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Proceedings Paper

Freeform lens design to achieve 1000X solar concentration with a parabolic trough reflector
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Paper 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 Kӧhler 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.

Paper Details

Date Published: 17 December 2014
PDF: 5 pages
Proc. SPIE 9293, International Optical Design Conference 2014, 929316 (17 December 2014); doi: 10.1117/12.2076091
Show Author Affiliations
Brian M. Wheelwright, College of Optical Sciences, The Univ. of Arizona (United States)
Roger Angel, College of Optical Sciences, The Univ. of Arizona (United States)
Steward Observatory (United States)
REhnu Inc. (United States)
Blake Coughenour, College of Optical Sciences, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 9293:
International Optical Design Conference 2014
Mariana Figueiro; Scott Lerner; Julius Muschaweck; John Rogers, Editor(s)

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