RT info:eu-repo/semantics/article
T1 Analysis of disturbance-induced "virtual" perturbations in chirped pulse φ-OTDR
A1 Marcon, Leonardo
A1 González Herráez, Miguel
A1 Soriano Amat, Miguel
A1 Veronese, Riccardo
A1 García Ruiz, Andrés
A1 Calabrese, Marco
A1 Pereira da Costa, Luis Duarte
A1 Fernández Ruiz, María del Rosario
A1 Fidalgo Martins, Hugo
A1 Palmieri, Luca
K1 Distributed Acoustic Sensing
K1 Phase-sensitive Optical Time Domain Reflectometry
K1 Rayleigh scattering
K1 Electrónica
K1 Electronics
AB When a disturbance acts on a fiber it induces a change in the local refractive index that influences the fiber backscattering trace. If a chirped pulse φ-OTDR setup is used to interrogate the fiber, this refractive index change appears as a local shift of the received trace, linear to the acting perturbation. However, the refractive index change influences the round trip time of all the backscattering components generated by further fiber sections as well. Due to the high sensitivity of chirped pulse φ-OTDR, the change in the round trip time of the backscattering components, which is usually negligible, may appear as a virtual perturbation in certain conditions. In this letter we derive a mathematical model for the virtual perturbation induced by a disturbance acting on the fiber, when the measurement is performed by a chirped pulse φ-OTDR. We experimentally validate the model by inducing a temperatura change on a known span of fiber while monitoring its effects in a further fiber section kept at rest. The experimental results are then analyzed and compared with the theoretical ones.
SN 1041-1135
YR 2019
FD 2019-12-31
LK http://hdl.handle.net/10017/41390
UL http://hdl.handle.net/10017/41390
LA eng
NO European Commission
DS MINDS@UW
RD 24-abr-2024