专利名称：Procedure for measuring unit area weights发明人：Pertti Puumalainen申请号：US05/845969申请日：19771027公开号：US04147931A公开日：19790403
摘要：A procedure for measuring unit area weights (base weights) in materialscombinations comprising a base material, thereupon a precoating, and upon which latterthere is a surface coating or coatings. The materials combination is irradiated with x-rayswhich excite the characteristic x-ray radiation of a substance in the precoat, the intensityof which is measured above and below the coated base material, in addition to which theabsorption in the materials combination of the primary radiation from the radiationsource is measured, whereby from the mutually independent results of measurementobtained the unit area weights of the different courses are calculated.
申请人：PUUMALAINEN; PERTTI
代理机构：Toren, McGeady and Stanger
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