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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >A Stable Analytic Model for Tilted-Coil Antennas in a Concentrically Cylindrical Multilayered Anisotropic Medium
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A Stable Analytic Model for Tilted-Coil Antennas in a Concentrically Cylindrical Multilayered Anisotropic Medium

机译：同心圆柱多层各向异性介质中倾斜线圈天线的稳定解析模型

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摘要

A set of compact and stable formulations is presented to calculate the response of logging tools employing tilted-coil antennas in anisotropic concentrically cylindrical multilayered formation. The presented formulations can be used to investigate the effect of mandrel, borehole, and invasion. Our formulations are different from previous ones in three aspects. First, the tool mandrel can be cylindrically multilayered, and electrical parameters of each layer are arbitrary. That is to say, the mandrel is not limited to being perfectly metallic. Second, the formation can be either anisotropic or isotropic. Finally, the propagation of electromagnetic wave in an inhomogeneous cylindrical medium is described by the generalized reflection and transmission coefficients without the numerical overflow issue. Numerical results in comparison with those from other approaches have demonstrated the validity and stability of our new formulations.
机译：提出了一组紧凑而稳定的公式来计算各向异性的同心圆柱多层地层中采用倾斜线圈天线的测井工具的响应。提出的配方可用于研究心轴，井眼和侵入的影响。我们的配方在三个方面与以前的不同。首先，工具心轴可以是圆柱形多层的，并且每一层的电参数是任意的。也就是说，心轴不限于完全是金属的。第二，地层可以是各向异性的或各向同性的。最后，电磁波在不均匀圆柱介质中的传播由广义的反射系数和透射系数来描述，而没有数值溢出问题。与其他方法相比，数值结果证明了我们新配方的有效性和稳定性。

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