Title :
Multi-loop self-shielded dc-SQUID with meander-shaped input coil
Author :
Masalov, V.V. ; Samoos, A.N. ; Matlashov, A.N. ; Slobodchikov, V.Y. ; Maslennikov, Y.V.
Author_Institution :
Joint-Stock Company MEST, Moscow, Russia
fDate :
6/1/1995 12:00:00 AM
Abstract :
A multi-loop design insensitive to external uniform magnetic fields is suggested for a dc SQUID. The SQUID has a meander-shaped coupling coil, which show promise both for LTc and HTc biomagnetic measuring systems. The 16- and 32-loop versions of the SQUID were manufactured using niobium technology and were tested experimentally. On the basis of the experimental data it was shown that the use of LTc multi-loop SQUIDs makes it possible to develop biomagnetic measuring gradiometers with a resolution of the order of 3-4 fT/spl radic/Hz. A multiloop SQUID may be used with a flux transformer in the form of a first-order gradiometer free from conductor crossings. Such a gradiometer has a single-layer design and can be easily fabricated from HTc materials.<>
Keywords :
SQUID magnetometers; biomagnetism; biomedical measurement; high-temperature superconductors; HTc materials; LTc materials; Nb; biomagnetic measuring systems; flux transformer; gradiometers; magnetic fields; meander-shaped input coil; multi-loop design; niobium technology; self-shielded DC-SQUID; Biological materials; Biomagnetics; Conducting materials; Magnetic field measurement; Magnetic shielding; Niobium; Nitrogen; SQUIDs; Superconducting coils; Superconducting materials;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
