G - Physics – 01 – N
Patent
G - Physics
01
N
340/124, 73/57
G01N 21/17 (2006.01) G01M 11/00 (2006.01) G01N 21/47 (2006.01) G01N 21/59 (2006.01) G01N 21/84 (2006.01) G03C 1/74 (2006.01)
Patent
CA 1217650
ABSTRACT OF THE DISCLOSURE A primary beam of light is directed against the surface of a piece of material under conditions predetermined to gener- ate a secondary beam by either transmission through the piece or reflection from the surface thereof. The secondary beam is directed against means for measuring the intensity of the transmitted or reflected light and the light intensity measured. The procedure is repeated on a different surface of the piece and the results compared. This gives an evaluation of the surface and a determination of the presence, absence, or con- dition of any coating which may be present on the surface The apparatus of the invention comprises means for achieving the foregoing functions. The method and apparatus are of particular application in the determination of which is the coated side of an object, such as a photographic film, or a coated lens.
448908
Byers Donald W.
Gowling Lafleur Henderson Llp
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