Visibility sensor for cars has optical target on windscreen viewed by camera on telescopic mount

摘要

A visibility sensor has a Landolt ring, Foucault of Cobb bar optical target on a car windscreen in the field of view (a) of a camera (16) on a telescopic (18) mount (20, 22) on the car with processing of the image to determine the visibility distance using the Koshmeider formula. Includes an Independent claim for mounting the target close to a rain sensor.