A high-performance multilayer cylindrical magnetic shielding with a varying layer spacing for NMR sensors

电磁屏蔽 材料科学 护盾 护盾 磁场 漏磁 磁通量 核磁共振 横截面 复合材料 物理 结构工程 岩石学 量子力学 工程类 地质学
作者
Shaofeng Jie,Jianli Li,Zhanchao Liu,Yunkai Mao
出处
期刊:Measurement Science and Technology [IOP Publishing]
卷期号:34 (9): 095124-095124 被引量:2
标识
DOI:10.1088/1361-6501/acde99
摘要

Abstract A stable inner working environment is essential for nuclear magnetic resonance sensors, which requires the absence of remnant magnetic fields and fluctuations caused by the surrounding magnetic fields. In this study, we utilized analytical formulations to derive transverse and longitudinal magnetic shielding factors for multilayer cylindrical magnetic shielding. Subsequently, we proposed a novel method for designing and improving the shielding factor by optimizing the spacing of every pair of adjacent layers within a limited volume. The final design result of the multilayer cylindrical magnetic shielding features optimally designed varying layer spacings, which are associated with a specific length and diameter. After optimization, the transverse shielding factor increased by 5.53%, 8.99%, and 13.51% for the three-, four-, and five-layer shields, respectively, compared to traditional magnetic shielding. The opening in the axial center of the magnetic shielding barrel may cause leakage of the magnetic flux and inhomogeneous remnant magnetic induction. We introduced a stovepipe to the end cap of the axial shield based on the finite element method, resulting in an improvement in the homogeneity of remnant magnetic induction. This modification widened the axial uniform region of the innermost shielding layer by approximately 9 cm within 52.5 cm in our simulation. To implement our proposed optimization method, we established and manufactured a four-layer cylindrical magnetic shielding with stovepipes and varying layer spacings. Moreover, the results indicate that this optimal method works for other applications in which multilayer magnetic shielding is required.
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