Vectorial Magnetic Field Sensing by Magnetic-Fluid-Infiltrated Eccentric Fiber Bragg Grating

被引：11
作者：
Zhang, Junying [1 ]
Jiang, Yuanyuan [1 ]
Chen, Haibin [1 ]
Zhang, Xiongxing [1 ]
Guo, Zilong [1 ]
Wang, Wei [1 ]
机构：
[1] Xian Technol Univ, Sch Optoelect Engn, Xian 710021, Peoples R China
来源：
IEEE SENSORS JOURNAL | 2022年 / 22卷 / 21期
关键词：
Cladding mode; eccentric fiber Bragg grating (EFBG); fiber-optic sensor; magnetic field; magnetic fluid (MF); FABRY-PEROT SENSOR; THIN-CORE FIBER; REFRACTIVE-INDEX;
D O I：
10.1109/JSEN.2022.3207208
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A novel miniature magnetic-fluid (MF)-infiltrated eccentric fiber Bragg grating (EFBG) vectorial magnetic field sensor was proposed and experimentally demonstrated. An EFBG with a length of 10 mm and an eccentric distance of 2 mu m was written in a standard single-mode fiber by a point-to-point femtosecond laser (FSL) writing process, which was then sealed in an MF-infiltrated glass capillary (GC) to form the magnetic-field-sensitive structure. Through the refractive index and absorption modulation of the MF under the influence of external magnetic fields, the transmission intensities at the resonant wavelengths of cladding modes are accordingly changed. Transmission at these resonant wavelengths can be used as the magnetic field sensing quantity. Experiments show that the sensor can sensitively respond to both strength and direction of the magnetic field. A sensitivity of about 0.042 dB/Oe in a magnetic field strength range of 0-120 Oe was found.
引用
收藏
页码：20508 / 20515
页数：8
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