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首页> 外文期刊>NDT & E international >Transient eddy current method for the characterization of magnetic permeability and conductivity
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Transient eddy current method for the characterization of magnetic permeability and conductivity

机译：瞬态涡流法表征磁导率和电导率

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摘要

Recent analytical solutions, that correctly describe transient eddy current signals in voltage-controlled driver-pickup circuits, are applied for the case of a coaxial probe encircling a long ferromagnetic conducting tube. Experimental results, obtained for the case of a square wave excitation, are in excellent agreement with the predicted driver and pickup responses. Using the forward solutions, a novel inverse method, that enables simultaneous and accurate characterization of magnetic permeability and electrical conductivity, has been developed. Specifically, the method considers computed areas under scaled transient eddy current signal curves. In the generalized case, multiple parameters of interest can be extracted from a single transient signal by taking advantage of the frequency domain differentiation property of the Laplace transform. Preliminary experiments show that permeability and conductivity values, calculated for a variety of ferromagnetic and non-ferromagnetic tubes, agree well with published values (permeability) and with values obtained by four point measurement (conductivity). The inverse method introduced in this work may be straightforwardly extended to consider other parameters, such as lift-off and material thickness, and to consider other geometries, such as conducting plates.
机译：对于同轴探针环绕长铁磁导电管的情况，最近的分析解决方案可以正确描述电压控制的驱动器拾取电路中的瞬态涡流信号。在方波激励情况下获得的实验结果与预测的驱动器和拾音器响应非常吻合。使用正解，已经开发了一种新颖的逆方法，该方法能够同时准确地表征磁导率和电导率。具体而言，该方法考虑了按比例绘制的瞬态涡流信号曲线下的计算面积。在一般情况下，可以利用Laplace变换的频域微分特性从单个瞬态信号中提取多个感兴趣的参数。初步实验表明，针对各种铁磁和非铁磁管计算出的磁导率和电导率值与公布的值（磁导率）和通过四点测量获得的值（电导率）非常吻合。可以直接扩展这项工作中引入的逆方法，以考虑其他参数，例如剥离力和材料厚度，并考虑其他几何形状，例如导电板。

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