Abstract

The light-pipe efficiency or fraction of the incident energy transmitted from one end to the other is expressed as a function of the wall reflectivity ρ and geometrical parameters. Light pipes with both circular and rectangular cross sections are considered. The analysis includes skew rays and is mathematically exact within the limits of geometrical optics and a constant specular wall reflectivity. The distribution along the light pipe of the average intensity incident upon the walls is also derived.

© 1974 Optical Society of America

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