On-line texture sensing

Details On-line texture sensing On-line texture sensing

1989-04-13

1990-06-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

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

250571, 250225, 356369, G01N 2188

Patent

active

049316575

ABSTRACT:
The texture of a travelling web is determined by instantaneously illuminating an area of the web via a strobe light and phtographing the illuminated area by a video camera correlated to operate in conjunction with the strobe. The signal from the camera is digitized, histogrammed and analyzed to determine the characteristics of the web. The strobe light may direct the light through the web or at an angle to the web and the video camera depending on the characteristics to be determined may be positioned to receive specularly reflected light from the web or reflected light or positioned on the opposite side the web to receive light transmitted through the web. In one embodiment the light is polarized and directed at Brewster's angle onto the surface of the web and only similarly polarized specularly reflected light is received by the camera.

REFERENCES:
patent: 4506980 (1985-03-01), Pryor etal.
patent: 4644174 (1987-02-01), Ouellette et al.
patent: 4648712 (1987-03-01), Bernholt
patent: 4760271 (1988-07-01), Bernholt
A Formation Tester which Graphically Records Paper Structure, Burkhard et al., Pulp and Paper Magazine of Canada, 60, No. 6, T319-T334 Jun., 1960).
Development of an On-Line Formation Tester to Determine Optimal Use of Retention Aids, Landmark et al., Paper Trade Journal, Sep. 1984, pp. 80 to 86.
Optical Measurement Throws New Light on Paper Surface, Hansuebasi and Morantz, Paper Technology in Industry, Aug., 1987.
Solid State Surface Inspection Equipment, P. W. Loose, Jun., 1987 TAPPI Journal, pp. 69 to 74.
On-Line Automatic Pulp Dirt Count Measurement, Kemeny et al., Tappi Conference proceedings, 1987, pp. 21-24.

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