基于微扰法的气体折射率测试仪的设计  

Design of Gas Refractive Index Tester Based on Perturbation Method

作　　者：张瑜 崔鸣宇 史水娥 ZHANG Yu;CUI Ming-yu;SHI Shui-e(School of Electronic and Electrical Engineering,Henan Normal University,Xinxiang 453000,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453000

出　　处：《仪表技术与传感器》2022年第6期45-50,共6页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(61077037);河南省科技攻关计划项目(172102210046)。

摘　　要：折射率是气体的重要物理性质,精确测量气体的折射率具有重要意义。以腔体微扰理论为原理,利用微波谐振腔的谐振频率随腔内介质的折射率变化而发生偏移的特性,通过测量微波谐振腔谐振频率的偏移量获得气体的折射率,由于该方法采用3 cm微波谐振频率,其频率的偏移量可以精确测量出来,获得的折射率精度很高。通过实验表明该系统具有反应速度快、稳定性好、时效性好的特点。在海上蒸发波导实际测试中,可精确测量出大气结构参数,为蒸发波导在线测量,实现雷达超视距探测和波导电磁盲区补盲措施提供可靠依据。Refractive index is an important physical property of gas,and it is important to accurately measure the refractive index of gas.Based on the principle of cavity perturbation theory,the refractive index of gas was obtained by measuring the offset of the resonant frequency of microwave resonant cavity with the change of refractive index of the medium inside the cavity.In this method,the microwave resonance frequency of 3 cm was used,and the offset of the frequency can be accurately measured,and the refractive index obtained is very accurate.The experiments show that the system has the characteristics of fast response,good stability and good timeliness.In the actual test of evaporative waveguide at sea,the atmospheric structure parameters can be accurately measured,providing a reliable basis for the online measurement of evaporative waveguide and the realization of radar over-the-horizon detection and waveguide electromagnetic blind spot filling measures.

关 键 词：微扰法 谐振腔 折射率 蒸发波导 大气结构参数 

分 类 号：TN606[电子电信—电路与系统]