Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Development of Annular Optics for the Inspection of Surface Defects on Screw Threads Using Ray Tracing Simulation

광선추적을 사용한 나사산 표면결함 검사용 환형 광학계 개발

  • Lee, Jiwon (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Lim, Yeong Eun (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Park, Keun (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Ra, Seung Woo (Research Center, Seoul Metal Co., Ltd.)
  • 이지원 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 임영은 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 박근 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 나승우 (서울금속(주) 기술연구소)
  • Received : 2016.02.15
  • Accepted : 2016.04.24
  • Published : 2016.06.03
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Abstract

This study aims to develop a vision inspection system for screw threads. To inspect external defects in screw threads, the vision inspection system was developed using front light illumination from which bright images can be obtained. The front light system, however, requires multiple side images for inspection of the entire thread surface, which can be performed by omnidirectional optics. In this study, an omnidirectional optical system was designed to obtain annular images of screw threads using an image sensor and two reflection mirrors; one large concave mirror and one small convex mirror. Optical simulations using backward and forward ray tracing were performed to determine the dimensional parameters of the proposed optical system, so that an annular image of the screw threads could be obtained with high quality and resolution. Microscale surface defects on the screw threads could be successfully detected using the developed annular inspection system.

Keywords

References

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