Method and apparatus for magnetic flux locking based upon a hist

Details Method and apparatus for magnetic flux locking based upon a hist Method and apparatus for magnetic flux locking based upon a hist

1991-09-27

1994-02-08

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 3302, G01R 33035

Patent

active

052851559

ABSTRACT:
Output currents from a superconducting quantum interference device which corresponds to magnetic flux guided thereto are compared with a predetermined value which corresponds to a magnetic flux locking point so as to detect a direction of shift with respect to the magnetic flux locking point. A shift quantity is judged to determine whether or not it is large based upon a history of the shift direction. A variation value component of an estimate feedback quantity is varied by taking this history into consideration. The estimate feedback quantity is used to guide magnetic flux for compensating for variation in the magnetic flux which is guided to the superconducting quantum interference device.

REFERENCES:
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patent: 4672359 (1987-06-01), Silver
H. Matz et al, "High Slew Rate Gradiometer Prototype with Digital Feedback Loop of Variable Step Size", Cryogenics, vol. 30, No. Guildford GB, pp. 330-334 (Apr. 1990).
M. C. Buncick et al, "Computer-Controlled Method for Removal of Stray Fields", Review of Scientific Instruments, vol. 54, No. 1, New York, U.S., pp. 100-103 (Jan. 1983).
D. Drung, "Digital Feedback Loops for D.C. SQUIDs", Cryogenics, vol. 26, No. 11, Guilford, GB, pp. 623-627 (Nov. 1986).
A. I. Abu-El-Haila et al, "Improving Performance of Digital Sinusoidal Oscillators by Means of Error Feedback Circuits", IEEE Transactions on Circuits and Systems, vol. 33, No. 4, New York, U.S. (Apr. 1986).

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