Analysis of a Nondestructive Evaluation Technique for Defect Characterization in Magnetic Materials Using Local Magnetic Measurements

Figure 2

Geometry ($xy$-plane) of the non-destructive evaluation setup, consisting of a single-sheet tester and a stack of steel laminations. The $x$ and $y$ axes are symmetry axes of the single-sheet tester. The complete setup is not symmetric any more because of the defect, but the SST itself remains symmetric. The goal is to determine the position $\alpha$ and the width $\beta$ of the defect zone by doing local $B$-measurements on the surface of the stack only.