Title :
A new measuring system of initial relative permeabilities by using a high-Tc superconductor at a temperature of 77.4 K
Author :
Itoh, Mineo ; Ohyama, Takashi
Author_Institution :
Dept. of Electr. Eng., Kinki Univ., Higashi-Osaka, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
A system for the measurement of the initial relative permeability (μsi) of magnetic materials at the temperature corresponding to the boiling point of liquid nitrogen (77.4 K) is discussed. The system makes use of magnetic rods as the measurement samples, a superconducting Y-Ba-Cu-O (YBCO) rod as the standard sample, an excitation coil, and a differential coil. The authors examine the principle of the measuring system and the frequency characteristics of μsi for typical magnetic materials at a temperature of 77.4 K
Keywords :
barium compounds; high-temperature superconductors; magnetic permeability measurement; yttrium compounds; 77.4 K; Y-Ba-Cu-O; differential coil; excitation coil; frequency characteristics; high-Tc superconductor; initial relative permeabilities; magnetic materials; magnetic rods; measuring system; Frequency measurement; Magnetic liquids; Magnetic materials; Measurement standards; Nitrogen; Permeability measurement; Superconducting coils; Superconducting magnets; Temperature; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
