A miniature squid magnetometer for biomagnetic measurements with improved selectivity

J.A. Overweg, M.J. Peters

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The effective area of a circular wire loop to a uniform field is reduced considerably if it is placed close to a large superconducting disc. The effective area to the field of a nearby magnetic dipole is reduced much less. Such a selective pickup loop is used to construct a small first order gradiometer, with a baseline of 3 cm. Its sensitivity to fields of nearby sources is comparable to that of a much larger symetric second order gradiometer wheras its sensitivity to inhomogeneous magnetic noise is much less. Another advantage of the unsymmetric configuration is, that it has a smaller selfinductance than a conventional gradiometer, so that a better flux transfer to the SQUID is possible.
Original languageUndefined
Pages (from-to)1226-1227
JournalJournal de Physique. Colloque
Issue numberC6
Publication statusPublished - 1978


  • IR-104435

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