分层媒质中极低频水平电偶极子在绝缘介质半空间中产生的电磁场

Electromagnetic Field in Insulating Halfspace Produced by an Extremely Low Frequency Time Harmonic Horizontal Electric Dipole Embedded in Multi Conducting Medium Layers

推导出分层导电媒质中顶层极低频时谐电偶极子在绝缘介质半空间中产生的电磁场分布的索末非积分表达式;以海床-海水-空气三层模型为例,水平交流电偶极子位于海水中,采用汉克尔变换及快速傅里叶变换,数值计算了空气半空间中的电磁场分布.结果表明极低频时谐电偶极子在空气中产生的电磁场有可测量的量级.

The Sommerfield integral expression has been derived for the electromagnetic field in insulating half-space produced by an extremely low frequency, time-harmonic horizontal electric dipole embedded in the first layer with multi conducting medium layers. The distribution of electromagnetic field in air produced by a horizontal Ac electric dipole embedded in seawater has been numerically calculated by applying fast Hankel transform and fast Fourier transform with seabed-seawater air three layers model. The results show that the electromagnetic field in air has measurable magnitude ,and thus provides a new possible way to detect the object in conducting medium.