论文信息 - Three axis squid magnetometer for low-frequency geophysical applications

Three axis squid magnetometer for low-frequency geophysical applications

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.

[1] Gen Uehara,et al. High sensitivity double relaxation oscillation superconducting quantum interference devices , 1994 .

[2] Panayiotis A. Varotsos,et al. Physical properties of the variations of the electric field of the earth preceding earthquakes, I , 1984 .

[3] J.P. Wikswo,et al. SQUID magnetometers for biomagnetism and nondestructive testing: important questions and initial answers , 1995, IEEE Transactions on Applied Superconductivity.

[4] J. Clarke,et al. REMOTE-REFERENCE MAGNETOTELLURICS: EQUIPMENT AND PROCEDURES* , 1983 .

[5] Yoshikazu Tanaka. Eruption mechanism as inferred from geomagnetic changes with special attention to the 1989–1990 activity of Aso volcano , 1993 .

[6] Gen Uehara,et al. System integration and trade-offs of SQUID system for biomagnetic applications , 1997 .

[7] J. Clarke,et al. Signals and Noise in Measurements of Low‐Frequency Geomagnetic Fields , 1988 .