Please use this identifier to cite or link to this item: http://repositorio.inesctec.pt/handle/123456789/7369
Title: Characterisation of a Nafion film by optical fibre Fabry-Perot interferometry for humidity sensing
Authors: Santos,JS
Raimundo,IM
Cordeiro,CMB
Biazoli,CR
Carlos Jesus Gouveia
Pedro Jorge
Issue Date: 2014
Abstract: Nafion has been evaluated as a sensing phase of an optical fibre humidity sensor based on a low-finesse Fabry-Perot interferometer. The sensor was constructed by manual deposition of a drop of a Nafion solution on the tip of a single mode optical fibre, forming a Fabry-Perot resonant cavity. The absorption of water by the Nafion film makes it swells, changing its refractive index and the length of the cavity, which produces a phase shift in the interference signal. The sensitivity, stability and response time of the sensor were evaluated in the RH range from 22 to 80% by analysing the correspondent reflection spectra of the interference fringes. As a result, it was obtained that Nafion can be used as sensing phase of an optical fibre humidity sensor based on optical fibre Fabry-Perot interferometry, presenting a response time of 242 ms (3% RH variation) and a sensitivity of 3.5 nm/%RH.
URI: http://repositorio.inesctec.pt/handle/123456789/7369
http://dx.doi.org/10.1016/j.snb.2014.01.101
metadata.dc.type: article
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