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Proceedings Paper

Phase-shifted fiber-Bragg-grating-based humidity sensor
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Paper Abstract

A humidity fiber optic sensor based on phase-shifted (PS) fiber Bragg Gratings (FBG) is demonstrated in this paper. The sensor (PS-FBG) is coated with a moisture sensitive polyimide. When this thin coating is exposed to moisture its swells, hence inducing tensile stress on the PS-FBG and affecting its Bragg wavelength. Due to its intrinsic properties, the PS-FBG sensor presents the same trend of wavelength variation as standard fiber Bragg Grating sensor but with higher measurement resolution, and reliable measurements can be obtained in different humidity and temperature environments. This paper assesses the suitability, including sensitivity and response time, of the phaseshifted FBG sensor approach for humidity sensing. By monitoring this change, it is demonstrated that the humidity level of the environment can be accurately monitored.

Paper Details

Date Published: 31 May 2013
PDF: 7 pages
Proc. SPIE 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV, 872019 (31 May 2013); doi: 10.1117/12.2016600
Show Author Affiliations
Hao Wang, Univ. of Waterloo (Canada)
Honglei Guo, National Research Council Canada (Canada)
Gaozhi Xiao, National Research Council Canada (Canada)
Nezih Mrad, Defence Research and Development Canada, Ottawa (Canada)
Alex Kazemi, The Boeing Co. (United States)
Dayan Ban, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 8720:
Photonic Applications for Aerospace, Commercial, and Harsh Environments IV
Alex A. Kazemi; Bernard C. Kress; Simon Thibault, Editor(s)

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