Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 28, Issue 18, Pages 2000-2003Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2016.2578043
Keywords
Distributed fiber sensing; temperature sensing; phase-sensitive OTDR; speckle theory; signal processing
Funding
- European Research Council through the UFINE Project [307441]
- Secretaria de Estado de Investigacion, Desarrollo e Innovacion within the Spanish Ministry of Economy and Competitiveness [TEC2013-45265-R]
- Comunidad de Madrid [S2013/MIT-2790]
- Spanish MINECO through the Formacion de Personal Investigador Contract
- European Commission [608099]
- Spanish MINECO through a Ramon y Cajal Contract
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A method to extend the operation of traditional single-frequency phase-sensitive optical time-domain reflectometry (Phi OTDR) 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 Phi OTDR signal, which is analyzed as a unidimensional speckle pattern. The method could be implemented in parallel to standard Phi OTDR 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 degrees C over 10 min is demonstrated.
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