With the help of the edge effect of I-groove, the sensor can convert the continuous photosignal into digit signal and get the deviation of welding torch quantitatively.

• 该传感器利用坡口棱边效应,将间隙中光源发出的连续光信号离散成数字形式的光信号,从而能定量给出偏移量的大小,具有跟踪精度高、占用焊缝周围空间小、电路简单、抗干扰能力强等特点。