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. 2017 Aug 18;7:8766. doi: 10.1038/s41598-017-08853-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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OFDR measure: from Rayleigh pattern to spectral shift information. (a) Schematic representation of OFDR system interrogating the sensing fibre which Rayleigh recorded pattern is reported in (b) for a reference state (dotted black line) and perturbed state (red line). The information carried in the phase is reconstructed, for each sensing element, by a Fourier transform. (c) Frequency spectra for one sensing element. (d) Cross-correlation of frequency spectra with respect to the reference one.