Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 196, Issue -, Pages 99-105Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.01.101
Keywords
Relative humidity sensor; Interferometry; Fabry-Perot; Nafion
Funding
- INCTAA (CNPq) [573894/2008-6]
- INCTAA (FAPESP) [2008/57808-1]
- Fotonicom
- CePOF
- CAPES
- FAPESP [11/00322-2]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/00322-2] Funding Source: FAPESP
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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.
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