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Techniques for Measuring the Dielectric Properties of Agricultural Products

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121338238.(doi:10.13031/2013.41890)
Authors:   Stuart O Nelson, Samir Trabelsi
Keywords:   Dielectric properties, permittivity, dielectric constant, dielectric loss factor, measurement methods, audio frequencies, radio frequencies, microwaves

Dielectrics and dielectric properties of materials are defined generally, and methods for measuring dielectric properties of agricultural products are described for several frequency ranges from audio frequencies through microwave frequencies. These include measurement with impedance and admittance bridges, resonant circuits, and transmission-line and free-space methods in the frequency domain and time-domain and broadband techniques. Many references are cited that describe the methods in detail and provide data on the dielectric properties or permittivities of agricultural products.

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