Design of high shielding effectiveness magnetic shield for fiber optic gyroscope

A new type of magnetic shield with annular cavity structure is designed based on the study of the factors affecting the shielding effectiveness for fiber optic gyroscope (FOG). In order to prove the feasibility of using the finite element method (FEM) to research the magnetic shielding effectiveness...

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Bibliographic Details
Published in:Optik (Stuttgart) 2019-12, Vol.198, p.163160, Article 163160
Main Authors: Li, Xuyou, Li, Haoyu, Gu, Yuanxin, Liu, Pan, Zhang, Yue, Guo, Yanda, Meng, Qingwen
Format: Article
Language:English
Subjects:
Fiber optic gyroscope
Finite element method
Magnetic shield
Shielding effectiveness
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Summary:A new type of magnetic shield with annular cavity structure is designed based on the study of the factors affecting the shielding effectiveness for fiber optic gyroscope (FOG). In order to prove the feasibility of using the finite element method (FEM) to research the magnetic shielding effectiveness problem, we design a simulation and experimental comparison verification test for the currently used magnetic shield. The optimized design parameters are obtained by discussing the effects of the number of layers, the layer spacing, the via holes and the gap width on the shielding effectiveness. The shielding effectiveness of the annular cavity structure magnetic shield under radial magnetic field is about 55 dB, which is 20 dB higher than that of the current magnetic shield. The shielding effectiveness under axial magnetic field is about 80 dB which improved by 45 dB. Meanwhile, this annular cavity structure reduces the weight of the FOG.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2019.163160