30 May 2016 Distributed detection of temperature gradients with single-wavelength phase-sensitive OTDR and speckle analysis methods
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99162R (2016) https://doi.org/10.1117/12.2236206
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
Abstract
A method to evaluate distributed temperature gradients along an optical fiber using phase-sensitive optical time domain reflectometry (ΦOTDR) with direct detection is proposed and experimentally validated. The measurement principle derives from the perturbation response of a single-wavelength ΦOTDR signal, which is analyzed as a unidimensional speckle pattern. Our method can be implemented in real-time, relies solely on a low-cost post-processing of the standard ΦOTDR traces and requires no scanning of the laser frequency. This post-processing method can be implemented over a conventional ΦOTDR system used for distributed intrusion detection, without affecting its operation or requiring any additional hardware.
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Andres Garcia-Ruiz, Juan Pastor-Graells, Hugo F. Martins, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, "Distributed detection of temperature gradients with single-wavelength phase-sensitive OTDR and speckle analysis methods", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162R (30 May 2016); doi: 10.1117/12.2236206; https://doi.org/10.1117/12.2236206
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