Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Measurement of Internal Defects of Pressure Vessels using Unwrapping images in Digital Shearography

Digital Shearography 에서 Unwrapping 이미지와 FEM 을 이용한 압력용기의 내부결함 측정

  • Kim, Seong-Jong (Department of Mechanical Design,Graduate school of chonbuk Univ.) ;
  • Kang, Young-June (Department of Mechanical Design Engineering, Chonbuk Univ.) ;
  • Sung, Yeon-Hak (Department of Mechanical Design,Graduate school of chonbuk Univ.) ;
  • Ahn, Yong-Jin (Department of Mechanical Design,Graduate school of chonbuk Univ.)
  • 김성종 (전북대학교 대학원 기계설계학과) ;
  • 강영준 (전북대학교 기계설계공학부) ;
  • 성연학 (전북대학교 대학원 기계설계학과) ;
  • 안용진 (전북대학교 대학원 기계설계학과)
  • Received : 2011.07.26
  • Accepted : 2011.09.16
  • Published : 2012.01.01
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Abstract

Pressure vessels in vehicle industries, power plants, and chemical industries are often affected by flaw and defect generated inside the pressure vessels due to production processes or being used. It is very important to detect such internal defects of pressure vessel because they sometimes bring out serious problems. In this paper, an optical defect detection method using digital shearography is used. This method has advantages that the inspection can be performed at a real time measurement and is less sensitive to environmental noise. Shearography is a laser-based technique for full-field, non-contacting measurement of surface deformation (displacement or strain). The ultimate goal of this paper is to detect flaws in pressure vessels and to measure the lengths of the flaws by using unwrapping, phase images which are only obtained by Phase map. Through this method, we could decrease post-processing (next processing). Real length of a pixel can be calculated by comparing minimum and maximum unwrapping images with shearing angle. Through measuring several specimen defects which have different lengths and depths of defect, it can be possible to interpret quantitatively by calculating gray level.

Keywords

References

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