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Sensors 2016, 16(6), 843; doi:10.3390/s16060843

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

1
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2
School of Electrical and Electronic Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
3
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
4
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 20 April 2016 / Revised: 31 May 2016 / Accepted: 31 May 2016 / Published: 8 June 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4627 KB, uploaded 8 June 2016]   |  

Abstract

This paper reviews recent developments of eddy current pulsed thermography (ECPT) for material characterization and nondestructive evaluation (NDE). 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. View Full-Text
Keywords: eddy current pulsed thermography (ECPT); material characterization; nondestructive evaluation (NDE); multi-physical phenomenon; excitation configuration eddy current pulsed thermography (ECPT); material characterization; nondestructive evaluation (NDE); multi-physical phenomenon; excitation configuration
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tian, G.Y.; Gao, Y.; Li, K.; Wang, Y.; Gao, B.; He, Y. Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization. Sensors 2016, 16, 843.

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