Optimization of a High Screening Performance and Low Noise Magnetically Shielded Cylinder for SERF Atomic Magnetometer

Xie, Xiaoxuan; Zhou, Xiangyang; Zhao, Fengwen; Wang, Weiqian; Sun, Jinji

doi:10.1109/jsen.2022.3208424

Cited by 14 publications

(3 citation statements)

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“…The outermost aluminium casing is capable of shielding the external high-frequency electromagnetic field while protecting the inner metal layers from pressure. 23 The innermost layer had a diameter of 800 mm and a length of 1600 mm. The working area was 600–800 mm from the bottom of the barrel and the maximum residual magnetism inside the barrel was less than 10 nT.…”

Section: Methodsmentioning

confidence: 99%

Co-registration of OPM-MCG signals with CT using optical scanning

Yang,

Wang,

Liu

et al. 2023

iScience

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Section: Methodsmentioning

confidence: 99%

Co-registration of OPM-MCG signals with CT using optical scanning

Yang,

Wang,

Liu

et al. 2023

iScience

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“…To achieve high-performance MSC, Zhang et al [18] optimized the axial factor of multi-layer shielded cylinder to enhance their shielding performance in atomic magnetometers. Xie et al [19] improved the structure of a four-layer magnetic shielded cylinder using a multi-stage inertia-weighted particle swarm optimization algorithm, taking segmented magnetic noise and material volume as constraints and axial shielding factor as the objective. Upon comparing the optimized structure with the original design, the axial and radial shielding factors of the optimized MSC increased by approximately 17.95 and 15.3 times, respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimized design of small sized low noise magnetic shielding cylinder

Sun,

Zhao,

Zhang

et al. 2024

Phys. Scr.

Self Cite

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Magnetic shielded cylinder (MSC) is crucial in various applications, especially in the realm of medical weak magnetic signal measurement. However, designing a small volume, low noise MSC is a multi-objective optimization problem, with the objectives conflict with each other. To address the complexity arising from numerous variables in the optimal design of MSC with a small volume and low-noise, this paper proposes an optimal design method based on non-dominated sorting genetic algorithm II (NSGA-II) to realize the optimal design of MSC with a high shielding factor, small volume and low-noise. Firstly, an analytical model for the shielding factor of the MSC is established, and a multi-objective optimization model is given. Then, the NSGA-II algorithm is employed to obtain a series of Pareto frontier optimal solutions. Finally, the efficacy of this method is evaluated through simulation and experimentation. The results reveal that the radial and axial shielding factors of the optimized MSC achieve maximum values of 8.6×107 and 9.5×106 respectively. Meanwhile, the average axial noise and radial noise of the MSC between 1 and 100 Hz are 22 fT/Hz1/2 and 20 fT/Hz1/2 respectively. Practice has proven that this method can be used to optimize the design of small-volume, low-noise magnetic shields to improve the performance of magnetic shields.

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“…Yang et al proposed utilizing finite element analysis for structural optimization design of low-frequency MSR with dimensions of 3.3 m × 3.3 m × 3.3 m, which achieved residual fields as low as 28 nT [21]. Xie et al proposed a multi-level inertia weight particle swarm optimization algorithm for optimizing the design of a four-layer MSC used for the spin-exchange relaxation-free (SERF) magnetometers, which ensured residual filed within 2nT inside the internal space with a diameter of 150 mm and a length of 850 mm [22]. While zero magnetic devices can provide near-zero magnetic field environments, they cannot provide the necessary conditions for cell culture, such as constant temperature, humidity, sterility, and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of high-performance small magnetic shielding box

Zhao,

Liu,

Zhang

et al. 2024

Phys. Scr.

Self Cite

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Investigating the state of cells in zero magnetic or near-zero magnetic environments is an important scientific issue. However, standard cell culture incubators can only provide general conditions such as constant temperature, constant humidity, sterility, and carbon dioxide, and cannot provide zero magnetic or near-zero magnetic environments for cell culture. To address this issue, an optimization method was proposed in this paper based on the combination of the particle swarm optimization algorithm (PSO) and the finite element method (FEM), achieving the optimization design of a magnetic shielding box (MSB) with a small volume, high shielding factor, and low residual field. Firstly, the high-permeability layer and high-conductivity layer were optimized respectively using the PSO and FEM. Then, the effectiveness of this method was analyzed through experiments. The experimental results show that the shielding factors in three directions at the center point of the optimized MSB are 786.8 (east-west), 2182.7 (north-south), and 1389.4 (vertical) respectively at 0.01 Hz. Meanwhile, the maximum residual field in the cubic region with a side length of 10 cm inside the MSB is 11.9 nT. Finally, the MSB designed by this method was placed in a standard cell culture incubator to cultivate cells in a zero-magnetic or near-zero magnetic environment. Then the Cell Counting Kit-8 (CCK8) experiments to evaluate the cytotoxicity of chemotherapy drugs on tumor cells in a weak magnetic environment (WMF). The results show that the lethality of paclitaxel (PTX) to Epidermal carcinoma cell (A431) increases by 25.96 times and the lethality of gemcitabine (GE) to Lung carcinoma cell (NCI-H460) increases by 24.23 times in a WMF. At the same time, the maximum proliferation inhibition rate of 5-fluorouracil (5-FU) on NCI-H460 cells in a WMF environment increased by 15.69%. That is, WMF could significantly improve the therapeutic effect of chemotherapy drugs on tumor cells.

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Optimization of a High Screening Performance and Low Noise Magnetically Shielded Cylinder for SERF Atomic Magnetometer

Cited by 14 publications

References 0 publications

Co-registration of OPM-MCG signals with CT using optical scanning

Co-registration of OPM-MCG signals with CT using optical scanning

Optimized design of small sized low noise magnetic shielding cylinder

Design and experiment of high-performance small magnetic shielding box

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