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Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models

by Admin on Sep 29, 2014
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http://www.dbpia.co.kr/Journal/ArticleDetail/3206728


한국비파괴검사학회 > 비파괴검사학회지 > 비파괴검사학회지 제33권 제3호


Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models

- Gaussian and Square-Like

Sungho Choi, Kyung-Young Jhang식별저자
영어 초록
  Acoustic nonlinearity of surface waves is an effective method to evaluate the micro damage on the surface of materials. In this method, the A₁ (magnitude of the fundamental wave) and A₂ (magnitude of the second-order harmonic wave) are measured for evaluation of acoustic nonlinearity. However, if there is another source of second-order harmonic wave other than the material itself, the linear relationship between A₁² and A₂ will not be guaranteed. Therefore, the second-order harmonic generation by another source should be fully suppressed. In this paper, we investigated the initial second-order harmonic generation in narrowband surface waves by multi-line laser beams. The spatial profile of laser beam was considered in the cases of Gaussian and square-like. The temporal profile was assumed to be Gaussian. In case of Gaussian spatial profile, the generation of the initial second-order harmonic wave was inevitable. However, when the spatial profile was square-like, the generation of the initial second-order harmonic wave was able to be fully suppressed at specific duty ratio. These results mean that the multi-line laser beams of square-like profile with a proper duty ratio are useful to evaluate the acoustic nonlinearity of the generated surface waves.
목차
Abstract
1. Introduction
2. Generation of Narrowband Laser-Generated Surface Waves
3. Numerical Analysis of Spectrum H(f)
4. Simulation Results and Discussion
5. Conclusions
References
키워드
Laser, Surface Waves, Acoustic Nonlinearity, Initial Second-Order Harmonic
상세서지
  • 발행기관 : 한국비파괴검사학회
  • 자료유형 : 전자저널 논문
  • 등재정보 : KCI 등재
  • 작성언어 : 영어
  • 파일형식 : Text PDF
  • KORMARC 보기
  • URL : http://www.dbpia.co.kr/Article/3206728 복사 즐겨찾기로 추가

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