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Dielectric Properties of Agricultural Products

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Encyclopedia of Agrophysics

Synonyms

Electric permittivity

Definition

Dielectric properties. Those characteristics of poorly conducting materials that determine their interaction with electric fields.

Introduction

Dielectrics are a class of materials that are poor conductors of electricity, in contrast to materials such as metals that are generally good electrical conductors. Many materials, including living organisms and most agricultural products, conduct electric currents to some degree, but are still classified as dielectrics. The electrical nature of these materials can be described by their dielectric properties, which influence the distribution of electromagnetic fields and currents in the region occupied by the materials, and which determine the behavior of the materials in electric fields. Thus, the dielectric properties determine how rapidly a material will warm up in radio frequency or microwave dielectric heating applications. Their influence on electric fields also provides a means for sensing...

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Bibliography

  • ASAE, 2000. ASAE D293.2 Dielectric properties of grain and seed, ASAE Standards 2000. St. Joseph: American Society of Agricultural Engineers, pp. 549–558.

    Google Scholar 

  • Guo, W., Nelson, S. O., Trabelsi, S., and Kays, S. J., 2007a. 10–1800-MHz dielectric properties of fresh apples during storage. Journal of Food Engineering, 83, 562–569.

    CAS  Google Scholar 

  • Guo, W., Trabelsi, S., Nelson, S. O., and Jones, D. R., 2007b. Storage effects on dielectric properties of eggs from 10 to 1800 MHz. Journal of Food Science, 72(5), E335–E340.

    CAS  PubMed  Google Scholar 

  • Hasted, J. B., 1973. Aqueous Dielectrics. London: Chapman and Hall.

    Google Scholar 

  • Knipper, N. V., 1959. Use of high-frequency currents for grain drying. Journal of Agricultural Engineering Research, 4(4), 349–360.

    Google Scholar 

  • Kraszewski, A. W., and Nelson, S. O., 1989. Composite model of the complex permittivity of cereal grain. Journal of Agricultural Engineering Research, 43, 211–219.

    Google Scholar 

  • Nelson, S. O., 1965. Dielectric properties of grain and seed in the 1 to 50-mc range. Transactions of the ASAE, 8, 38–48.

    Google Scholar 

  • Nelson, S. O., 1980. Microwave dielectric properties of fresh fruits and vegetables. Transactions of the ASAE, 23, 1314–1317.

    Google Scholar 

  • Nelson, S. O., 1983. Dielectric properties of some fresh fruits and vegetables at frequencies of 2.45 to 22 GHz. Transactions of the ASAE, 26, 613–616.

    Google Scholar 

  • Nelson, S. O., 1987. Models for the dielectric constants of cereal grains and soybeans. The Journal of Microwave Power and Electromagnetic Energy, 22, 35–39.

    Google Scholar 

  • Nelson, S. O., 1992. Microwave dielectric properties of fresh onions. Transactions of the ASAE, 35, 963–966.

    Google Scholar 

  • Nelson, S. O., 1996. Review and assessment of radio-frequency and microwave energy for stored-grain insect control. Transactions of the ASAE, 39, 1475–1484.

    Google Scholar 

  • Nelson, S. O., 2003. Frequency- and temperature-dependent permittivities of fresh fruits and vegetables from 0.0l to 1.8 GHz. Transactions of the ASAE, 46, 567–574.

    Google Scholar 

  • Nelson, S. O., 2005. Dielectric spectroscopy of fresh fruit and vegetable tissues from 10 to 1800 MHz. The Journal of Microwave Power and Electromagnetic Energy, 40, 31–47.

    PubMed  Google Scholar 

  • Nelson, S. O., 2006. Agricultural applications of dielectric measurements. IEEE Transactions on Dielectrics and Electrical Insulation, 13, 688–702.

    Google Scholar 

  • Nelson, S. O., and Bartley, P. G. Jr., 2002. Frequency and temperature dependence of the dielectric properties of food materials. Transactions of the ASAE, 45, 1223–1227.

    Google Scholar 

  • Nelson, S. O., and Trabelsi, S., 2006. Dielectric spectroscopy of wheat from 10 MHz to 1.8 GHz. Measurement Science and Technology, 17, 2294–2298.

    CAS  Google Scholar 

  • Nelson, S. O., and Whitney, W. K., 1960. Radio-frequency electric fields for stored-grain insect control. Transactions of the ASAE, 3, 133–137.

    Google Scholar 

  • Nelson, S. O., Soderholm, L. H., and Yung, F. D., 1953. Determining the dielectric properties of grain. Agricultural Engineering, 34, 608–610.

    Google Scholar 

  • Nelson, S. O., Forbus, W. R. Jr., and Lawrence, K. C., 1994. Permittivities of fresh fruits and vegetables at 0.2 to 20 GHz. The Journal of Microwave Power and Electromagnetic Energy, 29, 81–93.

    CAS  PubMed  Google Scholar 

  • Nelson, S. O., Forbus, W. R. Jr., and Lawrence, K. C., 1995. Assessment of microwave permittivity for sensing peach maturity. Transactions of the ASAE, 38, 579–585.

    Google Scholar 

  • Nelson, S. O., Trabelsi, S., and Kays, S. J., 2006. Dielectric spectroscopy of honeydew melons from 10 MHz to 1.8 GHz for quality sensing. Transactions of the ASABE, 49, 1977–1981.

    Google Scholar 

  • Nelson, S. O., Guo, W., Trabelsi, S., and Kays, S. J., 2007. Dielectric spectroscopy of watermelons for quality sensing. Measurement Science and Technology, 18, 1887–1892.

    CAS  Google Scholar 

  • Trabelsi, S., Kraszewski, A., and Nelson, S. O., 1998. New density-independent calibration function for microwave sensing of moisture content in particulate materials. IEEE Transactions on Instrumentation and Measurement, 47, 613–622.

    Google Scholar 

  • Zhuang, H., Nelson, S. O., Trabelsi, S., and Savage, E. M., 2007. Dielectric properties of uncooked chicken breast muscles from ten to one thousand eight hundred megahertz. Poultry Science, 86, 2433–2440.

    CAS  PubMed  Google Scholar 

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Correspondence to Stuart O. Nelson .

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Nelson, S.O., Trabelsi, S. (2011). Dielectric Properties of Agricultural Products. In: Gliński, J., Horabik, J., Lipiec, J. (eds) Encyclopedia of Agrophysics. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3585-1_208

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