Influence of rate of change of magnetization processes on sensitivity of magnetic adaptive testing

Tomas, I. and Vértesy, Gábor and Kadlecova, Jana (2009) Influence of rate of change of magnetization processes on sensitivity of magnetic adaptive testing. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 321. pp. 1019-1024. ISSN 0304-8853

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Abstract

The rate of change of magnetizing field (field-slope), applied for the nondestructive method of magnetic adaptive testing, influences both signal-to-noise ratio and sensitivity of the chosen magnetic parameters with respect to the investigated degradation of the ferromagnetic material (degradation functions). Dependence of the degradation functions sensitivity on the field-slope is analyzed in this paper. It is shown that where as sensitivity of the top-responsive degradation functions from around the top permeability of the nondegraded (reference) material drops down with increasing field-slope, sensitivity of the mild-responsive degradation functions from regions with lower permeability of the reference material is frequently field-slope-independent. The most favorable choice of the best degradation functions and of the proper magnetizing field-slope remains to be a question of optimum adaptation of the tests both to the investigated material and to the applied measuring technique.

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