Novel 3D sphericity evaluation based on SFS-NDT

Sphericity evaluation is an important work in modern industry. Because the former 3D measurement is complex and with low precision, a lot of sphericity evaluation is studied only based on 2D measurement. But the 2D sphericity evaluation method is reported unreasonable because sphere is a 3D object. In order to evaluate sphericity error accurately and effectively, based on SFS-NDT 3D measurement method studied in reference [Research on 3D recovery based on only one online measuring image. TianJin University, Doctor thesis (2004)], this paper proposes a novel 3D sphericity evaluation method, which use all the 3D data in the evaluation procedure. Minimum zone solution using all the 3D data is adopted to make the evaluation more accurate and reliable. Compared with the conventional sphericity evaluation based on 2D measurement, the proposed 3D evaluation has the merits of non-contact, non-destructive, low cost, high speed, and high reliable. 3D shape recovery of a sphere based on SFS and its 3D sphericity evaluation procedure will be analyzed in this paper.