介电常数的实地测量装置的研制

Research of device to In-situ measurement dielectric constant

介绍自由空间法实地测量介电常数的原理、方法和系统,依据原理,搭建室内测量系统进行了介电常数测量,利用S波段喇叭天线在垂直入射条件下接收反射波的幅度和相位,并采用金属板绝对定标法获得被测目标的反射系数,根据菲涅尔反射定律反演得到了土壤的介电常数。测量过程中引入时域去嵌技术有效抑制了多路径干扰信号,提高了幅度测量的精度;验证了测量相位的准确性,并给出了测量结果与模拟结果的比对,证明了实验的可实施行。

This Article introduces the free space method to in-situ measure dielectric constants＇ principal,measurement According to the measuring principle,the first building interior measurement system for the dielectric constant of measurement,The experiment used S band horn antenna in perpendicular incident condition to receiving amplitude and phase of reflection wave,and the metal plate absolute calibration method was measured reflectivity of soil,then according to the law of Fresnel reflection got inversion of dielectric constant of soil.the measurement accuracy verification phase,and the measurement results and simulation results prove the experiment,the implementation.