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本文论述双频透射电磁波电导率层析成象方法。设｜Ｅ１｜，｜Ｅ２｜为在远场区观测的同一电偶极天线的两个辐射电场强度。如地质介质的电导率连续变化，观测场强的辐射频率ω１，ω２之差较小，则有如下的电导率层析成象方程｜Ｅ１｜－｜Ｅ２｜＝２０ｌｏｇ（ω１／ω２）＋２０ｌｏｇ（ｅ）μ／２（ω２－ω１）∫σ～（ｒ）ｄｒ式中σ＾＝σ，σ为介质的电导率。双频透射电磁波电导率层析成象方法克服了长期困扰电磁波吸收层析成象的初始辐射场强计算问题，应用实例表明它可获得更精确的层析图。
This article discusses dual-frequency transmission electromagnetic conductivity tomography methods. Let | E1 |, | E2 | be the two radiated electric field intensities of the same dipole antenna observed in the far-field region. If the conductivity of the geological medium changes continuously and the difference between the observed field intensities ω1 and ω2 is small, then the following conductivity tomography equation | E1 | - | E2 | = 20log (ω1 / ω2) + 20log ( e) μ / 2 (ω2-ω1) ∫ σ ~ (r) dr Where σ ^ = σ, σ is the conductivity of the medium. The dual-frequency transmission electromagnetic conductivity tomography imaging method overcomes the problem of initial radiation field strength calculation which long plague the electromagnetic wave absorption tomography, and the application example shows that it can obtain a more accurate chromatogram.