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논문 기본 정보

자료유형
학술저널
저자정보
Sang Yeol Shin (Korea Aerospace University) Ji In Lee (Korea Aerospace University) Woon Jin Chung (Kongju National University) Yong Gyu Choi (Korea Aerospace University)
저널정보
한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.3 No.5
발행연도
2019.10
수록면
423 - 428 (6page)

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초록· 키워드

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Visibility of road-surface markings is one of the critical issues that should be secured for self-driving cars as well as human drivers. Glass beads are taking on the role of retroreflectors, and therefore are considered a necessity in modern pavements. In this context, retroreflectance is sensitively dependent not only on the refractive index of glass beads but also on that of the surrounding medium. This implies that the optimum refractive index of glass beads immersed in water, i.e. under wet conditions, is different from that of glass beads surrounded by air, i.e. under dry conditions. A refractive index of approximately 1.9, which is known to maximize retroreflectance under dry conditions, actually exhibits much poorer retroreflectance under wet conditions. This suggests that glass beads with optimal refractive index for wet conditions need to be installed together with those for dry conditions. We propose a facile but practical model capable of calculating retroreflectance of glass beads surrounded by an arbitrary medium, here water in particular, and experimentally verify its capability of assessing the refractive index of commercial glass beads. Changes in retroreflectance according to the mixing ratio of glass beads with different refractive indices are also discussed, in an effort to propose the proper use of glass beads produced for dry and wet conditions.

목차

I. INTRODUCTION
II. MATERIALS AND METHODS
III. CALCULATION OF THE RETROREFLECTANCE OF A GLASS BEAD UNDER WET CONDITIONS
IV. ASSESSING REFRACTIVE INDEX OF GLASS BEADS USING RETROREFLECTANCE
V. MIXING-RATIO DEPENDENCE OF RETROREFLECTANCE
VI. SUMMARY
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