利用水负载测量微波功率公式中存在问题的若干评述  

Discuss of Some Problems Consist in Microwave Measurement formulas Using Water Load

作　　者：张兆镗[1] ZHANG Zhao-tang(University of Electronic Science and Technology of China, Chengdu 610054, China)

机构地区：[1]电子科技大学,四川成都610054

出　　处：《真空电子技术》2018年第2期65-68,共4页Vacuum Electronics

摘　　要：本文对利用水负载测量微波功率公式中存在的问题作了有关评述,主要涉及到水的密度的温度特性、水的介质损耗因子的温度特性等会对测量公式中有关参量产生重大影响,从而造成重大的测量误差。文中对起始温度及加热温差等作了详细讨论及建议。对采用将水加热到沸腾后产生汽化而计算汽化潜热的新方法也作了在理论上难以测准的原因分析,说明该方法可操作性不及已有的一些方法,因此不建议推广应用。Some problems consist in microwave measurement formulas using water load are discussed in this paper.The temperature characteristics of the specific gravity（or density）of water,and thetemperature characteristics of dielectric loss factor of waterhave a significant impact on the relevant parameters of the formula,which will result in a significant error.In this paper,the starting temperature and temperature difference are discussed and some suggestions are given in detail.Theoretically analysis is made on anew calculating method of latent heat of vaporization by heating water to boiling and then calculating the value.It shows that this method is difficult to achieve accurate measurement and is less operative than some other existing methods,and so it is not recommended for popularization and application.

关 键 词：水负载 箱式炉 隧道炉 微波测量 介电特性 比重特性 汽化潜热 

分 类 号：TN107[电子电信—物理电子学]