Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Ultrasonic Backscattering on Painted Rough Surface at near Rayleigh Angle

레일리각 근처에서 도색된 거친 표면으로부터 후방 산란된 초음파

  • 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)
  • Published : 2004.02.28
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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.

[ $1.71{\mu}m$ ] 범위의 표면 거칠기를 가진 철 시편에 대해 물속에서 후방산란된 초음파의 입사각 의존성(프로파일)이 측정되었다. 거칠기가 도색에 의해 숨겨졌을 때 수직 프로파일은 거칠기에 대한 분별력이 사라졌으나 레일리 각 근처에서의 후방산란 프로파일은 거칠기 의존성을 여전히 보여주었다. 레일리 각에서 직접 복사된 프로파일 세기는 거칠기와 비례하였고 코너에서 반사되어 되돌아오는 표면파로부터의 후방복사의 세기는 거칠기와 반비례하였다. 도색 처리된 시편에서 0.03 파장 이하의 직접 후방복사에서도 선형성이 관찰되었고 주기적 거칠기에 의해 발생한 비정상 저면 다중반사 현상이 사라졌다.

Keywords

References

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