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Proceedings Paper

Dynamic distributed measurement of temperature changes using phase-sensitive OTDR with chirped pulses
Author(s): Juan Pastor-Graells; Hugo F. Martins; Andres Garcia-Ruiz; Sonia Martin-Lopez; Miguel Gonzalez-Herraez
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Paper Abstract

A new and simple distributed fiber sensor which allows for the dynamic (single-shot) and quantitative measurement of perturbations is presented. It is based on a phase-sensitive OTDR using direct detection and linearly chirped pulses. Perturbations result in longitudinal shifts of the fiber trace, which can be calculated using a local correlation. As a proof of concept, distributed temperature variations of up to 5 Kelvin with millikelvin temperature resolutions over several minutes are demonstrated. Since the technique does not require a frequency sweep, operation ranging from dynamic strain measurements at kHz rates to temperature monitoring over several hours is readily envisaged.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162Q (30 May 2016); doi: 10.1117/12.2236192
Show Author Affiliations
Juan Pastor-Graells, Univ. de Alcalá (Spain)
Hugo F. Martins, FOCUS S. L. (Spain)
Andres Garcia-Ruiz, Univ. de Alcalá (Spain)
Sonia Martin-Lopez, Univ. de Alcalá (Spain)
Miguel Gonzalez-Herraez, Univ. de Alcalá (Spain)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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