Application of scanning laser source technique for nondestructive flaw detection

Sang Woo Choi*, Joon Hyun Lee, An Jin Nam, Sridhar Krishnaswamy

*Corresponding author for this work

Research output: Contribution to journalConference article

5 Scopus citations


During the last two decades, significant advances in the field of laser generated ultrasounds have been made. In the conventional pulse echo technique, a discontinuity in the specimen can be detected only if an ultrasonic detector is properly oriented to the discontinuity. The 2-D Scanning Laser Source (SLS) technique allows detection of surface-breaking cracks of arbitrary orientation with respect to the direction. This technique also makes detection possible on rough and curved surfaces by scanning changes in ultrasonic amplitude and frequency when the laser source scans over flaws. Conventional ultrasonic scanning technique requires immersion of specimen or water jet for transferring ultrasonic wave between transducer and specimen. However, this SLS technique does not need contacting and couplant to generate surface wave and to get flaw images. Therefore, this SLS technique has several advantages, for complicated production inspection, high speed scanning, non-contact, remote from specimen, and high resolution. In this study, ultrasonic SLS images of fatigue cracks on turbine blade of aircraft and steel plates were obtained to describe shapes of defects by SLS technique.

Original languageEnglish (US)
Pages (from-to)787-792
Number of pages6
JournalKey Engineering Materials
Issue numberI
StatePublished - Jan 1 2004
EventProceedings of the 11th Asian Pacific Conference on Nondestructive Testing - Jeju Island, Korea, Republic of
Duration: Nov 3 2003Nov 7 2003


  • Crack
  • Image
  • Laser-generated ultrasound
  • Nondestructive evaluation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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