Local heat treatment of workpiece surfaces by laser beam involves locally resolved temperature measurement on the laser spot or its direct vicinity, and control of the laser output power

摘要

The temperature of the laser spot or at least its direct vicinity is measured with local resolution, with the temperature measurement spot (2,2') covered by at least one pyrometer being smaller than the laser spot. The temperature measurement spot synchronously follows the motion of the laser spot over the workpiece surface. Several controllers or control loops are used for sequential control of the laser output power.