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Proceedings Paper

Characterization of a polyimide-coated humidity sensor in a hybrid fibre grating configuration
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Paper Abstract

A Relative Humidity (RH) sensor incorporating a Long Period Grating (LPG) and a Fibre Bragg Grating (FBG) in a series configuration was developed and evaluated. The LPG was coated with polyimide allowing it to respond to humidity changes while the FBG is used for temperature compensation. The hybrid sensor was then tested over the change in RH from 20-95 % and temperature of 20-80 °C. The sensitivity of the hybrid sensor to temperature and RH were determined to be 9 pm/°C and 0.23 nm/%RH, with negligible hysteresis (<1% RH), showing the value of the dual LPG/FBG approach to optimize sensitivity.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963462 (28 September 2015); doi: 10.1117/12.2193678
Show Author Affiliations
Lourdes Alwis, Edinburgh Napier Univ. (United Kingdom)
Tong Sun, City Univ. London (United Kingdom)
Kenneth T. V. Grattan, City Univ. London (United Kingdom)


Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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