Safety light curtains and safety light grids are commonly used safety protection devices in the robotics field. They create an invisible light curtain or grid around the robot, detecting any broken light beam and immediately stopping the robot's movement. This protective device safeguards workers from injuries by robots and quickly halts the robot's motion during emergencies, thereby reducing losses of personnel and equipment. Safety light curtains and safety light grids have been widely applied in modern manufacturing, becoming an essential means of ensuring worker safety.