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TitleInvestigation of polyimide coated fibre Bragg gratings for relative humidity sensing
Publication TypeJournal Article
Year of Publication2015
AuthorsSwanson, A.J., Raymond S.G., Janssens S., Breukers R.D., Bhuiyan M.D.H., Lovell-Smith J.W., and Waterland M.R.
JournalMeasurement Science and Technology
Date Published2015
ISSN09570233 (ISSN)
KeywordsBragg gratings, Coating thickness, Coatings, Coefficient of moisture expansion, Fiber Bragg gratings, Fibre diameters, Humidity response, Humidity sensors, Optical fibers, Polyimide coating, Polyimides, Thickness measurement, time response
AbstractThis paper reports the development of a polyimide coated fibre Bragg grating for relative humidity sensing. The humidity response was measured for several polyimide coatings including P84 and P84 HT. The P84 HT polyimide coating proved the most promising with a large coefficient of moisture expansion measured at 73.8 ppm/%rh. The effect of coating thickness and optical fibre diameter were also investigated. © 2015 IOP Publishing Ltd.

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