Method and apparatus for magnetic flux locking based upon a history of plural comparisons of the SQUID output signal and a predetermined signal
US5285155A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/846
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.