材料科学
石墨烯
折射率
光纤
光纤传感器
干涉测量
光电子学
栅栏
灵敏度(控制系统)
光学
分析化学(期刊)
纳米技术
物理
化学
电子工程
工程类
色谱法
作者
Mandeep Singh,Sanjeev Kumar Raghuwanshi,Om Prakash
标识
DOI:10.1109/lpt.2019.2932764
摘要
In this letter, we develop two types of refractive index based sensors using single-mode fiber (SMF-28) to sense hazardous toxic gases in underground mines. The first sensor design is simply a graphene-oxide (GO) deposited long period grating (LPG) and second sensor consist of two LPGs with an interspacing distance of 1 cm (Al) acting as Mach-Zehnder interferometer (MZI). In addition, we also confirm GO deposition on the SMF using ultraviolet-visible spectroscopy, atomic force microscopy (AFM), and field emission scanning electron micrograph (FESEM). Our experiment results show that the sensitivity of two-LPGs based fiber optic sensor (S LPG-2 = 76.32 dB/RIU) is higher as compared to the single LPG sensor (S LPG-1 = 54.65 dB/RIU). Hence, reported graphene oxide deposited long period grating sensor possess better sensitivity and can detect maximum 1.52 × 10 -5 index variation in the optical telecommunication band.
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