光子学报, 2013, 42 (9): 1046, 网络出版: 2013-12-18   

Pt/WO3光纤光栅氢气传感器改性研究

Improvment Research of Fiber-optic Hydrogen Gas Sensor Using Pt Catalyzed Tungsten Trioxide
作者单位
1 武汉理工大学 光纤传感国家工程实验室, 武汉 430070
2 中国工程物理研究院, 四川 绵阳 621907
摘要
将优化制备工艺的Pt/WO3薄膜与增敏的光纤光栅相结合制备氢气传感器探头, 使传感器的性能得到大幅改进.氢敏测试实验结果表明: 经过315℃热处理铂钨比为1∶5的Pt/WO3薄膜具有更好的氢气响应能力;经过施加轴向预应力结构增敏的光纤光栅温度灵敏度为16.3 pm/℃, 大约是裸光栅的两倍;改性后的光纤光栅氢气传感器在氢气浓度为10 000 ppm、2 000 ppm、400 ppm时, 中心波长漂移量分别对应为720 pm、115 pm、20 pm, 并在1 min内达到最大漂移值, 氢气浓度每变化0.01%, 波长漂移分别达到7.2 pm、5.7 pm、5 pm, 氢气最低检测极限可达到0.04%.
Abstract
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%.

李智, 杨明红, 代吉祥, 杨志, 张毅, 庄志. Pt/WO3光纤光栅氢气传感器改性研究[J]. 光子学报, 2013, 42(9): 1046. 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.

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