基于多周循环步进式插值扫描轨迹的工业CT柔性检测技术研究

为了在一次CT检测过程中同时实现被检工件的精细检测与内部缺陷快速发现的两种检测需求，提出了一种新型CT检测方案。该方案将一种改进的圆形CT投影扫描轨迹与不完全投影插值算法有效融合，实现了投影采集与最优图像实时重建的同步进行。为验证该技术的可行性，设计了相应的扇束CT仿真平台及试验模体，仿真试验结果表明，该检测技术在CT扫描过程中可及时发现被检工件的内部缺陷，扫描结束后可获得工件的精细CT图像，有效满足了工业CT用户在多种检测目的之间自由切换的柔性检测需求。

Study on Industrial CT Flexible Inspection Technique Based on Multi-cycle Step Interpolation Scan Trajectory

In order to achieve two inspection requirements which are high-precision inspection and the rapid inspection of internal defect of the workpiece in a process of CT inspection, a new CT detection scheme was proposed. In this scheme, an improved circular CT projection scan trajectory was combined with the incomplete projection interpolation algorithm to realize the synchronization between the projection acquisition and the real time optimal image reconstruction. In order to verify the feasibility of the technology, the corresponding fan beam CT simulation platform and test model were designed. The simulation results show that the inspection technique can detect the internal defect of the workpiece in the CT scanning process. After the scanning, the fine CT image of the workpiece can be obtained, which can effectively make the industrial CT user in a variety of detection purposes free to switch between the flexible detection needs.