Hydrogen Performance of Side-Polished Fiber Bragg Grating Sputtered with Pd/Ag Composite Film
Pd/Ag composite films are deposited on the side-face of side-polished fiber Bragg grating as sensing elements by magnetron sputtering process. The atomic ratio of the two metals is controlled at Pd:Ag=76:24. Compared to standard FBG coated with same hydrogen sensitive film, side-polished
FBG significantly increases the sensor's sensitivity. When hydrogen concentrations are 4% in volume percentage, the wavelength shifts of side-polished FBG are 8 and 18 pm respectively. The experimental results show the sensor's hydrogen response is reversible, and the hydrogen sensor has great
potential in hydrogen's measurement.
Document Type: Research Article
Publication date: 01 July 2012
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