Open AccessSide-polished fiber Bragg grating hydrogen sensor with WO_3-Pd composite film as sensing materials
Author(s) -
Jixiang Dai,
Minghong Yang,
Yun Chen,
Kun Cao,
Hansheng Liao,
Pengcheng Zhang
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.006141
Subject(s) - materials science , fiber bragg grating , sputter deposition , optics , composite number , hydrogen , hydrogen sensor , fiber optic sensor , optical fiber , grating , amorphous solid , fiber , wavelength , optoelectronics , sputtering , composite material , thin film , nanotechnology , palladium , chemistry , physics , biochemistry , organic chemistry , catalysis
WO3-Pd composite films were deposited on the side-face of side-polished fiber Bragg grating as sensing elements by magnetron sputtering process. XRD result indicates that the WO3-Pd composite films are mainly amorphous. Compared to standard FBG coated with same hydrogen sensitive film, side-polished FBG significantly increase the sensor's sensitivity. When hydrogen concentrations are 4% and 8% in volume percentage, maximum wavelength shifts of side-polished FBG are 25 and 55 pm respectively. The experimental results show the sensor's hydrogen response is reversible, and side-polished FBG hydrogen sensor has great potential in hydrogen's measurement.