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A Differential Planar Eddy Currents Probe: Fundamentals, Modelling and Experimental Evaluation

Rosado, L. S. ; Santos, T. S. ; Ramos, P.M. ; Vilaça, P. ; Piedade, M. S.

NDT and E International Vol. 51, Nº 1, pp. 85 - 93, October, 2012.

ISSN (print): 0963-8695
ISSN (online): 0963-8695

Journal Impact Factor: 2,225 (in 2014)

Digital Object Identifier: 10.1016/j.ndteint.2012.06.010

Abstract
This paper presents a new eddy current probe specifically designed to inspect imperfections
along Friction Stir Welding joints. The proposed probe has a planar design and a differential operation
introducing several innovative aspects in eddy currents generation and sensing. The fundamentals on
the probe operation are presented and explained in the presence of a metallic part to be inspected with
and without defects. A finite element model was used to detail the probe operation and to assess the
influence of several operational parameters on the probe response. Finally, the simulations were
validated experimentally using a prototype probe produced in printed circuit board and an aluminum
alloy block with standard defects produced using electro discharge machining.