Affiliations: [a] School of Information and Communication Engineering,
North University of China, Taiyuan, Shanxi, China | [b] State Key Laboratory for Strength and Vibration of
Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shannxi, China
Correspondence:
[*]
Corresponding author: Zhaoba Wang, School of Information and
Communication Engineering, North University of China, 3 Xueyuan Road, 030051,
Taiyuan, Shanxi, China. Tel./Fax: +86 351 3557475; E-mail: wzb15851@163.com
Abstract: The anti-corrosive coating in pipeline and oil tanker is taken as a
crucial component in petroleum industry and needs a robust NDE tool to evaluate
its thickness. For the thick coating on the curved steel bases of various
sizes, the eddy current sensor's evaluation capability for thick coating and
the influence of the test-piece sizes on the evaluation precision are two key
problems had to be solved. Taking into account the dimension effect of the
sensor on signals, a wide-range sensor was designed and applied to the coating
evaluation. The relationship between coil responses and liftoff was
investigated and a NDE strategy based on a polynomial coefficient database was
proposed to cope with the influence of test-piece sizes. Its applicability was
verified by simulation results.
