Method and apparatus for detection of inclusion in glass

摘要

Inclusions in a transparent panel ( 5 ) are detected by placing a light transmissive interface ( 3 ) in contact with the panel ( 5 ), and transmitting a beam of light (1) through interface ( 3 ) into panel ( 5 ). Within the panel ( 5 ), the light beam ( 7 ) propagates along a path including total internal reflections at surfaces of panel ( 5 ). When the light beam ( 1 ) intercepts inclusions ( 10 ) or other defects at least some of it is scattered, and leaves the panel ( 5 ). This scattered light is then observed. Thus, a large zone of the panel ( 5 ) can be inspected, with light only being detected in the case that it arises from scattering by inclusions or other defects.