Abstract

A low-cost microwave moisture sensor for real-time, nondestructive determination of moisture content in granular and particulate materials has been assembled and tested. Measurement results on wheat and corn are promising and indicate that moisture content can be predicted from complex permittivity measurement with a single calibration equation. The low price and simplicity of use of the proposed sensor will open a new opportunity for widespread integration of microwave sensing technology in numerous industries including food and agriculture, pharmaceutical, mining, and construction. The sensor can also be used to determine bulk density from the same set of measurements of the relative complex permittivity (Trabelsi, 1997).

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