期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 169, 期 -, 页码 167-172出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.04.052
关键词
Fabry-Perot interferometer; Chitosan; Humidity sensing
A relative humidity fiber sensor based on Fabry-Perot interferometry configuration is presented. The proposed fiber sensor is functionalized with a thin layer of a moisture-sensitive natural polymer chitosan to form a low fineness Fabry-Perot sensor. The sensing scheme used in this work is based on the swelling effect of chitosan sensing film (degree of swelling varies as a function of relative humidity) which will induce optical path modulation when relative humidity is changed. As observed, the proposed sensor exhibits a sensitivity of 0.13 nm/%RH for relative humidity ranging from 20%RH to 95%RH with a RH uncertainty of +/- 1.68%RH and fast response time of 380 ms. (C) 2012 Elsevier B.V. All rights reserved.
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