Method and apparatus for measuring of humidity

Details Method and apparatus for measuring of humidity Method and apparatus for measuring of humidity

1987-03-16

1989-03-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2503381, 250341, G01J 350, G01N 2127

Patent

active

048126659

ABSTRACT:
The object of the invention is a method for measuring humidity in material to be produced in the form of a web, particularly paper and carton material. According to the method, a chopper in part cuts infrared light brought on the other side of the web through an opal glass window from an infrared source. The radiation is measured in an analysis part placed adjacent a second opal glass window. Humidity in the web is measured by measurement of the measuring and reference wavelengths; intensities with a measuring analyzer and a reference analyzer and simultaneously adjusting the viewing angles of the analyzers in such a manner, that when the position of the material web between the opal windows is changed, the same value for the humidity is obtained. The wavelengths between the measuring and reference channels have been chosen so that they are as near as possible to each other.

REFERENCES:
patent: 3641349 (1972-02-01), Dahlin
patent: 3675019 (1972-07-01), Hill et al.
patent: 3965356 (1976-06-01), Howarth
patent: 4006358 (1977-02-01), Howarth
patent: 4052615 (1977-10-01), Cho
patent: 4171918 (1979-10-01), Mactaggart

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