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首页> 外文期刊>Magnetics, IEEE Transactions on >Decoupling the Influence of Permeability and Conductivity in Pulsed Eddy-Current Measurements
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Decoupling the Influence of Permeability and Conductivity in Pulsed Eddy-Current Measurements

机译：解耦在脉冲涡流测量中磁导率和渗透率的影响

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摘要

Eddy-current (EC) sensors are widely used in the industry for nondestructive evaluation (NDE) and structural health monitoring (SHM). It has this wide acceptance mainly because it has high tolerance to harsh environments, low cost, and high bandwidth. Its variant pulsed eddy current (PEC) provides even more depth information of test materials, which can be applied in liftoff measurement (displacement and coating thickness measurement), defect measurement, and material characterization. However, PEC sensors are prone to measurement errors due to a phenomenon called electrical runout (ERO), which is attributed to the inhomogeneity of the test material. The main thrust of this paper is to investigate, therefore, the contributions of the electromagnetic properties (permeability and conductivity) of the sample to ERO with a view to separate the influence of these two properties. Both time-domain and frequency-domain analyses are carried out in this investigation viz-a-viz: transient response, differential normalized response, magnitude spectrum, and normalized magnitude spectrum. This paper reveals that conductivity effects are prominent in the rising edge of the transient response, hence, changing the spectral pattern in the frequency domain while permeability effects dominate in the stable phase of the transient response, thus this effect can be suppressed or reduced by normalization showing that it is only an amplitude change.
机译：涡流（EC）传感器在行业中广泛用于无损评估（NDE）和结构健康监测（SHM）。它之所以被广泛接受，主要是因为它具有对恶劣环境的高耐受性，低成本和高带宽。它的变型脉冲涡流（PEC）提供了更多的测试材料深度信息，可用于剥离测量（位移和涂层厚度测量），缺陷测量和材料表征。但是，PEC传感器由于一种称为电跳动（ERO）的现象而容易产生测量误差，这是由于测试材料的不均匀性引起的。因此，本文的主要目的是研究样品的电磁性能（磁导率和电导率）对ERO的贡献，以分离这两种性能的影响。在此研究中同时进行了时域和频域分析，即瞬态响应，差分归一化响应，幅度谱和归一化幅度谱。本文揭示了电导率效应在瞬态响应的上升沿中很明显，因此，在频域中改变频谱模式，而磁导率效应则在瞬态响应的稳定相位中占主导地位，因此可以通过归一化来抑制或减小这种效应。表明这只是幅度变化。

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