Exploiting nonlinear wave propagation to improve the precision of ultrasonic flow meters
J.M. Massaad Mouawad (TU Delft - ImPhys/Medical Imaging)
P. L.M.J. van Neer (TU Delft - ImPhys/Medical Imaging, TNO)
Douwe Van van Willigen (TU Delft - Electronic Instrumentation)
Nico de Jong (Erasmus MC, TU Delft - ImPhys/Medical Imaging)
M.A.P. Pertijs (TU Delft - Electronic Instrumentation)
M.D. Verweij (Erasmus MC, TU Delft - ImPhys/Medical Imaging)
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Abstract
Acoustic wave propagation in ultrasonic flow measurements is typically assumed to be linear and reciprocal. However, if the transmitting transducer generates a sufficiently high pressure, nonlinear wave propagation effects become significant. In flow measurements, this would translate into more information to estimate the flow and therefore a higher precision relative to the linear case. In this work, we investigate how the generated harmonics can be used to measure flow. Measurements in a custom-made flow loop and simulations using the Khokhlov–Zabolotskaya–Kuznetsov (KZK) equation will show that the second harmonic component provides similar transit time differences to those obtained from the fundamental component, their linear combination results in more precise flow measurements compared to the estimations with the fundamental component alone.
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