Light Management

Simple Köhler homogenizers for image-forming solar concentrators

[+] Author Affiliations
Roland Winston

University of California Merced, School of Natural Science, 5200 N. Lake Road, Merced, California 95343

University of California Merced, School of Engineering, 5200 N. Lake Road, Merced, California 95343

Weiya Zhang

University of California Merced, School of Engineering, 5200 N. Lake Road, Merced, California 95343

J. Photon. Energy. 1(1), 015503 (March 21, 2011). doi:10.1117/1.3565187
History: Received August 15, 2010; Revised January 15, 2011; Accepted February 22, 2011; Published March 21, 2011; Online March 21, 2011
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Image-forming solar concentrators which project an image of the sun on the photovoltaic cell may have high thermodynamic efficiency, but suffer from non-uniform irradiance distribution and a nonsquare irradiance pattern. In this paper we discuss how to apply the Köhler illumination technique to solve these problems with an optimization approach. Two examples, a Fresnel lens-based concentrator and a two-mirror aplanatic system, are shown for demonstration. The uniformity of these systems is greatly improved by adding simple Köhler homogenizers in the form of aspheric lenses generated with our approach.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Roland Winston and Weiya Zhang
"Simple Köhler homogenizers for image-forming solar concentrators", J. Photon. Energy. 1(1), 015503 (March 21, 2011). ; http://dx.doi.org/10.1117/1.3565187


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