Optics: measuring and testing – For light transmission or absorption
Patent
1983-03-21
1986-05-27
Rosenberger, R. A.
Optics: measuring and testing
For light transmission or absorption
356443, 356445, G01N 2100
Patent
active
045912718
ABSTRACT:
A primary beam of light is directed against the surface of a piece of material under conditions predetermined to generate 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 condition 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.
REFERENCES:
patent: 2359873 (1944-10-01), Poindexter
patent: 2547545 (1951-04-01), Strong
patent: 3353025 (1967-11-01), Sturn
patent: 3559555 (1971-02-01), Street
patent: 3577885 (1971-05-01), Wells
patent: 4281932 (1981-08-01), Young
patent: 4284356 (1981-08-01), Heilman
Cooper Crystal
Farley Eugene D.
Rosenberger R. A.
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