Abstract
Indirect illumination with light-emitting diodes (LEDs) and diffusers is widely applied in
various fields that require uniform illumination. In this paper, a design of diffuse reflection
freeform surface is proposed. Based on the Lambertian characteristic of LEDs and ideal diffuse
surface, a mathematical model is developed. Nonlinear algebraic equations are established by
redistributing the energy emitted from LEDs to the illuminated scene for uniform illumination.
Solving these equations numerically, the outline of the diffuse surface is obtained. Finally, by
using ray tracing software TracePro, the simulation result shows that the irradiance uniformity of
the detection plane is above 95% with high accepted tolerance.
© 2013 IEEE
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