Title :
Modulation effect in the magnetic shield with magnetic shaking
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
Modulation effect peculiar to the magnetic shield with magnetic shaking is presented, in which high frequency external magnetic fields penetrate the shielding wall with converting their frequencies into the low-frequency band of interest for SQUID magnetometry. The process of modulation is analyzed assuming nonlinearity in permeability of the shielding material under the magnetic shaking. The line spectra of the penetrating magnetic fields are well described by the theory. Methods to alleviate this effect are discussed
Keywords :
SQUID magnetometers; SQUIDs; magnetic fields; magnetic shielding; magnetometers; SQUID magnetometry; high frequency external magnetic fields; line spectra; low-frequency band; magnetic shaking; magnetic shield; modulation effect; penetrating magnetic fields; permeability; shielding wall; Frequency conversion; Magnetic domain walls; Magnetic flux leakage; Magnetic materials; Magnetic modulators; Magnetic shielding; Permeability; Saturation magnetization; Soft magnetic materials; Toroidal magnetic fields;
Journal_Title :
Magnetics, IEEE Transactions on
