Feasibility of Ultrasonic Flow Measurements via Non-Linear Wave Propagation
conference paper
Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a more precise flow measurement. However, the question arises whether the increased bandwidth can be used in practice, since the intensity of the 2ndharmonic can be 25 dB below the fundamental. One exploit of the increased bandwidth is to filter the received signals and to obtain two components: the fundamental and the 2nd harmonic. Differences between the upstream and downstream transit times are directly related to the flow speed, and these can be computed for each component of the received signals. This paper shows that averaging the transit time differences of the fundamental signals and the 2ndharmonic signals results in a lower standard deviation compared to the standard deviation of the transit time differences of the fundamental or the 2ndharmonic signal alone. This demonstrates the feasibility of using non-linear wave propagation to improve the precision of flow measurements using ultrasound. © 2018 IEEE.
Topics
TNO Identifier
861887
ISSN
19485719
ISBN
9781538634257
Publisher
IEEE Computer Society
Article nr.
8579943
Source title
IEEE International Ultrasonics Symposium, IUS, 2018 IEEE International Ultrasonics Symposium, IUS 2018, 22 October 2018 through 25 October 2018
Files
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