使用驻波比法研究微波辐射对烟草(Nicotiana tabacum)的影响

Dr. Govind A. Karhale
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引用次数: 0

摘要

在 9.85 GHz 微波频率和不同温度(200℃、35℃ 和 500℃)下,测量了不同堆积密度样品的介电常数 (ε'p)、介电损耗 (ε "p)、弛豫时间 ( p) 和电导率 ( p)。使用 X 波段微波台在 9.85 GHz 单高频范围内测量了烟叶的复介电常数。使用粉末样品支架测量介电参数。我们在南德科学学院 NES 微波研究实验室设计并制作了样品支架。在相对堆积分数 δr = 1 时,发现介电常数( )和介电损耗( )的实验值和计算值相同。上述事实表明,介电参数的计算值与固体块体的测量值相当吻合。博彻的相关公式可用于准确估算已知体积密度下粉末材料的( )和( )。获得的 ( p) 值表明,介电损耗因子 ( p) 会随着材料体积密度的增加而增加。电导率随着填料分数的增加而增加,这表明,在较高的压实度下,颗粒的填料更紧密,样品中不会产生微裂缝。随着填料分数(δr)和温度的升高,样品的含水量呈线性下降。(p)、( p)、tanδ 和 σp 随相对填料分数(δr)和温度的变化清楚地表明了密度和温度对介电参数的影响。结果表明,所研究的烟叶粉末颗粒具有较大的内聚力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Microwave Radiation on Tobacco (Nicotiana tabacum) Using VSWR Method
The values of dielectric constant (ε'p), dielectric loss (ε"p), relaxation time ( p) and conductivity ( p) of the sample were measured for different packing densities at 9.85 GHz microwave frequency and different temperature (200C, 35°C and 500C). Complex permittivity of Tobacco leaves has been measured over the 9.85 GHz single High frequency range using X - band microwave bench. To measure the dielectric parameter by using Sample holder for pulverized sample. We have designed and fabricated the sample holder at Microwave Research Laboratory, NES, Science College, Nanded. The experimental and calculated values for dielectric constant ( ) and dielectric loss ( ) are found to be same at relative packing fractions δr   = 1. The above fact indicates that there is a fair agreement between calculated values of dielectric parameters and measured values of solid bulk. The co-relation formulae of Bottcher can be used to provide accurate estimates of ( ) and ( ) of powder materials at known bulk densities. The values of ( p) obtained suggest that the dielectric loss factor ( p) increases with the increase of bulk density of the material. The increase in conductivity with increase of packing fraction suggests that, at higher compaction the particles are more packed, and no micro-cracks developed in the samples. As packing fractions (δr) and temperature increases the moisture content of sample decreases linearly. The variations of ( p), ( p),  tanδ, and σp with relative packing fraction (δr), and temperature clearly indicates that, effect of density and temperature on the dielectric parameters. The result shows that large cohesion in the particles of Tobacco leaves powder under investigations.
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