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Agricultural Applications for Dielectric Spectroscopy

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

Citation:  Paper number  033139,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14075) @2003
Authors:   Stuart O. Nelson
Keywords:   Dielectric spectroscopy, Dielectric properties, Permittivity, Wheat, Rice weevil, Fruits, Vegetables

A brief review is presented of dielectric spectroscopy applications in agriculture. Included are wide frequency range (250 Hz to 12 GHz) permittivity, or dielectric properties, measurements on adult rice weevils and hard red winter wheat, for the purpose of assessing selective dielectric heating of the insects, and broadband (200 MHz to 20 GHz) permittivity measurements on tissues of several fresh fruits and vegetables. Similar measurements are shown for tree-ripened peaches, which were obtained to assess possibilities for a permittivity-based maturity index. Broadband (10 MHz to 1.8 GHz) permittivity measurements are shown for several fruits and vegetables as a function of temperature from 5 to 95 C. Measurements over the same frequency range and similar temperature range are presented for two other food products, whey protein gel and apple juice. A few comments are offered on likely future dielectric spectroscopy applications in agriculture.

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