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Dielectric properties of cereals at frequencies useful for processes with microwave heating

机译:谷物的微波介电特性对微波加热过程有用

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摘要

Dielectric properties of barley, corn (white and yellow), sorghum, and wheat at microwave frequencies for heating purpose were analyzed. Properties were determined at 915, 2450 and 5800 MHz with the free space transmission method in the cereals at 20, 30, 40, 50 and 60 °C. ε´ and ε“of all the cereals decreased with increasing frequency. ε´ slightly increased with temperature, while ε “remained practically constant for all the cereals in the temperature range from 20 to 60 °C. Penetration depth decreased with increasing frequency for all the samples, and increased with increasing temperature at 915 MHz, except for barley. These results are useful for further microwave heating applications for the studies on cereals.
机译:分析了大麦,玉米(白色和黄色),高粱和小麦在微波频率下的加热特性。在20、30、40、50和60°C下,通过自由空间传输方法在915、2450和5800 MHz下测定谷物的特性。所有谷物的ε´和ε”随频率增加而降低。 ε'随温度略有增加,而“ε”在20至60°C的温度范围内对所有谷物几乎保持恒定。除大麦外,所有样品的穿透深度均随频率增加而降低,并随温度升高(915MHz)而增加。这些结果对于谷物研究中的进一步微波加热应用是有用的。

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