Speckle Analysis Method for Distributed Detection of Temperature Gradients With \Phi OTDR

A method to extend the operation of traditional single-frequency phase-sensitive optical time-domain reflectometry (ΦOTDR) to the monitoring of distributed temperature gradients along an optical fiber is proposed and experimentally validated. The measurement principle is derived from the perturbatio...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-09, Vol.28 (18), p.2000-2003
Main Authors: Garcia-Ruiz, Andres, Pastor-Graells, Juan, Martins, Hugo F., Martin-Lopez, Sonia, Gonzalez-Herraez, Miguel
Format: Article
Language:English
Subjects:
Computational efficiency
Distributed fiber sensing
Frequency scanning
Hardware
Monitoring
Optical fiber
Optical fibers
Perturbation methods
phase-sensitive OTDR
Signal processing
Speckle theory
Temperature gradient
Temperature sensing
Time domain analysis
Vibration
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Summary:A method to extend the operation of traditional single-frequency phase-sensitive optical time-domain reflectometry (ΦOTDR) to the monitoring of distributed temperature gradients along an optical fiber is proposed and experimentally validated. The measurement principle is derived from the perturbation response of a single-wavelength ΦOTDR signal, which is analyzed as a unidimensional speckle pattern. The method could be implemented in parallel to standard ΦOTDR systems used for distributed vibration sensing with a close to zero cost and without affecting its operation, as it only requires a low computational cost post-processing of the traces which are already acquired. Frequency scanning of the laser, heterodyning or additional hardware are not required. The distributed detection of a temperature gradient of 2.5 °C over 10 min is demonstrated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2578043