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Proceedings Paper

Nondestructive method to estimate moisture content in single nuts and grain from RF impedance measurements with a parallel-plate sensor
Author(s): C. V.K. Kandala; C. L. Butts
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Paper 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.

Paper Details

Date Published: 5 May 2005
PDF: 7 pages
Proc. SPIE 5762, Smart Structures and Materials 2005: Industrial and Commercial Applications of Smart Structures Technologies, (5 May 2005); doi: 10.1117/12.598439
Show Author Affiliations
C. V.K. Kandala, U.S. Dept. of Agriculture (United States)
C. L. Butts, U.S. Dept. of Agriculture (United States)


Published in SPIE Proceedings Vol. 5762:
Smart Structures and Materials 2005: Industrial and Commercial Applications of Smart Structures Technologies
Edward V. White, Editor(s)

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