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Towards a phased array based ultrasonic polar scan : simulation study and comparison with plane wave results

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Abstract
The ever-increasing use of composite materials in the industry has resulted in the need for new, intricate approaches to not only properly characterize their anisotropic mechanical properties (i.e., the visco-elastic tensor), but also to detect various types of internal flaws. Both goals can be achieved by the Ultrasonic Polar Scan (UPS). During an UPS experiment, a material spot is insonified at many oblique incidence angles Ψ(θ,φ), with θ the vertical incident angle and φ the inplane polar angle, after which the reflected or transmitted ultrasound signal is recorded. The resulting dataset provides an integral view of the angle-dependent reflection (R) and transmission (T) scatter coefficients, and can be employed to infer the material properties. Although the current UPS scanner provides highly accurate experimental data, it is impractical for in-situ measurements. In order to create a more compact and practical measuring device, we propose the use of a hemispherical phased array, consisting of small piezoelectric elements, to generate a broadband, quasi plane wave signal. It will be shown, based on simulations, that a circular phased array concept allows for the determination of the reflection coefficients in θ − f space, from which the dispersion curves can be immediately inferred. Comparison of these results with the plane wave theoretical results show an excellent agreement.

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MLA
Daemen, Jannes, Arvid Martens, Mathias Kersemans, et al. “Towards a Phased Array Based Ultrasonic Polar Scan : Simulation Study and Comparison with Plane Wave Results.” MDPI Proceedings. Vol. 2. MDPI AG, 2018. Print.
APA
Daemen, J., Martens, A., Kersemans, M., Verboven, E., Delrue, S., Van Paepegem, W., & Van Den Abeele, K. (2018). Towards a phased array based ultrasonic polar scan : simulation study and comparison with plane wave results. MDPI Proceedings (Vol. 2). MDPI AG.
Chicago author-date
Daemen, Jannes, Arvid Martens, Mathias Kersemans, Erik Verboven, Steven Delrue, Wim Van Paepegem, and Koen Van Den Abeele. 2018. “Towards a Phased Array Based Ultrasonic Polar Scan : Simulation Study and Comparison with Plane Wave Results.” In MDPI Proceedings. Vol. 2. MDPI AG.
Chicago author-date (all authors)
Daemen, Jannes, Arvid Martens, Mathias Kersemans, Erik Verboven, Steven Delrue, Wim Van Paepegem, and Koen Van Den Abeele. 2018. “Towards a Phased Array Based Ultrasonic Polar Scan : Simulation Study and Comparison with Plane Wave Results.” In MDPI Proceedings. Vol. 2. MDPI AG.
Vancouver
1.
Daemen J, Martens A, Kersemans M, Verboven E, Delrue S, Van Paepegem W, et al. Towards a phased array based ultrasonic polar scan : simulation study and comparison with plane wave results. MDPI Proceedings. MDPI AG; 2018.
IEEE
[1]
J. Daemen et al., “Towards a phased array based ultrasonic polar scan : simulation study and comparison with plane wave results,” in MDPI Proceedings, 2018, vol. 2, no. 8.
@inproceedings{8571525,
  abstract     = {The ever-increasing use of composite materials in the industry has resulted in the need for
new, intricate approaches to not only properly characterize their anisotropic mechanical properties
(i.e., the visco-elastic tensor), but also to detect various types of internal flaws. Both goals can be
achieved by the Ultrasonic Polar Scan (UPS). During an UPS experiment, a material spot is
insonified at many oblique incidence angles Ψ(θ,φ), with θ the vertical incident angle and φ the inplane
polar angle, after which the reflected or transmitted ultrasound signal is recorded. The
resulting dataset provides an integral view of the angle-dependent reflection (R) and transmission
(T) scatter coefficients, and can be employed to infer the material properties. Although the current
UPS scanner provides highly accurate experimental data, it is impractical for in-situ measurements.
In order to create a more compact and practical measuring device, we propose the use of a
hemispherical phased array, consisting of small piezoelectric elements, to generate a broadband,
quasi plane wave signal. It will be shown, based on simulations, that a circular phased array concept
allows for the determination of the reflection coefficients in θ − f space, from which the dispersion
curves can be immediately inferred. Comparison of these results with the plane wave theoretical
results show an excellent agreement.},
  articleno    = {435},
  author       = {Daemen, Jannes and Martens, Arvid and Kersemans, Mathias and Verboven, Erik and Delrue, Steven and Van Paepegem, Wim and Van Den Abeele, Koen},
  booktitle    = {MDPI Proceedings},
  issn         = {2504-3900},
  language     = {eng},
  number       = {8},
  publisher    = {MDPI AG},
  title        = {Towards a phased array based ultrasonic polar scan : simulation study and comparison with plane wave results},
  url          = {http://dx.doi.org/10.3390/icem18-05327},
  volume       = {2},
  year         = {2018},
}

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