ECT Characterization of a Linear Defect From Multiple Angle Measurements

Dário Pasadas, Tiago Rocha, Artur Ribeiro, Helena Ramos

Abstract

This paper presents the characterization of a linear defect using the eddy current test (ECT) method with spatially uniform sinusoidal excitation. The eddy current probe includes a planar coil and a giant magneto-resistor sensor (GMR). To increase accuracy on the geometrical characterization of defects, measurements are performed at several rotation angles. The experimental magnetic field data obtained by scanning a given area is used to obtain the spatial eddy current distribution. For each scanning angle the eddy current map is obtained using an algorithm based on an image reconstruction technique solving the Biot-Savart inverse problem.

Keywords

eddy current testing, GMR, Inversion problem, defect

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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