Abstract: Method comprises transmitting and receiving ultrasound signals (USS) in and counter direction of flow (ICDF) of controlled medium in pipeline (CMP); determining times of USS transmission ICDF of CMP and difference therebetween; forming time difference code; forming array of address codes corresponding to zero crossing moments of codes of USS passed ICF of CMP; determining zero crossing moment address code for codes of USS passed ICF of CMP closest to mutual correlation function (MCF) maximum address codes; selecting codes of USS passed ICDF of CMP corresponding to MCF maximum; forming MCF of selected part of codes of USS passed ICDF of CMP and signal shifted by 90° to primary USS; digitizing these MCF forming codes of time transmission of USS passed ICDF of CMP within sampling rate interval; determining accurate difference code of time intervals between USS passed ICDF of CMP; and determining CMP volume flow rate from a formula.

Abstract: A device for measuring the volume flow rate of the controlled medium in a pipeline comprises first and second transmitting-receiving radiators installed and spaced on the pipeline and alternately fed with ultrasonic signals. Received after they have passed in and counter the direction of the flow, the signals are digitized and stored. Times of signal transmission in and counter the direction of the flow of the medium and the difference of the times are calculated. Providing an additional unit for the time difference calculation, applying a correlation measuring method and increasing the sampling rate enhance the accuracy in measuring the volume.