Measurement and applications of dielectric properties of agricultural products

The dependence of the dielectric properties of materials on other variables is discussed as it relates to agricultural products. Measurement techniques for determining dielectric properties of such materials are reviewed briefly, and graphical data are presented to illustrate the dependence of dielectric properties of some products on frequency, moisture content, temperature, and density. Several agricultural applications in which dielectric properties information is useful are discussed. >

[1]  Stuart O. Nelson,et al.  RF and Microwave Dielectric Properties of Shelled, Yellow-Dent Field Corn , 1979 .

[2]  M. Kent,et al.  Microwave measurement of powder moisture and density , 1987 .

[3]  S. Nelson,et al.  Dielectric Properties of Materials for Microwave Processing—Tabulated♦♦ , 1973 .

[4]  Stuart O. Nelson,et al.  Microwave Dielectric Properties of Fresh Fruits and Vegetables , 1980 .

[5]  S. Nelson.  Observations on the Density Dependence of Dielectric Properties of Particulate Materials , 1983 .

[6]  Stuart O. Nelson,et al.  Comparative Effectiveness of 39- and 2450-MHz Electric Fields for Control of Rice Weevils in Wheat , 1974 .

[7]  S. Nelson,et al.  Relationships between microwave permittivities of solid and pulverised plastics , 1990 .

[8]  Stuart O. Nelson,et al.  A General Computer Program for Precise Calculation of Dielectric Properties from Short-Circuited Waveguide Measurements , 1974 .

[9]  Maria A. Stuchly,et al.  ANA Calibration Method for Measurements of Dielectric Properties , 1983, IEEE Transactions on Instrumentation and Measurement.

[10]  Stuart O. Nelson.  Insect-Control Studies with Microwaves and Other Radiofrequency Energy , 1973 .

[11]  E. F. Burton,et al.  A NEW METHOD FOR THE RAPID ESTIMATION OF MOISTURE IN WHEAT , 1929 .

[12]  S. Nelson.  Microwave Dielectric Properties of Insects and Grain Kernels , 1976 .

[13]  Stuart O. Nelson,et al.  Dielectric Properties of Some Fresh Fruits and Vegetables at Frequencies of 2.45 to 22 GHz , 1983 .

[14]  Stuart O. Nelson.  Microwave Dielectric Properties of Grain and Seed , 1973 .

[15]  Stuart O. Nelson,et al.  A Method for Determining Dielectric Properties of Grain and Seed in the 200- to 500-MHz Range , 1970 .

[16]  L. Stetson,et al.  Frequency and moisture dependence of the dielectric properties of hard red winter wheat , 1976 .

[17]  A. W. Kraszewski,et al.  Microwave Monitoring of Moisture Content in Grain - Further Considerations , 1988 .

[18]  R. Clarke,et al.  The measurement of the properties of materials , 1986, Proceedings of the IEEE.

[19]  S. O. Nelson,et al.  A Bridge Method for Dielectric Measurements of Grain and Seed in the 50- to 250-MHz Range , 1970 .

[20]  U. Kaatze,et al.  Dielectric relaxation spectroscopy of liquids: frequency domain and time domain experimental methods , 1980 .

[21]  Stuart O. Nelson,et al.  Composite model of the complex permittivity of cereal grain , 1989 .

[22]  Stuart O. Nelson,et al.  Dielectric Properties of Rice at Frequencies from 50 HZ to 12 GHZ , 1989 .

[23]  N. E. Bengtsson,et al.  Dielectric Properties of Foods at 3 GHz as Determined by a Cavity Perturbation Technique. , 1971 .

[24]  Stuart O. Nelson,et al.  TEMPERATURE DEPENDENCE OF THE DIELECTRIC PROPERTIES OF WHEAT , 1990 .

[25]  M. E. Brodwin,et al.  Automatic material characterization at microwave frequencies , 1988 .

[26]  Stuart O. Nelson,et al.  A System for Measuring Dielectric Properties at Frequencies from 8.2 to 12.4 GHz , 1972 .

[27]  Stuart O. Nelson,et al.  Electrical Properties of Agricultural Products-A Critical Review , 1973 .

[28]  Stuart O. Nelson,et al.  Models for the Dielectric Constants of Cereal Grains and Soybeans , 1987 .

[29]  S. O. Nelson,et al.  Frequency Dependence of Energy Absorption by Insects and Grain in Electric Fields , 1972 .

[30]  Stuart O. Nelson.  Improved Sample Holder for Q-Meter Dielectric Measurements , 1979 .

[31]  Stuart O. Nelson.  Dielectric Properties of Grain and Seed in the 1 to 50-MC Range , 1965 .

[32]  H. E. Bussey,et al.  Measurement of RF properties of materials a survey , 1967 .

[33]  Kurt C. Lawrence,et al.  Automatic System for Dielectric Properties Measurements from 100 kHz to 1 GHz , 1989 .