新型液体中双调制式石英晶体传感器系统的研制

Development of a New Kind of Dual Modulated Quartz

传统的调频式石英晶体传感器无法区分引起频率变化的两种不同负载效应，介绍一种新型液体中双调制式石英晶体传感器系统，讨论了传感器谐振电路、液体测头结构及采集系统的设计。实验表明，该传感器在液体中３个小时频率稳定度达到±５Ｈｚ，幅值达到±２．５ｍＶ，液体的高度对传感器输出基本没有影响。

Traditional frequency modulated quartz crystal sensors can not distinguish between the two different loading effects which result in frequency change. This paper presents a new kind of dual modulated quartz crystal sensor system in liquids, and discusses the design of the resonance circuit, liquid sensor head, and the sampling system. The experiment shows that the frequency stability of the sensor can reach Hz, and the amplitude .5 mV within 3 hours. The sensor output is hardly influenced by the liquid height.