| 二氧化钛包覆无芯光纤的硫化氢气体传感器性能研究 |
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| 引用本文： | 刘敏,冯文林,黄国家,冯德玖.二氧化钛包覆无芯光纤的硫化氢气体传感器性能研究[J].红外与激光工程,2019,48(8):818003-0818003(5). |
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| 作者姓名： | 刘敏 冯文林 黄国家 冯德玖 |
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| 作者单位： | 1.重庆理工大学 理学院,重庆 400054; |
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| 基金项目： | 国家自然科学基金（51574054）;重庆市高校创新团队项目（CXTDX201601030）;国家质检总局项目（2017QK109）;广州市科技计划项目（201804010395） |
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| 摘 要： | 提出了一种基于二氧化钛薄膜包覆无芯光纤的硫化氢气体传感器。该传感器将两段不同长度的无芯光纤熔接在单模光纤两端，构建由两段单模光纤-无芯光纤-单模光纤结构组成的干涉仪。由于光从单模光纤进入无芯光纤中激发出不同阶模式，形成基于多模干涉的干涉仪，通过在无芯光纤外表面构造的二氧化钛薄膜对硫化氢气体的吸附，将气体浓度与干涉光谱的偏移联系起来，实现对硫化氢的检测。实验表明:在0~60 ppm的范围内获得了18.93 pm/ppm的灵敏度和良好的线性关系，且随着硫化氢浓度的增加，干涉谱呈现红移，响应和恢复时间分别约为80 s和110 s。该传感器具有结构简单、灵敏度高、制造方便等优点，在硫化氢气体的安全监测领域有潜在的应用价值。
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| 关 键 词： | 光纤传感 多模干涉 二氧化钛 硫化氢 |
| 收稿时间： | 2019-03-11 |
Performance study of hydrogen sulfide gas sensor based on titanium dioxide coated no-core fiber |
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| Affiliation: | 1.College of Science,Chongqing University of Technology,Chongqing 400054,China;2.Chongqing Key Laboratory of Green Energy Materials Technology and Systems,Chongqing 400054,China;3.Guangzhou Special Pressure Equipment Inspection and Research Institute,Guangzhou 510663,China |
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| Abstract: | A novel hydrogen sulfide gas sensor based on titanium dioxide membrane-coated coreless fiber was presented. The sensor was fabricated by two different length no-core fibers (NCFs) which were spliced both ends with single-mode fibers (SMFs) and then constructed an interferometer with the structure of SMF-NCF-SMF. Different modes can be excited in the coreless fiber when the light traveled from SMF to NCF, an interferometer based on multimode interference was formed. The titanium dioxide film was coated on the outside surface of NCF which could adsorb hydrogen sulfide gas, then the relation between gas concentration and spectral shift was obtained, and thus the detection of hydrogen sulfide gas was performed. The experimental results show that a high sensitivity of 18.93 pm/ppm and a good linear relationship are achieved in the range of 0 to 60 ppm, and the interference spectra appear red shift with the increasing concentration of hydrogen sulfide. The rising time and falling time of the sensor are about 80 s and 110 s. The sensor has the advantages of simple structure, high sensitivity and easy manufacture, and can be used in the safety monitoring field of tracing hydrogen sulfide gas. |
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