Eddy-current modeling using neural networks

Lloyd G. Allred

doi:10.1117/12.382915

14 April 2000 Eddy-current modeling using neural networks

Lloyd G. Allred

Proceedings Volume 3962, Applications of Artificial Neural Networks in Image Processing V; (2000) https://doi.org/10.1117/12.382915
Event: Electronic Imaging, 2000, San Jose, CA, United States

Abstract

There is a considerably history of using Eddy Current measurements for inspecting metal surfaces. The interpretation of the results, however, has been somewhat subjective. The sensitivity of the Eddy Current measurement to changes in material thickness is easily demonstrated. However, the reconstruction of thickness from the measurements (with any degree of confidence) has remained elusive. Part of the issue is the additional sensitivity of Eddy Current measurements to Lift distance and local geometry. This project is a culmination of an feasibility study to see if neural networks could provide estimates of material thicknesses for thin materials (< 0.15 inches or 4 mm) for metals with low conductivity (approximately 0.7 x mega/Ohm cm). The study a neural network model, whose accuracy varies depending upon the conditions. It turns out that the conditions required for good accuracy are usually not the conditions one wants to take measurements. The model not only suggests why this problem has been unwieldy, but also suggests that most of the difficulties could be alleviated by using an independent source to measure the Lift distance.

Citation Download Citation

Lloyd G. Allred "Eddy-current modeling using neural networks", Proc. SPIE 3962, Applications of Artificial Neural Networks in Image Processing V, (14 April 2000); https://doi.org/10.1117/12.382915

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KEYWORDS

Neural networks

Data modeling

Metals

Distance measurement

Inspection

Optical sensors

CT reconstruction

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