@inproceedings{4c35d84bbbaa4e1f8c7af5dc7bef5344,
title = "Freeform lens design to achieve 1000X solar concentration with a parabolic trough reflector",
abstract = "Line-focus parabolic trough mirrors for solar thermal generation cannot produce the high concentration required for concentrating photovoltaic (CPV) systems. We describe a freeform lens array with toroidal symmetry which intercepts the low-concentration line focus to produce a series of elongated, high-concentration foci. The design employs 2D K.hler illumination to improve the acceptance angle in one direction. The two-stage concentrator has 1000X average geometric concentration with an acceptance angle of +/-1.49° in the azimuthal direction and +/-0.29° in the elevation direction. Preliminary results of a prototype roll-forming process are shown in thermoplastics and B270 glass.",
keywords = "Concentrators, Freeform, Nonimaging optics, Parabolic trough, Solar energy",
author = "Brian Wheelwright and Roger Angel and Blake Coughenour",
note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; International Optical Design Conference 2014, IODC 2014 ; Conference date: 23-06-2014 Through 26-06-2014",
year = "2014",
doi = "10.1117/12.2076091",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Mariana Figueiro and Julius Muschaweck and Scott Lerner and John Rogers",
booktitle = "International Optical Design Conference 2014",
}