一种新的微波频率下混合电解质水溶液复等效介电常数的计算方法

目前,大部分电解质水溶液的等效介电常数计算模型是针对静止频率下其实部进行的.而对于实部与虚部同时计算方法的报道中,都是通过大量实验测量,利用德拜参数拟合而得到相应结果的,且局限于少数几种溶液,例如盐水和海水等.本文中,通过实验得到了不同电解质水溶液的复等效介电常数,基于此实验结果,提出了一个新的计算模型,引入了不同离子的复影响因子的概念,用来计算微波频率下电解质水溶液的复等效介电常数.在915MHz和2450MHz下,比较了实验结果和计算结果,它们比较好地符合,从而证明了公式的有效性.这将为微波化学中微波加热稀溶液化学反应中的电磁场和温度分布计算提供基础,同时也将对地球物理、遥感以及水污染监测等相关领域研究有帮助.

The New Method to Calculate the Complex Effective Permittivity of Mixed Aqueous Electrolyte Solution at Microwave Frequency

Some models have been established to calculate the static dielectric constant of aqueous electrolyte solution. Others models based on the fitting parameters in Debyeg equation by a lot of experiments and consequently were used to calculate the real and imaginary part of the complex effective permittivity of few aqueous electrolyte solutions, such as saline water and seawater. Here, the effective permittivity for various aqueous electrolyte solutions at microwave frequency has been gotten by the experiments, and we introduce the complex impact factor of different ion based on the experimental data and proposed a new model to calculate the complex effective permittivity of aqueous electrolyte solutions at microwave frequency. The calculated results are compared with the measured results at 915MHz and 2450MHz. The good agreement can be observed. This study offers base to calculate the distribution of electromagnetic field and temperature in the chemical reaction in dilute solution irradiated by microwaves and high potential applications of the method in the fields of geophysics, remote sensing, and inspection of water pollution.