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Related Experiment Video

Updated: Jul 1, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Optical efficiency of solar concentrators by a reverse optical path method.

A Parretta1, A Antonini, E Milan

  • 1ENEA C.R. E. Clementel, Via Martiri di Monte Sole 4, Bologna, Italy. parretta@fe.infn.it

Optics Letters
|September 17, 2008
PubMed
Summary

A new method uses reverse illumination to characterize solar concentrators. This technique simplifies measuring angle-resolved efficiency, offering an alternative to direct illumination methods.

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Area of Science:

  • Optics and Photonics
  • Renewable Energy Technologies

Background:

  • Accurate optical characterization is crucial for optimizing solar concentrator performance.
  • Conventional methods for measuring angle-resolved efficiency can be complex and time-consuming.

Purpose of the Study:

  • To develop a simplified and effective method for the optical characterization of solar concentrators.
  • To establish a correlation between projected light intensity and angle-resolved efficiency.

Main Methods:

  • Developed a novel method employing reverse illumination with a Lambertian light source.
  • Measured the intensity of light projected onto a far screen.
  • Applied the method to simulate reflective nonimaging and Fresnel lens concentrators.

Main Results:

  • Demonstrated a simple correlation between projected light intensity and angle-resolved efficiency.
  • Validated the method's applicability to different types of solar concentrators.
  • Showcased the method as a viable alternative to direct illumination procedures.

Conclusions:

  • The developed reverse illumination method provides a straightforward approach for solar concentrator optical characterization.
  • This technique simplifies the measurement of angle-resolved efficiency, enhancing characterization processes.
  • The method is applicable to various solar concentrator designs, including nonimaging and Fresnel types.