Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1977-12-22
1980-08-05
McGraw, Vincent P.
Optics: measuring and testing
By polarized light examination
With light attenuation
356445, 356430, 250572, 356237, G01B 1130, G01N 2148, G01N 2132
Patent
active
042159393
ABSTRACT:
This invention relates to a method and apparatus for determining whether a glue drop is present on the reflective inner surface of a closure. Collimated light is projected onto the reflective inner surface of the closure, and a measurement is taken of the amount of light which remains collimated after reflection from the closure. The measurement of the amount of light reflected in this way is used to determine whether a glue drop is present.
REFERENCES:
patent: 3245306 (1966-04-01), Potter et al.
patent: 3484150 (1969-12-01), Tadka et al.
patent: 3767306 (1973-10-01), Mast et al.
Dalton, Bright Field Reflective Schlieren System, IBM Technical Disclosure Bulletin, Jun. 1971.
Miller John W. V.
Ringlien James A.
Bovernick Rodney B.
Click Myron E.
McGraw Vincent P.
Nelson John R.
Owens--Illinois, Inc.
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