抄録
Recently, due to the capability of providing the internal and external geometric information of workpiece simultaneously, X-ray computed tomography (CT) entered the application field of dimensional metrology in industry. However, in this new field the CT technology cannot meet the high accuracy requirements due to many factors. As the cone beam reconstruction algorithm FDK has a severe effect on the CT measurement, this paper proposes a method to analyze the FDK (Feldkamp-Davis-Kress) effect independently form other factors by using the numerical phantoms of a sphere and a cylinder. After the feature and cause of the error are discussed, the method of measurement accuracy improvement is given.
