title: Evolutionary algorithm for optimization of nonimaging Fresnel lens geometry.
abstract: In this study, an evolutionary algorithm (EA), which consists of genetic and immune algorithms, is introduced to design the optical geometry of a nonimaging Fresnel lens; this lens generates the uniform flux concentration required for a photovoltaic cell. Herein, a design procedure that incorporates a ray-tracing technique in the EA is described, and the validity of the design is demonstrated. The results show that the EA automatically generated a unique geometry of the Fresnel lens; the use of this geometry resulted in better uniform flux concentration with high optical efficiency.
authors.affiliation: Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan. noboru@nagaokaut.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Nishikawa