Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1993-02-02
1996-07-02
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, 327527, G01R 3302, G01R 33035
Patent
active
055325920
ABSTRACT:
SQUID control apparatus for controlling multiple SQUID probes includes a plurality of head units each corresponding to a respective SQUID probe, each of the head units including a non-cryogenic modulated flux-locked loop feedback circuit operating at a respective modulation frequency. The apparatus also includes a base unit coupled to all of the head units, the base unit providing control signals to control the multiple head units. Means are also provided, such as through the use of a daisy chain topology, for synchronizing the modulation frequency of all of the modulated flux-locked loop feedback circuits. The head units may also contain a phase shifter coupled to phase shift the modulation frequency oscillator signal for provision to the local oscillator input of a demodulator, and the phase shifter may include a shifting filter for filtering the oscillator signal to reduce all frequency components except a fundamental frequency component, and for phase shifting the fundamental frequency component by a desired amount, and shaping means for shaping the filtered and shifted signal into a square wave.
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Conductus, Inc.
O'Shea Sandra L.
Patidar Jay M.
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