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Ultrasonic Backscattering on Painted Rough Surface at near Rayleigh Angle  

Kwon, Sung-D. (Department of Physics, Andong National University)
Kwon, Yong-G. (Department of Physics, Andong National University)
Yoon, Seok-S. (Department of Physics, Andong National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.24, no.1, 2004 , pp. 1-7 More about this Journal
Abstract
The angular dependence (or profile) of backscattered ultrasound was measured for steel specimens with a range of surface roughness, $1{\sim}71{\mu}m$. Backscattering profiles at or near the Rayleigh angle still showed roughness dependence while the assessment of surface roughness via normal profile became impossible due to the paint layer masking the roughness. The peak amplitude directly radiated at the Rayleigh angle was proportional to the surface roughness, while the averaged peak amplitude radiated from the backward propagating Rayleigh wave, produced by reflection at a corner, was inversely proportional. In the painted specimens, the linearity of direct backward radiation with the roughness was observed even at the roughness of less than three hundredths of a wavelength, and the abnormal multiple bark reflection caused by periodic roughness disappeared.
Keywords
ultrasound; backscattering; Rayleigh wave; surface roughness; painting;
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Times Cited By KSCI : 1  (Citation Analysis)
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