Transcription of UNDERSTANDING RETROREFLECTIVITY A brief …
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UNDERSTANDING RETROREFLECTIVITY A brief …
UNDERSTANDING RETROREFLECTIVITY2 DESIGNING SAFER ROADSIDESA brief history ofretroreflective sign facesheet materialsTHE PRINCIPLES OF RETROREFLECTIONR etroreflection (reflecting light back towards its source)uses three basic principles:a)specular reflection (as from a mirror or highlypolished surface)b)refraction (the change in direction of light as it passesfrom one medium to another eg air to glass)c)total internal reflection (where light hitting thesurface of a transparent material at certain anglesbounces off the surface rather than passing throughit). These principles have been well understood forhundreds of years and have been employed by everyjeweller who has cut and polished a gemstone. But insteadof creating multiple reflected beams, retroreflectors aredesigned to reflect only a beam of light back along thesame path as the incoming beam. There are two basicoptical systems of RETROREFLECTIVITY and these are shown inFigure Glass Sphere or BeadThe simplest retroreflector is a glass sphere or bead.
UNDERSTANDING RETROREFLECTIVITY 2 DESIGNING SAFER ROADSIDES A brief history of retroreflective sign face sheet materials THE PRINCIPLES OF RETROREFLECTION Retroreflection (reflecting light back towards its source)
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