Superconducting magnetic field sensing apparatus having digital

Details Superconducting magnetic field sensing apparatus having digital Superconducting magnetic field sensing apparatus having digital

1991-04-17

1993-09-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

307306, 505846, G01R 33035

Patent

active

052489418

ABSTRACT:
A magnetometer having high sensitivity and high resolution is achieved using superconductive circuit elements. The magnetometer includes a pick-up coil, amplifying transformer quantum flux parametron (QFP), latch, feedback gate and feedback inductor fabricated with superconducting elements and coupled to a bidirectional counter. The magnetometer implements an on-chip negative feedback loop. The pick-up coil senses an external magnetic field or gradient resulting in an induced current which is amplified and fed to the QFP which generates a directional indicator signal sent to the latch. When the polarity of the indicator is indicated as corresponding to the polarity of a latch clock signal, a current signal is sent to the feedback gate causing a packet of quantum flux to be generated. The packet is fed back through the feedback inductor, inducing a current in the pick-up coil which opposes the induced current attributable to the external magnetic field. When the induced current in the pick-up coil attributable to the external magnetic field is offset by the induced current attributable to the feedback flux, the magnetometer stabilizes.

REFERENCES:
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patent: 4866373 (1989-09-01), Harada et al.
patent: 4916335 (1990-04-01), Goto et al.
patent: 5045788 (1991-09-01), Hayashi et al.
Fujimaki, et al., "A Single-Chip SQUID Magnetometer", IEEE Trans., ED-35, pp. 2412-2418, No month, 1988.

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