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

作者：Yang, Min^*; Zhu, Jianhua; Liu, Qiu; Duan, Shengling; Liang, Lihong; Li, Xingdong; Liu, Wenli; Meng, Fanyong

来源：NDT & E International, 2014, 64: 13-20.

DOI：10.1016/j.ndteint.2014.02.004

• Computed laminography (CL)
• Geometrical calibration
• Slant angle
• Ellipse fitting

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.

• 出版日期2014-6
• 单位中国计量科学研究院; 多相复杂系统国家重点实验室; 北京航空航天大学; 中国科学院; 中国特种设备检测研究院