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논문 기본 정보

자료유형
학술저널
저자정보
Hogeon Seo (Hanyang University) Myunghwan Kim (Hanyang University) Sungho Choi (Graduate School of Hanyang University) Chung Seok Kim (Hanyang University) Kyung-Young Jhang (Hanyang University)
저널정보
한국비파괴검사학회 비파괴검사학회지 비파괴검사학회지 제32권 제4호
발행연도
2012.8
수록면
347 - 354 (8page)

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Using a single-line pulsed laser beam is well known as a useful noncontact method to generate a directional surface acoustic wave. In this method, different laser beam energy profiles produce different waveforms and frequency characteristics. In this paper, we considered two typical kinds of laser beam energy profiles, Gaussian and square-like, to find out a difference in the frequency characteristics. To achieve this, mathematical models were proposed first for Gaussian laser beam profile and square-like respectively, both of which depended on the laser beam width. To verify the theoretical models, experimental setups with a cylindrical lens and a line-slit mask were respectively designed to produce a line laser beam with Gaussian spatial energy profile and square-like. The frequency responses of the theoretical models showed good agreement with experimental results in terms of the existence of harmonic frequency components and the shift of the first peak frequencies to low.

목차

Abstract
1. Introduction
2. Basic Theories of Surface Wave Generation
3. Simulations
4. Experiments
5. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2014-500-003271590