Materials, Photonic Devices, and Sensors

Optical fiber magnetic field sensor based on cascaded down-taper and spherical structure

[+] Author Affiliations
Zhengrong Tong, Panpan Luan, Ye Cao

Tianjin University of Technology, School of Computer and Communication Engineering, Tianjin Key Laboratory of Film Electronic and Communication Devices, No. 391 Binshui West Road, Xiqing District, Tianjin 300384, China

Weihua Zhang

Tianjin University of Technology, School of Electronics Information Engineering, Tianjin Key Laboratory of Film Electronic and Communication Devices, No. 391 Binshui West Road, Xiqing District, Tianjin 300384, China

Lan Li

Tianjin University of Technology, Institute of Material Physics, No. 391 Binshui West Road, Xiqing District, Tianjin 300384, China

Opt. Eng. 54(8), 087106 (Aug 13, 2015). doi:10.1117/1.OE.54.8.087106
History: Received June 17, 2015; Accepted July 30, 2015
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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 0.195nm/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 0.106dB/mT.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Zhengrong Tong ; Panpan Luan ; Ye Cao ; Weihua Zhang and Lan Li
"Optical fiber magnetic field sensor based on cascaded down-taper and spherical structure", Opt. Eng. 54(8), 087106 (Aug 13, 2015). ; http://dx.doi.org/10.1117/1.OE.54.8.087106


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