%0 Journal Article %A Soriano Amat, Miguel %A Marcon, Leonardo %A Pereira da Costa, Luis Duarte %A García Ruiz, Andrés %A Fidalgo Martins, Hugo %A Martín López, Sonia %A Palmieri, Luca %A González Herráez, Miguel %T Characterization and modelling of induced "virtual" perturbations in chirped pulse φ-OTDR %D 2019 %@ 0277-786X %U http://hdl.handle.net/10017/39686 %X Any temperature change or strain acting on a section of the fiber induces a local variation of the refractive index. If the fiber is monitored by a chirped pulse φ-OTDR system, the variation of the refractive index causes a local shift of the backscattering trace and produces a change in the round trip time of the light coming from any further position of the fiber. While usually negligible, due to the high sensitivity of the chirped pulse φ-OTDR, in extreme occasions the distributed round trip time change may appear in the measurement as an undesired “virtual” perturbation. In this paper, we discuss and experimentally validate a mathematical model to account for (and eventually correct) the “virtual” perturbation. %K Phase-sensitive OTDR %K Rayleigh scattering %K Distributed Acoustic Sensing %K Electrónica %K Electronics %~ Biblioteca Universidad de Alcala