Functions: Specifically designed for plate production lines in the metallurgical industry, it identifies welds by detecting small holes near plate welds. It adopts infrared LED to emit high-frequency pulsed light, accurately captures weld signals through synchronous detection and time-sharing scanning technology. Equipped with transmitter self-inspection and abnormal alarm functions, it can output relay contact signals and level signals, support adjustment of output hold time, has strong resistance to ambient light interference, and can adapt to high-speed moving plate detection, providing reliable control signals for automatic control systems.