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Humidity fiber sensors based on superstructure fiber Bragg gratings coated with porous sol gel

✍ Scribed by Lung Ai; Wen-Fung Liu; Ming-Yue Fu; Tzu-Chiang Chen

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
143 KB
Volume
51
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A fiber sensor based on an etched superstructure fiber Bragg grating coated with the thin film of sol–gel is used for measuring the relative humidity. The operation mechanism of this sensor is based on that sol–gel materials can react with H~2~O molecules to result in its reflective index change and then to cause both Bragg wavelength shift. The diameter of the superstructure fiber Bragg grating is etched down to 20 μm for obtaining the sensitivity of 0.014 nm/1%RH. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 40–42, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23973

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