Patent ID: 8573026

Claim:
A sound entrainment method for ascertaining volume- or mass-flow of a medium in a pipeline, or measuring tube, of radius (r) comprising the steps of: transmitting and/or receiving ultrasonic measuring signals along a plurality of defined sound paths (m); establishing, during a calibration phase, successive, different flow profiles (v(r)) of a measured medium in the pipeline, or in the measuring tube; ascertaining for each flow profile (v(r)), a defined volume flow, or a defined mass flow; describing, on the basis of measured values (v x (r 1 ) . . . v x (r m )) ascertained in the separate measuring paths (m), each flow profile (v(r)) established in the pipeline, or in the measuring tube, by a characteristic parameter set (a 1 , . . . , a n with nεN); calculating, for each flow profile (V(r)), on the basis of the defined volume- or mass-flow and on the basis of the measured volume- or mass-flow, a flow-profile-dependent correction factor MF(a 1 , . . . , a n ); and correcting, subsequently in measurement operation, a volume- or mass-flow ascertained via the parameter set (a 1 , . . . , a n with nεN) with the flow-profile-dependent correction factor MF(a 1 , . . . , a n ) determined during the calibration phase, wherein during the calibration phase, the velocities v x (r 1 ) . . . v x (r m ) in the flow paths are ascertained for each flow profile x, where m stands for the number of measuring paths.