Journal of Welding and Joining

  • 제17권6호
  • /
  • Pages.100-107
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  • 1999
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  • 2466-2232(pISSN)
  • /
  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
권호 표지

웨이브렛 평면 AR 모델을 이용한 초음파 비파괴 검사의 스펙클 잡음 감소 및 결함 검출

Speckle Noise Reduction and Flaw Detection of Ultrasonic Non-destructive Testing Based on Wavelet Domain AR Model

  • 이영석 (청운대학교 전자공학과) ;
  • 임래묵 (서울시립대학교 전자전기공학부) ;
  • 김덕영 (서울시립대학교 전자전기공학부) ;
  • 신동환 (서울시립대학교 전자전기공학부) ;
  • 김성환 (서울시립대학교 전자전기공학부)
  • 발행 : 1999.12.01
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초록

In this paper, we deal with the speckle noise reduction and parameter estimation of ultrasonic NDT(non-destructive test) signals obtained during weld inspection of piping. The overall approach consists of three major steps, namely, speckle noise analysis, proposition of wavelet domain AR(autoregressive) model and flaw detection by proposed model parameter. The data are first processed whereby signals obtained using vertical and angle beam transducer. Correlation properties of speckle noise are then analyzed using multiresolution analysis in wavelet domain. The parameter estimation curve obtained using the proposed model is classified a flaw in weld region where is contaminated by severe speckle noise and also clear flaw signal is obtained through CA-CFAR threshold estimator that is a nonlinear post-processing method for removing the noise from reconstructed ultrasonic signal.

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참고문헌

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