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首页> 外文期刊>NDT & E international >Signal Characteristics Of Differential-pulsed Eddy Current Sensors In The Evaluation Of Plate Thickness
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Signal Characteristics Of Differential-pulsed Eddy Current Sensors In The Evaluation Of Plate Thickness

机译：板厚评估中差分脉冲涡流传感器的信号特性

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摘要

Differential-pulsed eddy current (PEC) signals and their characteristics are investigated as tools for the evaluation of plate thickness by using the reflection-type PEC probe, which consists of an exciter coil and two sensor coils in a differential arrangement. Numerical and experimental signals are first compared to validate numerical simulation results, and good agreement between them is achieved. Investigation of differential PEC signals and their characteristics against thickness and conductivity variations shows that time-related features, such as the time-to-peak and the zero-crossing time, correspond well to plate thickness and conductivity. However, the feature quality of peak value turns out to be very poor. To improve this, the effects of coil characteristics on the input pulse, and consequently on differential PEC signals, are investigated. Results show that the feature quality of peak value may be improved by reducing the time constant, but doing so would worsen the quality of the other two features. Lift-off signals obtained by this probe show that the lift-off point of intersection also appears in the differential reflection-type PEC signals.
机译：通过使用反射型PEC探头，研究了差分脉冲涡流（PEC）信号及其特性，作为评估板厚的工具，该探头由一个励磁线圈和两个差分布置的传感器线圈组成。首先将数值和实验信号进行比较以验证数值模拟结果，并在两者之间取得良好的一致性。对差分PEC信号及其针对厚度和电导率变化的特性的研究表明，与时间相关的特征（例如峰峰值时间和过零时间）与板的厚度和电导率非常吻合。但是，峰值的特征质量非常差。为了改善这一点，研究了线圈特性对输入脉冲的影响，进而对差分PEC信号的影响。结果表明，通过减小时间常数可以提高峰值的特征质量，但这样做会使其他两个特征的质量变差。通过该探头获得的提离信号表明，相交的提离点也出现在差分反射型PEC信号中。

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