Extremely effective flatness and planarity wave detection on cold flat products, on non reflective metals and other materials.

Laser systems are engineered to evaluate flatness defects on a metal and non metal strip, plate or flat product. Sensors can be moved on a surface about 2000x 2000mm. Inside the control cabinet is installed the controller for data acquisition and management and the display to provide the defects values as output. As defect is considered a variation of the strip flatness or a variation of the distance between the strip and the reference surface. Variation can be positive or negative. The variation in commonly called “wave”. The determination of the wave's shape is made considering both distance and position evaluated respectively using lasers and the encoders. When the wave shape is defined, the system provides the entity and the classification of the planarity defect using known mathematical formulas.