Robust Parameter Design of Eddy Current Measuring Devices for Magnetic Permeability of a Moving Strip of Ferromagnetic Rolled Metal

Abstract

A method is proposed for increasing the signal-to-noise ratio SNR of surface eddy current magnetic permeability meters withorthogonal rectangular coils for a moving strip of ferromagnetic rolled metal. As a result of robust parameter design of theprobes, their optimal structures are determined using the design of experiments theory. Specific examples demonstrate theeffectiveness of the method, which, in addition to increasing the SNR, also simultaneously reduces variations in the outputsignal caused by interfering factors. To create a Taguchi design of experiments, a magnetodynamic model of the probe overa moving test object was used along with orthogonal arrays. Numerical computer simulations confirm the reliability of theidentified optimal structures of eddy current probes. Using variance ANOVA analysis, the ranks of influence of design andoperating parameters on the SNR of probes were established. Based on this, technical requirements for the accuracy of manu-facturing their structures and conditions for maintaining the stability of the probe’s operating modes have been formulated.