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Nondestructive Multiparameter Microwave Sensor

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

Citation:  Paper number  036129,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15412)
Authors:   Samir Trabelsi, Stuart O. Nelson
Keywords:   Multiparameter sensor, Microwaves, Free space, Attenuation, Phase shift, Dielectric properties, Granular materials, Bulk density, Moisture content, Wheat, Corn, Soybeans

The principles of a nondestructive multiparameter microwave sensor operating at a single frequency are presented. Three methods of calibration are investigated for simultaneous, independent determination of bulk density and moisture content in moist granular materials. The first calibration method is based on measured attenuation and phase shift through a layer of material in free space. The second and the third calibration methods are pemittivitybased and thus can be used regardless of the measurement technique. Performance of these calibration methods is tested for wheat, corn and soybeans at 10.0 GHz at room temperature.

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