An Instrument to Measure Scattered Light Due to Windshield Wear 856042
An instrument is described that permits the measurement of
scattered light on windshields in cars in full daylight. It
presents the intensities of the scattered light in the form of a
diagram and calculates two indices, which can be associated with
the most prominent types of wear, i.e., impact of small stones and
The instrument is easy to operate and permits inspection of a
large number of windshields in a short time. Measurements on 300
vehicles indicate a linear increase in wear due to impact of small
stones with mileage and a more-than-linear increase of wiper
damage. Vehicles of identical mileage can have very different
values depending on the type of use.
It is also examined how the different amounts of wear as
characterized by the measured indices affect the ability of test
persons to see and recognize objects on the road.