GMR versus differential coils in velocity induced eddy current testing

Author

Ramos, Helena G. ; Rocha, T. ; Ribeiro, Artur L. ; Pasadas, Dario

Author_Institution

Inst. de Telecomun., Univ. de Lisboa, Lisbon, Portugal

fYear

2014

fDate

12-15 May 2014

Firstpage

915

Lastpage

918

Abstract

This paper presents a development on a new nondestructive testing method using eddy currents induced by velocity. This new method uses a constant magnetic field that attached to a moving media induces eddy currents in the conductive material to be tested. By measuring the opposing magnetic field generated by the eddy currents it is possible to obtain information regarding the presence of defects. Two different magnetic field sensors, GMR and differential pick-up coils, were used and compared in the detection of perpendicular components of the magnetic field created by disrupted eddy currents due to linear defects machined on an aluminum plate.

Keywords

aluminium; eddy current testing; giant magnetoresistance; magnetic sensors; Al; GMR; aluminum plate; conductive materials; constant magnetic fields; differential pick-up coils; disrupted eddy currents; linear defects; magnetic field sensors; nondestructive testing method; velocity induced eddy current testing; Coils; Eddy currents; Magnetic field measurement; Magnetic fields; Magnetic sensors; Probes; GMR; Velocity induced; differential pick-up coils; eddy current testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014 IEEE International

Conference_Location

Montevideo

Type

conf

DOI

10.1109/I2MTC.2014.6860875

Filename

6860875