DOI QR코드

DOI QR Code

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;Lim, Yeong Eun;Park, Keun;Ra, Seung Woo
이지원;임영은;박근;나승우

  • Received : 2016.02.15
  • Accepted : 2016.04.24
  • Published : 2016.06.03

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

Vision inspection;Annular optical system;Omnidirectional inspection;External screw threads;Ray tracing

References

  1. Kim, J. W., Song, T. H., and Ha, J. E., "Measurement of 3D Shape of Fastener Using Camera and Slit Laser," J. Korean Soc. Precis. Eng., Vol. 32, No. 6, pp. 537-542, 2015. https://doi.org/10.7736/KSPE.2015.32.6.537
  2. Malamas, E. N., Petakis, E. G. M., Zervakis, M., Petit, L., Legat, J.-D., et al., "A Survey on Industrial Vision Systems, Applications, and Tools," Image and Vision Computing, Vol. 21, No. 2, pp. 171-188, 2003. https://doi.org/10.1016/S0262-8856(02)00152-X
  3. Park, Y. S. and Kim, J. S., "A Study on the Vision Inspection System for the Defects Detection of Micro-BGA Device," J. Korean Soc. Precis. Eng., Vol. 24, No. 4, pp. 44-56, 2007.
  4. Moon, C. I., Choi, S. H., Joo, W. J., Kim, G. B., Kim, C. H., et al., "Development of a Neural Network Classifier for the Classification of Surface Defects of Cold Rolled Strip," J. Korean Soc. Precis. Eng., Vol. 24, No. 4, pp. 76-83, 2007.
  5. Zhou, F. and Zhang, G., "Complete Calibration of a Structured Light Stripe Vision Sensor through Planar Target of Unknown Orientations," Image and Vision Computing, Vol. 23, No. 1, pp. 59-67, 2005. https://doi.org/10.1016/j.imavis.2004.07.006
  6. Hunsicker, R. J., Patten, J., Ledford, A., Ferman, C., Allen, M., Ellis, C., et al., "Automatic Vision Inspection and Measurement System for External Screw Threads," Journal of Manufacturing Systems, Vol. 13, No. 5, pp. 370-384, 1994. https://doi.org/10.1016/0278-6125(94)P2586-4
  7. Baek, S. B., Lee, K. Y., Joo, W. J., Park, K., Ra, S. W., et al., "Improvement of the Optical Characteristics of Vision System for Precision Screws Using Ray Tracing Simulation," J. Korean Soc. Precis. Eng., Vol. 28, No. 9, pp. 1194-1102, 2011.
  8. Park, K., Lee, C. H., and Ra, S. W., "Optical Simulation of Omnidirectional Inspection System for Screw Threads," Key Engineering Materials, Vol. 625, pp. 706-711, 2015.
  9. Ishiguro, H., "Development of Low-Cost Compact Omnidirectional Vision Sensors and their Applications," Proc. of International Conference on Information System, Analysis and Synthesis, pp. 433-439, 1998.
  10. Bae, K., Park, K. R., and Kim, J., "Tracking Head Positions in Three-Dimensional Space by Using a Single Omnidirectional Camera," Optical Engineering, Vol. 47, No. 4, pp. 047205-047213, 2008. https://doi.org/10.1117/1.2909667
  11. Lee, C. H., Lim. Y. E., Park, K., and Ra, S. W., "Design and Analysis of Illumination Optics for Image Uniformity in Omnidirectional Vision Inspection System for Screw Threads," J. Korean Soc. Precis. Eng., Vol. 31, No. 3, pp. 261-268, 2014. https://doi.org/10.7736/KSPE.2014.31.3.261
  12. OPTO Engineering, "Catadioptric Lenses for $360^{\circ}$ Inspection," http://www.opto-engineering.com/products/pccd-catadioptric-lenses.html (Accessed 20 May 2016)
  13. OPTIS Software, "Reference Manual - SPEOS 2003," 2003.

Acknowledgement

Supported by : 중소기업청