| 摘要 |
<p>A method and equipment, with the help of which the gloss can be measured from different kinds of surfaces as well in laboratory conditions as on-line. The present methods and equipments are inaccurate and undependable in particular in factory conditions. According to the invention the with a light partitioning device (5) cut-off visible light is directed from one or several incoming angles radially in the same point on a plane, which is perpendicular to the surface to be measured. In order to determine the gloss out of the surface to be examined (1) the total amount of the specular reflection component and the diffused light component is measured with a light detection apparatus system (9), which is on the same plane with the incoming rays of light. The diffused light component is measured with a light detection apparatus system (13), which is mounted in such a manner, that it sees the lighted part of the surface to be examined from such an angle, that the seeing of the specular reflection is geometrically impossible. The gloss is obtained by calculation from the measuring reception range of the gloss measuring apparatus system the percentile proportion of the specular reflection component by taking advantage of the value of the measured diffused light component. To the equipment in accordance with the invention belong the light source (2, 3, 4), the partitioning device of light (5), the devices (7, 8) for leading of the light to the material web and at least one in the gloss angle positioned light detector (12) and at least one in such an angle positioned light detector, from which the seeing of the specular reflection is impossible.</p> |
