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http://dx.doi.org/10.7736/KSPE.2016.33.6.491

Development of Annular Optics for the Inspection of Surface Defects on Screw Threads Using Ray Tracing Simulation  

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.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.33, no.6, 2016 , pp. 491-497 More about this Journal
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;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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