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  Accuracy assessment of simplified computation of active and passive magnetic shielding for optically pumped magnetometers

Petković, B., Ziolkowski, M., Kutschka, H., Toepfer, H., & Haueisen, J. (2022). Accuracy assessment of simplified computation of active and passive magnetic shielding for optically pumped magnetometers. IEEE Transactions on Magnetics, 58(9): 7401204. doi:10.1109/TMAG.2022.3161736.

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 Creators:
Petković, Bojana1, Author
Ziolkowski, Marek2, 3, Author
Kutschka, Hermann2, 4, 5, Author                 
Toepfer, Hannes1, Author
Haueisen, Jens2, Author
Affiliations:
1Department of Advanced Electromagnetics, TU Ilmenau, Germany, ou_persistent22              
2Institute for Biomedical Engineering and Informatics, TU Ilmenau, Germany, ou_persistent22              
3Electrical Engineering Faculty, West Pomeranian University of Technology, Szczecin, Poland, ou_persistent22              
4Methods and Development Group Brain Networks, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205650              
5Department Psychology (Doeller), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2591710              

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Free keywords: Coils; Magnetic field measurement; Finite element analysis; Permeability; Magnetic fields; Magnetic shielding; Image segmentation
 Abstract: A low residual environmental magnetic field is required for the proper operation of most optically pumped magnetometers (OPMs). This is achieved using a combination of passive and active magnetic shielding. Passive magnetic shielding often uses multiple layers of highly permeable materials. A realistic 2-layer magnetically shielded room (MSR) for biomagnetic measurements is numerically studied using the finite element method. A measured B-H characteristic of Mumetal is used, which is linearly extrapolated from the Rayleigh region into the low magnetic field range. This extension of the magnetization curve yields no significant differences compared to using a constant permeability value for the low magnetic field range. Furthermore, we model the MSR with only one shield and apply a simple analytical method of images (MOI). The MOI yields on average a 100-fold reduction in computation time. The relative difference of the magnetic flux density computed with MOI and FEM is smaller than < 1% at the center of a spherical region of interest with a radius of 0.3m desired from the point of magnetoencephalography using OPMs. The achieved accuracy of the method of images makes it suitable for the optimization of active shielding coils.

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Language(s): eng - English
 Dates: 2022-03-23
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1109/TMAG.2022.3161736
 Degree: -

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Title: IEEE Transactions on Magnetics
  Abbreviation : IEEE Trans. Magn.
Source Genre: Journal
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Publ. Info: New York, NY : Published by the Institute of Electrical and Electronics Engineers for the Magnetics Group
Pages: - Volume / Issue: 58 (9) Sequence Number: 7401204 Start / End Page: - Identifier: ISSN: 0018-9464
CoNE: https://pure.mpg.de/cone/journals/resource/954925405681