DocumentCode :
1546539
Title :
Measurement and calculation of powdered mixture permittivities
Author :
Nelson, Stuart O.
Author_Institution :
Richard B. Russell Agric. Res. Center, U.S. Dept. of Agric., Athens, GA, USA
Volume :
50
Issue :
5
fYear :
2001
fDate :
10/1/2001 12:00:00 AM
Firstpage :
1066
Lastpage :
1070
Abstract :
The permittivities of pulverized samples of coal and limestone were measured over a range of bulk densities at 11.7 GHz and 20°C. The measured values were used, along with particle densities, determined by pycnometer measurements, and the Landau & Lifshitz, Looyenga (LLL) dielectric mixture equation to determine the solid material permittivities. Subsequently, similar measurements were taken on a 35%-65% coal-limestone mixture, and the LLL equation and the complex refractive index (CRI) dielectric mixture equation were used to calculate the permittivities of powdered coal, limestone, and the 35%-65% mixture at various bulk densities. Results compared to the measured permittivities showed that the LLL equation provided much better estimates than the CRI equation, with errors of 0.15% in predicting the dielectric constants of powdered coal, 1.4% in predicting the dielectric constants of powdered limestone, and 0.5% in predicting the dielectric constants of the coal-limestone mixture
Keywords :
coal; density measurement; microwave measurement; mixtures; permittivity; permittivity measurement; powders; pulverised fuels; 11.7 GHz; 20 C; 20°C; coal-limestone mixture; complex refractive index; dielectric mixture equation; limestone; permittivity measurements; powdered coal; pycnometer measurements; solid material permittivities; Density measurement; Dielectric constant; Dielectric loss measurement; Dielectric materials; Dielectric measurements; Equations; Microwave measurements; Particle measurements; Permittivity measurement; Solids;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/19.963159
Filename :
963159
Link To Document :
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