Thickness measurements with use of the eddy-current method

The paper deals with the idea how to efficiently measure thickness of thin sheets and foils made of electrically conductive nonferromagnetic materials. The measurement method based on application of eddy currents seems to be an interesting alternative when the examined foil or coating is accessible only from one side or the foil or coating is covered with another non-conductive material. The proposed method consists in automatic adjustment of frequency for the excitation current and in the original calibration process that can be carried out with use of patters.