Headlamp innovations: Optical concepts for fully adaptive light distributions

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Knöchelmann, M.; Kloppenburg, G.; Lachmayer, R.: Headlamp innovations: Optical concepts for fully adaptive light distributions. In: Proceedings of SPIE - The International Society for Optical Engineering 10546 (2018), 105460K. DOI: https://doi.org/10.1117/12.2290013

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To cite the version in the repository, please use this identifier: https://doi.org/10.15488/3824

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Sum total of downloads: 488




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Abstract: 
Glare avoidance and marking lights are two of the many functionalities offered by advanced automotive headlamps such as Matrix-LED systems. DMD-based headlamps offer resolution enhancements to these two adaptive lighting functionalities. This is achieved via a precise optical system that exhibits high marking and glare avoidance efficiencies. This work evaluates two concepts for an optical system that enables fully adaptive light distributions. Light distributions from automotive headlamps are characterized by a wide aspect ratio and a centrally located hotspot marked by a high luminous intensity. Due to the popular use of DMDs in video projectors, DMD properties counter-productive to automotive applications are regularly encountered. For example, DMDs for projectors require to be illuminated homogeneously in order to obtain a homogeneous projection whereas headlamps require a hotspot centric distribution. It is possible to digitally create a hotspot with conventional projection optics but the results come with a significant loss in optical efficiency. The two concepts for an optical system compared in this paper are: anamorphic optics and optics with pincushion distortion. This comparison is conducted using optical simulations. Photometric measurements are then taken from a vehicle headlamp based DMD and distorting optics and compared with the simulation as a validation step. Due to the strong distortion of the lens system the relation between the DMD image and the final light distribution is highly non-linear. The paper is concluded with key observations with regards to this non-linearity.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Document Type: BookPart
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
total perc.
1 image of flag of Germany Germany 205 42.01%
2 image of flag of United States United States 43 8.81%
3 image of flag of Korea, Republic of Korea, Republic of 28 5.74%
4 image of flag of Czech Republic Czech Republic 24 4.92%
5 image of flag of China China 24 4.92%
6 image of flag of Taiwan Taiwan 22 4.51%
7 image of flag of India India 17 3.48%
8 image of flag of Japan Japan 15 3.07%
9 image of flag of France France 14 2.87%
10 image of flag of Austria Austria 13 2.66%
    other countries 83 17.01%

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