Superconducting quantum interference magnotometer having a feedb

Details Superconducting quantum interference magnotometer having a feedb Superconducting quantum interference magnotometer having a feedb

1990-12-26

1992-11-10

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

338325, 505846, G01K 33035

Patent

active

051627310

ABSTRACT:
A superconducting pickup coil is provided for interlinking with an unknown magnetic flux and causing an induction current to flow. A superconducting detector is provided magnetically coupled with the superconducting pickup coil for producing output voltage pulses in response to the unknown magnetic flux. A superconducting feedback circuit is provided connected to the superconducting detector for receiving the output voltage pulses therefrom and feeding back a feedback magnetic flux to the superconducting pickup coil in response to each output voltage pulse such that the feedback magnetic flux counteracts the unknown magnetic flux. A resistance fixture is provided in the vicinity of the superconducting pickup coil for causing a transition in a part of the superconducting pickup coil from a superconducting state to a normal conducting state in response to the drive current. A controller is provided connected to the resistance fixture and the superconducting detector for receiving the output pulses therefrom and producing a drive current for energizing the resistance fixture. Simultaneously with the energization of the resistance fixture, the controller resets the feedback circuit such that the counteracting feedback magnetic flux is deenergized.

REFERENCES:
patent: 3667033 (1972-05-01), Davis
patent: 4489274 (1984-12-01), Berlincourt
patent: 4549135 (1985-10-01), Vaidya
patent: 4663590 (1987-05-01), Gershenson et al.
patent: 4947118 (1990-08-01), Fujimaki

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