自由曲面形状の3次元エッジプロファイル計測に関する研究(第1報) : 光リング画像によるエッジ自動検出

概要

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This paper describes development of an efficient measuring method of 3-dimensional edge profile with high accuracy for free form surface. A new method is proposed for measurement of 3-D edge profile by means of optical ring images. 3-D profile sensor based on optical ring images has more advantage than the others because it detects as not a light spot but a ring image of the reflected light from a target point. The changes of optical ring image intensity occur in the edge. The differences between the intensities of ring images in the ordinary plane and the edge are represented by cross correlation coefficient, which is used as measuring parameter to detect the 3-D edge profile of a master model. In automatic experiments, first the characteristic area which may include the edge is extracted by rough measurement, second the measuring path of the sensor adapted to the edge profile is decided in the characteristic area. Finally, the edge positions are detected by using the cross correlation coefficients obtained by fine measurement along the measuring path and the 3-D edge profiles are estimated.
公益社団法人精密工学会の論文
2001-06-05