说明：  压电晶体式涡街流量传感器放大电路的设计 通过对涡街信号频谱的分析，发现涡街传感器主要干扰源为固有振荡频率，并设计了解决此种干扰的传感器放大电路。
(Piezoelectric Crystal Vortex flow sensor amplification circuit through the vortex signal spectrum analysis, we found the main source of interference vortex sensor for the natural oscillation frequency, and designed to resolve such interference with the sensor amplifier circuit.)