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ARS Home » Research » Publications at this Location » Publication #199025


item Nelson, Stuart
item Trabelsi, Samir

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/29/2006
Publication Date: 9/4/2006
Citation: Nelson, S.O., Trabelsi, S. 2006. Dielectric spectroscopy studies on hard red winter wheat[abstract], September 4-7, Poznan,Poland. 4th International Dielectric Society and 9th International Conference on Dielectric and Related Phenommona. pp. 252-253.

Interpretive Summary:

Technical Abstract: The dielectric properties (components of the complex permittivity relative to free space) of ground hard red winter wheat of 11 to 25% moisture content were determined by dielectric spectroscopy measurements with an open ended coaxial line probe and impedance analyzer over the frequency range from 10 MHz to 1.8 GHz at temperatures from 5 to 95 degrees C. Both the dielectric constant and dielectric loss factor, over the stated range of variables, decreased with increasing frequency and increased with increasing moisture content and temperature. Plots of the dielectric constant and loss factor in the complex permittivity plane revealed a linear relationship between the two permittivity components at frequencies above 1 GHz, but they showed nonlinearity at lower frequencies due to the increasing influence of ionic conduction as confirmed by Cole Cole plots of the permittivity data.