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Effect of geometrical diffraction on non-contact measurements of ultrasonic attenuation in cement-based materials
In order to study the relationship between ultrasonic parameters and material properties in cement-based materials, attenuation measurements of ultrasonic Rayleigh waves have been performed using a pair of air-coupled transducers. Not only does measured attenuation display a considerable spatial dispersion, but attenuation is underestimated since several measurements yield non-physical, negative values. A possible explanation for this bias is the effect of geometrical diffraction in the near-field of the transducers. In this paper, this hypothesis is tested. The amplitude decay of transmitted Rayleigh waves is measured both in mortar specimens and in a reference, lossless material. The curves obtained from the reference material are used to compensate for geometrical diffraction and allow to recover in most cases positive attenuation values.
Effect of geometrical diffraction on non-contact measurements of ultrasonic attenuation in cement-based materials
In order to study the relationship between ultrasonic parameters and material properties in cement-based materials, attenuation measurements of ultrasonic Rayleigh waves have been performed using a pair of air-coupled transducers. Not only does measured attenuation display a considerable spatial dispersion, but attenuation is underestimated since several measurements yield non-physical, negative values. A possible explanation for this bias is the effect of geometrical diffraction in the near-field of the transducers. In this paper, this hypothesis is tested. The amplitude decay of transmitted Rayleigh waves is measured both in mortar specimens and in a reference, lossless material. The curves obtained from the reference material are used to compensate for geometrical diffraction and allow to recover in most cases positive attenuation values.
Effect of geometrical diffraction on non-contact measurements of ultrasonic attenuation in cement-based materials
Einfluss geometrischer Beugung auf berührungslose Messungen der Ultraschallschwächung in zementbasierten Werkstoffen
Goueygou, Marc (author) / Soltani, Fethi (author) / Lafhaj, Zoubeir (author) / Piwakowski, Bogdan (author)
2009
6 Seiten, 4 Bilder, 1 Tabelle, 5 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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