A DOUBLE COIL METHOD FOR SIMULTANEOUSLY MEASURING THE RESISTIVITY, PERMEABILITY, AND THICKNESS OF A MOVING METAL SHEET

A method to determine the resistivity, permeability and thickness of m oving magnetic sheets is described, The parameters of a sample sheet i nserted between two coils facing each other are determined by measurin g the impedance of the two coils at two different frequencies, To comp are the experimental data with theoretical values, the difference in t he impedance of the coils between two cases is used: when the current passes through the coils in the same direction, and in opposite direct ions, The method was tested by measuring the resistivity, permeability and thickness of nickel and iron sheets, 1 mm thick, moving at veloci ties varying from 0 to 6 m/s, It was possible to accurately determine the resistivity, thickness, and permeability within 10%, 10%, and 20%, respectively, at frequencies of 400 and 800 Hz.