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Coating based Fiber Bragg Grating humidity sensor array

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Author: Cheng, L.K. · Boersma, A. · Jansen, T.H.
Source:22nd International Conference on Optical Fiber Sensor, Beijing, China, 15-10 October, 2012
Identifier: 462829
Keywords: Electronics · bragg grating · chemical sensor · humidiy · FBG · fober optics · Industrial Innovation · Physics & Electronics Fluid Mechanics Chemistry & Energetics · OPT - Optics RMC - Responsive Materials & Coating · TS - Technical Sciences


A coating based FBG humidity sensor is developed for distributed humidity sensing. The sensitivity of the coated FBG is optimized by varying the chemical composition and the thickness of the coating. A sensitivity of ~2 pm/%RH and a rapid response are demonstrated. The composition of the coating can be adapted for sensing other chemical elements. For the design and modeling of the responsive polymer coatings, a toolbox is developed. Using this toolbox, sensors for sour gas like CO2 and H2S for the Oil&Gas industry are developed. The results match well with the prediction.