METHOD OF MEASURING A VOLUME FLOW RATE OF A CONTROLLED MEDIUM IN A PIPELINE

摘要

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.