Acta Photonica Sinica, Volume. 40, Issue 7, 1003(2011)
Hydrogen Sensor Based on Dshaped Fiber Bragg Grating Coated with WO3Pd Composite Films
40 nm WO3Pd composite film was sputtered on the sideface of sidepolished fiber Bragg grating (Dshaped FBG). The FBG sensing head with 40 nm WO3Pd composite film was firstly prepared by a 5 nm WO3 coating realized with radio frequency(RF)sputtering process, followed by depositing 5 nm WO3/Pd composite film, and then finished with 30 nm Pd film by directcurrent(DC) sputtering method. SEM results show that WO3Pd composite film still has good surface morphology after several cycle′s hydrogen response, which indicates WO3Pd composite film has good mechnical property. The experiment results demonstrate hydrogen sensor has good repeatability under different concentration hydrogen. Compared to standard FBG coated with same hydrogen sensitive film, the sensitivity of Dshaped FBG is increased by 200%. When the hydrogen concentration is 6% in volume, the wavelength shift of Dshaped FBG is about 15 pm. Dshaped FBG hydrogen sensor has great potential in hydrogen′s measurement.
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DAI Jixiang, YANG Minghong, CHEN Yun, CAO Kun, LIAO Junsheng, HANG Pengcheng. Hydrogen Sensor Based on Dshaped Fiber Bragg Grating Coated with WO3Pd Composite Films[J]. Acta Photonica Sinica, 2011, 40(7): 1003
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Published Online: Aug. 10, 2011
The Author Email: Jixiang DAI (djx409081947@163.com)