TY - CONF AB - Today's automotive headlights are built with transparent cover lenses. Therefore condensation of water leads to a visible optical defect. This paper presents a new approach for determination of the droplet size using colour phenomena in totally reflected light. It is based on a model of the generation of colour patterns by interference of several rays of light each multiple totally reflected inside condensed droplets. The droplet size may be determined by the colour if the contact angle is known. Measurement of both droplet size and colour all AU - Wetzlar, Dietmar AU - Henning, Bernd AU - Nolte, Sascha AU - Klahold, Jens ID - 15351 SN - 978-3-9810993-0-0 TI - Investigation of colour phenomena in condensed water droplets ER -