Active shielding device based on SQUID and feedback therefrom fo

Details Active shielding device based on SQUID and feedback therefrom fo Active shielding device based on SQUID and feedback therefrom fo

1992-05-12

1994-11-22

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

505846, G01R 33035

Patent

active

053672593

ABSTRACT:
A magnetic noise reducing device can effectively produce a practically noiseless space that can reduce environmental magnetic noise harmful for measuring biomagnetism with a high magnetism damping factor in low frequency range. The magnetic noise reducing device comprises a SQUID flux meter 1 and a pair of noise canceling coils 2 as minimum components, the feedback current I produced by the SQUID flux meter 1 being supplied to the noise canceling coils 2, the magnetic flux detecting coil of the SQUID flux meter being arranged within a specific central space 4 defined by the noise canceling coils 2 for effective reduction of magnetic noise within that space.

REFERENCES:
patent: 4327498 (1982-05-01), Setter et al.
patent: 4663590 (1987-05-01), Gershenson et al.
patent: 5248941 (1993-09-01), Lee et al.

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