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首页> 外文期刊>E3S Web of Conferences >Measurement and Analysis of Dielectric Properties of Agricultural By-product Powders in Microwave Frequency Range
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Measurement and Analysis of Dielectric Properties of Agricultural By-product Powders in Microwave Frequency Range

机译：微波频率范围内农副产品粉介电特性的测量与分析

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摘要

Dielectric properties play an important role in the microwave-assisted application of nonmagnetic agriculture-related media. In this paper, the practical requirements for the lack of quantitative data on the dielectric properties of agricultural media in microwave-assisted applications are obtained. The dielectric properties data of four kinds of agricultural by-products powder (Potato powder, Pseudo -ginseng Powder, Gastrodia elata powder, Dendrobium chrysotoxum Lindl powder) under microwave frequency were measured, and related factors were analyzed. The results show that the uncalibrated coaxial transmission reflection method can be used to measure and analyse the dielectric properties of high frequency bands of powder materials. Dielectric constant (ε ′) and Dielectric loss factor (ε '') of agricultural by-products at room temperature have a relationship between microwave frequency and moisture content. It is a dependent and the mathematical relation is satisfied. The influence of microwave frequency and moisture content on the dielectric properties is as follows: lows: ε′>ε′′>tanδ. Under the conditions of civil microwave frequency (2.45GHz) and moisture content (2% ~ 25%), the dielectric constant and the dielectric loss factor of different kinds of agricultural by-products powder are in the range of 3.5 ~ 9 and 0.1 ~ 3.2 respectively. The results provide data basis for microwave processing and quality monitoring of agricultural by-products powder. The technical method is suitable for the measurement and analysis of the dielectric properties of powder materials.
机译：介电特性在微波辅助非磁性农业相关介质的应用中起着重要作用。本文获得了在微波辅助应用中缺少有关农业介质介电特性的定量数据的实际要求。测量了四种农副产品粉（马铃薯粉，伪人参粉，天麻粉，石end石，粉）在微波频率下的介电性能数据，并分析了相关因素。结果表明，未校准的同轴透射反射方法可用于测量和分析粉末材料高频段的介电性能。室温下农业副产品的介电常数（ε）和介电损耗因子（ε）与微波频率和水分含量之间存在关系。它是一个依存关系，并且满足数学关系。微波频率和水分含量对介电性能的影响如下：低点：ε′>ε′′>tanδ。在民用微波频率（2.45GHz）和水分含量（2％〜25％）的条件下，不同种类的农副产品粉末的介电常数和介电损耗因子在3.5〜9和0.1〜2的范围内。 3.2分别。研究结果为农副产品粉末的微波处理和质量监测提供了数据依据。该技术方法适用于粉末材料介电性能的测量和分析。

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