多区域柱面分层介质中的电磁散射—电磁波测井分析

本文讨论了径向柱面分层介质中全波分析的解析模式和数值模式方法.前者适用于任意激励形式下的场分析;后者在轴对称激励时,通过引入反射矩阵和透射矩阵的概念,可求解二维完全非均匀介质中的场.基于数值模式匹配理论,编制了适用于电磁波测井的计算机分析程序.通过实例计算,获得了与二维有限元方法完全一致的结果。而计算时间仅后者的1％.

Electromagnetic Scattering in Multiregion Cylindrically Layered Media-Electromagnetic Wave Logging Analysis

In this paper the analytic mode method and numerical mode method for full wave analysis of electromagnetic scattering in cylindrically layered media are discussed. The former is applicable to field analysis under any kind of excitation; and the latter can be used to solve the field in 2-D inhomogenious media efficiently by using the concepts of reflection matrix and transmisioti matrix. Based on the numerical mode matching theory the computer aid analysis code has been given. The computation results are obtained in excellent agreement with the data from two-dimension finite element method (FEM) and the computer time is only one percent of the time of FEM.