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Proceedings Paper

Characterization of CPC solar concentrators by a laser method
Author(s): A. Parretta; A. Antonini; M. Stefancich; V. Franceschini; G. Martinelli; M. Armani
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Paper Abstract

In this paper we present a method of optical characterization of solar concentrators based on the use of a laser beam. The method, even though constrained by lengthy measurements, gives nevertheless interesting information on local mirror surface defects or manufacturing defects, like internal wall shape inaccuracies. It was applied to 3D-CPC-like concentrators and the measurements were supported by optical simulations with commercial codes. The method, simple to apply, requires just a laser to scan the CPC input aperture following a matrix-like path, at a controlled orientation of the beam. Maps of optical efficiency as function of the laser beam incidence angle are obtained by matching the CPC exit aperture with a photodetector with an efficient light trapping. The integration of each map gives the CPC efficiency resolved in angle of incidence, so curves of optical transmission (efficiency) as function of incidence angle can be drawn and the acceptance angle measured. The analysis of the single maps allows to obtain interesting information on light collection by the different regions of CPC input area. It reveals, moreover, how the efficiency of light collection depends on several factors like surface reflectivity, number of reflections of the single beam, local angle of incidence, local surface defects, and so on. By comparing the theoretical analysis with the experimental results, it is possible to emphasize the effects directly related to manufacturing defects.

Paper Details

Date Published: 28 September 2007
PDF: 12 pages
Proc. SPIE 6652, Optical Modeling and Measurements for Solar Energy Systems, 665207 (28 September 2007); doi: 10.1117/12.733925
Show Author Affiliations
A. Parretta, ENEA Ctr. Ricerche, E. Clementel (Italy)
Univ. of Ferrara (Italy)
A. Antonini, Univ. of Ferrara (Italy)
CPower SRL (Italy)
M. Stefancich, Univ. of Ferrara, CNR, (Italy)
CPower SRL (Italy)
V. Franceschini, Univ. of Ferrara (Italy)
G. Martinelli, Univ. of Ferrara (Italy)
M. Armani, EURAC research (Italy)

Published in SPIE Proceedings Vol. 6652:
Optical Modeling and Measurements for Solar Energy Systems
Daryl R. Myers, Editor(s)

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