| 摘要 |
A system and method for the evaluation of optical elements in order to grade these according to predetermined criteria of quality, especially suited for optical elements devoid of optical power. The examined optical element (22) is illuminated with a wide-angle beam of white light, which is passed via a diffusing screen (12) having a masked out circular central area (13), and a relay lens (14), and there is also provided on the optical axis an imaging lens (16) which receives only light scattered from defects of the optical element, and there are provided means for evaluating these light signals so as to grade the said optical elements. |
