Abstract

A novel and practical magnetic field sensor based on optical fiber optics is proposed in our work. We first demonstrate magnetic sensing with the structure that single-mode optical fibers are fused with capillaries in parallel in an experiment. We clearly show the aggregation and arrangement variation with the magnetic field of magnetic nanoparticles in capillaries. Based on the tunable effective refractive index of optical modes in a waveguide structure of a sensor, the optical properties and sensing mechanism in the sensing structure were simulated and further analyzed. We achieved the detection of a space magnetic field, including intensity and its direction. We obtained that the sensitivity of a sensor is 112 pm/mT, presenting good performance in the same kind of optical fiber magnetic field sensor.

© 2019 Optical Society of America

All-fiber-optic vector magnetic field sensor based on side-polished fiber and magnetic fluid

Yongxi Li, Shengli Pu, Yongliang Zhao, Rui Zhang, Zixuan Jia, Jilei Yao, Zijian Hao, Zhongxue Han, Dihui Li, and Xinjie Li
Opt. Express 27(24) 35182-35188 (2019)

Magnetic field sensing based on capillary filled with magnetic fluids

Hongzhu Ji, Shengli Pu, Xiang Wang, Guojun Yu, Ning Wang, and Haotian Wang
Appl. Opt. 51(27) 6528-6538 (2012)

Vector magnetic field sensor based on orthogonal off-set spliced optical fiber cladded with magnetic fluid

Zijian Hao, Shengli Pu, Yongxi Li, and Dihui Li
J. Opt. Soc. Am. B 38(9) 2494-2501 (2021)

Mach–Zehnder interferometric magnetic field sensor based on a photonic crystal fiber and magnetic fluid

Xiang Zi Ding, Hang-Zhou Yang, Xue-Guang Qiao, Pan Zhang, Oin Tian, Qiang Zhou Rong, Nurul Asha Mohd Nazal, Kok-Sing Lim, and Harith Ahmad
Appl. Opt. 57(9) 2050-2056 (2018)

Vector magnetic field sensor based on U-bent single-mode fiber and magnetic fluid

Yongxi Li, Shengli Pu, Zijian Hao, Shaokang Yan, Yuxiu Zhang, and Mahieddine Lahoubi
Opt. Express 29(4) 5236-5246 (2021)