Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Development of Self-compensated Technique for Evaluation of Surface-breaking Crack by Using Laser Based Ultrasound

  • Choi, Sang-Woo (Research Institute of Mechanical Technology, Pusan National University) ;
  • Lee, Joon-Hyun (School of Mechanical Engineering, Pusan National University) ;
  • Cho, Youn-Ho (School of Mechanical Engineering, Pusan National University)
  • Published : 2005.06.30
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Abstract

It is required to evaluate nondestructively depth of surface-breaking cracks in structures. In this paper, the self-compensated technique by laser-based ultrasound is used to measure the depth of surface-breaking defect. Optical generation of ultrasound produces a well defined pulse with reliable frequency content. It is broad banded and suitable for measurement of attenuation and scattering over a wide frequency range. The self-calibrated signal transmission data of surface wave shows good sensitivity as a practical tool far assessment of surface-breaking defect depth. It is suggested that the relationship between the signal transmission and crack depth can be used to predict the surface-breaking crack depths in structures.

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References

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