A novel fiber Sagnac magnetic field sensor based on magnetic fluid

被引：0
|
作者：
Zu P. [1 ,2 ]
Xiang W. [1 ,2 ]
Bai Y. [1 ,2 ]
Jin Y. [3 ]
机构：
[1] College of Precision Instrument and Opto-Electronics Engineering, Tianjin University
[2] Key Laboratory of Opto-Electronics Information and Technical Science, Ministry of Education, Tianjin University
[3] School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
来源：
Guangxue Xuebao/Acta Optica Sinica | 2011年 / 31卷 / 08期
关键词：
Birefringence; Fiber optics; Magnetic fluid; Magneto-optic effect; Optical fiber magnetic field sensor; Sagnac interferometer;
D O I：
10.3788/AOS201131.0806005
中图分类号：
学科分类号：
摘要：
An optical fiber Sagnac magnetic field sensor based on magnetic fluid is proposed. The magnetic fluid exhibits magneto-optic birefringence under external magnetic field, in which the nanoparticles form chains along the magnetic field and cause the anisotropy. The interference spectrum of the sensor shifts with the external magnetic field due to the magnetic fluid film inserted in the Sagnac loop together with a section of polarization maintaining fiber. The output spectrum shifts with the variation of magnetic field strength when the plane of the magnetic fluid is perpendicular to the direction of the light and parallel to the direction of the external magnetic field. The achieved sensitivity and resolution of the sensor, which are related to the thickness of the magnetic film, are 16.7 pm/Oe (1 Oe≈79.578 A/m) and 0.60 Oe for 60 μm thickness, respectively. When the plane of the magnetic fluid is perpendicular to the direction of the magnetic field, the output spectrum does not shift with the variation of the magnetic field strength.
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