Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature
Measurement of radius of a metallic ball using eddy current testing based on peak frequency difference feature
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DOI：
10.1016/j.measurement.2021.109876
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发表时间：
2021-07-31
期刊：
影响因子：
5.6
通讯作者：
Yin, Wuliang
中科院分区：
文献类型：
--
作者：
Hu, Gang;Huang, Ruochen;Yin, Wuliang
本文提出了一种非接触式地测量金属球半径的线性涡流特征。在测量过程中，具有两个线圈的电磁涡流传感器与金属球同轴放置。众所周知，传感器和试件之间的距离（即提离）会影响涡流信号。本文发现电感谱的峰值频率特性与线圈中心与球的提离距离成线性关系。此外，峰值频率与提离的斜率与球的半径有关。根据边坡的试验和嵌入式分析结果，反演了金属球的半径。对6个不同半径的金属球进行了测量。利用该方法可以反演金属球的半径，误差小于2%。
This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2%.