Coaxial Probe for Dielectric Measurements of Aerated Pulverized Materials

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Knowledge about the dielectric properties of materials, i.e., the relative permittivity and the conductivity, is important for various sensing applications and engineering. In pneumatic conveying systems, the dielectric properties of the transported good are affected by the transport gas, which aerates the pulverized material, effectively decreasing the permittivity. Traditional probe designs such as the open-ended coaxial probe are well suited for the dielectric characteristics of liquids, gels, and pulverized materials. However, to measure the dielectric properties for aerated materials, the probe has to provide measures to create an aerated state. In this paper, we present a probe design to measure the dielectric properties of aerated pulverized materials. The probe maintains a coaxial design with a dedicated gas injection, enabling the analysis of diluted materials. We discuss the design of the probe, show the modeling of the probe, and present suitable calibration techniques. Furthermore, we analyze the uncertainty of the probe design by means of a statistical analysis of the calibration approach.

Original languageEnglish
Article number8680048
Pages (from-to)1402-1411
Number of pages10
JournalIEEE Transactions on Instrumentation and Measurement
Issue number5
Early online date2 Apr 2019
Publication statusPublished - May 2019


  • Calibration
  • coaxial probe
  • dielectric material parameters
  • pulverized material
  • uncertainty determination

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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