Abstract
Optical fiber sensors have been used in several applications due to their unique advantages, such as immunity to electromagnetic interference, small size, light-weight, and robustness, for example. Long-period fiber grating (LPFG) is a type of fiber sensor with great sensitivity to several parameters, including the surrounding refractive index. However, the challenge in using LPFGs lies in their interrogation, which relates the change in optical characteristics with the measurand. This paper presents a novel method for the interrogation of LPFG sensors. This method uses a single FBG attached to a vibrating piezoelectric component and harmonic analysis of the optical power reflected by the FBG filter to estimate the resonant wavelength of an LPFG. The method was simulated to process several arc-induced LPFG spectra and achieved results comparable to the baseline method for half of the test set and improved by roughly 5 times the accuracy and precision by limiting the dynamic range.
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