The beam cross-section measurement system uses YAG or OTR to convert the invisible light beam or electron beam into a visible light spot, and observes the position and size of the spot through the optical imaging system to infer the position and size of the light beam or electron beam. The position of the target or other components of the system can be quickly and accurately switched, and a real-time video monitoring module is configured to provide online viewing capabilities. According to the radiation requirements, you can choose the straight-through video surveillance module and the corner video surveillance module.