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首页> 外文期刊>IEEE Transactions on Magnetics >Pulse distortion due to eddy currents induced in a multiply excited cylindrical shell of finite length and thickness
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Pulse distortion due to eddy currents induced in a multiply excited cylindrical shell of finite length and thickness

机译：在有限长度和厚度的多重激发圆柱壳中由于涡流感应的脉冲畸变

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摘要

The electromagnetic field due to pulse excitation of two crossed pairs of coils surrounded by a cylindrical conducting shell is determined by accounting for the eddy-current effect. Each coil is modeled as a pair of straight, parallel wires of infinite length; the surrounding conducting shell is a cylindrical tube of finite length and thickness. The problem is formulated in the frequency domain, and the resulting expressions are used to calculate the transient magnetic flux density which originates from the quadruple coil and the eddy currents induced within the metallic shell. The part due to the eddy currents represents an unwanted distortion, which is investigated through a numerical example. The analytical and numerical results are complemented by a brief discussion on compensation techniques and potential applications in magnetic resonance imaging.
机译：通过考虑涡流效应来确定由于被圆柱状导电壳包围的两对交叉线圈对的脉冲激励而产生的电磁场。每个线圈建模为一对无限长的平行直线；周围的导电壳是长度和厚度有限的圆柱形管。该问题在频域中表述，所得的表达式用于计算瞬态磁通密度，该瞬态磁通密度源自四重线圈和金属壳内感应的涡流。由涡电流产生的部分表示不想要的变形，这通过数值示例进行了研究。简要讨论补偿技术及其在磁共振成像中的潜在应用，以补充分析和数值结果。

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