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Volume 19
Issue 6
10.3390/s19061391
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Article

On the Use of Oblique Acoustic Leakage to Measure the Wavenumber Spectrum of Propagating Lamb Waves

by
Christopher Hakoda
*,
Mostafa Hasanian
and
Cliff J. Lissenden
Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(6), 1391; https://doi.org/10.3390/s19061391
Submission received: 5 February 2019 / Revised: 7 March 2019 / Accepted: 19 March 2019 / Published: 21 March 2019
(This article belongs to the Section Physical Sensors)
Versions Notes

Abstract

Lamb waves propagating within a waveguide often have similar frequency content. If there are multiple Lamb wave modes with the same frequency content, the wavenumber spectrum can be used to distinguish between them. As a result, the wavenumber spectrum is an important tool for determining the modal content of signals. In this paper, we propose a new method for measuring wavenumber spectra that uses an air-coupled transducer for reception and Snell’s law instead of a fast-Fourier transform. The method employs an angular scan rather than a translational scan. The advantages and disadvantages of the method are discussed along with some suggestions for potential improvements. Finally, experimental results comparing the proposed method to a more conventional method, which used a PVDF transducer, demonstrate the feasibility of the proposed method.
Keywords: air-coupled transducer; Lamb waves; 2DFFT; wavenumber spectrum; Snell’s law; slowness curves air-coupled transducer; Lamb waves; 2DFFT; wavenumber spectrum; Snell’s law; slowness curves

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MDPI and ACS Style

Hakoda, C.; Hasanian, M.; Lissenden, C.J. On the Use of Oblique Acoustic Leakage to Measure the Wavenumber Spectrum of Propagating Lamb Waves. Sensors 2019, 19, 1391. https://doi.org/10.3390/s19061391

AMA Style

Hakoda C, Hasanian M, Lissenden CJ. On the Use of Oblique Acoustic Leakage to Measure the Wavenumber Spectrum of Propagating Lamb Waves. Sensors. 2019; 19(6):1391. https://doi.org/10.3390/s19061391

Chicago/Turabian Style

Hakoda, Christopher, Mostafa Hasanian, and Cliff J. Lissenden. 2019. "On the Use of Oblique Acoustic Leakage to Measure the Wavenumber Spectrum of Propagating Lamb Waves" Sensors 19, no. 6: 1391. https://doi.org/10.3390/s19061391

APA Style

Hakoda, C., Hasanian, M., & Lissenden, C. J. (2019). On the Use of Oblique Acoustic Leakage to Measure the Wavenumber Spectrum of Propagating Lamb Waves. Sensors, 19(6), 1391. https://doi.org/10.3390/s19061391

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