Optical shoe assembly for use with a multi-sensor optical head

Details Optical shoe assembly for use with a multi-sensor optical head Optical shoe assembly for use with a multi-sensor optical head

1975-07-07

1977-04-05

McGraw, Vincent P.

Optics: measuring and testing

Standard

356199, 356244, G01J 102

Patent

active

040159043

ABSTRACT:
An optical shoe assembly for use with an optical head in an on-line system for continuously monitoring the color, opacity and brightness of a moving web of paper, or the like, in which the shoe frame supports a length of the web over a housing opening, the edge of which is normally in a sealing relationship with the edge of a first side of a block rotatably supported in the housing.
This first block side is formed with an optically black recess covered by a quartz shoe carrying a transversely extending white background over a portion thereof to provide spaced white and black backgrounds in the normal operating condition of the shoe assembly. Respective second and third sides of the block carry a white standard, such, for example, as a mirror, and a black standard which standards may selectively be positioned in the housing opening by a motor which drives the block mounting shaft. Means is provided for pressurizing the housing as the standards sides are brought into position to prevent foreign matter from entering the housing.

REFERENCES:
patent: 3476482 (1969-11-01), Howard et al.

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