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THE BEST MAGNETICALLY SCREEN ROOM ON EARTH

For biomagnetic research of the magnetic fields created by the tiny electrical currents in the active nerves of the human heart or brain it is a must to eliminate disturbing external magnetic fields to the highest degree as possible. For this purpose magnetically shielded rooms are necessary.

VAC is a pioneer in shielding applications with a vast application know how. Already in 1980 VAC designed and built for the Physikalisch Technische Bundesanstalt (PTB) a first shielding room with 6 layers of MUMETALL® which exhibits a shielding factor of more than 10 000. The shielding factor defines the ratio of the magnetic field outside to the remaining field inside the shielding room. Since then VAC has accumulated intensive experience in magnetic shielding including FEM design capabilities.

The magnetic super-screening room of PTB Berlin being erected

For new frontiers in biomagnetic research PTB decided to establish in Berlin an improved magnetically shielded room with an extraordinary performance. This shielded room was designed in collaboration between VAC, SIEMENS AG and PTB and completed in the year 2000.

The shielded room with inside dimensions of 2.9 m cube and outside dimensions of 6.0 m cube consists of 7 soft magnetic layers of MUMETALL and an electrically shielding layer of Aluminum.

The layers of MUMETALL (soft magnetic FeNi 80% alloy) have been processed to yield the highest magnetic permeability possible. In addition to this passive shielding a system of electric coils serving as active shielding was installed.

 

The layers of MUMETALL (soft magnetic FeNi 80% alloy) have been processed to yield the highest magnetic permeability possible. In addition to this passive shielding a system of electric coils serving as active shielding was installed.

The measurements performed after completion of the magnetically shielded room exhibited shielding factors of 75 000 at 0.01 Hz and more than 1 000 000 at 1 Hz. With additional active shielding a shielding factor of more than 5 000 000 is achieved. All these figures are records in the world rendering the new PTB room the magnetically quietest place on earth.

More information can be found in this publication 

Last update: 03.12.2012

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