基于 3×3 耦合器和铁基非晶纳米晶 ribbon 的光纤磁场传感器。

Optical Fiber Magnetic Field Sensors Based on 3 × 3 Coupler and Iron-Based Amorphous Nanocrystalline Ribbons.

机构信息

State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.

Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Sensors (Basel). 2023 Feb 24;23(5):2530. doi: 10.3390/s23052530.

DOI:10.3390/s23052530

PMID:36904733

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10007690/

Abstract

Optical fiber interferometric magnetic field sensors based on magnetostrictive effects have several advantages, e.g., high sensitivity, strong adaptability to harsh environments, long distance transmission, etc. They also have great application prospects in deep wells, oceans, and other extreme environments. In this paper, two optical fiber magnetic field sensors based on iron-based amorphous nanocrystalline ribbons and a passive 3 × 3 coupler demodulation system were proposed and experimentally tested. The sensor structure and the equal-arm Mach-Zehnder fiber interferometer were designed, and the experimental results showed that the magnetic field resolutions of the optical fiber magnetic field sensors with sensing length of 0.25 m and 1 m were 15.4 nT/√Hz @ 10 Hz and 4.2 nT/√Hz @ 10 Hz, respectively. This confirmed the sensitivity multiplication relationship between the two sensors and the feasibility of improving the magnetic field resolution to the pT level by increasing the sensing length.

摘要

基于磁致伸缩效应的光纤干涉磁场传感器具有灵敏度高、对恶劣环境适应性强、传输距离远等优点，在深井、海洋等极端环境中具有广阔的应用前景。本文提出并实验验证了两种基于铁基非晶纳米晶 ribbon 的光纤磁场传感器和一种无源 3×3 耦合器解调系统。设计了传感器结构和等臂马赫-曾德尔光纤干涉仪，实验结果表明，传感长度为 0.25 m 和 1 m 的光纤磁场传感器的磁场分辨率分别为 15.4 nT/√Hz@10 Hz 和 4.2 nT/√Hz@10 Hz，验证了两个传感器的灵敏度倍增关系，以及通过增加传感长度将磁场分辨率提高到皮特斯拉（pT）级别的可行性。