In order to study the characteristics of the early signal with TEM,both self-induction formula of single coil and multiturn coils are given;

• 为研究瞬变电磁早期信号的特性,讨论多匝线圈与单匝线圈的自感系数的关系,得出线圈自感信号振幅的理论表达式,并推导出单匝和多匝回线的电感公式。