Light Spread in a Light Beam by a Diffuser

Abstract

Lamps that include optical systems, such as reflector lamps, often show uneven light distribution.
This light distribution unevenness can be prevented by adding a slight diffusing function to the reflector or its window. However, even if, two samples appear to have same outward diffusing grade, for example chemically etched frosted glass and white powder coated glass, they often show absolutely different light distribution.
Therefore, it is necessary to measure and control the diffusion optical characteristics.
An easy method to measure the diffused light distribution grade was investigated.
The light distribution caused by light refracted from, or reflected by chemicallyetched frosted glass lit by a parallel beam was found to be similar to Gauss distribution.
One method of calculating the diffused light distribution is to place another diffusing glass plate into the diffused light field from the light source.