Título:
Strain sensitivity enhancement of broadband ultrasonic signals in plates using spectral phase filtering.
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Autor:
Martinho, Lucas M.
Kubrusly, Alan Conci
Pérez Alvarez, Nicolás
von der Weid, Jean Pierre
Kubrusly, Alan Conci
Pérez Alvarez, Nicolás
von der Weid, Jean Pierre
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Tipo de documento:
Artículo
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Palabras clave:
Strain monitoring
Ultrasonic guided waves signals
Time-reversal
Cross-correlation
Filtering
Time-frequency analysis
Ultrasonic guided waves signals
Time-reversal
Cross-correlation
Filtering
Time-frequency analysis
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Año de publicación:
2021
Contenido:
Resumen:
The focused signal obtained by the time-reversal or the cross-correlation techniques of ultrasonic guided waves in plates changes when the medium is subject to strain, which can be used to monitor the medium strain level. In this paper, the sensitivity to strain of cross-correlated signals is enhanced by a post-processing filtering procedure aiming to preserve only strain-sensitive spectrum components. Two different strategies were adopted, based on the phase of either the Fourier transform or the short-time Fourier transform. Both use prior knowledge of the system impulse response at some strain level. The technique was evaluated in an aluminum plate, effectively providing up to twice higher sensitivity to strain. The sensitivity increase depends on a phase threshold parameter used in the filtering process. Its performance was assessed based on the sensitivity gain, the loss of energy concentration capability, and the value of the foreknown strain. Signals synthesized with the time–frequency representation, through the short-time Fourier transform, provided a better tradeoff between sensitivity gain and loss of energy concentration.
Descripción:
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MDPI
EN:
Applied Sciences, vol. 11, no 6, 2582, p. 1-15, Mar. 2021
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Citación:
Martinho, L., Kubrusly, A., Pérez Alvarez, N. y otros. "Strain sensitivity enhancement of broadband ultrasonic signals in plates using spectral phase filtering". Applied Sciences. [en línea]. 2021, vol. 11, no 6, 2582, pp. 1-15. DOI: 10.3390/app11062582
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ISSN:
2076-3417
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Licencia:
Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| MKPV21.pdf | Versión publicada | 1.59 MB | Adobe PDF |