Procedure for measuring unit area weights

Details Procedure for measuring unit area weights Procedure for measuring unit area weights

1977-10-27

1979-04-03

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

G01N 2320

Patent

active

041479319

ABSTRACT:
A procedure for measuring unit area weights (base weights) in materials combinations comprising a base material, thereupon a precoating, and upon which latter there is a surface coating or coatings. The materials combination is irradiated with x-rays which excite the characteristic x-ray radiation of a substance in the precoat, the intensity of which is measured above and below the coated base material, in addition to which the absorption in the materials combination of the primary radiation from the radiation source is measured, whereby from the mutually independent results of measurement obtained the unit area weights of the different courses are calculated.

REFERENCES:
patent: 2977478 (1961-03-01), Wuppermann

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