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Proceedings Paper

Optical fiber sensors with Fabry-Perot thin film coating as sensitive element
Author(s): Minghong Yang; Xiaobing Li; Junjie Wang; Xinglin Tong
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Paper Abstract

A fiber-optic relative-humidity sensor composed of two silver coating and a polymer film is proposed and developed. Ag coatings are magnetically sputtered, and sandwiched by a dip-coated moisture-sensitive polyvinyl alcohol (PVA) film, which constructs a low-fineness Fabry-Perot sensing head. Experimental results show that interference fringe shifts to longer wavelength when relative humidity increases. The interference fringe shifts of two-layer sensor and three-layer sensor are 5.3 nm and 1.9 nm respectively. The linearity of interference fringe shift to relative humidity is averagely 0.9874.

Paper Details

Date Published: 8 October 2010
PDF: 5 pages
Proc. SPIE 7659, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, 765908 (8 October 2010); doi: 10.1117/12.867952
Show Author Affiliations
Minghong Yang, Wuhan Univ. of Technology (China)
Xiaobing Li, Wuhan Univ. of Technology (China)
Junjie Wang, Wuhan Univ. of Technology (China)
Xinglin Tong, Wuhan Univ. of Technology (China)


Published in SPIE Proceedings Vol. 7659:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing

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