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Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization

Lookup NU author(s): Professor Gui Yun TianORCiD, Yunlai Gao, Kong Jing Li, Dr Bin Gao

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

This paper reviews recent developments of eddy current pulsed thermography (iECPT) for material characterization and nondestructive evaluation (iNDE). Due to the fact that line-coil-based ECPT, with the limitation of non-uniform heating and a restricted view, is not suitable for complex geometry structures evaluation, Helmholtz coils and ferrite-yoke-based excitation configurations of ECPT are proposed and compared. Simulations and experiments of new ECPT configurations considering the multi-physical-phenomenon of hysteresis losses, stray losses, and eddy current heating in conjunction with uniform induction magnetic field have been conducted and implemented for ferromagnetic and non-ferromagnetic materials. These configurations of ECPT for metallic material and defect characterization are discussed and compared with conventional line-coil configuration. The results indicate that the proposed ECPT excitation configurations can be applied for different shapes of samples such as turbine blade edges and rail tracks.

Publication metadata

Author(s): Tian GY, Gao YL, Li KJ, Wang YZ, Gao B, He YZ

Publication type: Article

Publication status: Published

Journal: Sensors

Year: 2016

Volume: 16

Issue: 6

Print publication date: 01/06/2016

Online publication date: 08/06/2016

Acceptance date: 31/05/2016

Date deposited: 29/07/2016

ISSN (print): 1424-8220

Publisher: MDPI AG

URL: http://dx.doi.org/10.3390/s16060843

DOI: 10.3390/s16060843

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