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Measurement of Dielectric Properties of Cereal Grains by Nondestructive Microwave Measurement Technique  

Kim, Ki-Bok (Center for Safety Measurement, Korea Research Institute of Standards and Science)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.22, no.4, 2002 , pp. 369-376 More about this Journal
Abstract
The dielectric properties of cereal grains such as short-grain rough rice, brown rice and barley with various moisture contents were determined by measuring the attenuation and phase shift of the microwave signal trough the grain samples at 9.5GHz. The microwave free-space transmission measurement system consisted of sample holder, horn antenna and network analyzer. Dielectric constant and loss factor of grain samples increased with moisture content and bulk density and agreed well with previous research results. Moisture density, which is defined as the product of moisture content and bulk density, was proposed as a bulk density and variety compensation factor. The technique for measurement of dielectric properties based on free-space transmission may be useful for other particulate materials.
Keywords
microwave; free-space transmission; dielectric constant; dielectric loss factor; bio-resources; cereal grains;
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