| 摘要 |
1,274,297. Detecting defects in glass. PPC INDUSTRIES Inc. Nov.28, 1969 [Nov.29, 1968], No.58193/69. Heading G1A. In an apparatus for detecting defects in a moving sheet of glass G a source of highly collimated light 10 is directed on to a rotating prismatic mirror which reflects the light beam on to a concave mirror 14 thereby causing the light beam to scan the surface 15 of the glass sheet G. The variations in light intensity of the light passing through are sensed by a detector 11. An embodiment is described giving details of the rotating prism 12, and using a laser. |
