Figure 2
From: Hybrid high-concentration photovoltaic system designed for different weather conditions
Light leakage measurements of the Fresnel lenses in the lab. (a) The thinner Fresnel lens (Fresnel lens #1): 60 main segments with a thickness of 0.56 mm. (b) The thicker Fresnel lens (Fresnel lens #2): 9 main segments with a thickness of 1.81 mm. Both two Fresnel lenses have the same radius. (c) The wavelength of light irradiation is 532 nm, and the power is around 100 mW. With the collimation lens, the light beam fully covers the Fresnel lenses.
