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Optical Engineering

Development of thin-slice fiber Bragg grating-giant magnetostrictive material sensors used for measuring magnetic field of magnetic bearings
Author(s): Guoping Ding; Huaqiang Wang; Jiayi Liu; Bin Gao; Biyun Zhang
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Paper Abstract

The magnetic field is a physical medium used to realize the levitation and motion control of magnetic bearings. It is necessary to conduct the air-gap flux density measurement so as to validate theoretical analyses and provide instructions for practical design. A thin-slice fiber Bragg grating-giant magnetostrictive material (FBG-GMM) sensor, in which the FBG was stuck perpendicular to the principal magnetostriction orientation of a thin GMM slice, was proposed to measure magnetic-flux density in the small air gap. The configuration of FBG-GMM sensor was the same with that of a sensor of 1.5  mm×14  mm×7  mm TbDyFe slice stuck with a 1300 nm-wavelength FBG on the side of the slice. The FBG-GMM magnetic field sensor was tested on an U-shape electromagnet test setup under static conditions. The sensor had a linear region of 0.121 to 0.261 T with the sensitivity of 1089.056  pm/T. The FBG-GMM magnetic field sensor was introduced to measure the air-gap flux density of radial magnetic bearings. Measurement of static flux density was conducted with 2 FBG-GMM sensors compensated with a temperature FBG; and the measured data showed that the FBG-GMM sensor had feasible linear region and sensitivity to measure the air-gap flux density of magnetic bearings.

Paper Details

Date Published: 7 October 2015
PDF: 7 pages
Opt. Eng. 54(10) 107102 doi: 10.1117/1.OE.54.10.107102
Published in: Optical Engineering Volume 54, Issue 10
Show Author Affiliations
Guoping Ding, Wuhan Univ. of Technology (China)
Huaqiang Wang, Wuhan Univ. of Technology (China)
Jiayi Liu, Wuhan Univ. of Technology (China)
Bin Gao, Wuhan Univ. of Technology (China)
Biyun Zhang, Wuhan Univ. of Technology (China)

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