U字形磁性体を用いた磁気遮蔽

抄録

A new static magnetic shielding equipment consisted of several U shaped soft ferromagnetic bodies is proposed. This magnetic shielding equipment shows a remarkable shielding effect and the shielding factor can be adjusted optionally. Magnetization characteristics of the U shaped soft ferromagnetic body in a uniform magnetic field are analized by a numerical method assuming that magnetization of a short segment of the U shaped soft ferromagnetic body is uniform over the short segment. The shielding effectiveness is calculated by superposing a demagnetizing field due to magnetization of the U shaped ferromagnetic body on an external field. The calculated results are in very good agreement with the measured results.