비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제32권6호
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  • Pages.696-702
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  • 2012
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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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Rail Inspection Using Noncontact Laser Ultrasonics

  • Kim, Nak-Hyeon (Department of Civil and Environmental Engineering, KAIST) ;
  • Sohn, Hoon (Department of Civil and Environmental Engineering, KAIST) ;
  • Han, Soon-Woo (Korea Railroad Research Institute)
  • 투고 : 2012.11.07
  • 심사 : 2012.12.07
  • 발행 : 2012.12.30
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초록

In this study, a noncontact laser ultrasonic system is proposed for rail defect detection. An Nd-Yag pulse laser is used for generation of ultrasonic waves, and the corresponding ultrasonic responses are measured by a laser Doppler vibrometer. For the detection of rail surface damages, the shape of the excitation laser beam is transformed into a line. On the other hand, a point source laser beam is used for the inspection of defects inside a rail head. Then, the interactions of propagating ultrasonic waves with defects are examined using actual rail specimens. Amplitude attenuation was mainly observed for a surface crack, and reflections were most noticeable from an internal damage. Finally, opportunities and challenges associated with real-time rail inspection from a high-speed train are discussed.

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참고문헌

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