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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity - Tunneling, Josephson Junctions, SQUIDs
TT 15.8: Vortrag
Dienstag, 27. März 2007, 16:30–16:45, H20
A LTS-SQUID System for Geomagnetic Prospection — •Sven Linzen1, Ronny Stolz1, Volkmar Schultze1, Andreas Chwala1, Marco Schulz1, Tim Schüler2, Nikolai Bondarenko1, Sebastian Hauspurg1, and Hans-Georg Meyer1 — 1Institute for Physical High Technology, A.-Einstein-Str. 9, D-07745 Jena — 2Thuringian State Office for Archaeology, Humboldtstr. 11, D-99423 Weimar, Germany
The geomagnetic mapping of large areas gains in importance in archaeology. High sensitive sensors are necessary to resolve the small magnetic signals of buried structures like adobe walls, tombs or magnetic traces of ancient wood palisades which are completely decomposed nowadays. The sensitivity and bandwidth of state-of-the-art caesium magnetometer systems, however, are not sufficient in many cases. Thus, we built a niobium SQUID based system to overcome these limitations. Our highly balanced planar gradiometers as well as the SQUID electronics and data acquisition are carried by a non-metallic cart which allows a soft and fast motion over ground. An inertial system as well as differential GPS completes the setup which provides us the local position of our gradiometers with a resolution of 10 cm. Fast mapping with about one hectare per hour can be performed with the system pulled by a cross-country car. We present experimental data which were acquired during several field campaigns in Europe and South America. Furthermore, we discuss the application of our system in foundation soil analysis.
This work was supported by the German BMBF, the Free State of Thuringia, and the European Union.