用于折射率仪的高Q腔谐振频率跟踪系统

A High Q Cavity's Resonant Frequency Tracking System Used in Refractometer

提出了一种用于折射率仪的采用方波调制的微波高Q腔谐振频率跟踪系统，分析了其工作原理。计算机仿真结果表明，系统跟踪速度快，稳定性好，无稳态误差；在小型微波折射率仪中的应用结果表明，作为系统输出的VCO频率对高Q腔谐振频率的跟踪灵敏度优于5×10-8f0（f0为高Q腔谐振频率）。

This paper presents a resonant frequency tracking system based on Square -wave modulation of a high Q microwave cavity. By computer simulation, we can see that the system has a high tracking speed and a good stability, and has no steady-state error. The system has been used in a small type microwave refractometer, and has achieved a frequency tracking sensitivity better than 5 ×10-8f0 (f0 is the resonant frequency of the cavity ).