Design, construction, and performance of a large-volume magnetic shield

Väinö Kelhä; Jussi M. Pukki; Risto S. Peltonen; Auvo J. Penttinen; Risto J. Ilmoniemi; Jarmo J. Heino

doi:10.1109/TMAG.1982.1061780

Design, construction, and performance of a large-volume magnetic shield

Väinö Kelhä, Jussi M. Pukki, Risto S. Peltonen, Auvo J. Penttinen, Risto J. Ilmoniemi, Jarmo J. Heino

VTT Technical Research Centre of Finland

Helsinki University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

182 Citations (Scopus)

Abstract

A cubic magnetically shielded room has been constructed. The room consists of three concentric cubic shields, and the side length of the smallest shell is 2A5 m. It utilizes ferromagnetic and eddy current shielding, active noise compensation, and shaking to achieve a shielding factor of about 400 000 between 1 Hz and 100 Hz. At lower frequencies, the shielding drops gradually and is about 16 000 for a 0.1-Hz disturbance. The residual magnetic induction in the room is less than 5 nT, and the magnetic noise above 0.5 Hz is lower than that of the superconducting quantum interference device (SQUID) magnetometer used in the measurements. When the room was completed, its performance in shielding was better than that of any other room made before.

Original language	English
Pages (from-to)	260-270
Journal	IEEE Transactions on Magnetics
Volume	18
Issue number	1
DOIs	https://doi.org/10.1109/TMAG.1982.1061780
Publication status	Published - 1982
MoE publication type	A1 Journal article-refereed

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title = "Design, construction, and performance of a large-volume magnetic shield",

abstract = "A cubic magnetically shielded room has been constructed. The room consists of three concentric cubic shields, and the side length of the smallest shell is 2A5 m. It utilizes ferromagnetic and eddy current shielding, active noise compensation, and shaking to achieve a shielding factor of about 400 000 between 1 Hz and 100 Hz. At lower frequencies, the shielding drops gradually and is about 16 000 for a 0.1-Hz disturbance. The residual magnetic induction in the room is less than 5 nT, and the magnetic noise above 0.5 Hz is lower than that of the superconducting quantum interference device (SQUID) magnetometer used in the measurements. When the room was completed, its performance in shielding was better than that of any other room made before.",

author = "V{\"a}in{\"o} Kelh{\"a} and Pukki, {Jussi M.} and Peltonen, {Risto S.} and Penttinen, {Auvo J.} and Ilmoniemi, {Risto J.} and Heino, {Jarmo J.}",

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T1 - Design, construction, and performance of a large-volume magnetic shield

AU - Kelhä, Väinö

AU - Pukki, Jussi M.

AU - Peltonen, Risto S.

AU - Penttinen, Auvo J.

AU - Ilmoniemi, Risto J.

AU - Heino, Jarmo J.

PY - 1982

Y1 - 1982

N2 - A cubic magnetically shielded room has been constructed. The room consists of three concentric cubic shields, and the side length of the smallest shell is 2A5 m. It utilizes ferromagnetic and eddy current shielding, active noise compensation, and shaking to achieve a shielding factor of about 400 000 between 1 Hz and 100 Hz. At lower frequencies, the shielding drops gradually and is about 16 000 for a 0.1-Hz disturbance. The residual magnetic induction in the room is less than 5 nT, and the magnetic noise above 0.5 Hz is lower than that of the superconducting quantum interference device (SQUID) magnetometer used in the measurements. When the room was completed, its performance in shielding was better than that of any other room made before.

AB - A cubic magnetically shielded room has been constructed. The room consists of three concentric cubic shields, and the side length of the smallest shell is 2A5 m. It utilizes ferromagnetic and eddy current shielding, active noise compensation, and shaking to achieve a shielding factor of about 400 000 between 1 Hz and 100 Hz. At lower frequencies, the shielding drops gradually and is about 16 000 for a 0.1-Hz disturbance. The residual magnetic induction in the room is less than 5 nT, and the magnetic noise above 0.5 Hz is lower than that of the superconducting quantum interference device (SQUID) magnetometer used in the measurements. When the room was completed, its performance in shielding was better than that of any other room made before.

U2 - 10.1109/TMAG.1982.1061780

DO - 10.1109/TMAG.1982.1061780

M3 - Article

SN - 0018-9464

VL - 18

SP - 260

EP - 270

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 1

ER -

Design, construction, and performance of a large-volume magnetic shield

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