Title :
Three axis SQUID magnetometer for low-frequency geophysical applications
Author :
Kawai, Jun ; Uehara, Gen ; Kohrin, Toshiyuki ; Ogata, Hisanao ; Kado, Hisashi
Author_Institution :
Appl. Electron. Lab., Kanazawa Inst. of Technol., Ishikawa, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
We have developed a compact low-Tc three axis superconducting quantum interference device magnetometer (SQUID magnetometer) for geophysical applications at low frequency from dc up to 1 kHz, such as for searching for magnetized metals buried under the ground or moving magnetized objects, and for measurements of the geomagnetic fields. Relaxation oscillation SQUIDs (ROSs) which have larger voltage outputs compared to that of standard SQUIDs have been used so that larger dynamic performance is obtained for stable operation in the field
Keywords :
SQUID magnetometers; buried object detection; geomagnetism; geophysical equipment; geophysical prospecting; 1 Hz to 1 kHz; GFRP cryostat; buried magnetized metals; flux locked loop; geomagnetic field measurements; larger dynamic performance; low-frequency geophysical applications; moving magnetized objects; relaxation oscillation SQUIDs; reliability; slewing rate; stable operation; three axis SQUID magnetometer; Frequency measurement; Geomagnetism; Geophysical measurements; Interference; Magnetic devices; Magnetic field measurement; SQUID magnetometers; Superconducting devices; Superconducting magnets; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
