Click on “Download PDF” for the PDF version or on the title for the HTML version.


If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Phase angle and Impedance Measurements for Nondestructive Moisture Content Determination of In-Shell Peanuts Using a Cylindrical Sample Holder.

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

Citation:  2007 ASAE Annual Meeting  076215.(doi:10.13031/2013.23527)
Authors:   Chari V Kandala, Chris L Butts
Keywords:   Keywords: Parallel-plate, Impedance, Peanut pods, Phase angle, Capacitance

Two parallel-plate electrodes were mounted inside a cylinder, made of a non-conducting material. The space between the plates was filled with peanut pods and the capacitance and phase angle of this system was measured with a prototype low-cost impedance meter, designed for this purpose. Measurements were made at frequencies of 1 and 5 MHz on peanut pod (in-shell) samples of known moisture content between 7 and 17% (wet basis). Using these measured values an empirical equation was developed from which the average moisture content of a peanut pod sample could be calculated from its impedance values. The calculated moisture content values were compared with their air-oven values and were found to be within 1% of the air-oven values for over 95% of the samples tested. The size of the sample used was about 100 g and no shelling or cleaning of the sample was involved. This method is rapid and nondestructive.

(Download PDF)    (Export to EndNotes)