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Hybrid Illumination System Design based on Illuminance Uniformity for Surface Inspection  

Cho, Eun Deok (Graduate school, Korea National University of Transportation)
Kim, Gyung Bum (Aeronautical & Mechanical Design Engineering, Korea National University of Transportation)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.3, 2019 , pp. 60-65 More about this Journal
Abstract
In this paper, the hybrid illumination system for effectively detecting surface defects in steel plate with lowcontrast, non-uniformity and featureless is designed based on illuminance uniformity. First of all, characteristics of steel plate defects were considered and typical inspection illumination system is implemented. Optimum illumination parameters for uniformly illuminating an inspection area in the typical illumination system are selected based on the illuminance uniformity and illuminance distribution measurement. The illuminance uniformity and illuminance distribution are measured using an illuminometer based on the arduino. Through illuminance distribution analysis of the typical illumination, an hybrid illumination is designed by fusing bi-directional illumination and coaxial illumination. The hybrid illumination showed higher uniformity ratio and illuminance distribution than the typical illuminations. The hybrid illumination system showed the ability to uniformly illuminate the entire inspection region of steel plate surface.
Keywords
Hybrid Illumination System; Illuminance Uniformity; Surface Defect; Surface Inspection;
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