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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.40: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Planar flip-chip HTSC DC-SQUID gradiometers for non-destructive evaluations — •Christoph Becker¹, Alexander Steppke¹, Uwe Schinkel¹, Markus Buettner¹, Veit Grosse¹, Hendrik Schneidewind², Frank Schmidl¹, and Paul Seidel¹ — ¹Friedrich-Schiller-Universität Jena, Germany — ²Institut für Photonische Technologien e.V., Jena, Germany

For the detection of small magnetic signals, for example in applications like non-destructive evaluation DC-SQUID gradiometers are successfully used today. The low noise level of our sensors and the possibility of working in unshielded environments cannot be achieved with convential methods. The sensors made out of high-temperature superconducting thin film gradiometers are inductively coupled to a flux-transformer in a flip-chip configuration.

The field gradient resolution of the complete system is below 1 pT/(√Hz cm). In our investigations we focused on the spatial resolution of the sensors. Different approaches to characterize the resolution and methods to improve the signal to noise ratio for small magnetic sources are shown.