Magnetic measurements are widely used for geophysical surveys. 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.

Ground-based Transient Electromagnetics is a powerful active method for a detailed investigation of orebodies. The SQUID vector magnetometer designed for that particular application case shows a 100 times better time resolution or a 10 times deeper detection range in comparison to the current induction coil or fluxgate systems.

Airborne geophysics is extremely interesting in prospecting for different applications, since they allow to cover large areas with sufficiently high spatial resolution in short time periods. Geomagnetic measurements detect basically anomalies of the Earths magnetic field.

The recently developed planar LTS SQUID gradiometers with a base length of 4 cm show an intrinsic balance of about 10⁴ and a gradient field resolution better than 100 fT/(mHz^1/2) down to 0.1 Hz. By means of the airborne SQUID system the complete gradient tensor of the Earths magnetic field was measured with superior accuracy never reached so far.

Archaeometry with magnetic field sensors needs high spatial resolution down to the range of 10 cm. To cover reasonably large areas there is a need for high sensitive gradiometers with a high bandwidth, allowing a fast scanning speed directly above the soil. For this purpose a portable LTS SQUID gradiometer is under development. First archaeometric field experiments show very promising results.

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