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Proceedings Paper

FBGs cascade interrogation technique based on wavelength-to-delay mapping and KLT analysis
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Paper Abstract

The Karhunen-Loeve transform is applied to the coarsely sampled impulse response generated by an FBG cascade in order to calculate the temperature change suffered by the FBGs. Thanks to a dispersive media, the wavelength change performed by the temperature change produces a delay shift in the sample generated by an FBG, delay shift which is recorded in the eigenvalues calculated by the KLT routine, letting to measure the temperature variation. Although the FBGs samples are represented only by four points, a continuous temperature measurement can be performed thanks to the KLT algorithm. This means a three order reduction in the number of points giving this method a low computational complexity. Simulations are performed to validate the interrogation technique and estimate performance and an experimental example is provided to demonstrate real operation.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991628 (30 May 2016); doi: 10.1117/12.2236903
Show Author Affiliations
J. Hervás, Univ. Politècnica de València (Spain)
D. Barrera, Univ. Politècnica de València (Spain)
Carlos R. Fernández-Pousa, Univ. Miguel Hernández de Elche (Spain)
S. Sales, Univ. Politècnica de València (Spain)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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