Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

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.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

15B

Chapter

Chapter 8: Systems, New Techniques and Process Control

Section

New Techniques

Pages

2219-2224

DOI

10.1007/978-1-4613-0383-1_291

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Minimum-Norm Least-Squares Inverse for Magnetic Flux Leakage Image Reconstruction

Seattle, WA

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.