection spectrum to obtain its deformation profile by combining a geometrical processing scheme with the particle swarm optimization technique. The technique has been evaluated using several spectra generated from very heterogeneous strain distributions and with a real spectrum obtained from a 5 mm length FBG under an asymmetric perturbation. The achieved results exhibit a good spatial resolution (Δ≈0.5 mm) and repeatability.
Highlights
Fiber Bragg grating based transducers (FBGTs) [1] are a mature technology widely applied to monitor different materials and structures
Several approaches have been proposed to obtain the deformation profile along the fiber Bragg grating (FBG) structure, but most of them require phase measurements of the reflection spectrum [3,4] or a priori knowledge of the strain distribution [5,6,7]. Another approach based on a computational method [8] has been proposed to retrieve the strain distribution of sampled FBGs just from their reflection spectra; the spatial resolution of this method is limited by the sampling period of the sampled FBG
In this Letter, the particle swarm optimization (PSO) technique [9,10] has been combined with a geometrical processing method to obtain any arbitrary axial strain profile of an FBG from its reflection spectrum
Summary
Fiber Bragg grating based transducers (FBGTs) [1] are a mature technology widely applied to monitor different materials and structures. Several approaches have been proposed to obtain the deformation profile along the FBG structure, but most of them require phase measurements of the reflection spectrum [3,4] or a priori knowledge of the strain distribution [5,6,7].
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