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

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 H2O molecules to result in its reflective index change and t...

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Bibliographic Details
Published in:Microwave and optical technology letters 2009-01, Vol.51 (1), p.40-42
Main Authors: Ai, Lung, Liu, Wen-Fung, Fu, Ming-Yue, Chen, Tzu-Chiang
Format: Article
Language:English
Subjects:
fiber sensors
humidity
sol-gel
superstructure fiber Bragg grating
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Summary: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 H2O 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
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.23973