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Irradiance tailoring with two-sided, Fresnel-type freeform optics

: Bruneton, A.; Bäuerle, A.; Traub, M.; Wester, R.; Loosen, P.


Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Bellingham, WA: SPIE, 2012 (SPIE Proceedings 8485)
Efficient Design for Illumination and Solar Concentration <9, 2012 , San Diego>
Conference Paper
Fraunhofer ILT ()

Based on the Monge-Kantorovich theory of optimal mass transport, the computation of a ray mapping between source and target irradiances is used to design two-sided freeform lenses fulfilling the constraints of an automotive application: compactness and sharp bright-dark cutoff. A generic segmentation technic resulting in Fresnel-type optics is presented and the whole procedure is illustrated with the design of a fog light lens. Finally Monte Carlo simulation of the virtual model and measurements of a polycarbonate prototype are presented.