Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity - Tunneling, Josephson Junctions, SQUIDs

TT 15.7: Hauptvortrag

Dienstag, 27. März 2007, 16:00–16:30, H20

SQUID Technology for Geophysical Exploration — •Hans-Georg Meyer, Ronny Stolz, Andreas Chwala, Sven Linzen, and Volkmar Schultze — Institute for Physical High Technology, Albert-Einstein-Straße 9, D-07745 Jena, Germany

Magnetic measurements are widely used for geophysical exploration. The fields of applications are ranging from mineral exploration, environmental and military monitoring to archaeometry. During the past few years several SQUID systems for geomagnetic measurements have been developed and successfully tested. Compared to conventional systems their outstanding performance was demonstrated. The latest of such systems are mainly based on LTS SQUIDs and shall be summarized here.

Airborne geophysics is extremely interesting in prospecting, since they allow effectively covering large areas with sufficiently high spatial resolution in a short period of time. Geomagnetics detects basically anomalies of the Earth's magnetic field. In order to use sensitive SQUID gradiometers in airborne applications a high common mode rejection is necessary, since the parasitic areas of the SQUID gradiometer lead to motion noise if the gradiometer is tilted in the Earth's magnetic field. The recently developed planar LTS SQUID gradiometers with a base length of 3.5 cm show an intrinsic balance of about 10^4. In this way a noise limited gradient field resolution better than 100 fT/[m*sqrt(Hz)] down to 0.1 Hz is achieved. By means of the airborne SQUID system the complete gradient tensor of the Earth's magnetic field was measured with superior accuracy never reached so far.