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Type: Artigo de periódico
Title: Characterisation of a Nafion film by optical fibre Fabry-Perot interferometry for humidity sensing
Author: Santos, JS
Raimundo, IM
Cordeiro, CMB
Biazoli, CR
Gouveia, CAJ
Jorge, PAS
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. (C) 2014 Elsevier B.V. All rights reserved.
Subject: Relative humidity sensor
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.snb.2014.01.101
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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