%0 Journal Article %A García Ruiz, Andrés %A Pastor Graells, Juan %A Fidalgo Martins, Hugo %A Martín López, Sonia %A González Herráez, Miguel %T Distributed detection of temperature gradients with single-wavelength phase-sensitive OTDR and speckle analysis methods %D 2016 %U http://hdl.handle.net/10017/25757 %X A method to evaluate distributed temperature gradients along an optical fiber using phase-sensitive optical time domain reflectometry (PhiOTDR) with direct detection is proposed and experimentally validated. The measurement principle derives from the perturbation response of a single-wavelength PhiOTDR 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 PhiOTDR traces and requires no scanning of the laser frequency. This post-processing method can be implemented over a conventional PhiOTDR system used for distributed intrusion detection, without affecting its operation or requiring any additional hardware. %K Sensores distribuidos de fibra óptica %K Medida de temperatura %K OTDR sensible a fase %K Reflectometría óptica en dominio temporal %K Teoría de speckle %K Procesado de señal %K Distributed fiber sensing %K Phase-sensitive OTDR %K Signal processing %K Speckle theory %K Temperature sensing %K Electrónica %K Electronics %~ Biblioteca Universidad de Alcala