Nondestructive sensing of bulk density and moisture content in shelled peanuts from microwave permittivity measurements

被引：26
|
作者：
Trabelsi, S
Nelson, SO
机构：
[1] USDA, ARS, QARU, Richard B Russell Agr Res Ctr, Athens, GA 30604 USA
[2] Univ Georgia, Driftmier Engn Ctr, Dept Agr & Biol Engn, Athens, GA 30605 USA
来源：
FOOD CONTROL | 2006年 / 17卷 / 04期
关键词：
nondestructive; shelled peanuts; bulk density; moisture content; complex permittivity; microwave; free space;
D O I：
10.1016/j.foodcont.2004.11.004
中图分类号：
TS2 [食品工业];
学科分类号：
0832 ;
摘要：
Dielectric-based methods were used to determine nondestructively and simultaneously bulk density and moisture content in shelled peanuts from measurement of their relative complex permittivity at microwave frequencies (7-12 GHz) and 24 degrees C. The first method is based on direct relationships between the two components of the relative complex permittivity (dielectric constant and dielectric loss factor) and the bulk density and moisture content. The second method allows bulk density determination without knowledge of moisture content and temperature of shelled peanut samples from a complex-plane representation of the relative complex permittivity. Finally, moisture content in shelled peanuts is determined independent of bulk density changes with the use of density-independent permittivity functions. Statistical analysis provided bulk density and moisture content calibration equations at several microwave frequencies along with corresponding standard errors of calibration over wide ranges of bulk density and moisture content. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：304 / 311
页数：8
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