Vision Based Two-Dimensional Measurement of Machine Tool Motion Trajectory

抄録

The final goal of this study is to develop a vision-based method for measuring machine 3D-dynamic motion errors. In this report, a measurement method is proposed, and its resolution and measurement error in plane motion measurement are discussed. The influence of the defocus condition on the detection resolution is analyzed. The displacement of the marker installed on the spindle of the machine tool is obtained through the video captured by the high-speed camera. In order to obtain the displacement of the marker, the center position of the marker is identified by fitting a mathematical function to obtain the position of the intensity peak of the marker. The measurement resolution and accuracy of the proposed method are investigated by experiments. In addition to the model fitting method, edge detection method and threshold detection method are also used for marker position detection for comparison. The model fitting method reach the accuracy of 40 μm and resolution of 7 μm compared with the grid encoder as the reference. The standard deviation of the detected static position is less than 7 μm when the defocus length is less than 190 mm.