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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 22 — Aug. 1, 2000
  • pp: 3963–3967

Anamorphic concentration of solar radiation beyond the one-dimensional thermodynamic limit

Nir Davidson, Lev Khaykovich, and Erez Hasman  »View Author Affiliations


Applied Optics, Vol. 39, Issue 22, pp. 3963-3967 (2000)
http://dx.doi.org/10.1364/AO.39.003963


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Abstract

We propose and demonstrate a new scheme for anamorphic concentration of a big (40 cm × 40 cm) diffuse light source to achieve an extremely high concentration in one lateral direction at the expense of that in the other direction, to preserve the total (two-dimensional) optical brightness. Such anamorphic concentration is achieved by a combination of two conventional two-dimensional concentrators and a properly designed retroreflector array. Our experiments in search of a diffuse white-light source with properties comparable with those of solar radiation have yielded 28-fold improvement of the one-dimensional concentration ratio compared with those of conventional concentrators and 14-fold improvement compared with the one-dimensional thermodynamic limit.

© 2000 Optical Society of America

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(220.1770) Optical design and fabrication : Concentrators
(230.6080) Optical devices : Sources
(350.6050) Other areas of optics : Solar energy

History
Original Manuscript: January 3, 2000
Revised Manuscript: March 20, 2000
Published: August 1, 2000

Citation
Nir Davidson, Lev Khaykovich, and Erez Hasman, "Anamorphic concentration of solar radiation beyond the one-dimensional thermodynamic limit," Appl. Opt. 39, 3963-3967 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-22-3963


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References

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  12. To simplify the notation, we discuss the special case when DX1 = DY1 and αX1 = αY1. The procedure is applicable also to the general case DX1 ≠ DY1 or αX1 ≠ αY1.
  13. Our procedure can be readily extended for broader optimization criteria when the flux concentration can be increased in exchange for a small sacrifice in collection efficiency. This would lead to higher optimal values for the numerical aperture of the PM, depending on the exact trade-off between concentration and efficiency.
  14. Because the actual X width of the beam at the RR plane was measured to be 8.4 mm (FWHM), slightly larger than the theoretical value, we used a 10-mm size for each RR to reduce clipping losses to <2%. This yielded an increase in the beam X size to 10 mm on retroreflection.
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