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Compact fluxgate magnetic full-tensor gradiometer with spherical feedback coil.

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A novel magnetic full-tensor gradiometer uses four fluxgates and a spherical feedback coil for enhanced accuracy and stability. This compact design is ideal for space-constrained platforms, demonstrating effective magnetic field characterization.

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Area of Science:

  • Geophysics
  • Instrumentation
  • Magnetic field measurement

Background:

  • Magnetic tensor gradiometers are crucial for characterizing magnetic fields.
  • Existing designs can suffer from crosstalk and orientation errors.

Purpose of the Study:

  • To describe the construction of a novel magnetic full-tensor gradiometer.
  • To enhance accuracy, stability, and reduce errors in magnetic field measurements.

Main Methods:

  • Utilized four fluxgates on a planar cross structure with a single triaxial spherical feedback coil.
  • Employed a reference fluxgate to control feedback coil currents.
  • Operated fluxgates in a near-zero magnetic field environment.

Main Results:

  • Achieved a measured gradient tensor magnitude of 0.52 nT/m/Hz(1/2) @ 1 Hz in unshielded conditions.
  • Demonstrated improved stability, accuracy, and reduced crosstalk and orientation errors.
  • Successfully verified functionality by locating a small dipole magnet.

Conclusions:

  • The developed magnetic full-tensor gradiometer offers high performance and stability.
  • Its compact, global feedback design makes it suitable for space-constrained moving platforms.
  • This instrument advances magnetic field characterization capabilities.