| 摘要 |
A scanning system and method for optically measuring parameters such as dry basis weight, basis weight and moisture content of fibrous sheets during manufacture. The system includes a first track that extends generally parallel to one face of a traveling web in the cross direction; a stationary light source arranged to direct collimated light generally parallel to the first track; a first reflector that travels along the first track and focuses the collimated light against the adjacent face of the web; a second track that extends parallel to the first track adjacent the opposite face of the web; a second reflector that travels along the second track and collects and collimates rays that are transmitted through the web; and stationary light detectors that detect the intensity of the collected rays at least at two selected ranges of wavelengths to measure the absorption properties of the traveling web at selected locations. |
