Superconducting gradiometer coil system for an apparatus for the

Details Superconducting gradiometer coil system for an apparatus for the Superconducting gradiometer coil system for an apparatus for the

1984-06-14

1986-09-23

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

G01R 3302, G01R 33035

Patent

active

046138170

ABSTRACT:
A superconducting gradiometer coil system is provided for an apparatus for the multi-channel measurement of weak non-stationary magnetic fields in a field intensity range under 10.sup.-10 T. The apparatus includes, in each channel, at least one detection coil and at least one compensation coil comprising a gradiometer coil pair, a superconducting quantum interference device (SQUID) and corresponding superconducting connecting members coupling the coils and the SQUIDs, and electronic apparatus for evaluating, processing and displaying the information generated by the quantum interference devices. The gradiometer coil system permits a relatively simple one-time adjustment and has an active area as small as possible. At least the gradiometer detection and compensation coils and their mutual connecting elements are deposited as planar thin-film structures on a common rigid support body. The compensation coils are combined to form a reference coil arrangement about which the individual detection coils are disposed. In particular, the compensation coils of the reference coil arrangement can be formed at least partially of individual loops which surround each other and lie in one plane.

REFERENCES:
patent: 4320341 (1982-03-01), Lutes
patent: 4386361 (1983-05-01), Simmonds
patent: 4518868 (1985-05-01), Harada et al.
Swithenby, "SQUIDs and their Applications in the Measurement of Weak Magnetic Fields", J. Phys. E: Sci. Instrum., 1980, pp. 801-813.
Williamson et al., "Application of SQUID Sensors to the Investigation of Neutral Activity in the Human Brain", IEEE Trans. on Mag., May 1983, pp. 835-844.
Romani et al., "Biomagnetic Instrumentation", Rev. Sci. Instrm. 53(12), Dec. 1982, pp. 1815-1845.
Clarke, "Advances in SQUID Magnetometers", IEEE Trans. on Electron Devices, vol. ED-27, No. 10, Oct. 1980, pp. 1896-1908.

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