Abstract
A brief review is presented on the electrical properties of cereal grains and their use in sensing moisture content of grain and seed. The basic principles are described for using radio-frequency (RF) (including high frequencies and microwaves) dielectric properties, or permittivity, of grain for sensing moisture through their correlation with moisture content. The development of density-independent functions of the permittivity is explained. The findings of recent research are summarized, which indicate that reliable density-independent moisture content determinations can be realized by on-line RF measurements. Development of these techniques will provide useful instruments for on-line monitoring of moisture content in flowing grain and other particulate materials to manage moisture content, prevent spoilage in storage and transport, improve processing, and provide information important for yield determinations in precision agriculture applications.
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