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Proceedings Paper

Long-gauge strain sensors for underwater and deep-water applications
Author(s): Daniele Inaudi
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Paper Abstract

The evaluation of the structural performance of marine structures, such as ship hulls, off-shore platforms and risers requires the monitoring of the static and dynamic strain levels undergone during the whole lifetime. In these environments, the use of passive fiber optic sensors presents advantages in terms of reliability and multiplexing ability. Frequently used structural materials, such as steel and composites, exhibit local defects or discontinuities, such as welds, thickness / diameter variations, marine growths and cracks, introducing discontinuities in the mechanical properties of the material at a local level. Yet, the properties of the material at a global level are more indicative for structural behavior. Therefore, for structural monitoring purposes, it is necessary to use sensors that are insensitive to local material discontinuities. A long-gauge strain or deformation sensor, by definition, is a sensor with a gauge-length several times larger than the maximal distance between discontinuities or the maximal diameter of defects in the monitored material. In this paper we will present the design, testing and applications of a long-gauge fiber optics strain sensor for underwater applications.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77535R (17 May 2011); doi: 10.1117/12.887336
Show Author Affiliations
Daniele Inaudi, Smartec S.A. (Switzerland)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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