Irradiance redistribution guide

摘要

An irradiance redistribution guide (IRG) for providing from a radiation source having a nonuniform irradiation distribution, a predetermined irradiance distribution over a predetermined target area spaced away from the IRG. The IRG includes a tubular reflective inner surface disposed between an entrance aperture and an exit aperture. The reflective inner surface has a varying cross-sectional radius. The profile of the cross-sectional radius is defined by a spline function that is uniquely determined by a plurality of knots. The IRG, when used in conjunction with a high-power solar concentrator, is advantageous in materials processing that requires high irradiance level that is uniformly distributed over an area spaced away from the exit aperture by a working distance.