Research on the motion error compensation method of vacuum arc cathode speckle trajectory tracking under direct current disconnection

The cathode spot motion characteristics of vacuum arc are closely related to the evolution law of the arc, and there are the errors of institutional motion and overhead viewpoint leading to distortion of the cathode spot trajectory through the high-speed camera in the process of cathode spot motion information acquisition. Experimentally, it is found that before the error compensation, the circular morphological features of the contact surface present ellipse in the captured image, which indicates that the acquired trajectory contains perspective error; the trajectory presents the pixel vertical drop distribution, which indicates that the acquired trajectory contains the error of institutional motion. Based on this, this paper proposes a correction algorithm for cathode speckle trajectory tracking and motion visual error compensation to restore the real motion trajectory of the cathode speckle, and conducts experimental verification. It is shown that the error of the motion offset in the axial direction of the speckle by the motion of the mechanism can be effectively eliminated, which is less than 4.1%, and the error of the method of correcting the tilt angle is less than 1%.