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Proceedings Paper

Feasibility study of the automated detection and localization of underground tunnel excavation using Brillouin optical time domain reflectometer
Author(s): Assaf Klar; Raphael Linker
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Paper Abstract

Cross-borders smuggling tunnels enable unmonitored movement of people, drugs and weapons and pose a very serious threat to homeland security. Recent advances in strain measurements using optical fibers allow the development of smart underground security fences that could detect the excavation of smuggling tunnels. This paper presents the first stages in the development of such a fence using Brillouin Optical Time Domain Reflectometry (BOTDR). In the simulation study, two different ground displacement models are used in order to evaluate the robustness of the system against imperfect modeling. In both cases, soil-fiber interaction is considered. Measurement errors, and surface disturbances (obtained from a field test) are also included in the calibration and validation stages of the system. The proposed detection system is based on wavelet decomposition of the BOTDR signal, followed by a neural network that is trained to recognize the tunnel signature in the wavelet coefficients. The results indicate that the proposed system is capable of detecting even small tunnel (0.5m diameter) as deep as 20 meter.

Paper Details

Date Published: 27 April 2009
PDF: 12 pages
Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 731603 (27 April 2009); doi: 10.1117/12.810781
Show Author Affiliations
Assaf Klar, Technion-Israel Institute of Technology (Israel)
Raphael Linker, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 7316:
Fiber Optic Sensors and Applications VI
Eric Udd; Henry H. Du; Anbo Wang, Editor(s)

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