设计了一种适合于计算机X射线扫描仪的新型激光扫描光学系统,采用五角棱镜和聚焦物镜组成扫描臂以取代传统的f-θ镜头,利用影像板的柔性成圆弧形进片。扫描臂又用做接收器件来收集激发出的荧光,使得系统性能提高,同时结构简单。用Zemax光学软件对扫描物镜的光学性能进行了分析。对机械结构进行了有限元仿真,确定了扫描臂转速。研究了当入射光与五角棱镜入射面不垂直及五角棱镜存在安置误差时,对系统分辨率的影响。结果显示设计的激光扫描光学系统具有一定的容差性。实验验证了所设计制造的扫描仪的性能,扫描图像具有良好的视觉效果,能够满足工业检测要求。

To meet the requirements of computed radiographic (CR) system,a new high-performance laser scanning optical system is designed.In view of differences in performances of scanning methods,a scanning arm which is composed of pentagonal prism and scanning object lens is designed.The scanning arm is used to replace the f-θ lens.To cooperate with scanning arm,a circular imaging plate transport mechanism is designed.The scanning arm also receives stimulation fluorescence as a receiving device.The performance of object lens is analyzed using the Zemax software.The performance of mechanical structure is simulated by using the finite element method and the rotational speed of scanning arm is confirmed.The influences of the following factors that the incident light out of vertial to the pentagonal prism and there is location error of the pentagonal prism on the system′s resolution are studied.The results reveal that the system is easily adaptive to the error and can be used widely.Experiments are carried out to verify the performance of the laser scanner.Moreover,the results indicate that the images have good visual effect and can meet requirements of industrial inspection.