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Broad-band magnetic induction probe calibration using a frequency-corrected reference probe.

Carrie Hill1

  • 1ERC Inc., 1 Ara Rd., Edwards Air Force Base, California 93524, USA.

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This summary is machine-generated.

A new in situ calibration method accurately measures magnetic fields by correcting for probe impedance effects at a single frequency. This technique enhances broad-band magnetic field measurement accuracy, overcoming traditional calibration limitations.

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Area of Science:

  • Electromagnetics and Measurement Science
  • Instrumentation and Calibration Techniques

Background:

  • Finite impedances in magnetic induction probes cause frequency-dependent signal attenuation and phase shifts.
  • Traditional calibration methods require sweeping magnetic field sources across a frequency range, which is not always feasible.

Purpose of the Study:

  • To develop a novel in situ calibration technique for magnetic induction probes.
  • To enable accurate broad-band magnetic field measurements when conventional methods are impractical.

Main Methods:

  • In situ calibration at a single frequency using a reference probe with known characteristics.
  • Utilizing broad-band impedance measurements within a transfer function to correct for frequency-dependent effects.
  • Employing circuit modeling to analyze and correct for capacitive coupling between probes and the source coil.

Main Results:

  • The new method effectively accounts for impedance effects across a broad frequency range.
  • Capacitive coupling was modeled, showing negligible attenuation and a small phase delay.
  • Relative phase delays were corrected by time-shifting probe signals.

Conclusions:

  • The presented in situ calibration method extends single-frequency techniques to broad-band applications.
  • This approach improves the accuracy of magnetic field measurements by addressing non-ideal probe behaviors.
  • The technique offers a viable alternative for probe calibration in geometrically or hardware-constrained scenarios.