Electricity: measuring and testing – Magnetic – Magnetometers
Reexamination Certificate
2008-04-29
2008-04-29
Patidar, Jay M (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetometers
C505S846000
Reexamination Certificate
active
10500950
ABSTRACT:
An instrument for measuring sub-pico Tesla magnetic fields using a superconducting quantum interference device (SQUID) inductively coupled to an unshielded gradiometer includes a filter for filtering magnetically-and electrically coupled radio frequency interference (RFI) away from the SQUID. This RFI is principally coupled to the SQUID via the unshielded gradiometer. The filter circuit includes a resistor-capacitor (RC) combination interconnected to first and second terminals so that it is parallel to both an input coil of the SQUID and the gradiometer. In addition, a shielding enclosure is used to electromagnetically shield the filter circuit from the SQUID, and a method is employed to increase the impedance between the input coil and the SQUID without diminishing the overall sensitivity of the instrument.
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Bakharev Alexander
Polyako Yuri
Tralshawala Nilesh
CardioMag Imaging, Inc.
Katten Muchin & Rosenman LLP
Patidar Jay M
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