Intensity-interrogated magnetic field sensor with resolved temperature cross sensitivity based on down-fusion taper and S-taper integrated with magnetic fluids

Wenwen Wu; Ye Cao; Hao Zhang; Bo Liu; Xu Zhang; Shaoxiang Duan; Ting Liu; Yange Liu

doi:10.1117/1.OE.58.7.077102

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9 July 2019 Intensity-interrogated magnetic field sensor with resolved temperature cross sensitivity based on down-fusion taper and S-taper integrated with magnetic fluids

Wenwen Wu, Ye Cao, Hao Zhang, Bo Liu, Xu Zhang, Shaoxiang Duan, Ting Liu, Yange Liu

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Optical Engineering, 58(7), 077102 (2019). https://doi.org/10.1117/1.OE.58.7.077102

Abstract

An intensity-interrogated fiber-optic magnetic field sensor functionalized with magnetic fluids is proposed and experimentally demonstrated by encapsulating an S-taper concatenated with down-fusion taper in a silica capillary. The down-fusion taper serves as a higher order mode exciter, whereas the S-taper is employed to couple the cladding modes back into the fiber core, and so an interferometric spectrum could be acquired for sensing interrogation. Spectral characteristics of the proposed sensor dependent on magnetic field intensity and environmental temperature are investigated in detail. Experiment results show that the maximum magnetic field sensitivity reaches −0.02336 dB / Oe within a specific range of 25 to 200 Oe, and the temperature sensitivity reaches 0.07116 dB / ° C within a temperature range of 26°C to 46°C. By exploiting the distinction between magnetic field intensity and temperature sensitivities of peak 1 and dip 1 that are selected for intensity interrogation, temperature cross-sensitivity issue can be resolved.

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Wenwen Wu, Ye Cao, Hao Zhang, Bo Liu, Xu Zhang, Shaoxiang Duan, Ting Liu, and Yange Liu "Intensity-interrogated magnetic field sensor with resolved temperature cross sensitivity based on down-fusion taper and S-taper integrated with magnetic fluids," Optical Engineering 58(7), 077102 (9 July 2019). https://doi.org/10.1117/1.OE.58.7.077102

Received: 26 April 2019; Accepted: 14 June 2019; Published: 9 July 2019

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