| 摘要 |
<p>The invention relates to a method in the process of manufacturing and/or finishing a fibre web (11), in which method said continuous and moving web (11), and/or a moving means (16, 17) related to the processing of the web (11), is monitored by at least one optical spectrum separating measurement device (10) to determine at least one quality variable of said object (11, 16, 17) for the purpose of controlling the quality or condition. According to the invention, spectral data is collected in synchronization with the movement from the object (11, 16, 17) which is being examined and is in a progressive and/or rotating movement, by measuring electromagnetic radiation, which has been transmitted, reflected, or otherwise emitted by the object, in a temporally and spatially resolved manner. On the basis of this spectral data, a two-dimensional quality variable chart (40) is formed, which is substantially continuous in the direction of movement of the object (11, 16, 17) and presents at least one quality variable of the object, and in order to determine the characteristics of the object (11, 16, 17) and/or to detect defects in the object from said continuous quality variable chart (40), local deviations and/or discontinuities (41, 42) are detected in said continuous quality variable chart (40), especially in the direction of movement. The cause of these deviations and/or discontinuities (41, 42) is identified on the basis of the periodicity (45, 56) of said phenomena in the direction of movement.</p> |
