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Proceedings Paper

Development of a new structural monitoring system using optical fiber technology: prototype tests in the laboratory
Author(s): Nicole Metje; David N. Chapman; Christopher D. F. Rogers; Pifeng Miao; Stephen N. Kukureka; Phillip Henderson; Martin Beth
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Paper Abstract

Monitoring the movement of existing tunnels when new tunnel construction or other construction activities occur in close proximity is important to the tunnel owners. Existing manual monitoring systems, although considered most reliable, require access to the tunnel outside of passenger traffic hours and thus only provide measurements during a limited time of the day and under non-operational conditions. Remote monitoring systems, enabling 24 hour monitoring, are currently available based on electrolevels and automatic motorised theodolites. However, it is hoped that the proposed optical fibre sensor system will be more versatile and economic to install and operate. The underlying concept is based on a fibreglass rod containing optical fibres, with Fibre Bragg Gratings (FBG) written into them, which is fixed at discrete points to the tunnel lining. The movement of the tunnel induces a deformation of the rod, and hence strains the FBGs positioned at different points along the optical fibres. The FBGs work by reflecting narrow bands of light propagating along the optical fibres, the wavelength of the reflected light being a function of the strain at the position of the grating. This paper will discuss one experimental arrangement designed to explore the challenges of installing the monitoring system and interpreting the results. Results from tests are presented and discussed together with the sensitivity and accuracy achievable with the proposed system. Further, one method of interpreting the strain measurements and hence determining the displacement of the structure will be presented.

Paper Details

Date Published: 17 May 2005
PDF: 10 pages
Proc. SPIE 5765, Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (17 May 2005); doi: 10.1117/12.597629
Show Author Affiliations
Nicole Metje, The Univ. of Birmingham (United Kingdom)
David N. Chapman, The Univ. of Birmingham (United Kingdom)
Christopher D. F. Rogers, The Univ. of Birmingham (United Kingdom)
Pifeng Miao, The Univ. of Birmingham (United Kingdom)
Stephen N. Kukureka, The Univ. of Birmingham (United Kingdom)
Phillip Henderson, Smart Fibres Ltd. (United Kingdom)
Martin Beth, Sol Data (France)

Published in SPIE Proceedings Vol. 5765:
Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Masayoshi Tomizuka, Editor(s)

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