A miniature squid magnetometer for biomagnetic measurements with improved selectivity

J.A. Overweg, M.J. Peters

Research output: Contribution to journalArticleAcademic

2 Citations (Scopus)
36 Downloads (Pure)

Abstract

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
Volume39
Issue numberC6
DOIs
Publication statusPublished - 1978

Keywords

  • IR-104435

Cite this

Overweg, J.A. ; Peters, M.J. / A miniature squid magnetometer for biomagnetic measurements with improved selectivity. In: Journal de Physique. Colloque. 1978 ; Vol. 39, No. C6. pp. 1226-1227.
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A miniature squid magnetometer for biomagnetic measurements with improved selectivity. / Overweg, J.A.; Peters, M.J.

In: Journal de Physique. Colloque, Vol. 39, No. C6, 1978, p. 1226-1227.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - A miniature squid magnetometer for biomagnetic measurements with improved selectivity

AU - Overweg, J.A.

AU - Peters, M.J.

PY - 1978

Y1 - 1978

N2 - 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.

AB - 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.

KW - IR-104435

U2 - 10.1051/jphyscol:19786542

DO - 10.1051/jphyscol:19786542

M3 - Article

VL - 39

SP - 1226

EP - 1227

JO - European physical journal. Special topics

JF - European physical journal. Special topics

SN - 1951-6355

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