Microwave technique for single kernel, seed, nut, or fruit moist

Details Microwave technique for single kernel, seed, nut, or fruit moist Microwave technique for single kernel, seed, nut, or fruit moist

1990-06-01

1991-08-13

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324636, G01N 2204

Patent

active

050399470

ABSTRACT:
A process for nondestructively determining the moisture content of single articles such as single grain kernels, seeds, nuts, fruits, or other biological or agricultural products. The article is inserted into a microwave resonant cavity coupled to a microwave radiation source and a measuring circuit. Measurements of the energy dissipated in the sample and the shift in frequency (or wavelength) due to the presence of the article in the cavity are made at each of two orientations differing by about 90 degrees with respect to the maximum electric field vector. The moisture content is subsequently determined from the ratio of the averaged values of the energy dissipated to the shift in frequency. The process is particularly useful for determining the moisture content of articles of irregular or variable shape.

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A. W. Kraszewski et al., IEEE Transactions on Instrumentation and Measurement, vol. 38, No. 1, pp. 79-84, Feb. 1989.
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