Analysis of Induced Current Density in Grounded and Ungrounded Prolate Spheroid Models in Concurrent ELF Electric and Magnetic Fields

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  • 極低周波電磁界内の接地および非接地の回転楕円体状生体モデル内部の誘導電流密度解析
  • キョクテイシュウハ デンジカイ ナイ ノ セッチ オヨビ ヒセッチ ノ カイテン ダエンタイジョウ セイタイ モデル ナイブ ノ ユウドウ デンリュウ ミツド カイセキ

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Analyzed in this paper is the induced current density in the homogeneous prolate spheroid model of a biological object exposed to concurrent 60-Hz vertical electric field (1kV/m), and horizontal and vertical magnetic fields (1-5μT) with different phase angle. The analysis has been carried out separately considering the presence of electric and magnetic fields. The current density induced by electric field is calculated using finite element method (FEM). Whereas the current density induced by magnetic fields is calculated with exact solution for prolate spheroid model. Total induced current density is the vector sum of the current density components induced by electric and magnetic fields. It is found that the density of total current is determined by vertical electric field and horizontal magnetic field. The horizontal magnetic field has an important effect on the total induced current density distribution. The distribution of the density of total current varies with the phase difference between vertical electric and horizontal magnetic fields. As the model gets close to the ground, however, the contribution of the horizontal magnetic field to the total induced current density is liable to decrease.

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