Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-11-05
1989-04-18
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 2503591, G01N 2135
Patent
active
048230081
ABSTRACT:
Apparatus and methods for use in measuring the moisture content of heavy-grade sheets of paper during their continuous manufacture. In one aspect, means employing infrared absorption techniques for determining the fiber weight per unit area of a sheet having a fiber weight of up to 1100 grams per square meter are provided. In another aspect, means employing infrared absorption techniques including the use of two moisture absorption bands and associated moisture reference bands for calculating the average temperature of the sheet are provided. The latter aspect may be used to produce an indication of moisture weight per unit area, wherein the indication is substantially independent on changes in the average temperature, and enables accurate measurement of the moisture weight per unit area of heavy grades of paper having moisture weights of up to 450 grams per square meter. The former aspect may be employed in measuring the moisture content of heavy grade of paper having moisture weights of up to 90 grams per square meter.
REFERENCES:
patent: 3405268 (1968-10-01), Brunton
patent: 3551678 (1970-12-01), Mitchell
patent: 3661462 (1972-05-01), Natens
patent: 3793524 (1974-02-01), Howarth
patent: 3851175 (1974-11-01), Dahlin et al.
patent: 4027161 (1977-05-01), Williams et al.
patent: 4052615 (1977-10-01), Cho
patent: 4097743 (1978-06-01), Carlson
patent: 4171918 (1979-10-01), Mactaggart
patent: 4300049 (1981-11-01), Sturm
patent: 4306151 (1981-12-01), Chase
patent: 4345150 (1982-08-01), Tamura et al.
patent: 4577104 (1986-03-01), Sturm
Ya. A. Vakulyuk and I. T. Prilipko, "Infrared Water-Content Meter for Paper", Measurement Techniques, vol. 19, No. 7 (Jul. 1976), pp. 1065-1066. Translation of Izmeritel'naya Teknika published by Plenum Publishing Corporation, New York, Dec. 1976.
R. Goldstein, "The Near Infrared Absorption of Liquid Water at Temperatures Between 27.degree. and 209.degree. C.", in Quantitative Spectroscopic Studies on Water Vapor and Liquid Water, Technical Report No. 43 of the California Institute of Technology (Oct. 1963), pp. 24-37.
R. Goldstein, L. D. Gray, "Approximate Spectral Emissivity Calculations for Water Vapor at Elevated Temperatures", in Quantitative Spectroscopic Studies on Water Vapor and Liquid Water, Technical Report, No. 43 of the California Institute of Technology (Oct. 1963), pp. 38-42.
Berneike Richard H.
Hannaher Constantine
Howell Janice A.
Process Automation Business Inc.
LandOfFree
Apparatus and methods employing infrared absorption means to mea does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and methods employing infrared absorption means to mea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and methods employing infrared absorption means to mea will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2398319