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Erschienen in:
1996 | OriginalPaper | Buchkapitel
Minimum-Norm Least-Squares Inverse for Magnetic Flux Leakage Image Reconstruction
verfasst von : A. C. Bruno
Erschienen in: Review of Progress in Quantitative Nondestructive Evaluation
Verlag: Springer US
Enthalten in: Professional Book Archive
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The main goal of this technique is to reconstruct the magnetic source distribution inside an inaccessible volume, from magnetic field measurements performed outside the volume. The approach we used models the unknown distribution as an array of magnetic dipoles with fixed positions but unknown strengths. Then magnetic field measurements can be written as a linear function of the unknown dipole strengths. The minimum-norm least-squares inverse finds the dipole strength distribution that minimizes the squared difference between the measured field and the field generated by the solution. We applied this technique successfully in situations where it would be difficult to distinguish between simulated single and multiple flaws.