Pt/WO_3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：李智[1] 杨明红[1] 代吉祥[1] 杨志[1] 张毅[2] 庄志[2] 

机构地区：[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

出　　处：《光子学报》2013年第9期1046-1051,共6页Acta Photonica Sinica

基　　金：国家自然科学基金重大项目(No.62190311);教育部新世纪优秀人才计划(No.NECT-10-0664)资助

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16.3pm/℃,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 000ppm、2 000ppm、400ppm时,中心波长漂移量分别对应为720pm、115pm、20pm,并在1min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7.2pm、5.7pm、5pm,氢气最低检测极限可达到0.04%.The hydrogen sensor probe is prepared by combining Pt-loaded WO3 coating wltn 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%.

关 键 词：PT WO3薄膜 温度增敏 氢敏性能 光纤布喇格光栅 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]