The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1989
Filed:
Mar. 16, 1987
Pertti Puumalainen, Kuopio, FI;
Reijo Kuusela, Kuopio, FI;
Roibox OY, Kuopio, FI;
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.