Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/12956
Title: Improvements on the cross-correlation algorithm used for tracking fractional Bragg grating wavelength shifts in multimode fibres
Authors: Theodosiou, Antreas 
Komodromos, Michael 
Kalli, Kyriacos 
Major Field of Science: Engineering and Technology
Field Category: Materials Engineering
Keywords: Bragg grating sensors;Cross-correlation;Demodulation algorithm;Optical fibre sensors;Smoothing filter
Issue Date: Dec-2018
Source: Optical Fiber Technology, 2018, vol. 46, pp. 36-42
Volume: 46
Start page: 36
End page: 42
DOI: https://doi.org/10.1016/j.yofte.2018.09.008
Journal: Optical Fiber Technology 
Abstract: In this paper we report on the deployment of Finite Impulse Response (FIR) filters as an extension to the common cross-correlation algorithm (CCA), for accurate peak tracking of multimode and single mode fibre Bragg gratings when dealing with wavelength shifts below the sampling resolution of the demodulator; the well-known peak-locking effect. The performance of the common CCA under these conditions was studied using simulations for single and multiple peak grating spectra and was compared with the performance of proposed, improved CCA method. We studied the cases where fibre Bragg gratings are wavelength-shifted with triangular and sinusoidal manner and how the proposed method behaves under these conditions. We experimentally evaluated our proposed method by utilising strain measurements using a fibre Bragg grating inscribed in a multimode gradient index CYTOP polymer fibre. The method and algorithm showed significant improvement concerning the peak-locking effect, while maintaining the response speed.
ISSN: 10685200
DOI: 10.1016/j.yofte.2018.09.008
Rights: © Elsevier Inc.
Type: Article
Affiliation : Frederick University 
Cyprus University of Technology 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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