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Integrated LTS gradiometer SQUID systems for measuring of magnetic field distributions in an unshielded environment

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9 Author(s)
P. Weber ; Inst. of Solid State Phys., Friedrich-Schiller-Univ., Jena, Germany ; V. M. Zakosarenko ; K. -H. Berthel ; K. Bluthner
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Planar dc SQUID gradiometers with integrated antenna were designed for measurement of field distributions with gradients much smaller than 1 pT/cmHz/sup 1/2/ in an unshielded environment. Four types of first-order-gradiometer SQUIDs were fabricated in Nb-Pb technology and investigated. Their layouts are highly symmetrical and they can be made also with HTS materials. Further reduction of the effect of disturbances was achieved with a second order gradiometer realized electronically. The stable function of the systems under unshielded conditions is shown.<>

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:5 ,  Issue: 2 )