Experimental Study of Different Innovative Measurement Methodologies Applied to a Canned Pulsed Eddy Current Testing Probe Suitable For Dilation Measurement of Test Specimens

T. V. Shyam, A. Sharma, V. Patankar, A. Kaushik, S. Sinha, L. Ferry
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Abstract

A compact pulsed eddy current testing probe is being developed for the online dilation measurement of test specimens, examined in the high-temperature environment of material testing reactors. The probe has to be canned with metallic clad to protect it from the corrosive sodium-potassium coolant medium present in the material testing reactor. Electromagnetic modelling of the probe was carried out to compute the distribution of time-dependent eddy current density in the vicinity of the probe. It is understood that the slope of the pulsed eddy current signals in the specific time zone where the lift-off point of intersection occurs show a good correlation to the distance between the face of the probe and the test specimen. This paper discusses the experimental study of employing different measurement methodologies at room temperature with the canned pulsed eddy current probe to evaluate its feasibility for dilation measurement. It is observed that a phenomenon of a divergence of signals, akin to the lift-off point of intersection, occurs just after the transient part of the pulsed eddy current signals. Slope analysis of these diverging pulsed eddy current signals was carried out for characterisation of the probe in the air medium as well as the metallic medium present in the gap between the probe face and the test specimen.
不同创新测量方法在适用于试样膨胀测量的罐装脉冲涡流测试探头上的实验研究
研制了一种小型脉冲涡流测试探头,用于材料试验堆高温环境下试样的在线膨胀测量。探针必须用金属包层封装,以保护它不受材料测试反应堆中腐蚀性钠钾冷却剂介质的影响。对探头进行了电磁建模,计算了探头附近随时间变化的涡流密度分布。可以理解,脉冲涡流信号在交点上升点所在的特定时区的斜率与探头端面与试件之间的距离具有良好的相关性。本文讨论了在室温下采用不同测量方法的脉冲涡流探头的实验研究,以评估其进行膨胀测量的可行性。在脉冲涡流信号的暂态部分之后,出现了一种类似于交点起飞的信号发散现象。对这些发散的脉冲涡流信号进行斜率分析,以表征探针在空气介质中的特性,以及探针表面和试样之间间隙中存在的金属介质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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