Design and analysis of laser scanning optical system for computed radiography

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Design and analysis of laser scanning optical system for computed radiography

Article | 更新时间：2020-08-12

- Design and analysis of laser scanning optical system for computed radiography
- Optics and Precision Engineering Vol. 18, Issue 1, Pages: 101-28(2010)
- 作者机构：
  
  北京交通大学理学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TH774;R814.42
- Received：25 March 2009，
  
  Revised：29 April 2009，
  
  Published Online：22 January 2010，
  
  Published：22 January 2010
- 稿件说明：
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郑猛. CR扫描仪激光扫描光学系统的设计[J]. 光学精密工程, 2010,18(1):101-28

Design and analysis of laser scanning optical system for computed radiography[J]. Optics and precision engineering, 2010, 18(1): 101-28.
郑猛. CR扫描仪激光扫描光学系统的设计[J]. 光学精密工程, 2010,18(1):101-28 DOI：

Design and analysis of laser scanning optical system for computed radiography[J]. Optics and precision engineering, 2010, 18(1): 101-28. DOI：

摘要

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。在分析常用扫描结构的基础上，用五角棱镜和聚焦物镜组成扫描臂以取代传统的Fθ镜头，利用成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，使得系统性能提高，结构简单。针对计算机X射线扫描仪的使用性能，利用所设计光学系统，用实验验证了激光光点大小对分辨率的影响。分析了系统中影响激光光点大小的因素，对关键部件扫描臂进行了在高转速条件下的有限元仿真，计算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，对激光光点大小影响。计算显示所设计的激光扫描光学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。

Abstract

To meet the requirements of a Computed Radiography (CR) and to implement its functions

a new high-performance laser scanning optical system was designed. In view of difference in performances of scanning methods

a scanning arm is designed which is composed by 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 is designed. Scanning arm can receive stimulation luminescence as a receiving device too. The system designed by this method has simple structure and good performance. In order to testify the effect of spot size on resolution

an experiment has been performed. Many factors that have effect on the spot size are analyzed in this system. Regarding the influence factors of system

dynamic performance of scanning arm is simulated by using the finite element method in high speed rotating

the influence of incident light out of vertical to incident flat of pentagonal prism and pentagonal prism’s displacement errors to the spot size are calculated. The calculation reveals that the system easily adaptive to the error and can be used widely. Experiments were carried out to verity the performance of laser scanner

the results indicate that the images have good visual effect and can meet requirements of industrial inspection.

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