Advanced Interrogation of Fiber-Optic Bragg Grating and Fabry-Perot Sensors with KLT Analysis
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Date
2015-10-29
Authors
Tosi, Daniele
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
The Karhunen-Loeve Transform (KLT) is applied to accurate detection of
optical fiber sensors in the spectral domain. By processing an optical spectrum, although
coarsely sampled, through the KLT, and subsequently processing the obtained eigenvalues,
it is possible to decode a plurality of optical sensor results. The KLT returns higher
accuracy than other demodulation techniques, despite coarse sampling, and exhibits higher
resilience to noise. Three case studies of KLT-based processing are presented, representing
most of the current challenges in optical fiber sensing: (1) demodulation of individual
sensors, such as Fiber Bragg Gratings (FBGs) and Fabry-Perot Interferometers (FPIs);
(2) demodulation of dual (FBG/FPI) sensors; (3) application of reverse KLT to isolate
different sensors operating on the same spectrum. A simulative outline is provided to
demonstrate the KLT operation and estimate performance; a brief experimental section is
also provided to validate accurate FBG and FPI decoding.
Description
Keywords
optical fiber sensors (OFS), fiber Bragg grating (FBG), Fabry-Perot interferometry (FPI), optical signal processing, Karhunen-Loeve Transform (KLT), optical sensor demodulation
Citation
Tosi, D. Advanced Interrogation of Fiber-Optic Bragg Grating and Fabry-Perot Sensors with KLT Analysis. Sensors 2015, 15, 27470-27492.