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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterisation of a Nafion film by optical fibre Fabry-Perot interferometry for humidity sensing

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Santos, Juliana S. [1] ; Raimundo, Jr., Ivo M. [1] ; Cordeiro, Cristiano M. B. [2] ; Biazoli, Claudecir R. [2] ; Gouveia, Carlos A. J. [3] ; Jorge, Pedro A. S. [3]
Total Authors: 6
[1] Univ Estadual Campinas, Inst Chem, UNICAMP, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Phys Gleb Wataghin, UNICAMP, BR-13083859 Campinas, SP - Brazil
[3] INESC Porto, P-4169007 Oporto - Portugal
Total Affiliations: 3
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 196, p. 99-105, JUN 2014.
Web of Science Citations: 33

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. (AU)

FAPESP's process: 11/00322-2 - Development of an optical sensor for determination of moisture in air and natural gas
Grantee:Juliana Santiago dos Santos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 08/57808-1 - National Institute of Advanced Analytical Science and Technology
Grantee:Celio Pasquini
Support type: Research Projects - Thematic Grants