Planar high-temperature superconducting dc-SQUID gradiometers for different applications

We have developed different kinds of planar high-temperature superconducting dc-SQUID gradiometers with performances suitable for various applications in unshielded environments. Robust small sensors were realized for non-destructive evaluation. Their long-term stability was improved by new passivat...

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Bibliographic Details
Published in:Superconductor science & technology 2006-03, Vol.19 (3), p.S143-S148
Main Authors: Seidel, P, Schmidl, F, Becker, C, Springborn, U, Biering, S, Grosse, V, Foerster, T, Lorenz, P, Bechstein, R
Format: Article
Language:English
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Summary:We have developed different kinds of planar high-temperature superconducting dc-SQUID gradiometers with performances suitable for various applications in unshielded environments. Robust small sensors were realized for non-destructive evaluation. Their long-term stability was improved by new passivation technologies. For biomagnetic measurements the required higher field sensitivity in unshielded environments gave rise to many technological problems. Some solutions for crossovers, low-ohmic contact layers and new kinds of incoupling antenna structures are demonstrated. Different layouts are discussed with respect to their sensitivity, spatial resolution and behaviour in an external magnetic field. Finally some measurements were made to demonstrate the performance of these sensors in various applications.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/19/3/021