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Proceedings Paper

Characterization and modelling of induced virtual perturbations in chirped pulse φ-OTDR
Author(s): Miguel Soriano-Amat; Leonardo Marcon; Luis Costa; Andres Garcia-Ruiz; Hugo F. Martins; Sonia Martin-Lopez; Luca Palmieri; Miguel Gonzalez-Herraez
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Paper Abstract

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.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111992A (28 August 2019); doi: 10.1117/12.2540760
Show Author Affiliations
Miguel Soriano-Amat, Univ. de Alcalá (Spain)
Leonardo Marcon, Univ. degli Studi di Padova (Italy)
Luis Costa, Univ. de Alcalá (Spain)
Andres Garcia-Ruiz, Univ. de Alcalá (Spain)
Hugo F. Martins, Instituto de Óptica (Spain)
Sonia Martin-Lopez, Univ. de Alcalá (Spain)
Luca Palmieri, Univ. degli Studi di Padova (Italy)
Miguel Gonzalez-Herraez, Univ. de Alcalá (Spain)

Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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