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Sensors 2015, 15(11), 27470-27492; doi:10.3390/s151127470

Advanced Interrogation of Fiber-Optic Bragg Grating and Fabry-Perot Sensors with KLT Analysis

Nazarbayev University, School of Engineering, 010000 Astana, Kazakhstan
Academic Editor: Elfed Lewis
Received: 20 August 2015 / Revised: 19 October 2015 / Accepted: 24 October 2015 / Published: 29 October 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1417 KB, uploaded 29 October 2015]   |  

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. View Full-Text
Keywords: optical fiber sensors (OFS); fiber Bragg grating (FBG); Fabry-Perot interferometry (FPI); optical signal processing; Karhunen-Loeve Transform (KLT); optical sensor demodulation optical fiber sensors (OFS); fiber Bragg grating (FBG); Fabry-Perot interferometry (FPI); optical signal processing; Karhunen-Loeve Transform (KLT); optical sensor demodulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tosi, D. Advanced Interrogation of Fiber-Optic Bragg Grating and Fabry-Perot Sensors with KLT Analysis. Sensors 2015, 15, 27470-27492.

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