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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 414692, 12 pages
http://dx.doi.org/10.1155/2012/414692
Research Article

Performance Evaluation of PPP-BOTDA-Based Distributed Optical Fiber Sensors

1School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
2Department of Urban and Civil Engineering, Ibaraki University, Nakanarusawa-cho 4-12-1, Hitachi, Ibaraki 316-8511, Japan
3International Institute for Urban System Engineering, Southeast University, Nanjing, Jiangsu 210096, China

Received 30 August 2012; Accepted 16 November 2012

Academic Editor: Jeong-Tae Kim

Copyright © 2012 Hao Zhang and Zhishen Wu. 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.

Abstract

The basic sensing behaviors of Pulse-Prepump Brillouin Optical Time Domain Analysis- (PPP-BOTDA-) based distributed fiber optic sensors (DFOSs) with a spatial resolution on the order of 0.1 m are first experimentally studied. Second, the sensing results for different types of optical fibres are compared. Based on these investigations, the performance of PPP-BOTDA—based DFOSs for crack monitoring is evaluated. The experimental results show that in the interior of an optical fibre, slippage between the bare fiber and the coating materials occurs and that different types of optical fibres have different degrees of slippage. Point fixation bonding methods can produce effective and correct measurement results when the gauge length of the optical fibre is longer than the critical effective sensing length (CESL), whereas the overall bonding method is still not feasible for monitoring localized deformation quantitatively. Finally, the differences between Brillouin Optical Time Domain Reflectometry (BOTDR) and BOTDA are discussed.