Article
Elliptical concentrators
Complutense University of Madrid, Madrid, Madrid, Spain
Applied Optics (Impact Factor: 1.78). 11/2006; 45(29):76227. DOI: 10.1364/AO.45.007622 Source: PubMed
ABSTRACT
Nonimaging optics is a field devoted to the design of optical components for applications such as solar concentration or illumination. In this field, many different techniques have been used to produce optical devices, including the use of reflective and refractive components or inverse engineering techniques. However, many of these optical components are based on translational symmetries, rotational symmetries, or freeform surfaces. We study a new family of nonimaging concentrators called elliptical concentrators. This new family of concentrators provides new capabilities and can have different configurations, either homofocal or nonhomofocal. Translational and rotational concentrators can be considered as particular cases of elliptical concentrators.

 "The concept of hyperparabolic concentrators originated within the fields of geometric optics and solar thermal energy. Within a problem area of nonimaging optics understood as a field devoted to the design of such components, where light collecting systems are used instead of the usual image formation systems [4]. The socalled flowline method have become one of the most productive design techniques once [6] introduced the concept of the geometric vector flux J (where flow line is the direction of J) and showed that ideal flux concentrators have shapes that do not disturb the geometric vector flux field. "
Conference Paper: Optical performance evaluation of a 2D and 3D novel hyperboloid solar concentrator
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ABSTRACT: Ray tracing is an important tool for the design of elliptical–hyperboloid concentrators (EHC). Optical efficiency for a range of parameters such as of incidence angle, concentrator height and different diameters of the receiver can be investigated through ray trace analysis. An extensive theoretical prediction of 2D and 3D ray tracing techniques has been adopted in the current investigation to calculate the optical efficiency of the novel EHC. An optical efficiency of 63% was found for a 2D model of the EHC with the following dimensions: height 0.85 m, aperture length 1m, receiver diameter 0.182 m and concentration ratio of 8X. The reflectivity of the EHC is considered to be 0.94. Due to the threedimensional nature of the EHC, the optical efficiency was improved to 78% based on 3D ray trace geometry. Keywords: Elliptical–hyperboloid concentrator, 3D ray traces geometry, optical efficiency. 
 "The concept of hyperparabolic concentrators originated within the fields of geometric optics and solar thermal energy. Within a problem area of nonimaging optics understood as a field devoted to the design of such components, where light collecting systems are used instead of the usual image formation systems [4]. The socalled flowline method have become one of the most productive design techniques once [6] introduced the concept of the geometric vector flux J (where flow line is the direction of J) and showed that ideal flux concentrators have shapes that do not disturb the geometric vector flux field. "
[Show abstract] [Hide abstract]
ABSTRACT: Ray tracing is an important tool for the design of elliptical–hyperboloid concentrators (EHC). Optical efficiency for a range of parameters such as of incidence angle, concentrator height and different diameters of the receiver can be investigated through ray trace analysis. An extensive theoretical prediction of 2D and 3D ray tracing techniques has been adopted in the current investigation to calculate the optical efficiency of the novel EHC. An optical efficiency of 63% was found for a 2D model of the EHC with the following dimensions: height 0.85 m, aperture length 1m, receiver diameter 0.182 m and concentration ratio of 8X. The reflectivity of the EHC is considered to be 0.94. Due to the threedimensional nature of the EHC, the optical efficiency was improved to 78% based on 3D ray trace geometry. 
Article: Ideal 3D asymmetric concentrator
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ABSTRACT: Nonimaging optics is a field devoted to the design of optical components for applications such as solar concentration or illumination. In this field, many different techniques have been used for producing reflective and refractive optical devices, including reverse engineering techniques. In this paper we apply photometric field theory and elliptic ray bundles method to study 3D asymmetric – without rotational or translational symmetry – concentrators, which can be useful components for nontracking solar applications. We study the onesheet hyperbolic concentrator and we demonstrate its behaviour as ideal 3D asymmetric concentrator.
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