Performance of a double dc SQUID magnetometer

Conference · Fri Mar 01 04:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5923902

Casas, J; Miyoamoto, N; Nakane, H; Goto, E ^[1]

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1. Research Development Corp. of Japan, I-280 Higashi Koigakubo, Kokubunji, Tokyo 185 (JP)

This paper presents a magnetic flux sensing device that is made by using two dc Squids. The dc Squids are of similar characteristics, magnetically coupled by a common coil and are turned into the voltage state by a single dc current source. As the dc Squids are magnetically coupled, the magnetic flux noise generated by one of the dc Squids is sensed by the other one and vice versa. Then by making a differential measurement across both dc Squids, the magnetic flux noise detected by the dc Squids can be added either constructively or destructively. This means the magnetic flux noise cancellation is possible as it is demonstrated experimentally. The double dc Squid configuration can also be used in the add flux noise mode, case in which there is no loss of performance when comparing with what is possible to obtain with a single dc Squid.

• OSTI ID: 5923902
• Report Number(s): CONF-900944--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
CRITICAL CURRENT
CURRENTS
DEMONSTRATION PROGRAMS
DESIGN
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUX QUANTIZATION
FLUXMETERS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROELECTRONICS
MICROWAVE EQUIPMENT
PERFORMANCE
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS