Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1996-04-19
1998-10-20
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324241, 324258, 505846, G01R 33035, G01R 3302, G01N 2772
Patent
active
058251839
ABSTRACT:
A superconducting loop is formed by two Josephson junctions connected to both ends of a washer coil which serves also as a pick-up coil. The washer coil which is a magnetic field detection portion is constituted by two coils, i.e., a coil having a radius r.sub.1 and a number of turns n.sub.1 and a coil having a radius r.sub.2 and a number of turns n.sub.2 which are in the form of concentric circular loops. The two coils are coupled in opposite directions and are designed so that effective areas n.sub.1 .pi.r.sub.1.sup.2 and n.sub.2 .pi.r.sub.2.sup.2 are equal to each other. Since a magnetic field is directly detected by the washer coil, sensitivity to a magnetic field is enhanced. This makes it possible to obtain sufficient sensitivity to a magnetic field even if the area of the magnetic field detection portion is reduced to improve spatial resolution. It is, therefore, possible to realize a radial differential SQUID magnetic flux meter which has good spatial resolution and coil balance and which is suitable for mass production.
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Chinone Kazuo
Morooka Toshimitsu
Shimizu Nobuhiro
Seiko Instruments Inc.
Strecker Gerard R.
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