Acta Photonica Sinica, Volume. 42, Issue 9, 1046(2013)
Improvment Research of Fiber-optic Hydrogen Gas Sensor Using Pt Catalyzed Tungsten Trioxide
The hydrogen sensor probe is prepared by combining Pt-loaded WO3 coating with optimized synthesized process and enhanced temperature sensitivity fiber Bragg grating. In this way, the performance of the hydrogen sensor can be significantly improved. The experimental results show that Pt-loaded WO3 coating annealed under 315℃ for an hour has better sensitivity toward hydrogen when Pt∶W ratio is controlled at 1∶5. The temperature sensitivity of fiber Bragg grating which is enhanced by exerting axial prestress is 16.3 pm/℃, which is nearly twice of common fiber Bragg grating. When hydrogen concentration are 10 000 ppm, 2 000 ppm and 400 ppm, the wavelength shifts of fiber Bragg grating are 720 pm, 115 pm and 20 pm respectively, and fiber Bragg grating can reach its maxium wavelength shift within one minute. Moreover, the wavelength shift equal to 7.2 pm, 5.7 pm, 5 pm per 0.01% of H2 concentration and the therhold of hydrogen sensor can reach to 0.04%.
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LI Zhi, YANG Ming-hong, DAI Ji-xiang, YANG Zhi, ZHANG Yi, ZHUANG Zhi. Improvment Research of Fiber-optic Hydrogen Gas Sensor Using Pt Catalyzed Tungsten Trioxide[J]. Acta Photonica Sinica, 2013, 42(9): 1046
Received: Mar. 7, 2013
Accepted: --
Published Online: Dec. 18, 2013
The Author Email: Zhi LI (yilizhier@whut.edu.cn)