METHOD AND DEVICE FOR DETERMINING ELECTRIC CONDUCTING LAYER THICKNESS

摘要

FIELD: electrical engineering. SUBSTANCE: method involves measuring thickness (dr) of electric conducting layer coating electric conducting base material. Electric conductivities of the layer and base materials are different. Excitation coil through which high frequency electric current passes is brought close to the layer and it makes mechanical contact with it in particular cases so that electric eddy currents arises in the base material. Attached value corresponding to the total resistance is determined that is used as basis for determining layer thickness (dr) for instance by comparing with known reference values. High frequency electric current frequency f is selected in a way that single valued thickness (dr) measurement takes place when the electric current conductivities proportion is equal to 0.7-1.5. EFFECT: high accuracy and reliability of measurements. 11 cl, 3 dwg