MEASUREMENT OF TABLE ACTIVITY ON A FOURDRINIER PAPER-MACHINE - A NEW PHOTOCLINOMETRIC TECHNIQUE

The statistical photoclinometric shadow method is applied to table act ivity measurement on the Fourdrinier wire section of a paper machine. The imaging system consists of a CCD video camera and a stroboscope th at illuminates the wire and freezes its motion. images are grabbed and fed directly to a PC for subsequent processing. In addition to the ph otoclinometric method, the instrumentational and computational methods are also described. Special attention is paid to the computational an d experimental testing. The method is shown to perform well under typi cal operating conditions of a Fourdrinier wire section, and has a grea t potential for use in the paper industry, because it allows measureme nts on a production machine without disturbing production.