Abstract
This paper presents a quantitative evaluation index efficiency of eddy current and defect interaction to evaluate the eddy current distribution induced by different planar eddy current probe. Efficiency’s definition and its calculation method are presented. Eddy current induced by three different exciting coils interacting with defects having different lengths and different orientation angles is analyzed by the proposed method. Finally, the paper highlights strengths and weaknesses of the studied current probe inducers and an improving method is proposed.
Highlights
To ensure the integrity and reliability of key mechanical structures, regular non-destructive testing is required.[1]
Because the performances of eddy current (EC) probes strongly depend on the direction of defect, improving the EC distribution in space domain or in time domain are two effective ways to make probes more sensitive to defect in any direction
To quantitatively analyze the EC distribution interaction with defects having a certain length and angle, because the EC is strongest disturbance by defect at the right angle of the EC and defect can only disturb the EC component which is perpendicular to the defect, interaction efficiency between EC distribution and virtual defect is proposed in this paper
Summary
To ensure the integrity and reliability of key mechanical structures, regular non-destructive testing is required.[1]. The efficiency curves about linear inducer have one flat top, and the different lengths and orientations of a virtual defect result in different widths and heights of the flat top. H(x) of different exciting coils and different length and orientation angle defect: (a) linear exciting coils; (b) circular exciting coils; (c) Koch curve exciting coils; 1: L = 5 mm; 2: L = 10 mm; 3: L = 20 mm; 4: L = 25 mm; 5: L = 40 mm (L is the height of the interaction domain).
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