5 May 2005 Nondestructive method to estimate moisture content in single nuts and grain from RF impedance measurements with a parallel-plate sensor
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Abstract
A method to determine the moisture content from the complex impedance measurements of a parallel-plate capacitor with a single shelled or in-shell peanut between the plates, at two frequencies 1 and 5 MHz, is described here. Capacitance (C), phase angle (θ) and dissipation factor (D) of the parallel-plate system at the two frequencies were measured. Using these values in a derived empirical equation, the moisture content (mc) of the peanuts was estimated to an accuracy of within 1% of the standard air-oven value. The moisture range of the peanuts tested was between 5 and 20%. The method is rapid and nondestructive and was found earlier to be applicable in certain types of grain such as corn. The study establishes a basis for the development of a practical instrument that could be useful in the grain and peanut industry.
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C. V.K. Kandala, C. V.K. Kandala, C. L. Butts, C. L. Butts, "Nondestructive method to estimate moisture content in single nuts and grain from RF impedance measurements with a parallel-plate sensor", Proc. SPIE 5762, Smart Structures and Materials 2005: Industrial and Commercial Applications of Smart Structures Technologies, (5 May 2005); doi: 10.1117/12.598439; https://doi.org/10.1117/12.598439
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