2020/09/07 by Matthias Bächle, Michael Heizmann · 1 voice
Engineering · #Advanced Sensor Technologies Research #Electrical and Bioimpedance Tomography #Flow Measurement and Analysis
paper · doi:10.1109/ius46767.2020.9251645
openalex publication_date 2020/09/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
The accuracy of ultrasonic flow measurements based on the transit-time principle is highly influenced by the level of superimposed interfering signals caused, among other things, by a dispersive multipath propagation across the pipe wall. This leads to an interference in the same frequency and time domain, preventing the use of conventional filtering. To avoid expensive constructive methods for suppressing the interfering signals, we present a digital signal processing approach that uses the different characteristics of the desired and the interfering signals. In this work, the variable time-delay property of the fluid signal is used. Thus, the temperature-dependent speed of sound and a varying flow velocity are exploited. To this end, multiple measurements with varying temperature and flow velocity are recorded and then processed to estimate the static interfering signals. The results are evaluated using the estimation error of the transit-time difference in a simulated and an experimental flow measurement scenario, respectively.