为了确保激光切割质量,避免由工件本身起伏不平等误差引起的散焦现象,需要对激光焦距进行自动控制,使激光焦点始终位于工件里面。本文提出一种非接触式单片微机高度自动控制装置,用一体化喷嘴电容传感器检测出工件表面变化,然后用伺服电机驱动透镜,使透镜与工件之间的高度能随着工件表面的不平自动调整,即在切割过程中实现自动对焦。 In order to ensure the laser cutting quality and avoid the defocus caused by the uneven fluctuation of the workpiece itself, the laser focal length needs to be automatically controlled so that the laser focus is always located in the workpiece. This paper presents a non-contact single-chip microprocessor-based high-level automatic control device with integrated nozzle capacitance sensor detects the workpiece surface changes, and then drive the lens with a servo motor so that the height between the lens and the workpiece with the workpiece surface uneven automatic Adjust, that is in the cutting process to achieve autofocus.