Trabelsi Samir, Nelson Stuart O, Lewis Micah A
U. S. Department of Agriculture, Agricultural Research Service, Richard B. Russell Agricultural Research Center, Athens, GA 30604-5677, USA.
J Microw Power Electromagn Energy. 2010;44(2):72-80. doi: 10.1080/08327823.2010.11689775.
Dielectric properties of samples of shelled corn of "natural" water content and those prepared by adding water were measured in free space at microwave frequencies and 23 degrees C. Results of measurements of attenuation, phase shift and dielectric constant and loss factor at 9 GHz show no difference between the samples with "natural" water and those in which water was added artificially. Bulk densities and moisture contents predicted from calibration equations expressed in terms of dielectric properties of both natural and added water samples agreed closely, and standard errors were less than 1% for moisture content and relative error for bulk density was less than 5%.
在微波频率和23摄氏度的自由空间中，测量了含水量为“自然”状态的带壳玉米样品以及添加水制备的样品的介电特性。9吉赫兹下的衰减、相移、介电常数和损耗因子的测量结果表明，含水量为“自然”状态的样品与人工添加水的样品之间没有差异。根据以自然和添加水样品的介电特性表示的校准方程预测的堆积密度和水分含量非常吻合，水分含量的标准误差小于1%，堆积密度的相对误差小于5%。
