Open AccessHigh sensitivity fiber sensor for measurement of Cd2+ concentration in aqueous solution based on reflective Mach-Zehnder interference with temperature calibration
Author(s) -
Zizhao Pan,
Jianxun Feng,
Xiduo Hu,
Chuanyu Jia,
Xuguang Huang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.032621
Subject(s) - materials science , optics , fiber optic sensor , fiber bragg grating , tapering , optical fiber , fiber , interference (communication) , calibration , temperature measurement , sensitivity (control systems) , graded index fiber , photonic crystal fiber , fusion splicing , aqueous solution , chemistry , telecommunications , physics , channel (broadcasting) , computer graphics (images) , quantum mechanics , electronic engineering , computer science , composite material , engineering
We propose a novel fiber chemical sensing system based on reflective Mach-Zehnder interference with temperature calibration for the measurement of Cd 2+ in aqueous solution. The sensing system has high measurement sensitivity of Cd 2+ with an estimated minimum detection limit of 4×10 -7 mol/L at a spectral resolution of 0.02 nm and with long-term stability. The fiber sensing head is prepared by coating a sensing membrane on a fused tapering single-mode fiber. The thiourea group of the sensing membrane has an effective combination effect on Cd 2+ . Disturbance from ambient temperature fluctuation on the measurement of Cd 2+ concentration can be eliminated with the fiber Bragg grating.