【摘要】 科氏质量流量计通过检测两路振动信号的相位差获得流体的质量流量信息.对于直管式结构,科氏效应引起的相位差很小,同时振动信号的频率会由于外界干扰或流体特性变化而发生改变.因此,研究能够跟踪频率变化,并具有高精度的相位差检测方法是提高系统性能的关键.研究了用数字相关法实现科氏质量流量计的相位检测,提出了克服非整周期采样和实现频率跟踪的算法;另外,研究了相关法的相位测量误差的统计特性.更多还原

【Abstract】 An improved algorithm of using correlation to detect phase difference in Coriolis flow meter is described.It is based on the traditional way of using correlation to detect the phase difference in Coriolis flow meter.The new algorithm can overcome the frequency varying in Coriolis flow meter and reduce the error induced from non-period sampling.更多还原