G - Physics – 01 – N
Patent
G - Physics
01
N
358/7
G01N 23/223 (2006.01) G01N 23/16 (2006.01) G01N 33/34 (2006.01)
Patent
CA 1223677
ABSTRACT OF THE DISCLOSURE A process and apparatus for measuring, without destroying the specimen, the distribution in the thickness direction of the filler and/or coating materials of paper or cardboard. by radiation (Ie) emitted by an X-ray tube is excited in the material component of the object of measure- ment to be examined, its characteristic X-ray radiation, the intensity of this radiation being observed. Measurements are made on both sides of the specimen under examination and the contents of other filler components are determined by X-ray absorption measurements. The base weight of the paper under measurement is determined for instance by beta radia- tion absorption measurements. The distribution measurements of fillers are carried out both by measurements of the char- acteristic radiation of the material components excited in the specimen by constant energy X-ray radiation obtained from an X-ray tube and with the aid of absorption measure- ments of radiation obtained directly from the X-ray tube and of radiation produced with its aid in appropriate transfor- mation targets, for eliminating by calculation the disturb- ing effects exerted by the variation in relation to each other of the contents of the filler components. Alterna- tively, the distribution measurements are carried out both with measurements of the characteristic radiation of the material component excited in the specimen with radiation, obtained from the X-ray tube, varying as to its energy during the measuring cycle and with absorption measurement of the same radiation, to be used in elimination by calcula- tion of the disturbing effect from the variations in rela- tion to each other of the filler components' contents.
442286
Marks & Clerk
Robotest Oy
LandOfFree
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