磁屏蔽室的快速消磁程序

Fast Degaussing Procedure for a Magnetically Shielded Room.

作者信息

Koss Peter A, Voigt Jens, Rasser Ronja, Schnabel Allard

机构信息

Fraunhofer-Institut für Physikalische Messtechnik (IPM), Georges-Koehler-Allee 301, 79110 Freiburg, Germany.

Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2, 10587 Berlin, Germany.

出版信息

Materials (Basel). 2024 Nov 30;17(23):5877. doi: 10.3390/ma17235877.

DOI:10.3390/ma17235877

PMID:39685313

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11643308/

Abstract

A demagnetization study was conducted on a magnetically shielded room (MSR) at Fraunhofer IPM, designed for applications such as magnetoencephalography (MEG) and material testing. With a composite of two layers of mu-metal and an intermediate aluminum layer, the MSR must provide a residual field under 5 nT for the successful operation of optically pumped magnetometers (OPMs). The degaussing process, employing six individual coils, reached the necessary residual magnetic field within the central 1 m volume in under four minutes. Due to the low-frequency shielding factor of 100, the obtained average residual field is shown to be limited by environmental residual field changes after degaussing and not by the degaussing procedure.

摘要

在弗劳恩霍夫尔光子与微结构技术研究所（Fraunhofer IPM），对一个为脑磁图（MEG）和材料测试等应用设计的磁屏蔽室（MSR）进行了退磁研究。该磁屏蔽室由两层μ金属和中间一层铝组成，为使光泵磁力仪（OPM）成功运行，其必须提供低于5 nT的剩余磁场。采用六个独立线圈的消磁过程在不到四分钟内使中心1立方米体积内达到了所需的剩余磁场。由于低频屏蔽系数为100，结果表明，所获得的平均剩余磁场受消磁后环境剩余磁场变化的限制，而非受消磁过程的限制。