System and method for measurement of traveling webs

Details System and method for measurement of traveling webs System and method for measurement of traveling webs

1986-08-29

1988-08-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250339, 356429, G01N 2185

Patent

active

047679352

ABSTRACT:
A system and method for optically measuring parameters such as dry basis weight of fibrous sheet materials during manufacture without scanning. The system includes mirror sections for reflecting modulated light as parallel rays perpendicularly incident upon one surface of a traveling web, and a plurality of light detection devices to detect light transmitted through the web at two distinct wavelengths. The system further includes ducts to environmentally isolate the mirror sections and the light detection devices.

REFERENCES:
patent: 3655980 (1972-04-01), Bossen
patent: 3806730 (1974-04-01), Tirkkonen et al.
patent: 4006358 (1977-02-01), Howarth
patent: 4124300 (1978-11-01), Mead et al.
patent: 4300049 (1981-10-01), Sturm
patent: 4577104 (1986-03-01), Sturm

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