Surface finish monitor

Details Surface finish monitor Surface finish monitor

1976-12-22

1978-11-07

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250572, 356369, 356430, 356448, G01N 2148

Patent

active

041248031

ABSTRACT:
The purpose of this invention is to reveal the surface properties, such as smoothness and resulting printability of a rapidly moving strip of material, such as paper. To accomplish this, the production process is continuously monitored, without error due to environmental conditions such as dust and dirt on optical surfaces, temperature affects, lamp degradation, etc. An index of printability relative to smoothness is obtained by integrating the plateau areas in the optical field of view. A unique combination of approach angle, selected wave length of infra red radiation, horizontal polarization of search beam, and use of four optical paths to obtain mathematical model equivalency, is employed.

REFERENCES:
patent: 3636361 (1972-01-01), Bowers
patent: 3734624 (1973-05-01), Cornelius

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