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Proceedings Paper

Experimental study on humidity sensing using a FBG sensor with polyimide coating
Author(s): Fuxin Ding; Lutang Wang; Nian Fang; Zhaoming Huang
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Paper Abstract

Experimental studies on humidity measurements by using a FBG-based humidity sensor with multi-layer polyimide coating are demonstrated. As an important sensing application, the FBG humidity sensors have many unique advantages, such as immunity to electromagnetic interference and compact size, over the conventional electrical humidity sensor. In the detection principle, The Bragg wavelength of the FBG sensor shifts with the volume of the moisture absorbed by the polyimide film coated on the FBG. Experimental results show a good linear relationship between the shifts of the Bragg wavelength of FBG sensor and the changes in the relative humidity level. The preliminary experiments for investigating the performances of this polyimide-coating FBG humidity sensor were carried out and several experimental results in measurements of the relative humidity in air and moisture in oil are presented.

Paper Details

Date Published: 3 January 2011
PDF: 7 pages
Proc. SPIE 7990, Optical Sensors and Biophotonics II, 79900C (3 January 2011); doi: 10.1117/12.887827
Show Author Affiliations
Fuxin Ding, Shanghai Univ. (China)
Lutang Wang, Shanghai Univ. (China)
Nian Fang, Shanghai Univ. (China)
Zhaoming Huang, Shanghai Univ. (China)

Published in SPIE Proceedings Vol. 7990:
Optical Sensors and Biophotonics II
Qingming Luo; Frank Chuang; Stefan Haacke; Chih-Chung Yang, Editor(s)

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