Determination of Surface Crack Orientation Based on Thin-Skin Regime Using Triple-Coil Drive-Pickup Eddy-Current Sensor

被引:34
作者
Lu, Mingyang [1 ]
Meng, Xiaobai [2 ]
Huang, Ruochen [1 ]
Chen, Liming [1 ]
Tang, Zezhi [1 ]
Li, Junshi [1 ]
Peyton, Anthony [1 ]
Yin, Wuliang [1 ]
机构
[1] Univ Manchester, Sch Elect & Elect Engn, Manchester M13 9PL, Lancs, England
[2] Univ Northampton, Fac Art Sci & Technol, Northampton NN1 5PH, England
基金
英国工程与自然科学研究理事会;
关键词
Angled crack; defect orientation; eddy-current (EC) sensor; nondestructive testing; thin-skin regime;
D O I
10.1109/TIM.2020.3044729
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Electromagnetic sensors have been used for inspecting small surface defects of metals. Based on the eddy-current (EC) thin-skin regime, a revised algorithm is proposed for a triple-coil drive-pickup EC sensor scanning over long surface crack slots (10 mm) with different rotary angles. The method is validated by the voltage measurement of the designed EC sensor scanning over a benchmark (ferromagnetic) steel with surface defects of different depths and rotary angles. With an additional sensing coil for the designed EC sensor, the defect angle (or orientation) can be measured without spatially and coaxially rotating the excitation coil. By referring to the voltage change (due to the defect) diagram (voltage sum versus voltage different) of two sensing pairs, the rotary angle of the surface crack is retrieved with a maximum residual deviation of 3.5%.
引用
收藏
页数:9
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