The design of a system of adjustable superconducting plates for balancing a gradiometer

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Overweg, J.A. and Walter-Peters, M.J. (1978) The design of a system of adjustable superconducting plates for balancing a gradiometer. Cryogenics, 18 (9). pp. 529-534. ISSN 0011-2275

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Abstract:The gradiometer of a SQUID-system for measuring very small biomagnetic signals should be made as insensitive as possible to the much larger uniform background fields. The balance of a gradiometer can be improved considerably by modifying the effective area of the gradiometer loops by a system of small adjustable superconducting plates.
This paper is intended as an aid for designing such a balancing system. We calculated the effective area of a gradiometer loop perpendicular to a rectangular or parallel to a circular plate. The paper contains graphs showing how large the plates have to be and where they must be placed.
The calculations show that for accurate balancing the distance of a plate to the wire of a loop must be large and that the plates must be as small as possible.
Item Type:Article
Copyright:© 1978 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/68427
Official URL:http://dx.doi.org/10.1016/0011-2275(78)90153-4
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