准直光
微波食品加热
水分
电介质
衰减
材料科学
含水量
光学
图层(电子)
介电常数
相(物质)
复合材料
分析化学(期刊)
矿物学
光电子学
物理
化学
地质学
色谱法
岩土工程
量子力学
激光器
作者
R. J. King,Kristin King,Koan Sik Woo
摘要
A two-parameter transmission technique is described for online, in situ measurement of the bulk moisture content of grains using microwaves. This noncontacting 4.9-GHz system is configured so that a well-collimated TEM beam is transmitted through a layer of grain, e.g., moving on a conveyer or flowing in a chute. The changes in attenuation and phase serve as two independent measurement parameters from which the wet and dry basis weights (grams per square centimeter) and moisture can be found using a linear model, independent of the layer thickness. If the layer thickness is also known, the wet and dry densities (grams per cubic centimeter) and complex dielectric constant can be found.< >
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