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In the process of strip production, taking the photoelectric position detection sensor as the core of edge detection system is designed to meet the requirements of the fast running speed and improve the production efficiency. The detection system can detect the position of the strip edge quickly and accurately. The position of the strip edge is detected by the Two set of position sensor differential circuit,The output voltage value of the two sets is corresponding to the direction and distance of the strip edge, and the two position signal is transmitted to the correction system. Through the detection of position signal, the system can quickly and accurately control to the position of the strip and ensure the safety of production, and it has wide application prospect in other high-speed strip edge detection.