Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.40: Poster
Tuesday, February 26, 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.