Reflected impedanceometry: a contact-free technique for measuring induced magnetic hysteresis and eddy current heating

Research output: Contribution to journalArticlepeer-review

Abstract

Reflected Impedanceometry is a new technique that can remotely measure the power absorbed during radiofrequency induction heating. It measures the total system impedance from the phase difference between current and voltage in the electromagnetic field work coil and uses the characteristic impedance of the work coil circuit to infer the heating power transferred into a susceptor bed. Induction heating of susceptor materials within alternating magnetic fields occurs by magnetic hysteresis, eddy currents, Néel relaxation or Brownian relaxation. It shows potential for replacing fossil fuels with renewable electricity in carbon-intensive industrial applications but requires advances in measurement techniques. Previously developed methods for measuring heating power, such as pick-up coils, are limited to applications involving magnetic materials. Results presented here show that reflected impedanceometry accurately measures heating power for both magnetic hysteresis and eddy currents, fulfilling the requirement for measuring induction heating power.

Original languageEnglish
Article number095002
JournalJournal of Physics Communications
Volume6
Issue number9
Early online date2 Sep 2022
DOIs
Publication statusPublished - 30 Sep 2022

Keywords

  • eddy current
  • electromagnetism
  • induction heating
  • magnetic hysteresis
  • reflective impedanceometry
  • RF heating

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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