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Proceedings Paper

Structural concrete condition monitoring using a long period grating-based humidity sensor
Author(s): T. Venugopalan; T. Sun; K. T. V. Grattan
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Paper Abstract

An optically based sensor has been designed, fabricated and characterized in research to determine moisture ingress in a range of structural concrete samples subjected to a variety of changing environmental conditions. The approach taken to the creation of these novel humidity sensors is using long period grating (LPG) technology in an optical fibre. The sensor is configured by coating LPGs with a thin layer of polymer, following which it was characterized and its performance cross-compared with that of other sensors. The thin layer of polyvinyl alcohol (PVA), whose refractive index varies as a function of humidity level, provides a means to change the optical propagation in the fibre and thus to induce the a wavelength shift in the attenuation bands of its transmission spectrum.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70045N (16 May 2008); doi: 10.1117/12.786554
Show Author Affiliations
T. Venugopalan, City Univ. (United Kingdom)
T. Sun, City Univ. (United Kingdom)
K. T. V. Grattan, City Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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