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Uniform Eddy Current Probe Implementation Using Planar Eexcitation Coil and GMR Sensor Array

Postolache, O. ; Ribeiro, A. L. ; Ramos, H.

Uniform Eddy Current Probe Implementation Using Planar Eexcitation Coil and GMR Sensor Array, Proc IMEKO TC4 Symp., Natal, Brazil, Vol. 1, pp. 1 - 5, September, 2011.

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Abstract
Defect detection in conductive plates represents an important issue. This work presents designed and implemented uniform eddy current probe architecture (UECP) that includes a planar excitation coil and a GMR magnetometer sensor array as part of a non-destructive testing (NDT) system developed using a virtual instrument system technology. The usage of GMR sensors provides frequency independent sensitivity to the UECP, assuring speed, depth, and higher resolution in eddy-current testing, while the usage of a set of GMR sensors allows rapid scanning of an area for defects in a single pass.
A practical approach concerning the UECP design, implementation and experimental results obtained on cracks detection machined in aluminum plates for a single or multiple GMR sensor usage as main parts of UECP are presented. Experimental results regarding the usage of the novel eddy current probe to detect induced flaws in aluminum plates are included in the paper.