Superconducting quantum interference magnetometer having a plura

Details Superconducting quantum interference magnetometer having a plura Superconducting quantum interference magnetometer having a plura

1990-12-26

1992-10-13

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 33035

Patent

active

051554348

ABSTRACT:
A plurality of superconducting quantum interference magnetometers are provided corresponding to a plurality of channels. Each of the superconducting quantum interference magnetometers is accommodated in a cooling vessel and has a superconducting detection loop for interlinking with the unknown magnetic flux. A superconducting magnetic sensor is magnetically coupled to the superconducting detection loop for producing an output voltage pulse. A feedback circuit, supplied with the output voltage pulse from the superconducting magnetic sensor, produces a magnetic flux that counteracts the unknown magnetic flux in response to each output voltage pulse. A gate circuit is provided between the superconducting magnetic sensor and the feedback means for controlling the supplying of the output voltage pulse from the superconducting magnetic sensor to the feedback circuit. The gate circuit is supplied with a control signal and selectively passes the output voltage pulse in response to a logic level of the control signal. Further, a selection circuit provided in the cooling vessel to selectively provide the control signal to the gate circuit in response to a selection signal.

REFERENCES:
patent: 4489274 (1984-12-01), Berlincourt
patent: 4663590 (1987-05-01), Gershenson et al.

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