电磁波法探测地下异常体的数值模型和实验模型

NUMERICAL AND EXPERIMENTAL MODELS FOR EXPLO-RATION OF UNDERGROUND INHOMOGENEITIES BY MEANS OF ELECTROMAGNETIC WAVES

本文研究均匀有耗媒质全空间及半空间中三维异常体散射的数值模型和实验模型。用矩量法解体积分方程,导出自小块积分的简单准确的计算公式,说明非自小块积分以及索末菲积分的简化计算方法。给出两个利用金属镜象板的水池测试装置,说明与测试方法有关的若干主要问题。计算结果与测量结果基本吻合。

A numerical modeling and two experimental models are developed for investigating the electromagnetic scattering from a rectangular inhomogeneity in a homogeneous lossy medium or in the presence of a horizontal interface of two media. The volume integral equation is solved by the method of moments. An accurate and simple formulation for the singular self-cell integral is derived. The simplified procedures for calculating non-self-cell integrals and Sommerfeld integrals are given. Two water-tank experimental facilities using a metal image plate are described. Several important problems concerning the experiments are discussed. There is good agreement between the numerical and experimental results.