5 September 2014 Decentralized nonimaging micro-optical concentrator
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Abstract
A novel non-imaging micro-concentrator concept and its development in Sandia National Lab’s microsystems-enabled photovoltaics (MEPV) program are described in this paper. Key notions of the compact 2-element optical concentrator are toroidal lens surfaces that decentralize the focused beam and a reflective cone structure that enhances light collection and illumination onto micro-scale solar cells (e.g., ~100’s microns in diameter). The optical configuration therefore provides a low-intensity, hot-spot-free illumination pattern on the receiver while achieving a concentration-acceptance angle product (CAP) over 1. Designs taking into account practical factors (such as fabrication capabilities, misalignments) achieve a 400X geometric concentration with a ±2.4° (90% of peak) acceptance angle (CAP = 0.84) and a 600X geometric concentration with a ±2° acceptance angle (CAP = 0.85), allowing low cost, mass production using injection molding. Development and experimental evaluation of a baseline prototype module is also described.
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Tian Gu, William C. Sweatt, Gautam Agrawal, Bradley H. Jared, Ben J. Anderson, Ron S. Goeke, Brenton Elisberg, Scott M. Paap, Jose Luis Cruz-Campa, Vipin Gupta, Murat Okandan, Gregory N. Nielson, Michael W. Haney, "Decentralized nonimaging micro-optical concentrator", Proc. SPIE 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI, 91910G (5 September 2014); doi: 10.1117/12.2062286; https://doi.org/10.1117/12.2062286
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