计算机X射线激光扫描仪设计及分析

针对X射线工业检测,设计了一种适合于计算机X射线扫描仪的新型激光扫描系统.用五角棱镜和聚焦物镜组成扫描臂以取代,Fθ镜头,利用影像板的柔性成圆弧形进片.同时扫描臂又用做接收器件来收集激发出的荧光,使系统性能提高,结构简单.根据进片方案,确定了扫描仪的系统控制方法,给出了控制过程时序图.计算了当五角棱镜存在安置误差时,对系统分辨率的影响,表明了设计的激光扫描系统具有一定的容差性和实用性.用实验验证了所设计制造的扫描仪的性能,结果显示图像具有良好的视觉效果,能够满足工业检测要求.

Design and Analysis of Laser Scanner for Computed Radiography

To meet the requirements of a Computed Radiography (CR) and to implement its functions, a new high-performance laser scanning system was designed. A scanning ann was designed which was composed with pentagonal prism and scanning object lens. Scanning arm is used to replace the Fθ lens. To cooperate with scanning arm, a circular imaging plate transport mechanism was designed. Scanning arm can receive stimulation luminescence as a receiving device, too. The system designed by this method has simple structure and good performance. Besides, the control scheme was introduced and timing sequence diagram of control system was given. The Influence of pentagonal prism's displacement errors on system's resolution was calculated. The calculation results show that this system is easily adaptive to the error. Experiments were carried out to verify the performance of laser scanner. Moreover, the results indicate that the images have good visual effect and can meet requirements of industrial inspection.