一种用于液相检测的耗散型石英晶体微天平振荡电路设计

由于液相环境的特殊性，传统石英晶体微天平(quartz crystal microbalance,QCM)仅依靠谐振频率f无法完整描述溶液与吸附膜的力学性质，为此需引入新的参数——耗散因子D。同时，液相环境中普通振荡电路存在诸多问题，所以研究基于耗散因子D的耗散型石英晶体微天平(QCM-D)振荡电路具有重要意义。本文将QCM振荡电路与耗散因子D相结合，通过使用并联电容补偿与自动增益控制技术，设计出适用于QCM-D的振荡电路和相应的系统调试方案，其能稳定振荡在80%浓度的丙三醇溶液中。

A dissipative quartz crystal microbalance oscillation circuit design for liquid phase detection

Due to the special characteristics of the liquid phase environment, the conventional quartz crystal microbalance (QCM) cannot completely describe the physical properties of the liquid phase by only relying on the resonant frequency f. The introduced new parameter, dissipation factor D, can relatively completely characterize the mechanical properties of the solution and the adsorption membrane, so it is important to study the dissipative quartz crystal microbalance based on the dissipation factor D (QCM-D) is of great importance. In this paper, the QCM oscillator circuit is combined with the dissipation factor D. By using parallel capacitance compensation and automatic gain control technology, an oscillator circuit suitable for QCM-D and corresponding system debugging and experimental verification schemes are designed, which can stabilize the oscillation at 80% concentration in glycerol solution.