A double coil method for simultaneously measuring the resistivity, permeability, and thickness of a moving metal sheet

Author

Nonaka, Yoshihiro

Author_Institution

Dept. of Electr. Eng., Sci. Univ. of Tokyo, Japan

Volume

45

Issue

2

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

478

Lastpage

482

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.492771

Filename

492771