Influence Of The Angle Of Illumination On Light Scattering By Sandblasted Soda-Lime-Silica Glass

It is well known that the version of vehicle drivers is influenced by scattered light caused by damaged windshields. This is particularly produced during the night, at sunrise and sunset. This scattered light depends on various factors such as inclination angle, intensity of the light source and surface state of the windshields. The objective of our work is to study the influence of angle of illumination on light scattering by sand blasted soda-lime-silica glass. Firstly the effect of the angle of illumination and the projected sand mass until a saturation state is reached at 50 g under the chosen test conditions. In this case, the specular transmission decreases and reaches a constant value of about 18% showing the importance of scattering light. At the same time, the angle of illumination affects the optical transmission and therefore the light scattering. For an angle of 60 degrees and a sand mass of 50 g, for example, the specular transmission decreases to about 59%. Secondly we combined two parameters (the angle of illumination and the projected sand mass) to distinguish between the transparent domain and the blurred one. These domains are limited by the minimal transmission (Tmin=73%) and by the roughened (Ra) limits. The determined limits are (Ra0.51 um) for the blurred domain. Between these two limits, there is a mixed domain.