Journal article
Dielectric Properties of Fruits and Insect Pests as related to Radio Frequency and Microwave Treatments
Biosystems engineering, Vol.85(2), pp.201-212
2003
Handle:
https://hdl.handle.net/2376/113040
Abstract
Information on dielectric properties of commodities and insect pests is needed in developing thermal treatments for postharvest insect control based on radio frequency (RF) and microwave energy. Dielectric properties of six commodities along with four associated insect pests were measured between 1 and 1800
MHz using an open-ended coaxial-line probe technique and at temperatures between 20 and 60°C. The dielectric loss factor of fresh fruits and insects decreased with increasing frequency at constant temperatures. The loss factor of fresh fruits and insects increased almost linearly with increasing temperature at 27
MHz radio frequency, but remained nearly constant at 915
MHz microwave frequency. Both dielectric constant and loss factor of nuts were very low compared to those of fresh fruits and insects. The temperature effect on dielectric properties of nuts was not significant at 27
MHz. The large difference in the loss factor between insects and nuts at 27
MHz suggests possible differential heating of insects in nuts when treated at the same time in a RF system.
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Details
- Title
- Dielectric Properties of Fruits and Insect Pests as related to Radio Frequency and Microwave Treatments
- Creators
- S Wang - Department of Biological Systems Engineering, Washington State University, 213 L. J. Smith Hall, Pullman, WA 99164-6120, USA; e-mail of corresponding author: jtang@mail.wsu.eduJ Tang - Department of Biological Systems Engineering, Washington State University, 213 L. J. Smith Hall, Pullman, WA 99164-6120, USA; e-mail of corresponding author: jtang@mail.wsu.eduJ.A Johnson - United States Department of AgricultureE Mitcham - Department of Pomology, University of California, 1045 Wickson Hall, Davis, CA 95616-8683, USA; e-mail: ejmitcham@ucdavis.eduJ.D Hansen - USDA-ARS Yakima Agricultural Research Laboratory, 5230 Konnowac Pass Road, Wapato, WA 98951, USA; e-mail: jimbob@yarl.ars.usda.govG Hallman - USDA-ARS Sub tropical Agricultural Research Center 2413 E. Highway 83, Building 200, Weslaco, TX 78596, USA; e-mail: ghallman@weslaco.ars.usda.govS.R Drake - USDA-ARS Tree Fruit Research Laboratory, 1104 N. Western Ave., Wenatchee, WA 98801, USA; e-mail: drake@tfrl.ars.usda.govY Wang - Department of Biological Systems Engineering, Washington State University, 213 L. J. Smith Hall, Pullman, WA 99164-6120, USA; e-mail of corresponding author: jtang@mail.wsu.edu
- Publication Details
- Biosystems engineering, Vol.85(2), pp.201-212
- Academic Unit
- Department of Biological Systems Engineering; School of Chemical Engineering and Bioengineering
- Publisher
- Elsevier Ltd
- Identifiers
- 99900547628901842
- Language
- English
- Resource Type
- Journal article