Nonimaging Fresnel Lenses

Leutz, Ralf; Suzuki, Akio

doi:10.1007/978-3-540-45290-4

Cited by 108 publications

(30 citation statements)

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“…The manufacturability of DFK concentrator depends on a key issue: the POE molding and demolding processes. A dome-shaped Fresnel lens (the case of POE) cannot be designed with positive draft angles for the inactive facets (leading to a simple demolding process) since geometrical losses would increase dramatically [6]. Hence a single movement along z axis will not allow for the extraction of the lens from the molding die.…”

Section: Daido Steel Poe Demolding Techniquementioning

confidence: 98%

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Photovoltaic performance of the dome-shaped Fresnel-Köhler concentrator

Zamora

Benı́tez

et al. 2012

SPIE Proceedings

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In order to have a cost-effective CPV system, two key issues must be ensured: high concentration factor and high tolerance. The novel concentrator we are presenting, the dome-shaped Fresnel-Köhler, can widely fulfill these two and other essential issues in a CPV module. This concentrator is based on two previous successful CPV designs: the FK concentrator with a flat Fresnel lens and the dome-shaped Fresnel lens system developed by Daido Steel, resulting on a superior concentrator. The concentrator has shown outstanding simulation results, achieving an effective concentrationacceptance product (CAP) value of 0.72, and an optical efficiency of 85% on-axis (no anti-reflective coating has been used). Moreover, Köhler integration provides good irradiance uniformity on the cell surface and low spectral aberration of this irradiance. This ensures an optimal performance of the solar cell, maximizing its efficiency. Besides, the domeshaped FK shows optimal results for very compact designs, especially in the f/0.7-1.0 range. The dome-shaped FresnelKöhler concentrator, natural and enhanced evolution of the flat FK concentrator, is a cost-effective CPV optical design, mainly due to its high tolerances. Daido Steel advanced technique for demolding injected plastic pieces will allow for easy manufacture of the dome-shaped POE of DFK concentrator.

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Section: Daido Steel Poe Demolding Techniquementioning

confidence: 98%

“…The POE is a dome-shaped (curved) Fresnel lens [6] [7], while the SOE is a refractive lens, optically coupled to the solar cell. Both optical elements are designed with free-form surfaces.…”

Section: Dfk Concentrator Designmentioning

confidence: 99%

Photovoltaic performance of the dome-shaped Fresnel-Köhler concentrator

Zamora

Benı́tez

et al. 2012

SPIE Proceedings

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“…All of them include a Fresnel lens as primary component [4]. This optical diffractive element was combined to an additional lens, to perform a higher focalisation of the beam.…”

Section: Study Of Optical System Modificationsmentioning

confidence: 99%

New Optical Layouts for a Solar Simulator to Allow Cell Tests

Fontani

Jafrancesco

Sansoni

et al. 2011

JPES

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Possible modifications for a solar simulator Yamashita YSS-200 were studied and experimented with the aim of allowing the test of concentration photovoltaic cells (CPV cells). Three different solutions were simulated and compared, using Zemax and TracePro, finally selecting the most suitable one. The modification consisted in a supplementary optical system that was externally added to the existing layout. The auxiliary system was easily demountable, thus allowing a rapid restoring of the original configuration. The selected optical system was realised and suitable optical tests verified that it satisfied the requirements on irradiance level and irradiance uniformity. Spectral measurements confirmed that the employed materials did not significantly modify the spectral distribution of the light emitted by the solar simulator.

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“…The second drawback has to deal with the manufacturing process itself [1]. If manufacturing a thick lens (over 10mm thick) by the well-known plastic injection process, it is really difficult a proper result, due to the nonuniform shrinkage of Figure 1 Optical efficiency losses due to draft angle.…”

Section: Introductionmentioning

confidence: 99%

Novel freeform optical surface design with spiral symmetry

Zamora¹,

Benı́tez²,

Miñano³

et al. 2011

Novel Optical Systems Design and Optimization XIV

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Keywords: geometric optical design, manufacturing techniques, illumination, CPV Manufacturing technologies as injection molding or embossing specify their production limits for minimum radii of the vertices or draft angle for demolding, for instance. These restrictions may limit the system optical efficiency or affect the generation of undesired artifacts on the illumination pattern when dealing with optical design. A novel manufacturing concept is presented here, in which the optical surfaces are not obtained from the usual revolution symmetry with respect to a central axis (z axis), but they are calculated as free-form surfaces describing a spiral trajectory around z axis. The main advantage of this new concept lies in the manufacturing process: a molded piece can be easily separated from its mold just by applying a combination of rotational movement around axis z and linear movement along axis z, even for negative draft angles. The general designing procedure will be described in detail.

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Nonimaging Fresnel Lenses

Cited by 108 publications

References 0 publications

Photovoltaic performance of the dome-shaped Fresnel-Köhler concentrator

Photovoltaic performance of the dome-shaped Fresnel-Köhler concentrator

New Optical Layouts for a Solar Simulator to Allow Cell Tests

Novel freeform optical surface design with spiral symmetry

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