Measuring the surface roughness of a moving sheet material

Details Measuring the surface roughness of a moving sheet material Measuring the surface roughness of a moving sheet material

1975-03-25

1977-04-19

Church, Craig E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356120, 356199, 356209, G01N 2132, G01B 1130, G01N 2148

Patent

active

040190668

ABSTRACT:
The invention is concerned with measuring "on-line" the surface roughness of a moving sheet material, e.g. a paper web. The method comprises illuminating the moving web, preferably at a low angle, suitably collecting the light reflected from the moving web and processing the light by means of a sensitive photo-electrical system. The electrical signals thus obtained are divided into an AC and a DC component, the components are separately measured and their ratio used as an index of roughness. An apparatus for carrying out roughness measurements on a moving paper web, e.g. on a paper machine, is described.

REFERENCES:
patent: 2947212 (1960-08-01), Woods
patent: 3176306 (1965-03-01), Burns
patent: 3436556 (1969-04-01), McCartney
patent: 3469104 (1969-09-01), Hector
patent: 3496365 (1970-02-01), Mounce
patent: 3591291 (1971-07-01), Greer et al.

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