IMAGE PROCESSING OF DATA OBTAINED IN EDDYCURRENT NONDESTRUCTIVE EVALUATION OF METALLIC PLATES

• Abstract:

  This paper describes the usage of a planar excitation coil in a nondestructive testing experiment, using the eddy current method under sinusoidal excitation. After scanning a rectangular area on the metallic surface of the specimen under test, the probe signals obtained by a giant magneto-resistor sensor, were displayed in the form of a 2D representation. To determine the geometric form of the defects inside an aluminum plate, an inversion algorithm was tested. The algorithm is based on a kernel method. It uses the Discrete Fourier Transform (DFT) and Tikhonov regularization to obtain the spatial distribution of currents inside the aluminum plate.
• Keywords:

  non-destructive evaluation, eddy-currents, ill-posed problems, Tikhonov regularization
• Download:

  IMEKO-WC-2012-TC4-O17.pdf
• DOI:

  _unreg_wc-2012.TC4-O17

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