Abstract
Pd/Ag and Pd/Y composite films were deposited on the side-face of side-polished fiber Bragg grating (FBG) as sensing elements with magnetron sputtering process. Compared to standard FBG coated with same hydrogen sensitive film, side-polished FBG significantly increase the sensor's sensitivity. When hydrogen concentration is 4% in volume percentage, the wavelength shifts of side-polished FBG sputtered with Pd/Ag and Pd/Y are 18 and 23 pm respectively. The experimental results show the hydrogen sensor coated with Pd/Y composite film has higher sensitivity and quicker response rate, and the sensor's hydrogen response is reversible. The side-polished FBG hydrogen sensor with Pd-based composite films has great potential in measurement and monitor of hydrogen concentration.
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