Open-ended coaxial-line permittivity measurements on pulverized materials

The open-ended, coaxial-line probe technique can be used to obtain estimates of the permittivities of some solid dielectrics over broad ranges of frequency by measurements on powdered or pulverized samples, but certain limitations must be recognized. Such a probe was used with a network analyzer to...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1998-02, Vol.47 (1), p.133-137
Main Authors: Nelson, Stuart O, Bartley, Philip G. Jr
Format: Article
Language:English
Subjects:
bulk density
coal
Coaxial components
Density measurement
Dielectric materials
Dielectric measurements
dielectric properties
equations
Frequency estimation
Frequency measurement
limestone
measurement
microwave radiation
particulates
Permittivity measurement
Probes
probes (equipment)
Reflection
Solids
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Summary:The open-ended, coaxial-line probe technique can be used to obtain estimates of the permittivities of some solid dielectrics over broad ranges of frequency by measurements on powdered or pulverized samples, but certain limitations must be recognized. Such a probe was used with a network analyzer to estimate the permittivities of coal and limestone from reflection coefficients measured on pulverized samples. The bulk density of the pulverized samples for the coaxial probe measurements was determined from auxiliary, single-frequency permittivity measurements on the samples at known bulk densities, and the permittivities of the solid materials over the frequency range from 0.2 GHz to 20 GHz were then estimated by computations based on the Landau and Lifshitz, Looyenga dielectric mixture equation and solid material densities.
ISSN:0018-9456
1557-9662
DOI:10.1109/19.728805