SQUID fluxmeter having a pulse mulliplication circuit number for

Details SQUID fluxmeter having a pulse mulliplication circuit number for SQUID fluxmeter having a pulse mulliplication circuit number for

1993-07-26

1995-06-13

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, 505830, 327510, 327528, G01R 33035, H03K 2376

Patent

active

054246415

ABSTRACT:
A SQUID fluxmeter, which object is to accurately measure magnetic flux even if the input magnetic flux is largely changed in a short time, includes an 1-input superconducting OR gate for outputting pulses to the number of i in response to one input pulse from a SQUID, an AC bias current source for outputting a current I.sub.C of variable frequency 4if to a bias input node of the OR gate, an up/down counter for counting pulses from the SQUID and a control circuit for outputting a control signal CSi to the AC bias current source corresponding to the time differential value of the count value C1 of the counter and present value i. The response speed of the magnetic flux feedback through the feedback coil to the SQUID in response to the magnetic flux input to the SQUID is thereby made i times higher than that in the prior art.

REFERENCES:
patent: 4389612 (1983-06-01), Simmonds et al.
patent: 4672359 (1987-06-01), Silver
patent: 4947118 (1990-08-01), Fujimaki
patent: 5045788 (1991-09-01), Hayashi et al.

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