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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) Sung-Hoon Cho (E-Hwa Industrial) Yong Gyu Choi (Korea Aerospace University)
저널정보
한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.3 No.5
발행연도
2019.10
수록면
415 - 422 (8page)

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초록· 키워드

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Retroreflection of vehicle headlights, as induced by spherical glass beads, is a key optical phenomenon that provides road-surface markings with greatly enhanced visibility, thus better securing a driver’s safety in the nighttime as well as in unclear daytime. Retroreflectance of glass beads is a quite sensitive function of their refractive index, so that measurement of the refractive index of glass specifically in the shape of spherical beads needs to be performed within a reasonable uncertainty that is tolerable for road-marking applications. The Becke line method has been applied in assessing refractive index of such glass beads as e.g. an industrial standard in the Republic of Korea; however, the reference refractive-index liquids are not commercially available these days for refractive index greater than 1.80 due to the toxicity of the constituent materials. As such, high-refractive-index glass beads require an alternate method, and in this regard we propose a practically serviceable technique with uncertainty tantamount to that of the Becke line method: Based on comparison of calculated and measured retroreflectance values of commercial glass beads, we discover that their refractive index can be determined with reasonable precision via the retroreflectance measurement. Specifically, in this study the normalized retroreflectance originating from a single glass sphere is computed as a function of refractive index using the Fresnel equations, which is then validated as coinciding well with retroreflectance values measured from actual specimens, i.e. glass-bead aggregates. The uncertainties involved are delineated in connection with radius and imperfections of the glass beads.

목차

I. INTRODUCTION
II. MATERIALS AND METHODS
III. CALCULATION OF THE RETRO-REFLECTANCE OF A GLASS BEAD
IV. COMPARISON BETWEEN THE CALCULATED AND MEASURED RETROREFLECTANCE VALUES
V. EVALUATION OF REFRACTIVE INDEXUSING MEASURED RETROREFLECTANCE
VI. SUMMARY
REFERENCES

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