Method for ultrasonic Doppler fluid flow measurement with improved spatial resolution

摘要

1. A method of carrying out ultrasonic flow measurements in accordance with the Doppler principle, wherein previously transmitted ultrasound (24, 25) is received as reflected ultrasound (23 ; 24', 25'), with a Doppler frequency shift DELTA f corresponding to the flow speed to be measured, where the flow is measured at the location of the intersection (124, 125 ; 224, 225) of the transmitting sound lobe and the receiving sound lobe and is determined from the signal of the receiving transducer (22, 31), characterized in that for the detection and/or analysis of the complete flow profiles inside the pipeline (1) the angle alpha of the sound lobe (24, 25, 23 ; 24, 25, 24', 25') of at least one of the transmitting and receiving transducers (21, 22 ; 21, 31) is changed for individual measurements within an angle range alpha n such that a representative portion of the flow profil of the cross-section inside the pipeline (1) is detected.