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SHIELDING THE MAGNETIC FIELD
FOR EXCLUSION OF THE EARTH MAGNETIC FIELD
Designing a vessel with quasi 0 magnetic field
Optimization the design of the vessel
Case shown : cylindrical vessel of 200 mm ( 8 inches) diameter
- material Mu metal annealed as sheet of various thickness
- analysis of the attenuation factor with thickness of the sheet and the vessel height
1- schematic of the shielding vessel
2- Variation of the Attenuation factor with the thickness of the Mu metal sheet
MAGNETICA is able to calculate very thin sheet, (down to 10-6 mm) magnetic structure
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bleu : vessel closed
orange : sleeve with bottom
red : sleeve alone |
3- Variation of the Attenuation factor with the length of the vessel
(shielding made with a Mu metal sheet of 0.1 mm thickness
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bleu : vessel closed
orange : sleeve with bottom
red : sleeve alone |
- Vessel design for earth field shielding
diameter : 200 mm (8 inches)
high : 200 mm (8 inches)
shielding material : Mu metal annealed, sheet of 0.1 mm
earth magnetic field 459 milligauss (modulus)
- single wall design
residual field 10.7 milligauss
attenuation factor : 97.6 % or 32.6 DB
- double wall design
separation distance between the 2 walls : 10 mm (0.4 inches)
residual field 1.9 milligauss
attenuation factor : 99.6 % or 47.5 DB
4 - Field Map lines of the double wall design
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