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Optical Engineering

Optical fiber magnetic field sensor based on cascaded down-taper and spherical structure
Author(s): Zhengrong Tong; Panpan Luan; Ye Cao; Weihua Zhang; Lan Li
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Paper Abstract

An optical fiber magnetic field sensor using intermodal interferometer coated by magnetic fluid (MF) is proposed. The interferometer consists of down-taper and spherical structure formed on the standard single-mode fiber (SMF) by a fusion splicer. Since the refractive index (RI) of the MF is sensitive to external magnetic field, the interferometer coated by MF can be used for magnetic field sensing. Two interference valleys of the interferometer integrated with ferrofluid under different magnetic field intensities have been experimentally analyzed. The experimental results show that there is a linear relationship between the valley wavelength shift and magnetic field intensity for a range of 0 to 20 mT, and the maximum sensitivity reaches up to −0.195  nm/mT. In the range of 0 to 12 mT, the variation of transmission loss at valley wavelength with a magnetic field has a maximum sensitivity of 0.106  dB/mT.

Paper Details

Date Published: 13 August 2015
PDF: 4 pages
Opt. Eng. 54(8) 087106 doi: 10.1117/1.OE.54.8.087106
Published in: Optical Engineering Volume 54, Issue 8
Show Author Affiliations
Zhengrong Tong, Tianjin Univ. of Technology (China)
Panpan Luan, Tianjin Univ. of Technology (China)
Ye Cao, Tianjin Univ. of Technology (China)
Weihua Zhang, Tianjin Univ. of Technology (China)
Lan Li, Tianjin Univ. of Technology (China)

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