During ultrasonic clamp-on flow metering, Lamb waves propagating in the pipe wall may limit the measurement accuracy by introducing absolute errors in the flow estimates. Upon reception, these waves can interfere with the up and downstream waves refracting from the liquid, and disturb the measurement of the transit time difference that is used to obtain the flow speed. Thus, suppression of the generation of Lamb waves might directly increase the accuracy of a clamp-on flow meter. Existing techniques apply to flow meters with single element transducers. This paper considers the application of transducer arrays and presents a method to achieve a predefined amount of suppression of these spurious Lamb waves based on appropriate amplitude weightings of the transducer elements. Finite element simulations of an ultrasonic clamp-on flow measurement setting will be presented to show the effect of array aperture control on the suppression of the Lamb waves in a 1-mm-thick stainless steel pipe wall. Furthermore, a proof-of-principle experiment will be shown that demonstrates a good agreement with the simulations.
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April 2020
April 28 2020
Suppression of Lamb wave excitation via aperture control of a transducer array for ultrasonic clamp-on flow metering
Jack Massaad
;
Jack Massaad
a)
1
Laboratory of Medical Imaging, Department of Imaging Physics, Delft University of Technology
, 2628CJ Delft, the Netherlands
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Paul L. M. J. van Neer
;
Paul L. M. J. van Neer
b)
1
Laboratory of Medical Imaging, Department of Imaging Physics, Delft University of Technology
, 2628CJ Delft, the Netherlands
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Douwe M. van Willigen
;
Douwe M. van Willigen
c)
2
Electronic Instrumentation Laboratory, Department of Microelectronics, Delft University of Technology
, 2628CD Delft, the Netherlands
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Michiel A. P. Pertijs
;
Michiel A. P. Pertijs
d)
2
Electronic Instrumentation Laboratory, Department of Microelectronics, Delft University of Technology
, 2628CD Delft, the Netherlands
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Nicolaas de Jong;
Nicolaas de Jong
1
Laboratory of Medical Imaging, Department of Imaging Physics, Delft University of Technology
, 2628CJ Delft, the Netherlands
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Martin D. Verweij
Martin D. Verweij
1
Laboratory of Medical Imaging, Department of Imaging Physics, Delft University of Technology
, 2628CJ Delft, the Netherlands
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Jack Massaad
1,a)
Paul L. M. J. van Neer
1,b)
Douwe M. van Willigen
2,c)
Michiel A. P. Pertijs
2,d)
Nicolaas de Jong
1
Martin D. Verweij
1
1
Laboratory of Medical Imaging, Department of Imaging Physics, Delft University of Technology
, 2628CJ Delft, the Netherlands
2
Electronic Instrumentation Laboratory, Department of Microelectronics, Delft University of Technology
, 2628CD Delft, the Netherlands
a)
Electronic mail: [email protected], ORCID: 0000-0002-3905-1206.
b)
Also at: Department of Acoustics and Sonar, TNO, 2597AK the Hague, the Netherlands, ORCID: 0000-0003-4199-4374.
c)
ORCID: 0000-0002-2297-4370.
d)
ORCID: 0000-0002-9891-4374.
e)
Also at: Department of Biomedical Engineering, Thorax Center, Erasmus MC, 3015 GD Rotterdam, the Netherlands.
f)
ORCID: 0000-0001-8902-0099.
g)
ORCID: 0000-0002-7441-7218.
J. Acoust. Soc. Am. 147, 2670–2681 (2020)
Article history
Received:
December 11 2019
Accepted:
April 06 2020
Citation
Jack Massaad, Paul L. M. J. van Neer, Douwe M. van Willigen, Michiel A. P. Pertijs, Nicolaas de Jong, Martin D. Verweij; Suppression of Lamb wave excitation via aperture control of a transducer array for ultrasonic clamp-on flow metering. J. Acoust. Soc. Am. 1 April 2020; 147 (4): 2670–2681. https://doi.org/10.1121/10.0001135
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