Title :
High Tc superconducting magnetic multivibrators for fluxgate magnetic-field sensors
Author :
Mohri, K. ; Uchiyama, T. ; Ozeki, A.
Author_Institution :
Fac. of Eng., Nagoya Univ., Japan
fDate :
9/1/1989 12:00:00 AM
Abstract :
Sensitive and quick-response nonlinear inductance characteristics are found for high-Tc superconducting (YBa2 Cu3O7-x) disk cores at 77 K in which soft magnetic BH hysteresis loops are observed. Various fast-response magnetic devices such as modulators, amplifiers, and sensors are built using these cores. The magnetizing frequency can be set to more than 20 MHz, which is difficult to do with conventional ferromagnetic bulk materials such as Permalloy, amorphous alloys, and ferrite. New fast-response fluxgate-type magnetic-field sensors made from these cores, using AC and DC voltage sources, are presented. The former is used for second-harmonic type sensors, whereas the latter is for voltage-output multivibrator-type sensors. Stable, fast-response sensor characteristics were obtained for two-core multivibrators
Keywords :
barium compounds; electric sensing devices; magnetic cores; magnetic field measurement; magnetic hysteresis; magnetic superconductors; multivibrators; superconducting devices; yttrium compounds; 77 K; AC voltage source; DC voltage sources; YBa2Cu3O7-x disc cores; amplifiers; fast-response fluxgate-type magnetic-field sensors; fast-response magnetic devices; high temperature superconducting magnetic multivibrator; magnetizing frequency; modulators; quick-response nonlinear inductance characteristics; soft magnetic BH hysteresis loops; two-core multivibrators; voltage-output multivibrator-type sensors; Amorphous magnetic materials; Inductance; Magnetic cores; Magnetic hysteresis; Magnetic materials; Magnetic sensors; Sensor phenomena and characterization; Soft magnetic materials; Superconducting magnets; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
