Iterative Coarse to Fine Approach for Interpretation of Defect Profiles Using MFL Measurements

Publisher:
IEEE
Publication Type:
Conference Proceeding
Citation:
2015 IEEE 10th Conference on Industrial Electronics and Applications (ICIEA), 2015
Issue Date:
2015-06-15
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Magnetic Flux Leakage (MFL) is a commonly used technology for non destructive evaluation of ferromagnetic materials. MFL in general is used to estimate isolated defect geometry. In this study, a coarse to fine approach is proposed to interpret MFL measurements for continuous defect profiling. The coarse solution is implemented using a Gaussian Processes (GP) model and the fine approach is implemented using an unconstrained non-linear optimiser. This framework was tested on a 100 year old 600mm diameter cast iron pipe line. Some pipe sections were extracted, grit blasted and profiled using a sub millimetre accurate 3 - D laser scanner. The coarse to fine predictions were compared with the laser measured ground truth with just 1.2 mm RMS error.
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