Method for the on-line nondestructive measurement of a characteristic of a continuously produced product, and associated device

摘要

The process measures a characteristic (X) which is difficult to measure of a continuously produced product and comprises: choosing at least one easily measurable second characteristic (Y) whose variations are correlated to the variations of the first characteristic; modifying, by means acting on the product in a given zone of the production line, the first characteristic so as to put it into a known predetermined reference state (Xo); taking at least in said zone a measurement of the second characteristic, and; processing said measurement for determining a variation in the first characteristic relative to the reference state (X). Application in the measurement of the flatness of a strip continuously travelling through a levelling machine. FIG. 2.