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SVM Classification of Thickness and Lift-off Using Transient Eddy Current Oscillation Method

Angani, C. S ; Ramos, H. ; Rocha, T. ; Ribeiro, A. L.

SVM Classification of Thickness and Lift-off Using Transient Eddy Current Oscillation Method, Proc IEEE International Instrumentation and Measurement Technology Conference I2MTC, Taipei, Taiwan, Vol. 1, pp. 1 - 6, May, 2016.

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Abstract
Wall-thinning in stainless steel structures due to corrosion and surface erosion produced by the harsh operating conditions and by the flowing commodity origins pipeline failures. Thus, the detection of a change in local wall thickness of pipelines is extremely important for accident reduction. A new nondestructive testing (NDT) method called transient eddy current oscillations (TECO) is proposed in this paper to detect a change in the thickness of stainless steel covered with insulation. This method uses a probe which consist a capacitor to discharge through an induction coil (excitation coil) and the resultant magnetic field is detected by using a Hall-effect sensor. Stainless steel test specimens of different thicknesses were prepared to test the feasibility of the method. Several thicknesses of plastic plates were used to simulate the insulation on the steel plates. Different features were used in the response voltage to detect the thickness of the test specimen and separation of lift-off. To improve accuracy model-based support vector machine (SVM) analysis was applied on the experimental data. By incorporating several features at the same time, this technique avoids and surpasses the limitation of the traditional NDT methods used for prediction of wall-thinning.