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High Tc SQUID Circuits Suppress Intrinsic Magnetic Field Noise

IB-1221

Ernest Orlando Lawrence Berkeley National Laboratory

APPLICATIONS OF TECHNOLOGY:
  • Medical imaging
    • Magnetocardiography
    • Magnetoencephalography
  • Geophysical studies
    • Magnetotellurics
    • Controlled-source electromagnet

ADVANTAGES:

ABSTRACT: John Clarke and colleagues at Berkeley Lab have eliminated excess low frequency noise in high-transition temperature (Tc) superconducting quantum interference devices (SQUIDs) and SQUID-based magnetometers operating in ambient magnetic fields. Using SQUIDs fabricated with precise slots and holes, researchers have reduced the problem of intrinsic magnetic noise, previously a major impediment to the application of high-Tc SQUIDs in the earth's magnetic field, to an artifact of design. This new innovation improves operation of both single-layer and superconducting multilayer SQUID devices, with the low noise, multilayer magnetometer offering the highest sensitivity for a given size. This invention is an essential ingredient for operation of SQUID-based devices in medical applications, such as magnetocardiography and magnetoencephalography. It obviates the need for expensive, magnetically shielded rooms. Other applications include geophysical studies, for example, magnetotellurics (MT) and controlled-source electromagnetics (CSEM), in which it is essential to operate the magnetometers in an unshielded environment.

STATUS: U.S. Patent #6,023,161. Available for licensing

FOR MORE INFORMATION PLEASE SEE:

REFERENCE NUMBER: IB-1221

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