Location

San Diego, CA

Start Date

1-1-1985 12:00 AM

Description

We have developed a reconstruction algorithm based on a rigorous electromagnetic model. This model and its associated algorithm assume that the flaw or ‘anomalous region’ lies within a cylinder whose properties are known, and for which we can easily compute a Green’s function. Figure 1 shows a cross-section of the physical system. We have normalized the system equations so that if a voxel is completely covered by a flaw, its conductivity is −1, if a voxel is completely without a flaw, its conductivity is 0, and if a voxel is partially covered by a flaw, its conductivity is between −1 and 0. Our objective is to produce a conductivity map for the mathematical mesh. This approach shows excellent promise as a basis for quantitative nondestructive evaluation.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

4A

Chapter

Chapter 3: Theoretical and Applied Inverse Methods

Section

Eddy-Current Applications

Pages

635-642

DOI

10.1007/978-1-4615-9421-5_70

Language

en

File Format

Application/pdf

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Jan 1st, 12:00 AM

An Eddy-Current Model and Inversion Algorithms for Three-Dimensional Flaw Reconstruction

San Diego, CA

We have developed a reconstruction algorithm based on a rigorous electromagnetic model. This model and its associated algorithm assume that the flaw or ‘anomalous region’ lies within a cylinder whose properties are known, and for which we can easily compute a Green’s function. Figure 1 shows a cross-section of the physical system. We have normalized the system equations so that if a voxel is completely covered by a flaw, its conductivity is −1, if a voxel is completely without a flaw, its conductivity is 0, and if a voxel is partially covered by a flaw, its conductivity is between −1 and 0. Our objective is to produce a conductivity map for the mathematical mesh. This approach shows excellent promise as a basis for quantitative nondestructive evaluation.