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US Patent 5367259 - Active shielding device based on SQUID and feedback therefrom for the reduction of environmental magnetic noise

US Patent Issued on November 22, 1994
Estimated Patent Expiration Date: Icon_subject May 12, 2012Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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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.

Inventors

Assignee

Application

No. 881795 filed on 05/12/1992

US Classes:

324/248, Superconductive magnetometers505/846Using superconductive quantum interference device (i.e., SQUID): (Class 324/248)

Field of Search

324/248, Superconductive magnetometers505/845, Magnetometer: (Class 324/248)505/846Using superconductive quantum interference device (i.e., SQUID): (Class 324/248)

Examiners

Primary: Snow, Walter E.

Attorney, Agent or Firm

US Patent References

4327498, Magnetic compass compensation system
Issued on: 05/04/1982
Inventor: Setter ,   et al.
4663590, Single frequency noise reduction circuit for squids
Issued on: 05/05/1987
Inventor: Gershenson ,   et al.
5248941Superconducting magnetic field sensing apparatus having digital output, on-chip quantum flux packet feedback and high bias margins
Issued on: 09/28/1993
Inventor: Lee, et al.

International Class

G01R 033/035

Foreign Application Priority Data

1991-05-13 JP

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