Absorbing coating thickness measurement based on lift-off effect of eddy current testing

Issue title: Proceedings from the 16th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2013)

Guest editors: Xavier Maldague and Toshiyuki Takagi

Article type: Research Article

Authors: Cheng, Yuhua^{a; *} | Chen, Yifan^a | Jiang, Jixiang^a | Bai, Libing^a | Zhang, Bing^b

Affiliations: [a] School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, China | [b] School of Mechanical Engineering and Automation, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, Guangdong, China | Université Laval, Canada | Tohoku University, Japan

Correspondence: [*] Corresponding author: Yuhua Cheng, No. 2006, Xiyuan Ave., West Hi-Tech Zone, Chengdu 611731, Sichuan, China. Tel.: +86 28 6183 0301; Fax: +86 28 6183 0301; E-mail: yhcheng@uestc.edu.cn

Abstract: According to the lift-off effect of eddy current testing, a ferromagnetic absorbing coating thickness gauge was proposed in this paper. After comparison, hyperbolic regression model was adopted to estimate the relationship between the detecting coil impedance and the absorbing coating thickness. An efficient probe with high quality factor and temperature compensation was developed. At the same time, a novel and more flexible calibration method was designed in this paper to improve the measurement accuracy. The experimental results show that the thickness measurement error is less than 0.02 mm, which proves the validity of this absorbing coating thickness gauge.

Keywords: Lift-off effect, eddy current testing, absorbing coating, hyperbolic regression model

DOI: 10.3233/JAE-141847

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 323-330, 2014