测量气体折射率的微波谐振腔频率标定方法  

Method for Calibration of Microwave Resonator Frequency to Measure Refractive Index of Gas

作　　者：张瑜 秦元基 韩明硕 李爽 ZHANG Yu;QIN Yuan-ji;HAN Ming-shuo;LI Shuang(School of Electronic and Electrical Engineering,Henan Normal University,Xinxiang 453007,China;The Chinese People s Liberation Army 91709 Troops,Hunchun 133300,China;School of Physics and Electronic Information,Luoyang Normal University,Luoyang 471000,China)

机构地区：[1]河南师范大学电子与电气工程学院,河南新乡453007 [2]中国人民解放军91709部队,吉林珲春133300 [3]洛阳师范学院物理与电子信息学院,河南洛阳471000

出　　处：《仪表技术与传感器》2021年第7期117-121,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金(61077037);河南省科技攻关重点项目(172102210046)。

摘　　要：利用微波谐振腔实现对气体折射率的测量,需在真空环境中精确确定测量系统的零点频率,即微波谐振腔零点频率。针对微波谐振腔定标中真空度难以保证的现状,提出了一种常规大气环境下腔体零点频率的标定方法。通过精确测量大气环境的温度、湿度、压强参数得到高精度实时折射率,最后根据得到的高精度实时折射率对腔体谐振零点频率进行调节,以实现谐振腔的零点频率标定。实验结果表明,该方法具有误差小、调节方便的特点,且能够保证整个微波测量系统的测量精度。To measure the refractive index of gas with microwave resonator,the zero frequency of the measuring system,namely the zero frequency of microwave resonator,must be determined accurately in vacuum.In view of the fact that the vacuum degree is difficult to be guaranteed in the calibration of microwave resonator,a calibration method for the zero frequency of microwave resonator in conventional atmospheric environment was proposed.By accurately measuring the temperature,humidity and pressure parameters of atmospheric environment,high-precision formula was used to calculate the refractive index.Finally,according to the high-precision real-time refractive index,the resonant zero frequency of cavity was adjusted to realize the zero frequency calibration of resonator.The experimental results show that the method has the characteristics of small error and easy adjustment,and guarantee the measurement accuracy of the whole microwave measurement system.

关 键 词：微波测量 气体折射率 谐振腔 谐振频率 

分 类 号：TN606[电子电信—电路与系统]