Iterative coarse to fine approach for interpretation of defect profiles using MFL measurements

Publication Type:
Conference Proceeding
Proceedings of the 2015 10th IEEE Conference on Industrial Electronics and Applications, ICIEA 2015, 2015, pp. 1099 - 1104
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© 2015 IEEE. 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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