Title :
The study of SPRM method for a short-length rod-shaped sample
Author :
Nonaka, Yoshihiro ; Nakane, Hiroshi ; Hasuike, Kiminori ; Maeda, Takao
Author_Institution :
Sci. Univ. of Tokyo, Shinjuku-ku, Tokyo, Japan
fDate :
12/1/1992 12:00:00 AM
Abstract :
The SRPM (simultaneous resistivity and permeability measurement) method, which simultaneously estimates the electrical and magnetic properties of a rod-shaped sample conductor, has been studied. In the SRPM method, the theoretical and measured values of the difference in the complex impedance of a solenoid coil with and without the sample are used. To estimate the resistivity of a short-length sample, the difference in the complex impedance was calculated by the method of weighted residual (MWR), as the difference calculated by the former SRPM method was valid only for a longer sample. The resistivity of copper samples of various lengths was estimated by the SRPM method, and their ratios to those measured by the DC four-probe method were obtained. The ratio was less than 1.3% when the ratio of the length of the sample conductor to the length of the solenoid coil was larger than 1 and less than 3.1% when the length ratio was less than 1
Keywords :
copper; electric impedance; electrical conductivity measurement; electromagnetic fields; magnetic permeability measurement; solenoids; Cu; DC four-probe; EM fields; Maxwell equations; complex impedance; magnetic properties; resistivity and permeability measurement; short-length rod-shaped sample; simultaneous measurement; solenoid coil; superconductor; weighted residual; weighted residuals method; Conducting materials; Conductivity; Conductors; Impedance; Magnetic materials; Magnetic properties; Permeability; Solenoids; Superconducting coils; Superconducting materials;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
