Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 70, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2020.3007907
Keywords
Cross correlation; flow measurement; reciprocity; transit time; ultrasonic flowmeter; zero crossings; zero-flow error
Funding
- Dutch Technology Foundation STW [15031]
- Bronkhorst
- KROHNE
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This study introduces a new method that reduces zero-flow error while maintaining low random error, and can adapt to different hardware configurations. By combining the advantages of cross correlation and zero-crossing detection, an effective ultrasonic flowmeter algorithm has been developed.
Transit-time ultrasonic flowmeters are widely used in industry to measure fluid flow. In practice, ultrasonic flowmeters either show a zero-flow error or suffer from a significant random error due to a limited signal-to-noise ratio, requiring a significant amount of averaging to achieve good precision. This work presents a method that minimizes the zero-flow error while keeping the random error low, independent of the hardware used. The proposed algorithm can adjust to changing zero-flow errors, while a flow is present. The technique combines the benefits of two common methods of determining the transit time difference between the upstream and downstream ultrasonic waves: cross correlation and zero-crossing detection. The algorithm is verified experimentally using a flow loop. It is shown that the zero-flow error can he greatly reduced without compromising the random error or increasing circuit complexity.
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