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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:
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.
Estimated Patent Expiration Date:
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.AbstractA 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. | InventorsAssigneeApplicationNo. 881795 filed on 05/12/1992US Classes:324/248, Superconductive magnetometers505/846Using superconductive quantum interference device (i.e., SQUID): (Class 324/248)Field of Search324/248, Superconductive magnetometers505/845, Magnetometer: (Class 324/248)505/846Using superconductive quantum interference device (i.e., SQUID): (Class 324/248)ExaminersPrimary: Snow, Walter E.Attorney, Agent or FirmUS Patent References4327498, Magnetic compass compensation systemIssued 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 ClassG01R 033/035Foreign Application Priority Data1991-05-13 JP |
