Abstract
Illumination uniformity and color mixing results are essential
for color vision applications. In this paper, an indirect method is proposed
for the uniform illumination, and a mathematically simulated algorithm is
developed. We integrate the method of light-emitting diode (LED) array and
diffuse reflection surface for uniform illumination system. By considering
each single LED as an imperfect Lambertian emitter, we discuss the
irradiance distribution over a sphere's inner surface to the three-ring LED
array. The sphere's inner surface is a diffuse reflection surface with high
hemisphere reflectance. Using the bi-directional reflectance distribution
functions (BRDF) of the sphere's inner surface, we simulate the uniformity
of the LED illumination at varying distances. Finally, we design a practical
LED illumination. The uniformity of practical LED illumination agrees with
the simulated result. The results demonstrate the usefulness of this method
for uniform illumination design.
© 2011 IEEE
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