RESEARCH ON LIFTOFF ERROR SUPPRESSION METHOD FOR PULSED EDDY CURRENT TESTING OF CORROSION THINNING DEFECTS

被引：0

作者：

Chen, Tao ^{[1
]}

Huang, Linzhi ^{[1
]}

Lv, Cheng ^{[2
]}

Song, Xiaochun ^{[1
]}

Wu, Qiao ^{[1
]}

Tu, Jun ^{[1
]}

机构：

[1] The Key Laboratory of Modern Manufacturing Quality in Hubei Province, School of Mechanical Engineering, Hubei University of Technology, Wuhan

[2] Hubei Special Equipment Inspection Testing Institute, Wuhan

来源：

Materials Evaluation | 2025年 / 83卷 / 06期

基金：

中国国家自然科学基金;

关键词：

corrosion thinning defect; error suppression; liftoff error; pulsed eddy current; signal processing;

D O I：

10.32548/2025.me-04507

中图分类号：

学科分类号：

摘要：

Liftoff significantly affects the pulsed eddy current (PEC) signal, potentially masking defect information. To improve the accuracy of PEC testing for defect identification and quantification, a liftoff error suppression method applicable to the detection of metal corrosion thinning defects is proposed. A 2D model is established using COMSOL to analyze the variation of PEC signals at different liftoffs and to clarify the relationship between signal features and liftoff. The peak value of the differential signal and the integral area of the falling edge are selected in combination to reduce liftoff error and characterize changes in material thickness. Experimental results demonstrate that within a liftoff range of 9 mm, this method effectively identifies thickness variations of 1 mm in both aluminum and steel plates. The relative measurement errors are less than 15% for aluminum plates and less than 21% for steel plates. This approach enables PEC testing under unknown liftoff conditions, which is of great significance for the high-precision detection of corrosion thinning defects in metals with coatings or insulating layers. ©2025 American Society for Nondestructive Testing.

引用

页码：30 / 39

页数：9

共 31 条

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