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| Design and Calibration of the Wireless NC Turntable in 3D Point Clouds Measurement |
| WANG Hong-tao,WANG Xing,WANG Shi-zhou,ZHANG Li-yan,FENG Hang |
| College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 210016,China |
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Abstract The complete 3D point cloud of an object can be obtained by the NC turntable and the measuring equipment based on binocular stereo vision principle.A four-axis NC turntable which can implement two-dimensional linear and rotational movement through any wire-connected or wireless control ways was designed.A novel method for accurate calibrating the two rotation axes of the NC turntable was presented.Firstly,more than three circular markers were pasted on the turntable board and the turntable was drove by the AC servo motors to rotate around the axis to be calibrated.Secondly,the position of the axis to be calibrated was calculated from the three-dimension coordinates of the center of the markers which are captured by a optical coordinate measuring system from the any different rotation angle position of the turntable.Finally,the optimization of the multiple positions was conducted to further improve the calibration accuracy and the final position of the axis in the CCD coordinate system was calibrated consequently.The result of the experiment shows that NC turntable has a flexible and convenient control way,the designed calibration approach has the features of briefness,low cost,high stability and reliability.
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2012, Vol. 33 
