An in-line Mach-Zehnder Interferometer Using Thin-core Fiber for Ammonia Gas Sensing With High Sensitivity

• DOI: 10.1038/srep44994
• Publication Date: 2017-04-05T12:28:37Z
• Authors: Xinyue Huang; Xueming Li; Jianchun Yang; Chuanyi Tao; Xiaogang Guo; Hebin Bao; Yanjun Yin; Huifei Chen; Yuhua Zhu
• Keywords: Fusion splicing

Abstract Ammonia is an important indicator among environmental monitoring parameters. In this work, thin-core fiber Mach-Zehnder interferometer deposited with poly (acrylic acid) (PAA), (allyamine hydrochloride) (PAH) and single-walled carbon nanotubes (SWCNTs-COOH) sensing film for the detection of ammonia gas has been presented. The modal was made by fusion splicing a small section (TCF) between two standard single mode fibers (SMF). A beam propagation method (BPM) employed design proposed numerical simulation. Based on simulation results, length 2 cm fabricated experimentally studied. (PAH/PAA) + [PAH/(PAA SWCNTs-COOH)] 8 outer surface via layer-by-layer (LbL) self-assembly technique. sensor coated towards NH 3 exposure at concentrations range from 1 to 960 ppm are analyzed capability demonstrated optical spectrum analyzer (OSA). Experimental results show that characteristic wavelength shift approximately linear relationship in 1–20 ppm, which accordance Thus, paper reveals potential application low concentration gas.