硫化氢
材料科学
二硫化钼
膜
光纤传感器
纤维
氢
复合数
钼
光纤
化学工程
光学
硫黄
复合材料
化学
冶金
有机化学
物理
工程类
生物化学
作者
Rong Chen,Wenli Liu,Guojia Huang,Daoyuan Wang,Xiang Qin,Wenlin Feng
出处
期刊:Applied Optics
[The Optical Society]
日期:2018-11-15
卷期号:57 (33): 9755-9755
被引量:10
摘要
In this work, a novel hydrogen sulfide detection scheme based on tapered fiber seeded in two long-period fiber gratings (LPGs) coated by a molybdenum disulfide/citric acid composite membrane is proposed and fabricated. The input light of a broadband source is coupled twice by passing through two LPGs with identical parameters, from which a Mach–Zehnder interferometer can be formed. The composite sensitive membrane was prepared with molybdenum disulfide and citric acid, which was coated on the surface of the two LPGs. The experimental results show that in the range of 0–70 ppm of hydrogen sulfide, with the increase of gas concentrations the interference spectra appear to blueshift. In addition, a high sensitivity of 16.65 pm/ppm, an excellent linear relationship (R2=0.97721), and high selectivity for hydrogen sulfide are achieved. The effect of temperature is also discussed. The sensor has the advantages of low cost and small volume, and can be used for detection applications at sites where hydrogen sulfide is produced, such as natural gas plants, areas of magmatic activity, coal mines, etc.
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