Title :
A double coil method for simultaneously measuring the resistivity, permeability, and thickness of a moving metal sheet
Abstract :
A method to determine the resistivity, permeability and thickness of moving magnetic sheets is described. The parameters of a sample sheet inserted between two coils facing each other are determined by measuring the impedance of the two coils at two different frequencies. To compare the experimental data with theoretical values, the difference in the impedance of the coils between two cases is used: when the current passes through the coils in the same direction, and in opposite directions. The method was tested by measuring the resistivity, permeability and thickness of nickel and iron sheets, 1 mm thick, moving at velocities 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
Keywords :
eddy currents; electrical conductivity measurement; electrical resistivity; iron; magnetic permeability measurement; nickel; solenoids; thickness measurement; 0 to 6 m/s; 1 mm; 400 Hz; 800 Hz; Fe; Ni; disc samples; double coil method; impedance; induced voltage; magnetic permeability; moving metal sheet; multiple parameters measurement; resistivity; simultaneously measurement; solenoid coils; thickness; Coils; Conductivity; Frequency measurement; Impedance measurement; Iron; Nickel; Permeability measurement; Testing; Thickness measurement; Velocity measurement;
