Superconducting magnetometer having increased bias current toler

Details Superconducting magnetometer having increased bias current toler Superconducting magnetometer having increased bias current toler

1993-09-24

1995-11-14

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 33035

Patent

active

054670152

ABSTRACT:
A superconducting magnetic sensor includes a SQUID for interlinking with an external magnetic flux, an A.C. bias circuit for driving the SQUID with an A.C. bias current having a first frequency, a feedback circuit supplied with output voltage pulses from the SQUID for calculating a difference between the total number of positive output voltage pulses and the total number of negative output voltage pulses and for producing a feedback magnetic flux in response thereto such that the external magnetic flux is canceled out by the feedback magnetic flux, and a modulation current source for supplying a modulation current having a frequency substantially smaller than the frequency of the bias current and for producing a modulation magnetic flux in response to the modulation current such that the modulation magnetic flux interlinks with the SQUID.

REFERENCES:
patent: 4866373 (1989-09-01), Harada et al.
patent: 4947118 (1990-08-01), Fujimaki
patent: 5065096 (1991-11-01), Muck et al.
patent: 5093618 (1992-03-01), Goto et al.
patent: 5155434 (1992-10-01), Fujimaki
patent: 5162731 (1992-11-01), Fujimaki
patent: 5287057 (1994-02-01), Gotoh
patent: 5287058 (1994-02-01), Goto et al.
Fujimaki et al., "Thermal noise-limied sensitivity of the pulse-biased SQUID magnetometer," Journal of Applied Physics, vol. 65, No. 4, Feb. 1989, New York, US, pp. 1626-1630.
Fujimaki, "Josephson Integrated Circuits III--A Single-Chip SQUID Magnetometer", Fujitsu Scientific & Technical Journal, vol. 27, No. 1, 1991, Kawasaki, JP, pp. 59-83.
Goto et al., "Multi-Channel SQUID Magnetic Meter," English language abstract of Japanese Laid-Open Patent Publication 4-204278, Jul. 24, 1992 (Appln. No. 2-336401 filed Nov. 30, 1990).
Fujimaki et al., "A Single-Chip SQUID magnetometer," IEEE Transactions on Electron Devices, vol. 35, No. 12, Dec. 1988, pp. 2412-2417.

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