Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1974-03-13
1976-02-03
Webster, Robert J.
Optics: measuring and testing
For optical fiber or waveguide inspection
356199, 356176, 356178, 356244, 356256, 250226, 2091116, G01J 350, G01N 2130
Patent
active
039361896
ABSTRACT:
An on-line system for continuously monitoring the color, opacity and brightness of a moving web of paper or the like in which an optical shoe providing black and white backgrounds spaced in the direction of movement of the web supports a portion of the web below and generally in registry with an optical head made up of a light integrating sphere for directing light from a source onto the web over the shoe and a plurality of elongated sensing units mounted in the upper portion of the sphere and including a centrally located brightness measuring unit oriented generally perpendicularly to the web toward a point over the black background, four circumferentially spaced color tristimulus sensing units, each of which is oriented at an angle to the axis of the central unit so as to be directed at the same point as is that unit and a sixth opacity sensing unit angularly oriented with respect to the axis of the central unit so as to be directed toward a point over the white background spaced downstream of the first point. The optical shoe, in addition to the black and white backgrounds normally positioned below the web, carries respective black and white standards adapted selectively to be moved into cooperative relationship with the head when the system is off web to permit the detectors to be standardized without removing the sensing head from the installation.
REFERENCES:
patent: 1950975 (1934-03-01), Davis
patent: 2882785 (1959-04-01), Biesele, Jr.
patent: 3455637 (1969-07-01), Howard
patent: 3476482 (1969-11-01), Howard et al.
Van Brimer et al., Tappi, Vol. 50, No. 2, pp. 65A-70A, Feb., 1967.
Wickstrom, Tappi, Vol. 55, No. 11, Nov. 1972, pp. 1588-1591.
Sentrol Systems Ltd.
Webster Robert J.
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