Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1988-02-08
1990-03-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, 324 96, 455606, G01R 33035
Patent
active
049069306
ABSTRACT:
A SQUID for detecting a weak magnetic field is constructed of a sensor coil which detects a signal magnetic flux, and a superconducting loop which is magnetically coupled with the sensor coil to generate a periodic voltage corresponding to an interlinking magnetic flux from the sensor coil. The periodic voltage from the SQUID is amplified, and is taken out. The periodic voltage taken out is synchronously detected by a phase-sensitive detecting amplifier. The synchronously-detected signal is converted into a light signal, which is fed back to the SQUID. The light signal fed back is converted into an electric signal by a superconducting phototransistor which is arranged in a cryogenic atmosphere. A magnetic flux corresponding to the electric signal from the superconducting phototransistor is fed back to the superconducting loop by a feedback coil.
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Hasegawa Haruhiro
Nakane Hideaki
Nishino Toshikazu
Edmonds Warren S.
Hitachi , Ltd.
Strecker Gerard R.
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