Developed a code to analyze transmittance of 2D mirror light pipe (MLP). The code was used to simulate light traveling through a highly reflective two dimensional pipe, where a fraction of the photons' energy is absorbed with each reflection. Diffuse surfaces were modeled using the monte-carlo (MC) method, where new directions were sampled. The pursuit of a given photon ends when one of three things happen: the photon's energy decreases below a prescribed tolerance, the photon leaves through the entrance, or exit. Results were validated with literature and transmittance values were analyzed for several geometries, including an elliptical shaped MLPs.
Ray traces through a circular cross section MLP. All reflections are specular (highly reflective surface):
Validation with experiment across several aspect ratios including theoretical, experimental and MC simulation:
Transmittance for a parametric sweep across incident irradiation angle and aspect ratio.