Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1988-02-12
1988-10-11
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetometers
361 19, G01R 33035
Patent
active
047774371
ABSTRACT:
In a monitoring system for detecting a quench in a superconductive coil to which AC power is supplied, a switch apparatus is connected between the coil and a A.C. power source. A voltage between a top of the coil and a dividing resistor connected in parallel with the coil is detected and converted into a voltage signal by a insulation amplifier and a current flowing through the coil 1 is detected by a current detector and is converted into a current signal by an amplifier. The voltage signal is detected with the current signal as a reference signal by a phase detector so that a signal component of the voltage signal in phase with the reference signal is outputted from the phase detector. The signal component is averaged in a averaging circuit, when the voltage signal is out-of-phase with the reference signal, an output signal is generated as an alarm signal from the averaging circuit.
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Shimamoto et al, "An 8.5T-24 cm Bore Nb-Ti Magnet for a Short Sample Test on a Tokamak Superconductor", Cryogenics, vol. 19, No. 8, Aug. 1979, pp. 491-492.
Ito Daisuke
Matsukura Kunio
Morohoshi Mituyoshi
Tashiro Ikuo
Edmonds Warren S.
Eisenzopf Reinhard J.
Kabushiki Kaisha Toshiba
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