Related Standard: ISO 3538 Road Vihicles- Safety glazing materials- Test Methods for optical properties

GB/T 5137.2-1996 Road Vihicles- Safety glazing materials- Test Methods for optical properties

Target test, test of the secondary image deflection/deviation

Test purpose: determine the angular separation between the primary and secondary images.

Sample:The products of the front windshield.

Instrument: It is made by a light box of 300mm*300mm*150mm, in its front there is a ring spot target made form the opaque black paper or the glass covered by the matt black print. The light box is illuminated with suitable light source, and the interior surface is coated with matt white paint.

Sample Support Frame: The sample can be placed at the established angle of the actual vehicle and can be rotated and moved horizontally and vertically.

Dark room: To see the presence of the secondary image, set the instrument in dark room or dark area.