石英晶体微天平驱动电路设计

石英晶体微天平能够测量微小质量的变化,其广泛应用在生物医学、蛋白质、气体等的吸附检测。本电路设计以STC15F2K60S2单片机为核心,利用石英晶振片的特性,振荡器的起振、稳定振荡原理,以及自动增益控制等方法,构造稳定的振荡电路,实现对石英晶片频率变化的直接测量,进而推断出相应的质量变化。使用LCD显示模块,实时显示频率、质量等的测量值,并扩展RS232接口,实现与上位机之间的通信。

The new driving circuit design of quartz crystal microbalance

The quartz crystal microbalance （QCM） can measure tiny quality change, and has been widely used in biomedical, protein, gases adsorbed detection. The circuit design , to STC 15F2K60S2 MCU as the core, using the characteristics of quartz crystal piece and the oscillator starting, stable oscillation principle, as well as AGC circuit structure ,can achieve a direct measurement of the change in frequency of the quartz crystal, and then infer a corresponding change in mass. The circuit equipped with LCD display module, the measured values of the frequency, quality can be real-time displayed, and expansion of the RS232 interface, convenient and direct communication with the host computer.