A practical method to calibrate the slant angle of central X-ray for laminography scanning system

被引：12
|
作者：
Yang, Min [1 ]
Zhu, Jianhua [1 ]
Liu, Qiu [1 ]
Duan, Shengling [1 ]
Liang, Lihong [2 ]
Li, Xingdong [3 ]
Liu, Wenli [3 ]
Meng, Fanyong [4 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
[2] China Special Equipment Inspect & Res Inst, Beijing 100013, Peoples R China
[3] Natl Inst Metrol, Beijing 100013, Peoples R China
[4] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
来源：
NDT & E INTERNATIONAL | 2014年 / 64卷
基金：
中国国家自然科学基金;
关键词：
Computed laminography (CL); Geometrical calibration; Slant angle; Ellipse fitting; CONE-BEAM CT; RECONSTRUCTION; PARAMETERS;
D O I：
10.1016/j.ndteint.2014.02.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Computed laminography (CL) has a particular function in plate-type structure tomography. For CL reconstruction, slant angle of the central X-ray is an important parameter and must be calibrated accurately. A practical feasible calibration method to determine the slant angle is proposed. According to this method, a spherical phantom is fixed on the rotary table and turns a full 360 rotation. Then, image processing and the least-square fitting are performed to figure out the locus of the projection. Consequently, the slant angle is achieved in accordance with the property of the fitted ellipse. The experimental results prove that this method is easy to implement and meet the inspection requirements. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：13 / 20
页数：8
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