Method for measuring mixed gas flow based on differential ultrasonic flowmeter

The invention provides a method for measuring mixed gas flow based on a differential ultrasonic flowmeter, and the method comprises the steps: obtaining the amplitude of relaxation absorption at two different frequencies and the corresponding relaxation frequency through the differential ultrasonic flowmeter; the difference is carried out, then the concentration of each component in the mixed gas is calculated, the fluid flow is calculated through the concentration of each component, the measurement error is reduced, the measurement accuracy is improved, and meanwhile the concentration value of the components in the mixed gas is obtained while the flow of the mixed gas is measured. 本发明提供本发明提供一种基于差分式超声流量计测量混合气体流量的方法，该测量混合气体流量的方法通过差分式超声流量计获取两种不同频率下的弛豫吸收的幅值和对应的弛豫频率，进行差分后再进行混合气体中各组分浓度的计算，通过各组分的浓度计算流体流量，减小测量误差，提高测量的准确度，同时在测混合气体流量的同时获得了混合气体中成分的浓度值。