Electromagnetic Simulation of Low-Frequency Magnetic Shielding of a Welded Steel Plate

Matsuzawa, Shin-ichiro; Kojima, Takashi; Mizuno, Kiyonori; Kagawa, Kenichi; Wakamatsu, Atsuyuki

doi:10.1109/temc.2021.3087187

Cited by 17 publications

(7 citation statements)

References 21 publications

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“…The relative permeability of steel is fixed to 200. The mass density of the trilayer composite, the Al, and steel layers are 2.55, 2.71, and 7.85 g/cm 3 , respectively. Then, the thickness of Al and steel corresponding to an equal mass is 1.974 mm and 652 µm, respectively.…”

Section: Iso-mass Studymentioning

confidence: 99%

“…Conductive metals are known to shield high-frequency electromagnetic fields [1,2] thanks to eddy currents. Magnetic metals are able to shield low-frequency electromagnetic fields [3][4][5] thanks to their capacity to channel magnetic flux. Multilayered shields or biphasic composite, combining both conductive and magnetic metals, give interesting results in different frequency ranges [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Design of a Lightweight Multilayered Composite for DC to 20 GHz Electromagnetic Shielding

et al. 2021

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The work aims to design a trilayer composite dedicated to electromagnetic shielding over a large frequency range, from 1 Hz to 20 GHz. Analytical and numerical models are used to determine the shielding effectiveness (SE) of this composite in the case of a planar shield. The shield is constituted of a support layer, a magnetic layer, and a conductive layer. Two possible designs are considered. To simplify the numerical calculation, a homogenization method and the Artificial Material Single Layer (AMSL) method are used. The proposed composite shows a good shielding capacity over the whole studied frequency range, with shielding effectiveness higher than 17 dB and 75 dB, respectively, in the near-field (1 Hz–1 MHz) and far-field (1 MHz–20 GHz). Both homogenization and AMSL methods show good suitability in near-field and allow one to greatly reduce the calculation time.

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Section: Iso-mass Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Lightweight Multilayered Composite for DC to 20 GHz Electromagnetic Shielding

et al. 2021

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“…Large-scale magnetic shielding devices, used high permeable magnetic materials and high conductivity materials, such as permalloy and aluminum, to prevent the external magnetic field from entering its interior, based on the flux shunt effect [ 1 , 2 , 3 ] and eddy current effect [ 4 , 5 ], are used to provide extremely weak magnetic field environment. In the weak magnetic environment, many scholars have carried out frontier work, such as the measurement of biological signals such as magnetocardiography and magnetoencephalography [ 6 , 7 , 8 ], the measurement of geophysical research samples [ 9 ], the measurement of electric dipole moments [ 10 ], research on high-precision magnetic measuring instruments, such as serf atomic gyroscopes and magnetometers [ 11 , 12 ] and so on.…”

Section: Introductionmentioning

confidence: 99%

Testing and Analysis Method of Low Remanence Materials for Magnetic Shielding Device

et al. 2023

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Magnetic shielding devices with a grid structure of multiple layers of highly magnetically permeable materials (such as permalloy) can achieve remanent magnetic fields at the nanotesla (nT) level or even lower. The remanence of the material inside the magnetic shield, such as the building materials used in the support structure, can cause serious damage to the internal remanence of the magnetic shield. Therefore, it is of great significance to detect the remanence of the materials used inside the magnetic shielding device. The existing test methods do not limit the test environment, the test process is vulnerable to additional magnetic field interference and did not consider the real results of the material in the weak magnetic environment. In this paper, a novel method of measuring the remanence of materials in a magnetic shielding cylinder is proposed, which prevents the interference of the earth’s magnetic field and reduces the measurement error. This method is used to test concrete components, composite materials and metal materials commonly applicated in magnetic shielding devices and determine the materials that can be used for magnetic shielding devices with 1 nT, 10 nT and 100 nT as residual magnetic field targets.

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“…The magnetically shielded room (MSR) used high permeable magnetic materials and high conductivity materials, such as permalloy and aluminum, to prevent the external magnetic field from entering its interior. Based on the principle of flux shunt [ 1 , 2 , 3 ] and eddy current loss [ 4 , 5 ], it can be used to provide an extremely weak magnetic field (EWMF) environment. In this environment, many frontier research studies for different kinds of fields can be carried out: for example, the measurement of weak signals such as magnetic heart and brain [ 6 , 7 , 8 ], the measurement of geophysical research samples [ 9 ], the measurement of electric dipole moments [ 10 ], the study of high-precision magnetic measuring instruments [ 11 , 12 ] and so on.…”

Section: Introductionmentioning

confidence: 99%

A Method to Measure Permeability of Permalloy in Extremely Weak Magnetic Field Based on Rayleigh Model

Sun

Zhang

et al. 2022

Materials

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In order to solve the problem that the relative permeability of the permalloy is missing and difficult to measure accurately in an extremely weak magnetic field (EWMF, <1 nT), a method to measure the permeability in EWMF based on the Rayleigh model is proposed in this paper. In this method, the Rayleigh model for the magnetic material was first introduced. Then, the test system for measuring the permeability of permalloy for the standard ring specimen was set up. Based on the test data and the Rayleigh model, the functional expression applied to obtain the permeability in EWMF is achieved. Finally, the feasibility and accuracy of the method are verified by the permeability measurement of the custom large-size ring specimen in EWMF (<1 nT) and residual field measurement based on the four-layer shielding cylinder. This method can obtain the relative permeability in any EWMF and avoid test errors caused by extremely weak magnetization signals.

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Electromagnetic Simulation of Low-Frequency Magnetic Shielding of a Welded Steel Plate

Cited by 17 publications

References 21 publications

Design of a Lightweight Multilayered Composite for DC to 20 GHz Electromagnetic Shielding

Design of a Lightweight Multilayered Composite for DC to 20 GHz Electromagnetic Shielding

Testing and Analysis Method of Low Remanence Materials for Magnetic Shielding Device

A Method to Measure Permeability of Permalloy in Extremely Weak Magnetic Field Based on Rayleigh Model

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