Eddy Current Control of Foiled Fiberglass
УДК 539.42
Abstract
The conductive layer thickness is an important characteristic of foiled fiberglass used for printed circuit board production. The method of multifrequency eddy current measurements is very effective for non-destructive testing of the conductive layer. This paper presents the results of such measurements of foiled fiberglass samples with different conductive layer thicknesses. Experimental hodographs of the "foil layer — eddy current sensor" system are described. The influence of interfering factors of various natures on hodographs is considered. It is noted that the results of low-frequency measurements depend on the product of the electrical conductivity and the conductive layer thickness, and it is difficult to separate these factors from the experimental data directly. Therefore, mathematical processing of measurements based on projection methods of multidimensional data analysis is proposed for eddy current control problems. Peculiarities of principal component analysis usage for eddy current control of copper foils with small thicknesses are described. It is shown that samples under eddy current control can be clearly distinguished by their conductive layer thickness through mathematical processing of measurement results when there are samples with known characteristics used as reference data. The obtained results can be used for further development of eddy current control of foiled fiberglass.
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References
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Copyright (c) 2026 Денис Александрович Дмитриев, Александр Владимирович Егоров, Виктор Владимирович Поляков
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