Effectiveness of magnetostatic shielding by cylindrical shells

Abstract

Research and calculations results have been demonstrated that the dependence of the efficiency of magnetostatic shielding for shells with different thickness have a maximum whose position shifts with increasing thickness of the shielding cover in the area of higher fields. Positions of the peaks on the curve Э=Э(Н) and μ=μ(Н) do not coincide with each other. It is difficult to interpret in terms of the shunting model. The results can be explained by nonlinear nature of the distribution of the magnetic permeability witnin the thickness of the shields. The analytical calculations of the average permeability of cylindrical shells with varying thickness were carrying out depending on the strength of the external static magnetic field. It is shown that the courses of the experimental Э=Э(Н) and calculated μ₀=μ₀(Н) dependencies correlate with position of maximum.