Mr. Norbert Hahn Profile

Norbert Hahn

at Univ Karlsruhe

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Proceedings Article | 26 April 2008 Paper

The phantom light effects in modern car taillight combinations

Norbert Hahn, Karsten Klinger, Karl Manz, Uli Lemmer

Proceedings Volume 7003, 700328 (2008) https://doi.org/10.1117/12.780010

KEYWORDS: Taillights, Lamps, Signal detection, Sun, Cameras, Electrochemical etching, Light sources, Reflection, Safety, Cognition

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There are some interfering elements, which are able to influence the signal functions of a car's rear light. One of these elements is the sensitivity to external light sources, which is able to affect the intensity of the rear lamps by the impact of direct sunrays in a flat angle. Recognition of the signals could be made more difficult or impossible. This effect is called phantom light effect. Today the regulations of the ECE do not contain these influences. To investigate the meaning of the effects to the traffic safety, there has been a test with a sun simulator. The task of this test is to measure the luminance of signals from different actual taillights with and without sunlight. Another part of the investigations are some psychophysical tests involving about 20 persons. The dimension of phantom light effects at taillights will be quantified by the analysis of the luminance pictures. With these cognitions some possibilities to reduce the phantom light effect with little changes in the optical design of taillights will be performed. One example will be shown.

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