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Characterisation of a Nafion film by optical fibre Fabry–Perot interferometry for humidity sensing
Ist Teil von
Sensors and actuators. B, Chemical, 2014-06, Vol.196, p.99-105
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2014
Quelle
ScienceDirect
Beschreibungen/Notizen
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 242ms (3% RH variation) and a sensitivity of 3.5nm/%RH.