【摘要】 构建了含水混合物介电特性模型,设计了基于此模型的开路同轴谐振腔传感器,并指出影响其传感特性的两个主要参数是保护盖介电常数和空载谐振频率。针对此问题,利用MATLAB对保护盖介电常数和空载谐振频率对传感器传感特性的影响进行了仿真和分析。加工了具有不同谐振频率的含水率传感器及不同介电常数的保护盖。实验结果表明,本文提出的模型能够很好地指导传感器的设计,同时选取Al2O3制作的保护盖和空载谐振频率为2.5G的同轴谐振腔具有较好的测量效果。更多还原

【Abstract】 A coaxial resonator moisture sensor is presented based on the model of mixture dielectric characteristic.Then the fact that the main factors influencing the moisture measurement are the dielectric constant of the protection cover and the no-load resonance frequency is pointed.The comprehensive simulations are given to analyze the affections caused by the two main factors in measurement.Three resonators of different frequencies and two protection covers with different materials are made.Experiments show that the methods adopted in paper is constructive for design of the sensor and to achieve good performances the no-load resonance frequency should be near 2.5GHz and the material of protection cover is Al2O3更多还原