비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제36권2호
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  • Pages.112-120
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  • 2016
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
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Diffraction Corrections for Second Harmonic Beam Fields and Effects on the Nonlinearity Parameter Evaluation

  • Jeong, Hyunjo (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Cho, Sungjong (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Nam, Kiwoong (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Lee, Janghyun (Division of Mechanical and Automotive Engineering, Wonkwang University)
  • 투고 : 2016.02.05
  • 심사 : 2016.04.05
  • 발행 : 2016.04.30
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초록

The nonlinearity parameter is frequently measured as a sensitive indicator in damaged material characterization or tissue harmonic imaging. Several previous studies have employed the plane wave solution, and ignored the effects of beam diffraction when measuring the non-linearity parameter ${\beta}$. This paper presents a multi-Gaussian beam approach to explicitly derive diffraction corrections for fundamental and second harmonics under quasilinear and paraxial approximation. Their effects on the nonlinearity parameter estimation demonstrate complicated dependence of ${\beta}$ on the transmitter-receiver geometries, frequency, and propagation distance. The diffraction effects on the non-linearity parameter estimation are important even in the nearfield region. Experiments are performed to show that improved ${\beta}$ values can be obtained by considering the diffraction effects.

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참고문헌

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피인용 문헌

  1. An Efficient and Accurate Method for Calculating Nonlinear Diffraction Beam Fields vol.36, pp.2, 2016, https://doi.org/10.7779/JKSNT.2016.36.2.102