Modification of a calibration method for conductometers

The paper presents an innovative and improved method for doubled calibration of an eddy-current conductometer. Implementation of the proposed method makes it possible to achieve independence of the instrument indications on surface condition of the examined parts. The calibrating function is determined on-line when the measurements are in progress on the basis of parameters that are assigned to the contact probe coil and calculated with use of general mathematic equations. The calculated correction parameter can be considered as a measure of the surface roughness. Application of the modification as described in this paper can contribute to efficiency improvement of operational examinations for components made of non-ferrous materials during their lifetime.