Apparatus and process for measuring formation and roughness of a

Details Apparatus and process for measuring formation and roughness of a Apparatus and process for measuring formation and roughness of a

1986-03-25

1988-07-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 250562, 250559, 356430, G01N 2132

Patent

active

047602716

ABSTRACT:
An apparatus and process are disclosed for examining a moving web of paper to determine the optical parameter of "formation" and the physical parameter of "roughness". The apparatus includes an optical system which forms an area of the web, with a first light source directing light through the moving web area from a back surface thereof, and a second light source directing light obliquely to the web area from the front surface thereof. A signal processing device determines the root-mean-square of the quotient resulting from the difference in received radiation from two spatially adjacent areas of the detectors divided by the sum of the received radiation from four spatially adjacent areas of said detectors to provide an output signal corresponding to formation or roughness of the paper web.

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patent: 4644174 (1987-02-01), Ouellette et al.

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