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Related Experiment Videos

A planar second-order DC SQUID gradiometer.

P Carelli1, L Chiaventi, R Leoni

  • 1Universita di L'Aquila, Dipartimento di Energetica, Italy.

Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
|January 1, 1991
PubMed
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This study presents a novel DC SQUID gradiometer, a device measuring the magnetic field

Area of Science:

  • Superconducting quantum interference devices (SQUIDs)
  • Magnetometry
  • Gradiometry

Background:

  • Traditional magnetic field sensors face limitations in spatial resolution and noise rejection.
  • Second-order gradiometers offer enhanced performance for specific applications.
  • DC SQUIDs are highly sensitive magnetic flux detectors.

Purpose of the Study:

  • To develop and characterize a novel DC SQUID gradiometer sensitive to the second spatial derivative of the magnetic field.
  • To evaluate the localization capabilities and noise rejection properties of the developed gradiometer.
  • To report preliminary fabrication results and potential improvements.

Main Methods:

  • Fabrication of a second-order gradiometer using Nb-NbO(x)-PbAuIn Josephson tunnel junctions.

Related Experiment Videos

  • Magnetic measurements using an array of DC SQUID gradiometers.
  • Characterization of the gradiometer's sensitivity and spatial resolution.

    • Main Results:

    • The DC SQUID gradiometer demonstrates sensitivity to the second spatial derivative of the magnetic field.
    • Localization capability is comparable to axial detector arrays, with improved resolution for near sources.
    • Achieved magnetic field sensitivity of approximately 2 fT Hz(-1/2) with a target inductance of a few hundred pH.

    Conclusions:

    • The developed DC SQUID gradiometer shows promise for advanced magnetic field sensing applications.
    • Planar gradiometers offer advantages in near-source resolution and far-disturbance rejection.
    • Further improvements in fabrication and design are expected to enhance performance.