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Defect Detection with Motion Induced Eddy Currents in Aluminum

Rocha, T. ; Pasadas, D. ; Ribeiro, A. L. ; Ramos, H.

Defect Detection with Motion Induced Eddy Currents in Aluminum, Proc Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol. 0, pp. 0 - 0, May, 2013.

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Abstract
This paper presents a method of detecting defects on metal plates using eddy currents generated from the motion of the probe. Instead generating a time-varying magnetic field with a time-varying current imposed on an excitation coil, this method uses a moving permanent magnet to induce Eddy currents in the metal plate. The system developed contains a rail to guide the probe at a near-constant speed, a permanent magnet, a giant magnetoresistor (GMR) based sensor and a position encoder to accurately measure the probe speed and position.