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Calibration of Magnetic Field Probes At Relevant Magnitudes
19th IEEE Pulsed Power Conference
  • R. A. Pahl
  • Joshua L. Rovey, Missouri University of Science and Technology
  • David Pommerenke, Missouri University of Science and Technology
Abstract
Difficulty driving large currents through an inductive load at high frequency typically results in field magnitudes of a few microTesla or less. The calibration factor is then necessarily assumed linear, even though the magnetic field of the primary experiment is several orders of magnitude larger than the field magnitude used to calibrate the probe. In this work calibration factors of two differential configuration magnetic field probes are presented as functions of frequency and field magnitude. Calibration factors are determined experimentally using a 80.4 mm radius Helmholtz coil in two separate configurations. A conventional low-magnitude calibration using a network analyzer with field magnitude of 158 nT yielded calibration factors of 15,107±233 and 4,899±180 T/V-s at 457 kHz for the surface mounted inductor and hand-wound probe, respectively. A relevant-magnitude calibration using a pulsed-power setup with field magnitude of 43.5 to 83.0 mT yielded calibration factors of 14,541±41.8 and 4,484±15.8 T/V-s at 457 kHz for the surface mounted inductor and hand-wound probe, respectively. The uncertainty reported is one standard deviation of the repeated calibration measurement. Low-magnitude calibration always resulted in a larger calibration factor, with a maximum difference of 18.5%. Comparison of the pulsed-power Helmholtz coil current waveform with the magnetic field waveform measured with the magnetic probes showed differences of 1.4% and 0.7% in the waveform extrema at 457 kHz for the surface mounted inductor and hand-wound probe, respectively.
Meeting Name
19th IEEE Pulsed Power Conference
Department(s)
Mechanical and Aerospace Engineering
Second Department
Electrical and Computer Engineering
Keywords and Phrases
  • Calibration,
  • Coils,
  • Inductors,
  • Magnetic Field Field Measurement,
  • Magnetic Sensors,
  • Probes
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2013 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
1-1-2013
Citation Information
R. A. Pahl, Joshua L. Rovey and David Pommerenke. "Calibration of Magnetic Field Probes At Relevant Magnitudes" 19th IEEE Pulsed Power Conference (2013)
Available at: http://works.bepress.com/david-pommerenke/51/