Nondestructive moisture determination in small samples of popcorn by RF impedance measurement
1994
Kandala, C.V.K. | Nelson, S.O. | Lawrence, K.C.
An empirical equation was developed earlier for predicting the moisture contents of single kernels of popcorn from radio-frequency (RF) measurements. This equation, with slight modifications, has been used successfully for predicting moisture contents of small quantities (about 15 to 30 kernels) of popcorn. Measurements of capacitance, dissipation factor and/or phase angle were taken with an impedance analyzer at 1 and 4.5 MHz on a parallel-plate capacitor holding small numbers of kernels between the plates. Sample moisture contents were predicted within 1% moisture content of bulk-sample oven moisture content determinations for 89% of the popcorn samples rested in the moisture range from 11 to 25%, wet basis.
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