Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-02-21
1993-07-27
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
324202, 505846, G01R 3302, G01R 3500, G01R 33035
Patent
active
052313530
ABSTRACT:
A DC superconducting quantum interference device has a superconductive ring and a feedback modulation coil for detecting a magnetic field. A variable bias current is applied to the superconductive ring and a modulating signal is applied to the feedback modulation coil. A signal change-over circuit is provided for superposing a false signal on the modulating signal, the false signal electrically simulating the effect of an applied magnetic field to enable adjustment of the variable bias current and the modulating signal under measurement conditions. A flux locked loop circuit of the DC superconducting quantum interference device has an external input terminal or a low-frequency oscillator for supplying a low-frequency signal to the signal change-over circuit which is superposed on the modulating signal applied to the feedback modulation coil. In this manner, the conditions for adjustment and measurement are not changed thereby facilitating the adjustment so that the DC superconductive quantum interference device effectively offsets a disturbing magnetic field.
REFERENCES:
patent: 4389612 (1983-06-01), Simmonds et al.
Nakayama Satoshi
Odawara Akikazu
Shimizu Nobuhiro
Adams Bruce L.
Seiko Instruments Inc.
Snow Walter E.
Wilks Van C.
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