Lasers in Manufacturing (LiM)
Laser beam scanners are often combined with a mechanical axis stage in order to take advantage of both the high dynamics of the scanner device as well as the motion flexibility of the stage system. However, synchronization is yet a challenging control task because of diverging operation principles and incompatible operation frequencies. In this study we investigate a laser process control strategy for laser surface machining which is implemented on a field-programmable gate array (FPGA) data processor. The control system reads geometrical data from memory, performs real-time coordinate transformations based on current stage position sensor signals and generates control signals for the laser scanner and beam modulator. The system is able to solve all computation tasks with an update rate well beyond 100kHz and thus allows for processing strategies which involve continuous motion of scanner and rotation axis for seamless circumferential laser processing on cylindrical surfaces.