Magnetic flux measuring apparatus by hysteresis...

Details Magnetic flux measuring apparatus by hysteresis... Magnetic flux measuring apparatus by hysteresis...

2007-07-24

2007-07-24

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C505S846000, C505S162000

Reexamination Certificate

active

11565848

ABSTRACT:
In a SQUID magnetometer, high resolution, a high slew rate, and a high dynamic range are achieved without using expensive circuit components having a large number of processing bits and enabling a high speed processing operation. A digital FLL circuit using a double counter system is provided. This circuit utilizes two or more counters, for example, a change range counter in a digital FLL for carrying out a processing operation at a high speed and a reproducing counter in a control/measuring computer. In addition, in the present invention, hysteresis characteristics having a 1Φ0positive margin is used. That is, a change of a state of a magnetic flux is counted by means of a counter. At the time of this change, control is made so as to track a different channel between cases in which a magnetic flux increases and decreases, thereby stabilizing the control.

REFERENCES:
patent: 5532592 (1996-07-01), Colclough
patent: 6-289110 (1994-10-01), None
patent: 9-329656 (1997-12-01), None
Dietmar Drung, “High-Tcand low-Tcdc SQUID electronics”, Superconductor Science and Technology, vol. 16, 2003, pp. 1320-1336, Institute of Physics Publishing.

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