Method and apparatus for compensating for variations in magnetic

Details Method and apparatus for compensating for variations in magnetic Method and apparatus for compensating for variations in magnetic

1991-09-05

1993-03-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

307306, 505846, G01R 33035

Patent

active

051948079

ABSTRACT:
A constant bias voltage is applied to plural superconducting quantum interference devices which are interconnected in parallel. Output currents from the superconducting quantum interference devices are supplied in added condition. Maximal-sequence codes are modulated by a modulation current corresponding to each device, and the modulated maximal-sequence codes are supplied to the modulation coil of each corresponding superconducting quantum interference device. The added output current is demodulated for each device by a maximal-sequence code which is phase shifted by the same quantity as the maximal-sequence code for modulation for each device.

REFERENCES:
patent: 4489274 (1984-12-01), Berlincourt
patent: 4663590 (1987-05-01), Gershenson et al.
patent: 4851776 (1989-07-01), Goto et al.
patent: 5093618 (1992-03-01), Goto et al.

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