Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7131674 | Optics and Lasers in Engineering | 2018 | 5 Pages |
Abstract
A fiber-optic Mach-Zehnder interferometer is proposed and experimentally demonstrated for magnetic field measurement. The device comprises an in-line sandwiched structure, i.e., a multi-single-multi mode structure that is sealed in a tube with a magnetic fluid (MF). The diameter of the single mode fiber is tapered down to 4.2â¯Âµm, which effectively improves the coupling and recoupling of the cladding-to-radiation modes and increases the interferometer's sensitivity to the refractive index change in the MF. As a result, the interference spectrum is highly sensitive to a magnetic field ranging from 0.24 to 2.0 mT with a wavelength-referenced magnetic sensitivity of â2.886â¯nm/mT and an intensity-referenced sensitivity of â8.0â¯dB/mT.
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Authors
Hao Chen, Zhihua Shao, Xuan Zhang, Yongxin Hao, Qiangzhou Rong,