Method and device for measurement of flow rates

Method for determining the flow rate of all interacting with electromagnetic waves components (31, 32) of a feed line (20) flowing fluid (30), at least an electromagnetic signal of a predetermined frequency through the fluid (30) and further delayed in space is performed, wherein the original and the resulting signal are recorded, characterized in that the evaluation unit from the Doppler shift between the original and the resultant signal determines the speed, the velocity profile and the volume fraction of each component (31, 32) in the flowing fluid (30) ,