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United States Department of Agriculture

Agricultural Research Service

Title: Dielectric Properties of Agricultural Products and Their Use in Moisture Sensing and Other Applications

item Nelson, Stuart

Submitted to: International Conference on Agricultural Machinery Engineering
Publication Type: Proceedings
Publication Acceptance Date: November 12, 1996
Publication Date: N/A

Interpretive Summary: An interpretive summary is not required for a literature review, book chapter (unless reporting original research), book review, or oral presentation (where only the title or abstract is published. Refer to directive 152.1 4/3/91

Technical Abstract: Historical interest in dielectric properties of agricultural products and definitions of dielectric terms and basic principles governing their influence on electromagnetic 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 of the 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. Principles of moisture determination in bulk grain by RF and microwave measurements are briefly presented.

Last Modified: 4/22/2015
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