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Sensors 2017, 17(2), 355; doi:10.3390/s17020355

A Novel Fiber Optic Based Surveillance System for Prevention of Pipeline Integrity Threats

1
FOCUS S.L., 28804 Madrid, Spain
2
Department of Electronics, University of Alcalá, 28801 Alcalá de Henares, Spain
3
Instituto de Óptica, CSIC, 28006 Madrid, Spain
Current address: Department of Information Technology, University CEU San Pablo, 28003 Madrid, Spain.
*
Author to whom correspondence should be addressed.
Academic Editor: Elfed Lewis
Received: 24 November 2016 / Revised: 12 January 2017 / Accepted: 9 February 2017 / Published: 12 February 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1251 KB, uploaded 12 February 2017]   |  

Abstract

This paper presents a novel surveillance system aimed at the detection and classification of threats in the vicinity of a long gas pipeline. The sensing system is based on phase-sensitive optical time domain reflectometry (ϕ-OTDR) technology for signal acquisition and pattern recognition strategies for threat identification. The proposal incorporates contextual information at the feature level and applies a system combination strategy for pattern classification. The contextual information at the feature level is based on the tandem approach (using feature representations produced by discriminatively-trained multi-layer perceptrons) by employing feature vectors that spread different temporal contexts. The system combination strategy is based on a posterior combination of likelihoods computed from different pattern classification processes. The system operates in two different modes: (1) machine + activity identification, which recognizes the activity being carried out by a certain machine, and (2) threat detection, aimed at detecting threats no matter what the real activity being conducted is. In comparison with a previous system based on the same rigorous experimental setup, the results show that the system combination from the contextual feature information improves the results for each individual class in both operational modes, as well as the overall classification accuracy, with statistically-significant improvements. View Full-Text
Keywords: distributed acoustic sensing; fiber optic systems; ϕ-OTDR; pipeline integrity threat monitoring; feature-level contextual information; system combination distributed acoustic sensing; fiber optic systems; ϕ-OTDR; pipeline integrity threat monitoring; feature-level contextual information; system combination
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tejedor, J.; Macias-Guarasa, J.; Martins, H.F.; Piote, D.; Pastor-Graells, J.; Martin-Lopez, S.; Corredera, P.; Gonzalez-Herraez, M. A Novel Fiber Optic Based Surveillance System for Prevention of Pipeline Integrity Threats. Sensors 2017, 17, 355.

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