한국농업기계학회:학술대회논문집 (Proceedings of the Korean Society for Agricultural Machinery Conference)
- 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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- Pages.293-304
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- 1996
Dielectric Properties of Agricultural Properties and Their Use in Moisture Sensing and Other Applications
- Nelson, Stuart O. (U.S. Department of Agriculture Agricultural Research Service)
- 발행 : 1996.06.01
초록
Historical interest in dielectric properties of agricultural products and definitions of dielectric terms and basic principles governing their influence on elelctromagnetic energy are presented briefly . The nature of dielectric properties variation with frequency, temperature , and product density is discussed, Graphical data on the dielectric properties of products are presented that illustrate the dependence of these properties on moisture content, frequency, temperature, and density. Applications microwave dielectric properties of agricultural products are cited that include radio-frequency (RF) and microwave heating for seed treatment, improvement of nutritional and keeping qualities of some products, and controlling insects in grain. Uses of dielectric properties for product quality measurement and the rapid determination of moisture content are described. Principle of moisture determination in bulk grain by RF and microwave measurements are briefly presented.