PROCESS OF EDDY-CURRENT MEASUREMENT OF THICKNESS OF DIELECTRIC COAT ON CURRENT-CONDUCTING BASE Russian patent published in 2002 - IPC

FIELD: measurement technology. SUBSTANCE: eddy-current converter is positioned on side of reference sample which has no coat and frequency of self-excited oscillator is measured. Then converter is put on side of reference sample carrying coat of specified thickness and frequency of self-excited oscillator is measured again. After this converter is taken away from reference sample and other conductive objects to distance exceeding diameter of converter by factor of five as minimum. Coefficients of approximating curve are computed by measured values of frequencies and thickness of coat of reference sample. Thickness of coat of tested sample is determined by means of approximating curve and value of frequency of self-excited oscillator. Description gives dependencies for determination of coefficients of approximating curve and its formula. EFFECT: process makes it feasible to use only one reference sample, to raise measurement precision and to diminish labor input to process. 3 dwg