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Proceedings Paper

Evaluation and calibration of FBG-based relative humidity sensor designed for structural health monitoring
Author(s): T. Venugopalan; T. L. Yeo; F. Basedau; A. S. Henke; T. Sun; K. T. V. Grattan; W. Habel
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Paper Abstract

In this paper, the evaluation and testing of a fibre optic relative humidity sensor specifically designed for structural health monitoring is discussed in detail. The sensor is based on a polymer coated Fibre Bragg Grating (FBG) where with the increase of the moisture level, the polymer coating swells and thus applies strain to the FBG, causing a Bragg wavelength shift. The device is designed so that the temperature effect on the humidity sensor can be compensated by the inclusion of a second un-coated FBG packaged inside the same sensor probe. The sensor thus produced has been tested extensively and calibrated using both a humidity chamber and standard salt solutions. The probe has demonstrated a very good performance for relative humidity measurements.

Paper Details

Date Published: 5 October 2009
PDF: 5 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750310 (5 October 2009); doi: 10.1117/12.835611
Show Author Affiliations
T. Venugopalan, City Univ. London (United Kingdom)
T. L. Yeo, City Univ. London (United Kingdom)
F. Basedau, Bundesanstalt für Materialforschung und -prüfung (Germany)
A. S. Henke, Bundesanstalt für Materialforschung und -prüfung (Germany)
T. Sun, City Univ. London (United Kingdom)
K. T. V. Grattan, City Univ. London (United Kingdom)
W. Habel, Bundesanstalt für Materialforschung und -prüfung (Germany)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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