Electricity: measuring and testing – Magnetic – Magnetometers
Reexamination Certificate
2005-07-12
2005-07-12
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetometers
Reexamination Certificate
active
06917197
ABSTRACT:
The invention relates to a device for setting an operating point of a magnetic field sensor having a periodic characteristic, in particular for a device for detecting a magnetic field and/or flux, having a SQUID as magnetic field sensor and a control unit which is connected downstream of the SQUID, has a control time constant (t) and has a feedback loop which acts on the SQUID and is designed such that it is active about a number of operating points of the SQUID, where flux quantum pump means are provided which are assigned to the SQUID, have a signal generation unit for generating a control and/or regulation signal for the SQUID and are designed such that, in order to pump at least one flux quantum into and out of the SQUID, a signal form of the control and/or regulation signal, generated by the signal generation unit, is different and, referred to a rising and a falling edge of a signal form, is unsymmetrical, where in each case only one of the edges of a signal form is short referred to the control time constant.
REFERENCES:
patent: 4672359 (1987-06-01), Silver
patent: 6320369 (2001-11-01), Hidaka et al.
patent: 6337567 (2002-01-01), Lee et al.
C. Ludwig et al., Versatile High Performance Digital SQUID Electronics, IEEE Transactions on Applied Superconductivity, Mar. 2001, pp. 1122-1125, vol. 11, No. 1, Virginia Beach.
Ludwig Christoph
Ludwig Wolfgang
Bachman & LaPointe P.C.
LeDynh Bot
STL Systemtechnik Ludwig GmbH
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