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. 2015 Apr 13;15(4):8499–8511. doi: 10.3390/s150408499

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Normalized SPR spectra acquired by the POF-MIP sensor P2 for different furfural (2-FAL) concentrations in ppm in fresh oil and in two serviced transformer oils (CT.134 and CT.729). Inset: zoom of resonance wavelengths.