Side-polished fiber Bragg grating hydrogen sensor with WO_3-Pd composite film as sensing materials
2011; Optica Publishing Group; Volume: 19; Issue: 7 Linguagem: Inglês
10.1364/oe.19.006141
ISSN1094-4087
AutoresJixiang Dai, Minghong Yang, Yun Chen, Kun Cao, Hansheng Liao, Pengcheng Zhang,
Tópico(s)Advanced Sensor and Control Systems
ResumoWO3-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.
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