Radiofrequency Sensing of Moisture Content in Cereal Grains

Experimental determination of the dielectric constant of wheat grain and cluster straw in different moisture contents

“…Many commercial instruments have been developed for measuring grain and seed moisture content. Up to 80 years ago, the grain moisture content meter was often used at 1-20 MHz frequencies by parallel plate capacitive or coaxial sample holder where grain samples were placed between the electrodes (Lawrence & Nelson, 1998;Nelson, 1965). Trabelsi, Nelson, and Lewis (2009) measured the dielectric properties of shelled peanuts to estimate its moisture content.…”