复介电常数在绝缘子污秽检测中的应用

根据微波辐射特性，提出了一种新的污秽检测方法，该方法利用污秽物的复介电常数特性作为主要参数之一来测量污秽等级。分析了污秽复介电常数与辐射亮温的关系，并利用微波波导测量法测量了实验室制备的各种不同含水含盐的污秽物的复介电常数，研究了介电常数的实部和虚部与含水量、盐度的关系，给出了污秽辐射亮温与盐度的关系。实验研究结果表明污秽物复介电常数的实部与含水量、虚部与盐度存在确定关系，这为利用微波辐射计检测污秽物的性质提供了可能和实验依据。

A Study of Contamination Detecting of Insulators Using the Complex Dielectric Constant

A new method based on the pollutant's radiation characteristic for detecting pollution on the electronic devices such as insulators is proposed.The complex dielectric constant of contamination is one of the important parameters affecting the measurement results.The correlation between the dielectric constant of contamination and the brightness temperature is analyzed and contamination samples prepared in laboratory with different moisture and salinity contents are measured by adopting microwave waveguide measurement.The real and imaginary parts of the dielectric constants are evaluated as a function of salinity and water content,and the relation between the brightness temperature and the salinity of contamination is then given.The measurement results indicate an ascertained relation between the real parts and the water content as well as the imaginary parts and the salinity.