Safety considerations have always driven the way for improving exterior automotive lighting legal requirements. With
the recent adoption of day-time running lamps for passenger cars, the steadily increasing need for reduction of vehicle
power consumption has led to the introduction of LED-based day-time running lamps.
Solutions with incandescent bulbs have also been implemented, as they present price advantages while offering limited
design perspectives. In the meantime, technology developments has turned LED sources into ideal candidates for daytime
running lamps by increasing their lumen per watt efficiency ratio towards values around 100 lm/W or higher.
In this work, taking as an example the new Mercedes-Benz roadster SLK (R172), we present the first single LED daytime-
running lamp, with a total power consumption below 5W per vehicle. After reviewing legal requirements, the
optical and electronic concepts are discussed.
Details on the tail lamp LED functions are also discussed, and particularly the advantages from the realization of fog
lamp with LEDs.
A shape-from-shading algorithm is applied to topography images of silica waveguide sidewalls coming from a Scanning Electron Microscope. The approach is found appropriate to restitute the sidewall profile. The reconstructed relief obtained is then height calibrated via Line Edge Roughness measurement. The technique enables thereafter roughness measurement at arbitrary positions on the sidewall, with the advantage of providing non-destructive testing on full wafer.
Conference Committee Involvement (1)
SPIE Eco-Photonics 2011: Sustainable Design, Manufacturing, and Engineering Workforce Education for a Green Future