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 natu