Circuit for detecting AC magnetic field due to magnetic resonanc

Details Circuit for detecting AC magnetic field due to magnetic resonanc Circuit for detecting AC magnetic field due to magnetic resonanc

1988-03-28

1989-10-17

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

324318, G01V 300, G01R 3302

Patent

active

048750107

ABSTRACT:
In a signal detecting circuit of, for example, an NMR apparatus, a signal transmission path transmits an AC magnetic flux signal to be superposed on a DC magnetic field whose strength does not change with time during a period of signal detection. The signal transmission path comprises a superconducting closed loop including a receiving coil receiving the AC magnetic flux signal, an input coil applying the received AC magnetic flux signal as an input to a flux meter, and a variable resistor replacing part of the superconducting closed loop and having its resistance value changed in relation to a change in the strength of the DC magnetic field.

REFERENCES:
patent: 3667033 (1972-05-01), Davis
patent: 3829768 (1974-08-01), Nicol et al.
patent: 4390840 (1983-06-01), Ganssen et al.
patent: 4707661 (1987-11-01), Hoenninger, III et al.
patent: 4733182 (1988-03-01), Clarke et al.

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