光学
光纤传感器
灵敏度(控制系统)
干扰(通信)
双折射
折射率
材料科学
光纤
磁场
马赫-曾德尔干涉仪
光子晶体光纤
干涉测量
物理
电信
电子工程
量子力学
计算机科学
频道(广播)
工程类
作者
Qi Yu,Xuegang Li,Xue Zhou,Xinjie Gao,Ri-Qing Lv,Linh V. Nguyen,Stephen C. Warren‐Smith,Yong Zhao
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2022-04-21
卷期号:47 (10): 2558-2558
被引量:11
摘要
In this paper, a highly sensitive temperature compensated fiber optic magnetic field sensor by Sagnac and Mach-Zehnder combination interference (SMZI) is proposed and verified. The sensing structure relies on microstructured exposed core fiber (ECF) filled with ethanol and magnetic fluid (MF). The refractive index of MF and ethanol is affected by the magnetic field and temperature (MFT). SMZI is based on the multimode and birefringence characteristics of ECF. The measurement principle is that the spectra of Sagnac interference and Mach-Zehnder interference have respective sensitivities to the MFT. The magnetic sensitivity can reach 1.17 nm/mT, and the temperature sensitivity is up to -1.93 nm/°C. At the same time, the sensor has good repeatability and low detection limits of 0.41 mT and 0.25°C, respectively. It not only solves the cross-influence of temperature but also makes the spectral analysis more intuitive. The sensor has a broad development prospect in the application of MFT detection.
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